+++ /dev/null
-//========================================================================
-//
-// Stream.cc
-//
-// Copyright 1996-2003 Glyph & Cog, LLC
-//
-//========================================================================
-
-#include <aconf.h>
-
-#ifdef USE_GCC_PRAGMAS
-#pragma implementation
-#endif
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#ifndef WIN32
-#include <unistd.h>
-#endif
-#include <string.h>
-#include <ctype.h>
-#include "gmem.h"
-#include "gfile.h"
-#include "config.h"
-#include "Error.h"
-#include "Object.h"
-#include "Lexer.h"
-#include "Decrypt.h"
-#include "GfxState.h"
-#include "Stream.h"
-#include "JBIG2Stream.h"
-#include "JPXStream.h"
-#include "Stream-CCITT.h"
-
-#ifdef __DJGPP__
-static GBool setDJSYSFLAGS = gFalse;
-#endif
-
-#ifdef VMS
-#ifdef __GNUC__
-#define SEEK_SET 0
-#define SEEK_CUR 1
-#define SEEK_END 2
-#endif
-#endif
-
-//------------------------------------------------------------------------
-// Stream (base class)
-//------------------------------------------------------------------------
-
-Stream::Stream() {
- ref = 1;
-}
-
-Stream::~Stream() {
-}
-
-void Stream::close() {
-}
-
-int Stream::getRawChar() {
- error(-1, "Internal: called getRawChar() on non-predictor stream");
- return EOF;
-}
-
-char *Stream::getLine(char *buf, int size) {
- int i;
- int c;
-
- if (lookChar() == EOF)
- return NULL;
- for (i = 0; i < size - 1; ++i) {
- c = getChar();
- if (c == EOF || c == '\n')
- break;
- if (c == '\r') {
- if ((c = lookChar()) == '\n')
- getChar();
- break;
- }
- buf[i] = c;
- }
- buf[i] = '\0';
- return buf;
-}
-
-GString *Stream::getPSFilter(int psLevel, char *indent) {
- return new GString();
-}
-
-Stream *Stream::addFilters(Object *dict) {
- Object obj, obj2;
- Object params, params2;
- Stream *str;
- int i;
-
- str = this;
- dict->dictLookup("Filter", &obj);
- if (obj.isNull()) {
- obj.free();
- dict->dictLookup("F", &obj);
- }
- dict->dictLookup("DecodeParms", ¶ms);
- if (params.isNull()) {
- params.free();
- dict->dictLookup("DP", ¶ms);
- }
- if (obj.isName()) {
- str = makeFilter(obj.getName(), str, ¶ms);
- } else if (obj.isArray()) {
- for (i = 0; i < obj.arrayGetLength(); ++i) {
- obj.arrayGet(i, &obj2);
- if (params.isArray())
- params.arrayGet(i, ¶ms2);
- else
- params2.initNull();
- if (obj2.isName()) {
- str = makeFilter(obj2.getName(), str, ¶ms2);
- } else {
- error(getPos(), "Bad filter name");
- str = new EOFStream(str);
- }
- obj2.free();
- params2.free();
- }
- } else if (!obj.isNull()) {
- error(getPos(), "Bad 'Filter' attribute in stream");
- }
- obj.free();
- params.free();
-
- return str;
-}
-
-Stream *Stream::makeFilter(char *name, Stream *str, Object *params) {
- int pred; // parameters
- int colors;
- int bits;
- int early;
- int encoding;
- GBool endOfLine, byteAlign, endOfBlock, black;
- int columns, rows;
- Object globals, obj;
-
- if (!strcmp(name, "ASCIIHexDecode") || !strcmp(name, "AHx")) {
- str = new ASCIIHexStream(str);
- } else if (!strcmp(name, "ASCII85Decode") || !strcmp(name, "A85")) {
- str = new ASCII85Stream(str);
- } else if (!strcmp(name, "LZWDecode") || !strcmp(name, "LZW")) {
- pred = 1;
- columns = 1;
- colors = 1;
- bits = 8;
- early = 1;
- if (params->isDict()) {
- params->dictLookup("Predictor", &obj);
- if (obj.isInt())
- pred = obj.getInt();
- obj.free();
- params->dictLookup("Columns", &obj);
- if (obj.isInt())
- columns = obj.getInt();
- obj.free();
- params->dictLookup("Colors", &obj);
- if (obj.isInt())
- colors = obj.getInt();
- obj.free();
- params->dictLookup("BitsPerComponent", &obj);
- if (obj.isInt())
- bits = obj.getInt();
- obj.free();
- params->dictLookup("EarlyChange", &obj);
- if (obj.isInt())
- early = obj.getInt();
- obj.free();
- }
- str = new LZWStream(str, pred, columns, colors, bits, early);
- } else if (!strcmp(name, "RunLengthDecode") || !strcmp(name, "RL")) {
- str = new RunLengthStream(str);
- } else if (!strcmp(name, "CCITTFaxDecode") || !strcmp(name, "CCF")) {
- encoding = 0;
- endOfLine = gFalse;
- byteAlign = gFalse;
- columns = 1728;
- rows = 0;
- endOfBlock = gTrue;
- black = gFalse;
- if (params->isDict()) {
- params->dictLookup("K", &obj);
- if (obj.isInt()) {
- encoding = obj.getInt();
- }
- obj.free();
- params->dictLookup("EndOfLine", &obj);
- if (obj.isBool()) {
- endOfLine = obj.getBool();
- }
- obj.free();
- params->dictLookup("EncodedByteAlign", &obj);
- if (obj.isBool()) {
- byteAlign = obj.getBool();
- }
- obj.free();
- params->dictLookup("Columns", &obj);
- if (obj.isInt()) {
- columns = obj.getInt();
- }
- obj.free();
- params->dictLookup("Rows", &obj);
- if (obj.isInt()) {
- rows = obj.getInt();
- }
- obj.free();
- params->dictLookup("EndOfBlock", &obj);
- if (obj.isBool()) {
- endOfBlock = obj.getBool();
- }
- obj.free();
- params->dictLookup("BlackIs1", &obj);
- if (obj.isBool()) {
- black = obj.getBool();
- }
- obj.free();
- }
- str = new CCITTFaxStream(str, encoding, endOfLine, byteAlign,
- columns, rows, endOfBlock, black);
- } else if (!strcmp(name, "DCTDecode") || !strcmp(name, "DCT")) {
- str = new DCTStream(str);
- } else if (!strcmp(name, "FlateDecode") || !strcmp(name, "Fl")) {
- pred = 1;
- columns = 1;
- colors = 1;
- bits = 8;
- if (params->isDict()) {
- params->dictLookup("Predictor", &obj);
- if (obj.isInt())
- pred = obj.getInt();
- obj.free();
- params->dictLookup("Columns", &obj);
- if (obj.isInt())
- columns = obj.getInt();
- obj.free();
- params->dictLookup("Colors", &obj);
- if (obj.isInt())
- colors = obj.getInt();
- obj.free();
- params->dictLookup("BitsPerComponent", &obj);
- if (obj.isInt())
- bits = obj.getInt();
- obj.free();
- }
- str = new FlateStream(str, pred, columns, colors, bits);
- } else if (!strcmp(name, "JBIG2Decode")) {
- if (params->isDict()) {
- params->dictLookup("JBIG2Globals", &globals);
- }
- str = new JBIG2Stream(str, &globals);
- globals.free();
- } else if (!strcmp(name, "JPXDecode")) {
- str = new JPXStream(str);
- } else {
- error(getPos(), "Unknown filter '%s'", name);
- str = new EOFStream(str);
- }
- return str;
-}
-
-//------------------------------------------------------------------------
-// BaseStream
-//------------------------------------------------------------------------
-
-BaseStream::BaseStream(Object *dictA) {
- dict = *dictA;
- decrypt = NULL;
-}
-
-BaseStream::~BaseStream() {
- dict.free();
- if (decrypt)
- delete decrypt;
-}
-
-void BaseStream::doDecryption(Guchar *fileKey, int keyLength,
- int objNum, int objGen) {
- decrypt = new Decrypt(fileKey, keyLength, objNum, objGen);
-}
-
-//------------------------------------------------------------------------
-// FilterStream
-//------------------------------------------------------------------------
-
-FilterStream::FilterStream(Stream *strA) {
- str = strA;
-}
-
-FilterStream::~FilterStream() {
-}
-
-void FilterStream::close() {
- str->close();
-}
-
-void FilterStream::setPos(Guint pos, int dir) {
- error(-1, "Internal: called setPos() on FilterStream");
-}
-
-//------------------------------------------------------------------------
-// ImageStream
-//------------------------------------------------------------------------
-
-ImageStream::ImageStream(Stream *strA, int widthA, int nCompsA, int nBitsA) {
- int imgLineSize;
-
- str = strA;
- width = widthA;
- nComps = nCompsA;
- nBits = nBitsA;
-
- nVals = width * nComps;
- if (nBits == 1) {
- imgLineSize = (nVals + 7) & ~7;
- } else {
- imgLineSize = nVals;
- }
- imgLine = (Guchar *)gmallocn(imgLineSize, sizeof(Guchar));
- imgIdx = nVals;
-}
-
-ImageStream::~ImageStream() {
- gfree(imgLine);
-}
-
-void ImageStream::reset() {
- str->reset();
-}
-
-GBool ImageStream::getPixel(Guchar *pix) {
- int i;
-
- if (imgIdx >= nVals) {
- getLine();
- imgIdx = 0;
- }
- for (i = 0; i < nComps; ++i) {
- pix[i] = imgLine[imgIdx++];
- }
- return gTrue;
-}
-
-Guchar *ImageStream::getLine() {
- Gulong buf, bitMask;
- int bits;
- int c;
- int i;
-
- if (nBits == 1) {
- for (i = 0; i < nVals; i += 8) {
- c = str->getChar();
- imgLine[i+0] = (Guchar)((c >> 7) & 1);
- imgLine[i+1] = (Guchar)((c >> 6) & 1);
- imgLine[i+2] = (Guchar)((c >> 5) & 1);
- imgLine[i+3] = (Guchar)((c >> 4) & 1);
- imgLine[i+4] = (Guchar)((c >> 3) & 1);
- imgLine[i+5] = (Guchar)((c >> 2) & 1);
- imgLine[i+6] = (Guchar)((c >> 1) & 1);
- imgLine[i+7] = (Guchar)(c & 1);
- }
- } else if (nBits == 8) {
- for (i = 0; i < nVals; ++i) {
- imgLine[i] = str->getChar();
- }
- } else {
- bitMask = (1 << nBits) - 1;
- buf = 0;
- bits = 0;
- for (i = 0; i < nVals; ++i) {
- if (bits < nBits) {
- buf = (buf << 8) | (str->getChar() & 0xff);
- bits += 8;
- }
- imgLine[i] = (Guchar)((buf >> (bits - nBits)) & bitMask);
- bits -= nBits;
- }
- }
- return imgLine;
-}
-
-void ImageStream::skipLine() {
- int n, i;
-
- n = (nVals * nBits + 7) >> 3;
- for (i = 0; i < n; ++i) {
- str->getChar();
- }
-}
-
-//------------------------------------------------------------------------
-// StreamPredictor
-//------------------------------------------------------------------------
-
-StreamPredictor::StreamPredictor(Stream *strA, int predictorA,
- int widthA, int nCompsA, int nBitsA) {
- int totalBits;
-
- str = strA;
- predictor = predictorA;
- width = widthA;
- nComps = nCompsA;
- nBits = nBitsA;
- predLine = NULL;
- ok = gFalse;
-
- nVals = width * nComps;
- totalBits = nVals * nBits;
- if (totalBits == 0 ||
- (totalBits / nBits) / nComps != width ||
- totalBits + 7 < 0) {
- return;
- }
- pixBytes = (nComps * nBits + 7) >> 3;
- rowBytes = ((totalBits + 7) >> 3) + pixBytes;
- if (rowBytes < 0) {
- return;
- }
- predLine = (Guchar *)gmalloc(rowBytes);
- memset(predLine, 0, rowBytes);
- predIdx = rowBytes;
-
- ok = gTrue;
-}
-
-StreamPredictor::~StreamPredictor() {
- gfree(predLine);
-}
-
-int StreamPredictor::lookChar() {
- if (predIdx >= rowBytes) {
- if (!getNextLine()) {
- return EOF;
- }
- }
- return predLine[predIdx];
-}
-
-int StreamPredictor::getChar() {
- if (predIdx >= rowBytes) {
- if (!getNextLine()) {
- return EOF;
- }
- }
- return predLine[predIdx++];
-}
-
-GBool StreamPredictor::getNextLine() {
- int curPred;
- Guchar upLeftBuf[gfxColorMaxComps * 2 + 1];
- int left, up, upLeft, p, pa, pb, pc;
- int c;
- Gulong inBuf, outBuf, bitMask;
- int inBits, outBits;
- int i, j, k, kk;
-
- // get PNG optimum predictor number
- if (predictor >= 10) {
- if ((curPred = str->getRawChar()) == EOF) {
- return gFalse;
- }
- curPred += 10;
- } else {
- curPred = predictor;
- }
-
- // read the raw line, apply PNG (byte) predictor
- memset(upLeftBuf, 0, pixBytes + 1);
- for (i = pixBytes; i < rowBytes; ++i) {
- for (j = pixBytes; j > 0; --j) {
- upLeftBuf[j] = upLeftBuf[j-1];
- }
- upLeftBuf[0] = predLine[i];
- if ((c = str->getRawChar()) == EOF) {
- if (i > pixBytes) {
- // this ought to return false, but some (broken) PDF files
- // contain truncated image data, and Adobe apparently reads the
- // last partial line
- break;
- }
- return gFalse;
- }
- switch (curPred) {
- case 11: // PNG sub
- predLine[i] = predLine[i - pixBytes] + (Guchar)c;
- break;
- case 12: // PNG up
- predLine[i] = predLine[i] + (Guchar)c;
- break;
- case 13: // PNG average
- predLine[i] = ((predLine[i - pixBytes] + predLine[i]) >> 1) +
- (Guchar)c;
- break;
- case 14: // PNG Paeth
- left = predLine[i - pixBytes];
- up = predLine[i];
- upLeft = upLeftBuf[pixBytes];
- p = left + up - upLeft;
- if ((pa = p - left) < 0)
- pa = -pa;
- if ((pb = p - up) < 0)
- pb = -pb;
- if ((pc = p - upLeft) < 0)
- pc = -pc;
- if (pa <= pb && pa <= pc)
- predLine[i] = left + (Guchar)c;
- else if (pb <= pc)
- predLine[i] = up + (Guchar)c;
- else
- predLine[i] = upLeft + (Guchar)c;
- break;
- case 10: // PNG none
- default: // no predictor or TIFF predictor
- predLine[i] = (Guchar)c;
- break;
- }
- }
-
- // apply TIFF (component) predictor
- if (predictor == 2) {
- if (nBits == 1) {
- inBuf = predLine[pixBytes - 1];
- for (i = pixBytes; i < rowBytes; i += 8) {
- // 1-bit add is just xor
- inBuf = (inBuf << 8) | predLine[i];
- predLine[i] ^= inBuf >> nComps;
- }
- } else if (nBits == 8) {
- for (i = pixBytes; i < rowBytes; ++i) {
- predLine[i] += predLine[i - nComps];
- }
- } else {
- memset(upLeftBuf, 0, nComps + 1);
- bitMask = (1 << nBits) - 1;
- inBuf = outBuf = 0;
- inBits = outBits = 0;
- j = k = pixBytes;
- for (i = 0; i < width; ++i) {
- for (kk = 0; kk < nComps; ++kk) {
- if (inBits < nBits) {
- inBuf = (inBuf << 8) | (predLine[j++] & 0xff);
- inBits += 8;
- }
- upLeftBuf[kk] = (upLeftBuf[kk] +
- (inBuf >> (inBits - nBits))) & bitMask;
- inBits -= nBits;
- outBuf = (outBuf << nBits) | upLeftBuf[kk];
- outBits += nBits;
- if (outBits >= 8) {
- predLine[k++] = (Guchar)(outBuf >> (outBits - 8));
- outBits -= 8;
- }
- }
- }
- if (outBits > 0) {
- predLine[k++] = (Guchar)((outBuf << (8 - outBits)) +
- (inBuf & ((1 << (8 - outBits)) - 1)));
- }
- }
- }
-
- // reset to start of line
- predIdx = pixBytes;
-
- return gTrue;
-}
-
-//------------------------------------------------------------------------
-// FileStream
-//------------------------------------------------------------------------
-
-FileStream::FileStream(FILE *fA, Guint startA, GBool limitedA,
- Guint lengthA, Object *dictA):
- BaseStream(dictA) {
- f = fA;
- start = startA;
- limited = limitedA;
- length = lengthA;
- bufPtr = bufEnd = buf;
- bufPos = start;
- savePos = 0;
- saved = gFalse;
-}
-
-FileStream::~FileStream() {
- close();
-}
-
-Stream *FileStream::makeSubStream(Guint startA, GBool limitedA,
- Guint lengthA, Object *dictA) {
- return new FileStream(f, startA, limitedA, lengthA, dictA);
-}
-
-void FileStream::reset() {
-#if HAVE_FSEEKO
- savePos = (Guint)ftello(f);
- fseeko(f, start, SEEK_SET);
-#elif HAVE_FSEEK64
- savePos = (Guint)ftell64(f);
- fseek64(f, start, SEEK_SET);
-#else
- savePos = (Guint)ftell(f);
- fseek(f, start, SEEK_SET);
-#endif
- saved = gTrue;
- bufPtr = bufEnd = buf;
- bufPos = start;
- if (decrypt)
- decrypt->reset();
-}
-
-void FileStream::close() {
- if (saved) {
-#if HAVE_FSEEKO
- fseeko(f, savePos, SEEK_SET);
-#elif HAVE_FSEEK64
- fseek64(f, savePos, SEEK_SET);
-#else
- fseek(f, savePos, SEEK_SET);
-#endif
- saved = gFalse;
- }
-}
-
-GBool FileStream::fillBuf() {
- int n;
- char *p;
-
- bufPos += bufEnd - buf;
- bufPtr = bufEnd = buf;
- if (limited && bufPos >= start + length) {
- return gFalse;
- }
- if (limited && bufPos + fileStreamBufSize > start + length) {
- n = start + length - bufPos;
- } else {
- n = fileStreamBufSize;
- }
- n = fread(buf, 1, n, f);
- bufEnd = buf + n;
- if (bufPtr >= bufEnd) {
- return gFalse;
- }
- if (decrypt) {
- for (p = buf; p < bufEnd; ++p) {
- *p = (char)decrypt->decryptByte((Guchar)*p);
- }
- }
- return gTrue;
-}
-
-void FileStream::setPos(Guint pos, int dir) {
- Guint size;
-
- if (dir >= 0) {
-#if HAVE_FSEEKO
- fseeko(f, pos, SEEK_SET);
-#elif HAVE_FSEEK64
- fseek64(f, pos, SEEK_SET);
-#else
- fseek(f, pos, SEEK_SET);
-#endif
- bufPos = pos;
- } else {
-#if HAVE_FSEEKO
- fseeko(f, 0, SEEK_END);
- size = (Guint)ftello(f);
-#elif HAVE_FSEEK64
- fseek64(f, 0, SEEK_END);
- size = (Guint)ftell64(f);
-#else
- fseek(f, 0, SEEK_END);
- size = (Guint)ftell(f);
-#endif
- if (pos > size)
- pos = (Guint)size;
-#ifdef __CYGWIN32__
- //~ work around a bug in cygwin's implementation of fseek
- rewind(f);
-#endif
-#if HAVE_FSEEKO
- fseeko(f, -(int)pos, SEEK_END);
- bufPos = (Guint)ftello(f);
-#elif HAVE_FSEEK64
- fseek64(f, -(int)pos, SEEK_END);
- bufPos = (Guint)ftell64(f);
-#else
- fseek(f, -(int)pos, SEEK_END);
- bufPos = (Guint)ftell(f);
-#endif
- }
- bufPtr = bufEnd = buf;
-}
-
-void FileStream::moveStart(int delta) {
- start += delta;
- bufPtr = bufEnd = buf;
- bufPos = start;
-}
-
-//------------------------------------------------------------------------
-// MemStream
-//------------------------------------------------------------------------
-
-MemStream::MemStream(char *bufA, Guint startA, Guint lengthA, Object *dictA):
- BaseStream(dictA) {
- buf = bufA;
- start = startA;
- length = lengthA;
- bufEnd = buf + start + length;
- bufPtr = buf + start;
- needFree = gFalse;
-}
-
-MemStream::~MemStream() {
- if (needFree) {
- gfree(buf);
- }
-}
-
-Stream *MemStream::makeSubStream(Guint startA, GBool limited,
- Guint lengthA, Object *dictA) {
- MemStream *subStr;
- Guint newLength;
-
- if (!limited || startA + lengthA > start + length) {
- newLength = start + length - startA;
- } else {
- newLength = lengthA;
- }
- subStr = new MemStream(buf, startA, newLength, dictA);
- return subStr;
-}
-
-void MemStream::reset() {
- bufPtr = buf + start;
- if (decrypt) {
- decrypt->reset();
- }
-}
-
-void MemStream::close() {
-}
-
-void MemStream::setPos(Guint pos, int dir) {
- Guint i;
-
- if (dir >= 0) {
- i = pos;
- } else {
- i = start + length - pos;
- }
- if (i < start) {
- i = start;
- } else if (i > start + length) {
- i = start + length;
- }
- bufPtr = buf + i;
-}
-
-void MemStream::moveStart(int delta) {
- start += delta;
- length -= delta;
- bufPtr = buf + start;
-}
-
-void MemStream::doDecryption(Guchar *fileKey, int keyLength,
- int objNum, int objGen) {
- char *newBuf;
- char *p, *q;
-
- this->BaseStream::doDecryption(fileKey, keyLength, objNum, objGen);
- if (decrypt) {
- newBuf = (char *)gmalloc(length);
- for (p = buf + start, q = newBuf; p < bufEnd; ++p, ++q) {
- *q = (char)decrypt->decryptByte((Guchar)*p);
- }
- bufEnd = newBuf + length;
- bufPtr = newBuf + (bufPtr - (buf + start));
- start = 0;
- buf = newBuf;
- needFree = gTrue;
- }
-}
-
-//------------------------------------------------------------------------
-// EmbedStream
-//------------------------------------------------------------------------
-
-EmbedStream::EmbedStream(Stream *strA, Object *dictA,
- GBool limitedA, Guint lengthA):
- BaseStream(dictA) {
- str = strA;
- limited = limitedA;
- length = lengthA;
-}
-
-EmbedStream::~EmbedStream() {
-}
-
-Stream *EmbedStream::makeSubStream(Guint start, GBool limitedA,
- Guint lengthA, Object *dictA) {
- error(-1, "Internal: called makeSubStream() on EmbedStream");
- return NULL;
-}
-
-int EmbedStream::getChar() {
- if (limited && !length) {
- return EOF;
- }
- --length;
- return str->getChar();
-}
-
-int EmbedStream::lookChar() {
- if (limited && !length) {
- return EOF;
- }
- return str->lookChar();
-}
-
-void EmbedStream::setPos(Guint pos, int dir) {
- error(-1, "Internal: called setPos() on EmbedStream");
-}
-
-Guint EmbedStream::getStart() {
- error(-1, "Internal: called getStart() on EmbedStream");
- return 0;
-}
-
-void EmbedStream::moveStart(int delta) {
- error(-1, "Internal: called moveStart() on EmbedStream");
-}
-
-//------------------------------------------------------------------------
-// ASCIIHexStream
-//------------------------------------------------------------------------
-
-ASCIIHexStream::ASCIIHexStream(Stream *strA):
- FilterStream(strA) {
- buf = EOF;
- eof = gFalse;
-}
-
-ASCIIHexStream::~ASCIIHexStream() {
- delete str;
-}
-
-void ASCIIHexStream::reset() {
- str->reset();
- buf = EOF;
- eof = gFalse;
-}
-
-int ASCIIHexStream::lookChar() {
- int c1, c2, x;
-
- if (buf != EOF)
- return buf;
- if (eof) {
- buf = EOF;
- return EOF;
- }
- do {
- c1 = str->getChar();
- } while (isspace(c1));
- if (c1 == '>') {
- eof = gTrue;
- buf = EOF;
- return buf;
- }
- do {
- c2 = str->getChar();
- } while (isspace(c2));
- if (c2 == '>') {
- eof = gTrue;
- c2 = '0';
- }
- if (c1 >= '0' && c1 <= '9') {
- x = (c1 - '0') << 4;
- } else if (c1 >= 'A' && c1 <= 'F') {
- x = (c1 - 'A' + 10) << 4;
- } else if (c1 >= 'a' && c1 <= 'f') {
- x = (c1 - 'a' + 10) << 4;
- } else if (c1 == EOF) {
- eof = gTrue;
- x = 0;
- } else {
- error(getPos(), "Illegal character <%02x> in ASCIIHex stream", c1);
- x = 0;
- }
- if (c2 >= '0' && c2 <= '9') {
- x += c2 - '0';
- } else if (c2 >= 'A' && c2 <= 'F') {
- x += c2 - 'A' + 10;
- } else if (c2 >= 'a' && c2 <= 'f') {
- x += c2 - 'a' + 10;
- } else if (c2 == EOF) {
- eof = gTrue;
- x = 0;
- } else {
- error(getPos(), "Illegal character <%02x> in ASCIIHex stream", c2);
- }
- buf = x & 0xff;
- return buf;
-}
-
-GString *ASCIIHexStream::getPSFilter(int psLevel, char *indent) {
- GString *s;
-
- if (psLevel < 2) {
- return NULL;
- }
- if (!(s = str->getPSFilter(psLevel, indent))) {
- return NULL;
- }
- s->append(indent)->append("/ASCIIHexDecode filter\n");
- return s;
-}
-
-GBool ASCIIHexStream::isBinary(GBool last) {
- return str->isBinary(gFalse);
-}
-
-//------------------------------------------------------------------------
-// ASCII85Stream
-//------------------------------------------------------------------------
-
-ASCII85Stream::ASCII85Stream(Stream *strA):
- FilterStream(strA) {
- index = n = 0;
- eof = gFalse;
-}
-
-ASCII85Stream::~ASCII85Stream() {
- delete str;
-}
-
-void ASCII85Stream::reset() {
- str->reset();
- index = n = 0;
- eof = gFalse;
-}
-
-int ASCII85Stream::lookChar() {
- int k;
- Gulong t;
-
- if (index >= n) {
- if (eof)
- return EOF;
- index = 0;
- do {
- c[0] = str->getChar();
- } while (Lexer::isSpace(c[0]));
- if (c[0] == '~' || c[0] == EOF) {
- eof = gTrue;
- n = 0;
- return EOF;
- } else if (c[0] == 'z') {
- b[0] = b[1] = b[2] = b[3] = 0;
- n = 4;
- } else {
- for (k = 1; k < 5; ++k) {
- do {
- c[k] = str->getChar();
- } while (Lexer::isSpace(c[k]));
- if (c[k] == '~' || c[k] == EOF)
- break;
- }
- n = k - 1;
- if (k < 5 && (c[k] == '~' || c[k] == EOF)) {
- for (++k; k < 5; ++k)
- c[k] = 0x21 + 84;
- eof = gTrue;
- }
- t = 0;
- for (k = 0; k < 5; ++k)
- t = t * 85 + (c[k] - 0x21);
- for (k = 3; k >= 0; --k) {
- b[k] = (int)(t & 0xff);
- t >>= 8;
- }
- }
- }
- return b[index];
-}
-
-GString *ASCII85Stream::getPSFilter(int psLevel, char *indent) {
- GString *s;
-
- if (psLevel < 2) {
- return NULL;
- }
- if (!(s = str->getPSFilter(psLevel, indent))) {
- return NULL;
- }
- s->append(indent)->append("/ASCII85Decode filter\n");
- return s;
-}
-
-GBool ASCII85Stream::isBinary(GBool last) {
- return str->isBinary(gFalse);
-}
-
-//------------------------------------------------------------------------
-// LZWStream
-//------------------------------------------------------------------------
-
-LZWStream::LZWStream(Stream *strA, int predictor, int columns, int colors,
- int bits, int earlyA):
- FilterStream(strA) {
- if (predictor != 1) {
- pred = new StreamPredictor(this, predictor, columns, colors, bits);
- if (!pred->isOk()) {
- delete pred;
- pred = NULL;
- }
- } else {
- pred = NULL;
- }
- early = earlyA;
- eof = gFalse;
- inputBits = 0;
- clearTable();
-}
-
-LZWStream::~LZWStream() {
- if (pred) {
- delete pred;
- }
- delete str;
-}
-
-int LZWStream::getChar() {
- if (pred) {
- return pred->getChar();
- }
- if (eof) {
- return EOF;
- }
- if (seqIndex >= seqLength) {
- if (!processNextCode()) {
- return EOF;
- }
- }
- return seqBuf[seqIndex++];
-}
-
-int LZWStream::lookChar() {
- if (pred) {
- return pred->lookChar();
- }
- if (eof) {
- return EOF;
- }
- if (seqIndex >= seqLength) {
- if (!processNextCode()) {
- return EOF;
- }
- }
- return seqBuf[seqIndex];
-}
-
-int LZWStream::getRawChar() {
- if (eof) {
- return EOF;
- }
- if (seqIndex >= seqLength) {
- if (!processNextCode()) {
- return EOF;
- }
- }
- return seqBuf[seqIndex++];
-}
-
-void LZWStream::reset() {
- str->reset();
- eof = gFalse;
- inputBits = 0;
- clearTable();
-}
-
-GBool LZWStream::processNextCode() {
- int code;
- int nextLength;
- int i, j;
-
- // check for EOF
- if (eof) {
- return gFalse;
- }
-
- // check for eod and clear-table codes
- start:
- code = getCode();
- if (code == EOF || code == 257) {
- eof = gTrue;
- return gFalse;
- }
- if (code == 256) {
- clearTable();
- goto start;
- }
- if (nextCode >= 4097) {
- error(getPos(), "Bad LZW stream - expected clear-table code");
- clearTable();
- }
-
- // process the next code
- nextLength = seqLength + 1;
- if (code < 256) {
- seqBuf[0] = code;
- seqLength = 1;
- } else if (code < nextCode) {
- seqLength = table[code].length;
- for (i = seqLength - 1, j = code; i > 0; --i) {
- seqBuf[i] = table[j].tail;
- j = table[j].head;
- }
- seqBuf[0] = j;
- } else if (code == nextCode) {
- seqBuf[seqLength] = newChar;
- ++seqLength;
- } else {
- error(getPos(), "Bad LZW stream - unexpected code");
- eof = gTrue;
- return gFalse;
- }
- newChar = seqBuf[0];
- if (first) {
- first = gFalse;
- } else {
- table[nextCode].length = nextLength;
- table[nextCode].head = prevCode;
- table[nextCode].tail = newChar;
- ++nextCode;
- if (nextCode + early == 512)
- nextBits = 10;
- else if (nextCode + early == 1024)
- nextBits = 11;
- else if (nextCode + early == 2048)
- nextBits = 12;
- }
- prevCode = code;
-
- // reset buffer
- seqIndex = 0;
-
- return gTrue;
-}
-
-void LZWStream::clearTable() {
- nextCode = 258;
- nextBits = 9;
- seqIndex = seqLength = 0;
- first = gTrue;
-}
-
-int LZWStream::getCode() {
- int c;
- int code;
-
- while (inputBits < nextBits) {
- if ((c = str->getChar()) == EOF)
- return EOF;
- inputBuf = (inputBuf << 8) | (c & 0xff);
- inputBits += 8;
- }
- code = (inputBuf >> (inputBits - nextBits)) & ((1 << nextBits) - 1);
- inputBits -= nextBits;
- return code;
-}
-
-GString *LZWStream::getPSFilter(int psLevel, char *indent) {
- GString *s;
-
- if (psLevel < 2 || pred) {
- return NULL;
- }
- if (!(s = str->getPSFilter(psLevel, indent))) {
- return NULL;
- }
- s->append(indent)->append("<< ");
- if (!early) {
- s->append("/EarlyChange 0 ");
- }
- s->append(">> /LZWDecode filter\n");
- return s;
-}
-
-GBool LZWStream::isBinary(GBool last) {
- return str->isBinary(gTrue);
-}
-
-//------------------------------------------------------------------------
-// RunLengthStream
-//------------------------------------------------------------------------
-
-RunLengthStream::RunLengthStream(Stream *strA):
- FilterStream(strA) {
- bufPtr = bufEnd = buf;
- eof = gFalse;
-}
-
-RunLengthStream::~RunLengthStream() {
- delete str;
-}
-
-void RunLengthStream::reset() {
- str->reset();
- bufPtr = bufEnd = buf;
- eof = gFalse;
-}
-
-GString *RunLengthStream::getPSFilter(int psLevel, char *indent) {
- GString *s;
-
- if (psLevel < 2) {
- return NULL;
- }
- if (!(s = str->getPSFilter(psLevel, indent))) {
- return NULL;
- }
- s->append(indent)->append("/RunLengthDecode filter\n");
- return s;
-}
-
-GBool RunLengthStream::isBinary(GBool last) {
- return str->isBinary(gTrue);
-}
-
-GBool RunLengthStream::fillBuf() {
- int c;
- int n, i;
-
- if (eof)
- return gFalse;
- c = str->getChar();
- if (c == 0x80 || c == EOF) {
- eof = gTrue;
- return gFalse;
- }
- if (c < 0x80) {
- n = c + 1;
- for (i = 0; i < n; ++i)
- buf[i] = (char)str->getChar();
- } else {
- n = 0x101 - c;
- c = str->getChar();
- for (i = 0; i < n; ++i)
- buf[i] = (char)c;
- }
- bufPtr = buf;
- bufEnd = buf + n;
- return gTrue;
-}
-
-//------------------------------------------------------------------------
-// CCITTFaxStream
-//------------------------------------------------------------------------
-
-CCITTFaxStream::CCITTFaxStream(Stream *strA, int encodingA, GBool endOfLineA,
- GBool byteAlignA, int columnsA, int rowsA,
- GBool endOfBlockA, GBool blackA):
- FilterStream(strA) {
- encoding = encodingA;
- endOfLine = endOfLineA;
- byteAlign = byteAlignA;
- columns = columnsA;
- if (columns < 1) {
- columns = 1;
- }
- rows = rowsA;
- endOfBlock = endOfBlockA;
- black = blackA;
- refLine = (short *)gmallocn(columns + 4, sizeof(short));
- codingLine = (short *)gmallocn(columns + 3, sizeof(short));
-
- eof = gFalse;
- row = 0;
- nextLine2D = encoding < 0;
- inputBits = 0;
- codingLine[0] = 0;
- codingLine[1] = refLine[2] = columns;
- a0 = 1;
-
- buf = EOF;
-}
-
-CCITTFaxStream::~CCITTFaxStream() {
- delete str;
- gfree(refLine);
- gfree(codingLine);
-}
-
-void CCITTFaxStream::reset() {
- short code1;
-
- str->reset();
- eof = gFalse;
- row = 0;
- nextLine2D = encoding < 0;
- inputBits = 0;
- codingLine[0] = 0;
- codingLine[1] = refLine[2] = columns;
- a0 = 1;
- buf = EOF;
-
- // skip any initial zero bits and end-of-line marker, and get the 2D
- // encoding tag
- while ((code1 = lookBits(12)) == 0) {
- eatBits(1);
- }
- if (code1 == 0x001) {
- eatBits(12);
- }
- if (encoding > 0) {
- nextLine2D = !lookBits(1);
- eatBits(1);
- }
-}
-
-int CCITTFaxStream::lookChar() {
- short code1, code2, code3;
- int a0New;
- GBool err, gotEOL;
- int ret;
- int bits, i;
-
- // if at eof just return EOF
- if (eof && codingLine[a0] >= columns) {
- return EOF;
- }
-
- // read the next row
- err = gFalse;
- if (codingLine[a0] >= columns) {
-
- // 2-D encoding
- if (nextLine2D) {
- for (i = 0; codingLine[i] < columns; ++i)
- refLine[i] = codingLine[i];
- refLine[i] = refLine[i + 1] = columns;
- b1 = 1;
- a0New = codingLine[a0 = 0] = 0;
- do {
- code1 = getTwoDimCode();
- switch (code1) {
- case twoDimPass:
- if (refLine[b1] < columns) {
- a0New = refLine[b1 + 1];
- b1 += 2;
- }
- break;
- case twoDimHoriz:
- if ((a0 & 1) == 0) {
- code1 = code2 = 0;
- do {
- code1 += code3 = getWhiteCode();
- } while (code3 >= 64);
- do {
- code2 += code3 = getBlackCode();
- } while (code3 >= 64);
- } else {
- code1 = code2 = 0;
- do {
- code1 += code3 = getBlackCode();
- } while (code3 >= 64);
- do {
- code2 += code3 = getWhiteCode();
- } while (code3 >= 64);
- }
- if (code1 > 0 || code2 > 0) {
- codingLine[a0 + 1] = a0New + code1;
- ++a0;
- a0New = codingLine[a0 + 1] = codingLine[a0] + code2;
- ++a0;
- while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
- b1 += 2;
- }
- break;
- case twoDimVert0:
- a0New = codingLine[++a0] = refLine[b1];
- if (refLine[b1] < columns) {
- ++b1;
- while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
- b1 += 2;
- }
- break;
- case twoDimVertR1:
- a0New = codingLine[++a0] = refLine[b1] + 1;
- if (refLine[b1] < columns) {
- ++b1;
- while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
- b1 += 2;
- }
- break;
- case twoDimVertL1:
- if (a0 == 0 || refLine[b1] - 1 > a0New) {
- a0New = codingLine[++a0] = refLine[b1] - 1;
- --b1;
- while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
- b1 += 2;
- }
- break;
- case twoDimVertR2:
- a0New = codingLine[++a0] = refLine[b1] + 2;
- if (refLine[b1] < columns) {
- ++b1;
- while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
- b1 += 2;
- }
- break;
- case twoDimVertL2:
- if (a0 == 0 || refLine[b1] - 2 > a0New) {
- a0New = codingLine[++a0] = refLine[b1] - 2;
- --b1;
- while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
- b1 += 2;
- }
- break;
- case twoDimVertR3:
- a0New = codingLine[++a0] = refLine[b1] + 3;
- if (refLine[b1] < columns) {
- ++b1;
- while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
- b1 += 2;
- }
- break;
- case twoDimVertL3:
- if (a0 == 0 || refLine[b1] - 3 > a0New) {
- a0New = codingLine[++a0] = refLine[b1] - 3;
- --b1;
- while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
- b1 += 2;
- }
- break;
- case EOF:
- eof = gTrue;
- codingLine[a0 = 0] = columns;
- return EOF;
- default:
- error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1);
- err = gTrue;
- break;
- }
- } while (codingLine[a0] < columns);
-
- // 1-D encoding
- } else {
- codingLine[a0 = 0] = 0;
- while (1) {
- code1 = 0;
- do {
- code1 += code3 = getWhiteCode();
- } while (code3 >= 64);
- codingLine[a0+1] = codingLine[a0] + code1;
- ++a0;
- if (codingLine[a0] >= columns)
- break;
- code2 = 0;
- do {
- code2 += code3 = getBlackCode();
- } while (code3 >= 64);
- codingLine[a0+1] = codingLine[a0] + code2;
- ++a0;
- if (codingLine[a0] >= columns)
- break;
- }
- }
-
- if (codingLine[a0] != columns) {
- error(getPos(), "CCITTFax row is wrong length (%d)", codingLine[a0]);
- // force the row to be the correct length
- while (codingLine[a0] > columns) {
- --a0;
- }
- codingLine[++a0] = columns;
- err = gTrue;
- }
-
- // byte-align the row
- if (byteAlign) {
- inputBits &= ~7;
- }
-
- // check for end-of-line marker, skipping over any extra zero bits
- gotEOL = gFalse;
- if (!endOfBlock && row == rows - 1) {
- eof = gTrue;
- } else {
- code1 = lookBits(12);
- while (code1 == 0) {
- eatBits(1);
- code1 = lookBits(12);
- }
- if (code1 == 0x001) {
- eatBits(12);
- gotEOL = gTrue;
- } else if (code1 == EOF) {
- eof = gTrue;
- }
- }
-
- // get 2D encoding tag
- if (!eof && encoding > 0) {
- nextLine2D = !lookBits(1);
- eatBits(1);
- }
-
- // check for end-of-block marker
- if (endOfBlock && gotEOL) {
- code1 = lookBits(12);
- if (code1 == 0x001) {
- eatBits(12);
- if (encoding > 0) {
- lookBits(1);
- eatBits(1);
- }
- if (encoding >= 0) {
- for (i = 0; i < 4; ++i) {
- code1 = lookBits(12);
- if (code1 != 0x001) {
- error(getPos(), "Bad RTC code in CCITTFax stream");
- }
- eatBits(12);
- if (encoding > 0) {
- lookBits(1);
- eatBits(1);
- }
- }
- }
- eof = gTrue;
- }
-
- // look for an end-of-line marker after an error -- we only do
- // this if we know the stream contains end-of-line markers because
- // the "just plow on" technique tends to work better otherwise
- } else if (err && endOfLine) {
- do {
- if (code1 == EOF) {
- eof = gTrue;
- return EOF;
- }
- eatBits(1);
- code1 = lookBits(13);
- } while ((code1 >> 1) != 0x001);
- eatBits(12);
- if (encoding > 0) {
- eatBits(1);
- nextLine2D = !(code1 & 1);
- }
- }
-
- a0 = 0;
- outputBits = codingLine[1] - codingLine[0];
- if (outputBits == 0) {
- a0 = 1;
- outputBits = codingLine[2] - codingLine[1];
- }
-
- ++row;
- }
-
- // get a byte
- if (outputBits >= 8) {
- ret = ((a0 & 1) == 0) ? 0xff : 0x00;
- if ((outputBits -= 8) == 0) {
- ++a0;
- if (codingLine[a0] < columns) {
- outputBits = codingLine[a0 + 1] - codingLine[a0];
- }
- }
- } else {
- bits = 8;
- ret = 0;
- do {
- if (outputBits > bits) {
- i = bits;
- bits = 0;
- if ((a0 & 1) == 0) {
- ret |= 0xff >> (8 - i);
- }
- outputBits -= i;
- } else {
- i = outputBits;
- bits -= outputBits;
- if ((a0 & 1) == 0) {
- ret |= (0xff >> (8 - i)) << bits;
- }
- outputBits = 0;
- ++a0;
- if (codingLine[a0] < columns) {
- outputBits = codingLine[a0 + 1] - codingLine[a0];
- }
- }
- } while (bits > 0 && codingLine[a0] < columns);
- }
- buf = black ? (ret ^ 0xff) : ret;
- return buf;
-}
-
-short CCITTFaxStream::getTwoDimCode() {
- short code;
- CCITTCode *p;
- int n;
-
- code = 0; // make gcc happy
- if (endOfBlock) {
- code = lookBits(7);
- p = &twoDimTab1[code];
- if (p->bits > 0) {
- eatBits(p->bits);
- return p->n;
- }
- } else {
- for (n = 1; n <= 7; ++n) {
- code = lookBits(n);
- if (n < 7) {
- code <<= 7 - n;
- }
- p = &twoDimTab1[code];
- if (p->bits == n) {
- eatBits(n);
- return p->n;
- }
- }
- }
- error(getPos(), "Bad two dim code (%04x) in CCITTFax stream", code);
- return EOF;
-}
-
-short CCITTFaxStream::getWhiteCode() {
- short code;
- CCITTCode *p;
- int n;
-
- code = 0; // make gcc happy
- if (endOfBlock) {
- code = lookBits(12);
- if ((code >> 5) == 0) {
- p = &whiteTab1[code];
- } else {
- p = &whiteTab2[code >> 3];
- }
- if (p->bits > 0) {
- eatBits(p->bits);
- return p->n;
- }
- } else {
- for (n = 1; n <= 9; ++n) {
- code = lookBits(n);
- if (n < 9) {
- code <<= 9 - n;
- }
- p = &whiteTab2[code];
- if (p->bits == n) {
- eatBits(n);
- return p->n;
- }
- }
- for (n = 11; n <= 12; ++n) {
- code = lookBits(n);
- if (n < 12) {
- code <<= 12 - n;
- }
- p = &whiteTab1[code];
- if (p->bits == n) {
- eatBits(n);
- return p->n;
- }
- }
- }
- error(getPos(), "Bad white code (%04x) in CCITTFax stream", code);
- // eat a bit and return a positive number so that the caller doesn't
- // go into an infinite loop
- eatBits(1);
- return 1;
-}
-
-short CCITTFaxStream::getBlackCode() {
- short code;
- CCITTCode *p;
- int n;
-
- code = 0; // make gcc happy
- if (endOfBlock) {
- code = lookBits(13);
- if ((code >> 7) == 0) {
- p = &blackTab1[code];
- } else if ((code >> 9) == 0) {
- p = &blackTab2[(code >> 1) - 64];
- } else {
- p = &blackTab3[code >> 7];
- }
- if (p->bits > 0) {
- eatBits(p->bits);
- return p->n;
- }
- } else {
- for (n = 2; n <= 6; ++n) {
- code = lookBits(n);
- if (n < 6) {
- code <<= 6 - n;
- }
- p = &blackTab3[code];
- if (p->bits == n) {
- eatBits(n);
- return p->n;
- }
- }
- for (n = 7; n <= 12; ++n) {
- code = lookBits(n);
- if (n < 12) {
- code <<= 12 - n;
- }
- if (code >= 64) {
- p = &blackTab2[code - 64];
- if (p->bits == n) {
- eatBits(n);
- return p->n;
- }
- }
- }
- for (n = 10; n <= 13; ++n) {
- code = lookBits(n);
- if (n < 13) {
- code <<= 13 - n;
- }
- p = &blackTab1[code];
- if (p->bits == n) {
- eatBits(n);
- return p->n;
- }
- }
- }
- error(getPos(), "Bad black code (%04x) in CCITTFax stream", code);
- // eat a bit and return a positive number so that the caller doesn't
- // go into an infinite loop
- eatBits(1);
- return 1;
-}
-
-short CCITTFaxStream::lookBits(int n) {
- int c;
-
- while (inputBits < n) {
- if ((c = str->getChar()) == EOF) {
- if (inputBits == 0) {
- return EOF;
- }
- // near the end of the stream, the caller may ask for more bits
- // than are available, but there may still be a valid code in
- // however many bits are available -- we need to return correct
- // data in this case
- return (inputBuf << (n - inputBits)) & (0xffff >> (16 - n));
- }
- inputBuf = (inputBuf << 8) + c;
- inputBits += 8;
- }
- return (inputBuf >> (inputBits - n)) & (0xffff >> (16 - n));
-}
-
-GString *CCITTFaxStream::getPSFilter(int psLevel, char *indent) {
- GString *s;
- char s1[50];
-
- if (psLevel < 2) {
- return NULL;
- }
- if (!(s = str->getPSFilter(psLevel, indent))) {
- return NULL;
- }
- s->append(indent)->append("<< ");
- if (encoding != 0) {
- sprintf(s1, "/K %d ", encoding);
- s->append(s1);
- }
- if (endOfLine) {
- s->append("/EndOfLine true ");
- }
- if (byteAlign) {
- s->append("/EncodedByteAlign true ");
- }
- sprintf(s1, "/Columns %d ", columns);
- s->append(s1);
- if (rows != 0) {
- sprintf(s1, "/Rows %d ", rows);
- s->append(s1);
- }
- if (!endOfBlock) {
- s->append("/EndOfBlock false ");
- }
- if (black) {
- s->append("/BlackIs1 true ");
- }
- s->append(">> /CCITTFaxDecode filter\n");
- return s;
-}
-
-GBool CCITTFaxStream::isBinary(GBool last) {
- return str->isBinary(gTrue);
-}
-
-//------------------------------------------------------------------------
-// DCTStream
-//------------------------------------------------------------------------
-
-// IDCT constants (20.12 fixed point format)
-#define dctCos1 4017 // cos(pi/16)
-#define dctSin1 799 // sin(pi/16)
-#define dctCos3 3406 // cos(3*pi/16)
-#define dctSin3 2276 // sin(3*pi/16)
-#define dctCos6 1567 // cos(6*pi/16)
-#define dctSin6 3784 // sin(6*pi/16)
-#define dctSqrt2 5793 // sqrt(2)
-#define dctSqrt1d2 2896 // sqrt(2) / 2
-
-// color conversion parameters (16.16 fixed point format)
-#define dctCrToR 91881 // 1.4020
-#define dctCbToG -22553 // -0.3441363
-#define dctCrToG -46802 // -0.71413636
-#define dctCbToB 116130 // 1.772
-
-// clip [-256,511] --> [0,255]
-#define dctClipOffset 256
-static Guchar dctClip[768];
-static int dctClipInit = 0;
-
-// zig zag decode map
-static int dctZigZag[64] = {
- 0,
- 1, 8,
- 16, 9, 2,
- 3, 10, 17, 24,
- 32, 25, 18, 11, 4,
- 5, 12, 19, 26, 33, 40,
- 48, 41, 34, 27, 20, 13, 6,
- 7, 14, 21, 28, 35, 42, 49, 56,
- 57, 50, 43, 36, 29, 22, 15,
- 23, 30, 37, 44, 51, 58,
- 59, 52, 45, 38, 31,
- 39, 46, 53, 60,
- 61, 54, 47,
- 55, 62,
- 63
-};
-
-DCTStream::DCTStream(Stream *strA):
- FilterStream(strA) {
- int i, j;
-
- progressive = interleaved = gFalse;
- width = height = 0;
- mcuWidth = mcuHeight = 0;
- numComps = 0;
- comp = 0;
- x = y = dy = 0;
- for (i = 0; i < 4; ++i) {
- for (j = 0; j < 32; ++j) {
- rowBuf[i][j] = NULL;
- }
- frameBuf[i] = NULL;
- }
-
- if (!dctClipInit) {
- for (i = -256; i < 0; ++i)
- dctClip[dctClipOffset + i] = 0;
- for (i = 0; i < 256; ++i)
- dctClip[dctClipOffset + i] = i;
- for (i = 256; i < 512; ++i)
- dctClip[dctClipOffset + i] = 255;
- dctClipInit = 1;
- }
-}
-
-DCTStream::~DCTStream() {
- int i, j;
-
- delete str;
- if (progressive || !interleaved) {
- for (i = 0; i < numComps; ++i) {
- gfree(frameBuf[i]);
- }
- } else {
- for (i = 0; i < numComps; ++i) {
- for (j = 0; j < mcuHeight; ++j) {
- gfree(rowBuf[i][j]);
- }
- }
- }
-}
-
-void DCTStream::reset() {
- int i, j;
-
- str->reset();
-
- progressive = interleaved = gFalse;
- width = height = 0;
- numComps = 0;
- numQuantTables = 0;
- numDCHuffTables = 0;
- numACHuffTables = 0;
- colorXform = 0;
- gotJFIFMarker = gFalse;
- gotAdobeMarker = gFalse;
- restartInterval = 0;
-
- if (!readHeader()) {
- y = height;
- return;
- }
-
- // compute MCU size
- if (numComps == 1) {
- compInfo[0].hSample = compInfo[0].vSample = 1;
- }
- mcuWidth = compInfo[0].hSample;
- mcuHeight = compInfo[0].vSample;
- for (i = 1; i < numComps; ++i) {
- if (compInfo[i].hSample > mcuWidth) {
- mcuWidth = compInfo[i].hSample;
- }
- if (compInfo[i].vSample > mcuHeight) {
- mcuHeight = compInfo[i].vSample;
- }
- }
- mcuWidth *= 8;
- mcuHeight *= 8;
-
- // figure out color transform
- if (!gotAdobeMarker && numComps == 3) {
- if (gotJFIFMarker) {
- colorXform = 1;
- } else if (compInfo[0].id == 82 && compInfo[1].id == 71 &&
- compInfo[2].id == 66) { // ASCII "RGB"
- colorXform = 0;
- } else {
- colorXform = 1;
- }
- }
-
- if (progressive || !interleaved) {
-
- // allocate a buffer for the whole image
- bufWidth = ((width + mcuWidth - 1) / mcuWidth) * mcuWidth;
- bufHeight = ((height + mcuHeight - 1) / mcuHeight) * mcuHeight;
- for (i = 0; i < numComps; ++i) {
- frameBuf[i] = (int *)gmallocn(bufWidth * bufHeight, sizeof(int));
- memset(frameBuf[i], 0, bufWidth * bufHeight * sizeof(int));
- }
-
- // read the image data
- do {
- restartMarker = 0xd0;
- restart();
- readScan();
- } while (readHeader());
-
- // decode
- decodeImage();
-
- // initialize counters
- comp = 0;
- x = 0;
- y = 0;
-
- } else {
-
- // allocate a buffer for one row of MCUs
- bufWidth = ((width + mcuWidth - 1) / mcuWidth) * mcuWidth;
- for (i = 0; i < numComps; ++i) {
- for (j = 0; j < mcuHeight; ++j) {
- rowBuf[i][j] = (Guchar *)gmallocn(bufWidth, sizeof(Guchar));
- }
- }
-
- // initialize counters
- comp = 0;
- x = 0;
- y = 0;
- dy = mcuHeight;
-
- restartMarker = 0xd0;
- restart();
- }
-}
-
-int DCTStream::getChar() {
- int c;
-
- if (y >= height) {
- return EOF;
- }
- if (progressive || !interleaved) {
- c = frameBuf[comp][y * bufWidth + x];
- if (++comp == numComps) {
- comp = 0;
- if (++x == width) {
- x = 0;
- ++y;
- }
- }
- } else {
- if (dy >= mcuHeight) {
- if (!readMCURow()) {
- y = height;
- return EOF;
- }
- comp = 0;
- x = 0;
- dy = 0;
- }
- c = rowBuf[comp][dy][x];
- if (++comp == numComps) {
- comp = 0;
- if (++x == width) {
- x = 0;
- ++y;
- ++dy;
- if (y == height) {
- readTrailer();
- }
- }
- }
- }
- return c;
-}
-
-int DCTStream::lookChar() {
- if (y >= height) {
- return EOF;
- }
- if (progressive || !interleaved) {
- return frameBuf[comp][y * bufWidth + x];
- } else {
- if (dy >= mcuHeight) {
- if (!readMCURow()) {
- y = height;
- return EOF;
- }
- comp = 0;
- x = 0;
- dy = 0;
- }
- return rowBuf[comp][dy][x];
- }
-}
-
-void DCTStream::restart() {
- int i;
-
- inputBits = 0;
- restartCtr = restartInterval;
- for (i = 0; i < numComps; ++i) {
- compInfo[i].prevDC = 0;
- }
- eobRun = 0;
-}
-
-// Read one row of MCUs from a sequential JPEG stream.
-GBool DCTStream::readMCURow() {
- int data1[64];
- Guchar data2[64];
- Guchar *p1, *p2;
- int pY, pCb, pCr, pR, pG, pB;
- int h, v, horiz, vert, hSub, vSub;
- int x1, x2, y2, x3, y3, x4, y4, x5, y5, cc, i;
- int c;
-
- for (x1 = 0; x1 < width; x1 += mcuWidth) {
-
- // deal with restart marker
- if (restartInterval > 0 && restartCtr == 0) {
- c = readMarker();
- if (c != restartMarker) {
- error(getPos(), "Bad DCT data: incorrect restart marker");
- return gFalse;
- }
- if (++restartMarker == 0xd8)
- restartMarker = 0xd0;
- restart();
- }
-
- // read one MCU
- for (cc = 0; cc < numComps; ++cc) {
- h = compInfo[cc].hSample;
- v = compInfo[cc].vSample;
- horiz = mcuWidth / h;
- vert = mcuHeight / v;
- hSub = horiz / 8;
- vSub = vert / 8;
- for (y2 = 0; y2 < mcuHeight; y2 += vert) {
- for (x2 = 0; x2 < mcuWidth; x2 += horiz) {
- if (!readDataUnit(&dcHuffTables[scanInfo.dcHuffTable[cc]],
- &acHuffTables[scanInfo.acHuffTable[cc]],
- &compInfo[cc].prevDC,
- data1)) {
- return gFalse;
- }
- transformDataUnit(quantTables[compInfo[cc].quantTable],
- data1, data2);
- if (hSub == 1 && vSub == 1) {
- for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) {
- p1 = &rowBuf[cc][y2+y3][x1+x2];
- p1[0] = data2[i];
- p1[1] = data2[i+1];
- p1[2] = data2[i+2];
- p1[3] = data2[i+3];
- p1[4] = data2[i+4];
- p1[5] = data2[i+5];
- p1[6] = data2[i+6];
- p1[7] = data2[i+7];
- }
- } else if (hSub == 2 && vSub == 2) {
- for (y3 = 0, i = 0; y3 < 16; y3 += 2, i += 8) {
- p1 = &rowBuf[cc][y2+y3][x1+x2];
- p2 = &rowBuf[cc][y2+y3+1][x1+x2];
- p1[0] = p1[1] = p2[0] = p2[1] = data2[i];
- p1[2] = p1[3] = p2[2] = p2[3] = data2[i+1];
- p1[4] = p1[5] = p2[4] = p2[5] = data2[i+2];
- p1[6] = p1[7] = p2[6] = p2[7] = data2[i+3];
- p1[8] = p1[9] = p2[8] = p2[9] = data2[i+4];
- p1[10] = p1[11] = p2[10] = p2[11] = data2[i+5];
- p1[12] = p1[13] = p2[12] = p2[13] = data2[i+6];
- p1[14] = p1[15] = p2[14] = p2[15] = data2[i+7];
- }
- } else {
- i = 0;
- for (y3 = 0, y4 = 0; y3 < 8; ++y3, y4 += vSub) {
- for (x3 = 0, x4 = 0; x3 < 8; ++x3, x4 += hSub) {
- for (y5 = 0; y5 < vSub; ++y5)
- for (x5 = 0; x5 < hSub; ++x5)
- rowBuf[cc][y2+y4+y5][x1+x2+x4+x5] = data2[i];
- ++i;
- }
- }
- }
- }
- }
- }
- --restartCtr;
-
- // color space conversion
- if (colorXform) {
- // convert YCbCr to RGB
- if (numComps == 3) {
- for (y2 = 0; y2 < mcuHeight; ++y2) {
- for (x2 = 0; x2 < mcuWidth; ++x2) {
- pY = rowBuf[0][y2][x1+x2];
- pCb = rowBuf[1][y2][x1+x2] - 128;
- pCr = rowBuf[2][y2][x1+x2] - 128;
- pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16;
- rowBuf[0][y2][x1+x2] = dctClip[dctClipOffset + pR];
- pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr + 32768) >> 16;
- rowBuf[1][y2][x1+x2] = dctClip[dctClipOffset + pG];
- pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16;
- rowBuf[2][y2][x1+x2] = dctClip[dctClipOffset + pB];
- }
- }
- // convert YCbCrK to CMYK (K is passed through unchanged)
- } else if (numComps == 4) {
- for (y2 = 0; y2 < mcuHeight; ++y2) {
- for (x2 = 0; x2 < mcuWidth; ++x2) {
- pY = rowBuf[0][y2][x1+x2];
- pCb = rowBuf[1][y2][x1+x2] - 128;
- pCr = rowBuf[2][y2][x1+x2] - 128;
- pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16;
- rowBuf[0][y2][x1+x2] = 255 - dctClip[dctClipOffset + pR];
- pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr + 32768) >> 16;
- rowBuf[1][y2][x1+x2] = 255 - dctClip[dctClipOffset + pG];
- pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16;
- rowBuf[2][y2][x1+x2] = 255 - dctClip[dctClipOffset + pB];
- }
- }
- }
- }
- }
- return gTrue;
-}
-
-// Read one scan from a progressive or non-interleaved JPEG stream.
-void DCTStream::readScan() {
- int data[64];
- int x1, y1, dx1, dy1, x2, y2, y3, cc, i;
- int h, v, horiz, vert, vSub;
- int *p1;
- int c;
-
- if (scanInfo.numComps == 1) {
- for (cc = 0; cc < numComps; ++cc) {
- if (scanInfo.comp[cc]) {
- break;
- }
- }
- dx1 = mcuWidth / compInfo[cc].hSample;
- dy1 = mcuHeight / compInfo[cc].vSample;
- } else {
- dx1 = mcuWidth;
- dy1 = mcuHeight;
- }
-
- for (y1 = 0; y1 < height; y1 += dy1) {
- for (x1 = 0; x1 < width; x1 += dx1) {
-
- // deal with restart marker
- if (restartInterval > 0 && restartCtr == 0) {
- c = readMarker();
- if (c != restartMarker) {
- error(getPos(), "Bad DCT data: incorrect restart marker");
- return;
- }
- if (++restartMarker == 0xd8) {
- restartMarker = 0xd0;
- }
- restart();
- }
-
- // read one MCU
- for (cc = 0; cc < numComps; ++cc) {
- if (!scanInfo.comp[cc]) {
- continue;
- }
-
- h = compInfo[cc].hSample;
- v = compInfo[cc].vSample;
- horiz = mcuWidth / h;
- vert = mcuHeight / v;
- vSub = vert / 8;
- for (y2 = 0; y2 < dy1; y2 += vert) {
- for (x2 = 0; x2 < dx1; x2 += horiz) {
-
- // pull out the current values
- p1 = &frameBuf[cc][(y1+y2) * bufWidth + (x1+x2)];
- for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) {
- data[i] = p1[0];
- data[i+1] = p1[1];
- data[i+2] = p1[2];
- data[i+3] = p1[3];
- data[i+4] = p1[4];
- data[i+5] = p1[5];
- data[i+6] = p1[6];
- data[i+7] = p1[7];
- p1 += bufWidth * vSub;
- }
-
- // read one data unit
- if (progressive) {
- if (!readProgressiveDataUnit(
- &dcHuffTables[scanInfo.dcHuffTable[cc]],
- &acHuffTables[scanInfo.acHuffTable[cc]],
- &compInfo[cc].prevDC,
- data)) {
- return;
- }
- } else {
- if (!readDataUnit(&dcHuffTables[scanInfo.dcHuffTable[cc]],
- &acHuffTables[scanInfo.acHuffTable[cc]],
- &compInfo[cc].prevDC,
- data)) {
- return;
- }
- }
-
- // add the data unit into frameBuf
- p1 = &frameBuf[cc][(y1+y2) * bufWidth + (x1+x2)];
- for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) {
- p1[0] = data[i];
- p1[1] = data[i+1];
- p1[2] = data[i+2];
- p1[3] = data[i+3];
- p1[4] = data[i+4];
- p1[5] = data[i+5];
- p1[6] = data[i+6];
- p1[7] = data[i+7];
- p1 += bufWidth * vSub;
- }
- }
- }
- }
- --restartCtr;
- }
- }
-}
-
-// Read one data unit from a sequential JPEG stream.
-GBool DCTStream::readDataUnit(DCTHuffTable *dcHuffTable,
- DCTHuffTable *acHuffTable,
- int *prevDC, int data[64]) {
- int run, size, amp;
- int c;
- int i, j;
-
- if ((size = readHuffSym(dcHuffTable)) == 9999) {
- return gFalse;
- }
- if (size > 0) {
- if ((amp = readAmp(size)) == 9999) {
- return gFalse;
- }
- } else {
- amp = 0;
- }
- data[0] = *prevDC += amp;
- for (i = 1; i < 64; ++i) {
- data[i] = 0;
- }
- i = 1;
- while (i < 64) {
- run = 0;
- while ((c = readHuffSym(acHuffTable)) == 0xf0 && run < 0x30) {
- run += 0x10;
- }
- if (c == 9999) {
- return gFalse;
- }
- if (c == 0x00) {
- break;
- } else {
- run += (c >> 4) & 0x0f;
- size = c & 0x0f;
- amp = readAmp(size);
- if (amp == 9999) {
- return gFalse;
- }
- i += run;
- if (i < 64) {
- j = dctZigZag[i++];
- data[j] = amp;
- }
- }
- }
- return gTrue;
-}
-
-// Read one data unit from a sequential JPEG stream.
-GBool DCTStream::readProgressiveDataUnit(DCTHuffTable *dcHuffTable,
- DCTHuffTable *acHuffTable,
- int *prevDC, int data[64]) {
- int run, size, amp, bit, c;
- int i, j, k;
-
- // get the DC coefficient
- i = scanInfo.firstCoeff;
- if (i == 0) {
- if (scanInfo.ah == 0) {
- if ((size = readHuffSym(dcHuffTable)) == 9999) {
- return gFalse;
- }
- if (size > 0) {
- if ((amp = readAmp(size)) == 9999) {
- return gFalse;
- }
- } else {
- amp = 0;
- }
- data[0] += (*prevDC += amp) << scanInfo.al;
- } else {
- if ((bit = readBit()) == 9999) {
- return gFalse;
- }
- data[0] += bit << scanInfo.al;
- }
- ++i;
- }
- if (scanInfo.lastCoeff == 0) {
- return gTrue;
- }
-
- // check for an EOB run
- if (eobRun > 0) {
- while (i <= scanInfo.lastCoeff) {
- j = dctZigZag[i++];
- if (data[j] != 0) {
- if ((bit = readBit()) == EOF) {
- return gFalse;
- }
- if (bit) {
- data[j] += 1 << scanInfo.al;
- }
- }
- }
- --eobRun;
- return gTrue;
- }
-
- // read the AC coefficients
- while (i <= scanInfo.lastCoeff) {
- if ((c = readHuffSym(acHuffTable)) == 9999) {
- return gFalse;
- }
-
- // ZRL
- if (c == 0xf0) {
- k = 0;
- while (k < 16) {
- j = dctZigZag[i++];
- if (data[j] == 0) {
- ++k;
- } else {
- if ((bit = readBit()) == EOF) {
- return gFalse;
- }
- if (bit) {
- data[j] += 1 << scanInfo.al;
- }
- }
- }
-
- // EOB run
- } else if ((c & 0x0f) == 0x00) {
- j = c >> 4;
- eobRun = 0;
- for (k = 0; k < j; ++k) {
- if ((bit = readBit()) == EOF) {
- return gFalse;
- }
- eobRun = (eobRun << 1) | bit;
- }
- eobRun += 1 << j;
- while (i <= scanInfo.lastCoeff) {
- j = dctZigZag[i++];
- if (data[j] != 0) {
- if ((bit = readBit()) == EOF) {
- return gFalse;
- }
- if (bit) {
- data[j] += 1 << scanInfo.al;
- }
- }
- }
- --eobRun;
- break;
-
- // zero run and one AC coefficient
- } else {
- run = (c >> 4) & 0x0f;
- size = c & 0x0f;
- if ((amp = readAmp(size)) == 9999) {
- return gFalse;
- }
- k = 0;
- do {
- j = dctZigZag[i++];
- while (data[j] != 0) {
- if ((bit = readBit()) == EOF) {
- return gFalse;
- }
- if (bit) {
- data[j] += 1 << scanInfo.al;
- }
- j = dctZigZag[i++];
- }
- ++k;
- } while (k <= run);
- data[j] = amp << scanInfo.al;
- }
- }
-
- return gTrue;
-}
-
-// Decode a progressive JPEG image.
-void DCTStream::decodeImage() {
- int dataIn[64];
- Guchar dataOut[64];
- Gushort *quantTable;
- int pY, pCb, pCr, pR, pG, pB;
- int x1, y1, x2, y2, x3, y3, x4, y4, x5, y5, cc, i;
- int h, v, horiz, vert, hSub, vSub;
- int *p0, *p1, *p2;
-
- for (y1 = 0; y1 < bufHeight; y1 += mcuHeight) {
- for (x1 = 0; x1 < bufWidth; x1 += mcuWidth) {
- for (cc = 0; cc < numComps; ++cc) {
- quantTable = quantTables[compInfo[cc].quantTable];
- h = compInfo[cc].hSample;
- v = compInfo[cc].vSample;
- horiz = mcuWidth / h;
- vert = mcuHeight / v;
- hSub = horiz / 8;
- vSub = vert / 8;
- for (y2 = 0; y2 < mcuHeight; y2 += vert) {
- for (x2 = 0; x2 < mcuWidth; x2 += horiz) {
-
- // pull out the coded data unit
- p1 = &frameBuf[cc][(y1+y2) * bufWidth + (x1+x2)];
- for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) {
- dataIn[i] = p1[0];
- dataIn[i+1] = p1[1];
- dataIn[i+2] = p1[2];
- dataIn[i+3] = p1[3];
- dataIn[i+4] = p1[4];
- dataIn[i+5] = p1[5];
- dataIn[i+6] = p1[6];
- dataIn[i+7] = p1[7];
- p1 += bufWidth * vSub;
- }
-
- // transform
- transformDataUnit(quantTable, dataIn, dataOut);
-
- // store back into frameBuf, doing replication for
- // subsampled components
- p1 = &frameBuf[cc][(y1+y2) * bufWidth + (x1+x2)];
- if (hSub == 1 && vSub == 1) {
- for (y3 = 0, i = 0; y3 < 8; ++y3, i += 8) {
- p1[0] = dataOut[i] & 0xff;
- p1[1] = dataOut[i+1] & 0xff;
- p1[2] = dataOut[i+2] & 0xff;
- p1[3] = dataOut[i+3] & 0xff;
- p1[4] = dataOut[i+4] & 0xff;
- p1[5] = dataOut[i+5] & 0xff;
- p1[6] = dataOut[i+6] & 0xff;
- p1[7] = dataOut[i+7] & 0xff;
- p1 += bufWidth;
- }
- } else if (hSub == 2 && vSub == 2) {
- p2 = p1 + bufWidth;
- for (y3 = 0, i = 0; y3 < 16; y3 += 2, i += 8) {
- p1[0] = p1[1] = p2[0] = p2[1] = dataOut[i] & 0xff;
- p1[2] = p1[3] = p2[2] = p2[3] = dataOut[i+1] & 0xff;
- p1[4] = p1[5] = p2[4] = p2[5] = dataOut[i+2] & 0xff;
- p1[6] = p1[7] = p2[6] = p2[7] = dataOut[i+3] & 0xff;
- p1[8] = p1[9] = p2[8] = p2[9] = dataOut[i+4] & 0xff;
- p1[10] = p1[11] = p2[10] = p2[11] = dataOut[i+5] & 0xff;
- p1[12] = p1[13] = p2[12] = p2[13] = dataOut[i+6] & 0xff;
- p1[14] = p1[15] = p2[14] = p2[15] = dataOut[i+7] & 0xff;
- p1 += bufWidth * 2;
- p2 += bufWidth * 2;
- }
- } else {
- i = 0;
- for (y3 = 0, y4 = 0; y3 < 8; ++y3, y4 += vSub) {
- for (x3 = 0, x4 = 0; x3 < 8; ++x3, x4 += hSub) {
- p2 = p1 + x4;
- for (y5 = 0; y5 < vSub; ++y5) {
- for (x5 = 0; x5 < hSub; ++x5) {
- p2[x5] = dataOut[i] & 0xff;
- }
- p2 += bufWidth;
- }
- ++i;
- }
- p1 += bufWidth * vSub;
- }
- }
- }
- }
- }
-
- // color space conversion
- if (colorXform) {
- // convert YCbCr to RGB
- if (numComps == 3) {
- for (y2 = 0; y2 < mcuHeight; ++y2) {
- p0 = &frameBuf[0][(y1+y2) * bufWidth + x1];
- p1 = &frameBuf[1][(y1+y2) * bufWidth + x1];
- p2 = &frameBuf[2][(y1+y2) * bufWidth + x1];
- for (x2 = 0; x2 < mcuWidth; ++x2) {
- pY = *p0;
- pCb = *p1 - 128;
- pCr = *p2 - 128;
- pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16;
- *p0++ = dctClip[dctClipOffset + pR];
- pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr +
- 32768) >> 16;
- *p1++ = dctClip[dctClipOffset + pG];
- pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16;
- *p2++ = dctClip[dctClipOffset + pB];
- }
- }
- // convert YCbCrK to CMYK (K is passed through unchanged)
- } else if (numComps == 4) {
- for (y2 = 0; y2 < mcuHeight; ++y2) {
- p0 = &frameBuf[0][(y1+y2) * bufWidth + x1];
- p1 = &frameBuf[1][(y1+y2) * bufWidth + x1];
- p2 = &frameBuf[2][(y1+y2) * bufWidth + x1];
- for (x2 = 0; x2 < mcuWidth; ++x2) {
- pY = *p0;
- pCb = *p1 - 128;
- pCr = *p2 - 128;
- pR = ((pY << 16) + dctCrToR * pCr + 32768) >> 16;
- *p0++ = 255 - dctClip[dctClipOffset + pR];
- pG = ((pY << 16) + dctCbToG * pCb + dctCrToG * pCr +
- 32768) >> 16;
- *p1++ = 255 - dctClip[dctClipOffset + pG];
- pB = ((pY << 16) + dctCbToB * pCb + 32768) >> 16;
- *p2++ = 255 - dctClip[dctClipOffset + pB];
- }
- }
- }
- }
- }
- }
-}
-
-// Transform one data unit -- this performs the dequantization and
-// IDCT steps. This IDCT algorithm is taken from:
-// Christoph Loeffler, Adriaan Ligtenberg, George S. Moschytz,
-// "Practical Fast 1-D DCT Algorithms with 11 Multiplications",
-// IEEE Intl. Conf. on Acoustics, Speech & Signal Processing, 1989,
-// 988-991.
-// The stage numbers mentioned in the comments refer to Figure 1 in this
-// paper.
-void DCTStream::transformDataUnit(Gushort *quantTable,
- int dataIn[64], Guchar dataOut[64]) {
- int v0, v1, v2, v3, v4, v5, v6, v7, t;
- int *p;
- int i;
-
- // dequant
- for (i = 0; i < 64; ++i) {
- dataIn[i] *= quantTable[i];
- }
-
- // inverse DCT on rows
- for (i = 0; i < 64; i += 8) {
- p = dataIn + i;
-
- // check for all-zero AC coefficients
- if (p[1] == 0 && p[2] == 0 && p[3] == 0 &&
- p[4] == 0 && p[5] == 0 && p[6] == 0 && p[7] == 0) {
- t = (dctSqrt2 * p[0] + 512) >> 10;
- p[0] = t;
- p[1] = t;
- p[2] = t;
- p[3] = t;
- p[4] = t;
- p[5] = t;
- p[6] = t;
- p[7] = t;
- continue;
- }
-
- // stage 4
- v0 = (dctSqrt2 * p[0] + 128) >> 8;
- v1 = (dctSqrt2 * p[4] + 128) >> 8;
- v2 = p[2];
- v3 = p[6];
- v4 = (dctSqrt1d2 * (p[1] - p[7]) + 128) >> 8;
- v7 = (dctSqrt1d2 * (p[1] + p[7]) + 128) >> 8;
- v5 = p[3] << 4;
- v6 = p[5] << 4;
-
- // stage 3
- t = (v0 - v1+ 1) >> 1;
- v0 = (v0 + v1 + 1) >> 1;
- v1 = t;
- t = (v2 * dctSin6 + v3 * dctCos6 + 128) >> 8;
- v2 = (v2 * dctCos6 - v3 * dctSin6 + 128) >> 8;
- v3 = t;
- t = (v4 - v6 + 1) >> 1;
- v4 = (v4 + v6 + 1) >> 1;
- v6 = t;
- t = (v7 + v5 + 1) >> 1;
- v5 = (v7 - v5 + 1) >> 1;
- v7 = t;
-
- // stage 2
- t = (v0 - v3 + 1) >> 1;
- v0 = (v0 + v3 + 1) >> 1;
- v3 = t;
- t = (v1 - v2 + 1) >> 1;
- v1 = (v1 + v2 + 1) >> 1;
- v2 = t;
- t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12;
- v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12;
- v7 = t;
- t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12;
- v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12;
- v6 = t;
-
- // stage 1
- p[0] = v0 + v7;
- p[7] = v0 - v7;
- p[1] = v1 + v6;
- p[6] = v1 - v6;
- p[2] = v2 + v5;
- p[5] = v2 - v5;
- p[3] = v3 + v4;
- p[4] = v3 - v4;
- }
-
- // inverse DCT on columns
- for (i = 0; i < 8; ++i) {
- p = dataIn + i;
-
- // check for all-zero AC coefficients
- if (p[1*8] == 0 && p[2*8] == 0 && p[3*8] == 0 &&
- p[4*8] == 0 && p[5*8] == 0 && p[6*8] == 0 && p[7*8] == 0) {
- t = (dctSqrt2 * dataIn[i+0] + 8192) >> 14;
- p[0*8] = t;
- p[1*8] = t;
- p[2*8] = t;
- p[3*8] = t;
- p[4*8] = t;
- p[5*8] = t;
- p[6*8] = t;
- p[7*8] = t;
- continue;
- }
-
- // stage 4
- v0 = (dctSqrt2 * p[0*8] + 2048) >> 12;
- v1 = (dctSqrt2 * p[4*8] + 2048) >> 12;
- v2 = p[2*8];
- v3 = p[6*8];
- v4 = (dctSqrt1d2 * (p[1*8] - p[7*8]) + 2048) >> 12;
- v7 = (dctSqrt1d2 * (p[1*8] + p[7*8]) + 2048) >> 12;
- v5 = p[3*8];
- v6 = p[5*8];
-
- // stage 3
- t = (v0 - v1 + 1) >> 1;
- v0 = (v0 + v1 + 1) >> 1;
- v1 = t;
- t = (v2 * dctSin6 + v3 * dctCos6 + 2048) >> 12;
- v2 = (v2 * dctCos6 - v3 * dctSin6 + 2048) >> 12;
- v3 = t;
- t = (v4 - v6 + 1) >> 1;
- v4 = (v4 + v6 + 1) >> 1;
- v6 = t;
- t = (v7 + v5 + 1) >> 1;
- v5 = (v7 - v5 + 1) >> 1;
- v7 = t;
-
- // stage 2
- t = (v0 - v3 + 1) >> 1;
- v0 = (v0 + v3 + 1) >> 1;
- v3 = t;
- t = (v1 - v2 + 1) >> 1;
- v1 = (v1 + v2 + 1) >> 1;
- v2 = t;
- t = (v4 * dctSin3 + v7 * dctCos3 + 2048) >> 12;
- v4 = (v4 * dctCos3 - v7 * dctSin3 + 2048) >> 12;
- v7 = t;
- t = (v5 * dctSin1 + v6 * dctCos1 + 2048) >> 12;
- v5 = (v5 * dctCos1 - v6 * dctSin1 + 2048) >> 12;
- v6 = t;
-
- // stage 1
- p[0*8] = v0 + v7;
- p[7*8] = v0 - v7;
- p[1*8] = v1 + v6;
- p[6*8] = v1 - v6;
- p[2*8] = v2 + v5;
- p[5*8] = v2 - v5;
- p[3*8] = v3 + v4;
- p[4*8] = v3 - v4;
- }
-
- // convert to 8-bit integers
- for (i = 0; i < 64; ++i) {
- dataOut[i] = dctClip[dctClipOffset + 128 + ((dataIn[i] + 8) >> 4)];
- }
-}
-
-int DCTStream::readHuffSym(DCTHuffTable *table) {
- Gushort code;
- int bit;
- int codeBits;
-
- code = 0;
- codeBits = 0;
- do {
- // add a bit to the code
- if ((bit = readBit()) == EOF)
- return 9999;
- code = (code << 1) + bit;
- ++codeBits;
-
- // look up code
- if (code - table->firstCode[codeBits] < table->numCodes[codeBits]) {
- code -= table->firstCode[codeBits];
- return table->sym[table->firstSym[codeBits] + code];
- }
- } while (codeBits < 16);
-
- error(getPos(), "Bad Huffman code in DCT stream");
- return 9999;
-}
-
-int DCTStream::readAmp(int size) {
- int amp, bit;
- int bits;
-
- amp = 0;
- for (bits = 0; bits < size; ++bits) {
- if ((bit = readBit()) == EOF)
- return 9999;
- amp = (amp << 1) + bit;
- }
- if (amp < (1 << (size - 1)))
- amp -= (1 << size) - 1;
- return amp;
-}
-
-int DCTStream::readBit() {
- int bit;
- int c, c2;
-
- if (inputBits == 0) {
- if ((c = str->getChar()) == EOF)
- return EOF;
- if (c == 0xff) {
- do {
- c2 = str->getChar();
- } while (c2 == 0xff);
- if (c2 != 0x00) {
- error(getPos(), "Bad DCT data: missing 00 after ff");
- return EOF;
- }
- }
- inputBuf = c;
- inputBits = 8;
- }
- bit = (inputBuf >> (inputBits - 1)) & 1;
- --inputBits;
- return bit;
-}
-
-GBool DCTStream::readHeader() {
- GBool doScan;
- int n;
- int c = 0;
- int i;
-
- // read headers
- doScan = gFalse;
- while (!doScan) {
- c = readMarker();
- switch (c) {
- case 0xc0: // SOF0 (sequential)
- case 0xc1: // SOF1 (extended sequential)
- if (!readBaselineSOF()) {
- return gFalse;
- }
- break;
- case 0xc2: // SOF2 (progressive)
- if (!readProgressiveSOF()) {
- return gFalse;
- }
- break;
- case 0xc4: // DHT
- if (!readHuffmanTables()) {
- return gFalse;
- }
- break;
- case 0xd8: // SOI
- break;
- case 0xd9: // EOI
- return gFalse;
- case 0xda: // SOS
- if (!readScanInfo()) {
- return gFalse;
- }
- doScan = gTrue;
- break;
- case 0xdb: // DQT
- if (!readQuantTables()) {
- return gFalse;
- }
- break;
- case 0xdd: // DRI
- if (!readRestartInterval()) {
- return gFalse;
- }
- break;
- case 0xe0: // APP0
- if (!readJFIFMarker()) {
- return gFalse;
- }
- break;
- case 0xee: // APP14
- if (!readAdobeMarker()) {
- return gFalse;
- }
- break;
- case EOF:
- error(getPos(), "Bad DCT header");
- return gFalse;
- default:
- // skip APPn / COM / etc.
- if (c >= 0xe0) {
- n = read16() - 2;
- for (i = 0; i < n; ++i) {
- str->getChar();
- }
- } else {
- error(getPos(), "Unknown DCT marker <%02x>", c);
- return gFalse;
- }
- break;
- }
- }
-
- return gTrue;
-}
-
-GBool DCTStream::readBaselineSOF() {
- int length;
- int prec;
- int i;
- int c;
-
- length = read16();
- prec = str->getChar();
- height = read16();
- width = read16();
- numComps = str->getChar();
- if (numComps <= 0 || numComps > 4) {
- error(getPos(), "Bad number of components in DCT stream", prec);
- return gFalse;
- }
- if (numComps <= 0 || numComps > 4) {
- error(getPos(), "Bad number of components in DCT stream", prec);
- return gFalse;
- }
- if (prec != 8) {
- error(getPos(), "Bad DCT precision %d", prec);
- return gFalse;
- }
- for (i = 0; i < numComps; ++i) {
- compInfo[i].id = str->getChar();
- c = str->getChar();
- compInfo[i].hSample = (c >> 4) & 0x0f;
- compInfo[i].vSample = c & 0x0f;
- compInfo[i].quantTable = str->getChar();
- }
- progressive = gFalse;
- return gTrue;
-}
-
-GBool DCTStream::readProgressiveSOF() {
- int length;
- int prec;
- int i;
- int c;
-
- length = read16();
- prec = str->getChar();
- height = read16();
- width = read16();
- numComps = str->getChar();
- if (prec != 8) {
- error(getPos(), "Bad DCT precision %d", prec);
- return gFalse;
- }
- for (i = 0; i < numComps; ++i) {
- compInfo[i].id = str->getChar();
- c = str->getChar();
- compInfo[i].hSample = (c >> 4) & 0x0f;
- compInfo[i].vSample = c & 0x0f;
- compInfo[i].quantTable = str->getChar();
- }
- progressive = gTrue;
- return gTrue;
-}
-
-GBool DCTStream::readScanInfo() {
- int length;
- int id, c;
- int i, j;
-
- length = read16() - 2;
- scanInfo.numComps = str->getChar();
- --length;
- if (length != 2 * scanInfo.numComps + 3) {
- error(getPos(), "Bad DCT scan info block");
- return gFalse;
- }
- interleaved = scanInfo.numComps == numComps;
- for (j = 0; j < numComps; ++j) {
- scanInfo.comp[j] = gFalse;
- }
- for (i = 0; i < scanInfo.numComps; ++i) {
- id = str->getChar();
- // some (broken) DCT streams reuse ID numbers, but at least they
- // keep the components in order, so we check compInfo[i] first to
- // work around the problem
- if (id == compInfo[i].id) {
- j = i;
- } else {
- for (j = 0; j < numComps; ++j) {
- if (id == compInfo[j].id) {
- break;
- }
- }
- if (j == numComps) {
- error(getPos(), "Bad DCT component ID in scan info block");
- return gFalse;
- }
- }
- scanInfo.comp[j] = gTrue;
- c = str->getChar();
- scanInfo.dcHuffTable[j] = (c >> 4) & 0x0f;
- scanInfo.acHuffTable[j] = c & 0x0f;
- }
- scanInfo.firstCoeff = str->getChar();
- scanInfo.lastCoeff = str->getChar();
- c = str->getChar();
- scanInfo.ah = (c >> 4) & 0x0f;
- scanInfo.al = c & 0x0f;
- return gTrue;
-}
-
-GBool DCTStream::readQuantTables() {
- int length, prec, i, index;
-
- length = read16() - 2;
- while (length > 0) {
- index = str->getChar();
- prec = (index >> 4) & 0x0f;
- index &= 0x0f;
- if (prec > 1 || index >= 4) {
- error(getPos(), "Bad DCT quantization table");
- return gFalse;
- }
- if (index == numQuantTables) {
- numQuantTables = index + 1;
- }
- for (i = 0; i < 64; ++i) {
- if (prec) {
- quantTables[index][dctZigZag[i]] = read16();
- } else {
- quantTables[index][dctZigZag[i]] = str->getChar();
- }
- }
- if (prec) {
- length -= 129;
- } else {
- length -= 65;
- }
- }
- return gTrue;
-}
-
-GBool DCTStream::readHuffmanTables() {
- DCTHuffTable *tbl;
- int length;
- int index;
- Gushort code;
- Guchar sym;
- int i;
- int c;
-
- length = read16() - 2;
- while (length > 0) {
- index = str->getChar();
- --length;
- if ((index & 0x0f) >= 4) {
- error(getPos(), "Bad DCT Huffman table");
- return gFalse;
- }
- if (index & 0x10) {
- index &= 0x0f;
- if (index >= numACHuffTables)
- numACHuffTables = index+1;
- tbl = &acHuffTables[index];
- } else {
- if (index >= numDCHuffTables)
- numDCHuffTables = index+1;
- tbl = &dcHuffTables[index];
- }
- sym = 0;
- code = 0;
- for (i = 1; i <= 16; ++i) {
- c = str->getChar();
- tbl->firstSym[i] = sym;
- tbl->firstCode[i] = code;
- tbl->numCodes[i] = c;
- sym += c;
- code = (code + c) << 1;
- }
- length -= 16;
- for (i = 0; i < sym; ++i)
- tbl->sym[i] = str->getChar();
- length -= sym;
- }
- return gTrue;
-}
-
-GBool DCTStream::readRestartInterval() {
- int length;
-
- length = read16();
- if (length != 4) {
- error(getPos(), "Bad DCT restart interval");
- return gFalse;
- }
- restartInterval = read16();
- return gTrue;
-}
-
-GBool DCTStream::readJFIFMarker() {
- int length, i;
- char buf[5];
- int c;
-
- length = read16();
- length -= 2;
- if (length >= 5) {
- for (i = 0; i < 5; ++i) {
- if ((c = str->getChar()) == EOF) {
- error(getPos(), "Bad DCT APP0 marker");
- return gFalse;
- }
- buf[i] = c;
- }
- length -= 5;
- if (!memcmp(buf, "JFIF\0", 5)) {
- gotJFIFMarker = gTrue;
- }
- }
- while (length > 0) {
- if (str->getChar() == EOF) {
- error(getPos(), "Bad DCT APP0 marker");
- return gFalse;
- }
- --length;
- }
- return gTrue;
-}
-
-GBool DCTStream::readAdobeMarker() {
- int length, i;
- char buf[12];
- int c;
-
- length = read16();
- if (length < 14) {
- goto err;
- }
- for (i = 0; i < 12; ++i) {
- if ((c = str->getChar()) == EOF) {
- goto err;
- }
- buf[i] = c;
- }
- if (strncmp(buf, "Adobe", 5)) {
- goto err;
- }
- colorXform = buf[11];
- gotAdobeMarker = gTrue;
- for (i = 14; i < length; ++i) {
- if (str->getChar() == EOF) {
- goto err;
- }
- }
- return gTrue;
-
- err:
- error(getPos(), "Bad DCT Adobe APP14 marker");
- return gFalse;
-}
-
-GBool DCTStream::readTrailer() {
- int c;
-
- c = readMarker();
- if (c != 0xd9) { // EOI
- error(getPos(), "Bad DCT trailer");
- return gFalse;
- }
- return gTrue;
-}
-
-int DCTStream::readMarker() {
- int c;
-
- do {
- do {
- c = str->getChar();
- } while (c != 0xff && c != EOF);
- do {
- c = str->getChar();
- } while (c == 0xff);
- } while (c == 0x00);
- return c;
-}
-
-int DCTStream::read16() {
- int c1, c2;
-
- if ((c1 = str->getChar()) == EOF)
- return EOF;
- if ((c2 = str->getChar()) == EOF)
- return EOF;
- return (c1 << 8) + c2;
-}
-
-GString *DCTStream::getPSFilter(int psLevel, char *indent) {
- GString *s;
-
- if (psLevel < 2) {
- return NULL;
- }
- if (!(s = str->getPSFilter(psLevel, indent))) {
- return NULL;
- }
- s->append(indent)->append("<< >> /DCTDecode filter\n");
- return s;
-}
-
-GBool DCTStream::isBinary(GBool last) {
- return str->isBinary(gTrue);
-}
-
-//------------------------------------------------------------------------
-// FlateStream
-//------------------------------------------------------------------------
-
-int FlateStream::codeLenCodeMap[flateMaxCodeLenCodes] = {
- 16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15
-};
-
-FlateDecode FlateStream::lengthDecode[flateMaxLitCodes-257] = {
- {0, 3},
- {0, 4},
- {0, 5},
- {0, 6},
- {0, 7},
- {0, 8},
- {0, 9},
- {0, 10},
- {1, 11},
- {1, 13},
- {1, 15},
- {1, 17},
- {2, 19},
- {2, 23},
- {2, 27},
- {2, 31},
- {3, 35},
- {3, 43},
- {3, 51},
- {3, 59},
- {4, 67},
- {4, 83},
- {4, 99},
- {4, 115},
- {5, 131},
- {5, 163},
- {5, 195},
- {5, 227},
- {0, 258},
- {0, 258},
- {0, 258}
-};
-
-FlateDecode FlateStream::distDecode[flateMaxDistCodes] = {
- { 0, 1},
- { 0, 2},
- { 0, 3},
- { 0, 4},
- { 1, 5},
- { 1, 7},
- { 2, 9},
- { 2, 13},
- { 3, 17},
- { 3, 25},
- { 4, 33},
- { 4, 49},
- { 5, 65},
- { 5, 97},
- { 6, 129},
- { 6, 193},
- { 7, 257},
- { 7, 385},
- { 8, 513},
- { 8, 769},
- { 9, 1025},
- { 9, 1537},
- {10, 2049},
- {10, 3073},
- {11, 4097},
- {11, 6145},
- {12, 8193},
- {12, 12289},
- {13, 16385},
- {13, 24577}
-};
-
-static FlateCode flateFixedLitCodeTabCodes[512] = {
- {7, 0x0100},
- {8, 0x0050},
- {8, 0x0010},
- {8, 0x0118},
- {7, 0x0110},
- {8, 0x0070},
- {8, 0x0030},
- {9, 0x00c0},
- {7, 0x0108},
- {8, 0x0060},
- {8, 0x0020},
- {9, 0x00a0},
- {8, 0x0000},
- {8, 0x0080},
- {8, 0x0040},
- {9, 0x00e0},
- {7, 0x0104},
- {8, 0x0058},
- {8, 0x0018},
- {9, 0x0090},
- {7, 0x0114},
- {8, 0x0078},
- {8, 0x0038},
- {9, 0x00d0},
- {7, 0x010c},
- {8, 0x0068},
- {8, 0x0028},
- {9, 0x00b0},
- {8, 0x0008},
- {8, 0x0088},
- {8, 0x0048},
- {9, 0x00f0},
- {7, 0x0102},
- {8, 0x0054},
- {8, 0x0014},
- {8, 0x011c},
- {7, 0x0112},
- {8, 0x0074},
- {8, 0x0034},
- {9, 0x00c8},
- {7, 0x010a},
- {8, 0x0064},
- {8, 0x0024},
- {9, 0x00a8},
- {8, 0x0004},
- {8, 0x0084},
- {8, 0x0044},
- {9, 0x00e8},
- {7, 0x0106},
- {8, 0x005c},
- {8, 0x001c},
- {9, 0x0098},
- {7, 0x0116},
- {8, 0x007c},
- {8, 0x003c},
- {9, 0x00d8},
- {7, 0x010e},
- {8, 0x006c},
- {8, 0x002c},
- {9, 0x00b8},
- {8, 0x000c},
- {8, 0x008c},
- {8, 0x004c},
- {9, 0x00f8},
- {7, 0x0101},
- {8, 0x0052},
- {8, 0x0012},
- {8, 0x011a},
- {7, 0x0111},
- {8, 0x0072},
- {8, 0x0032},
- {9, 0x00c4},
- {7, 0x0109},
- {8, 0x0062},
- {8, 0x0022},
- {9, 0x00a4},
- {8, 0x0002},
- {8, 0x0082},
- {8, 0x0042},
- {9, 0x00e4},
- {7, 0x0105},
- {8, 0x005a},
- {8, 0x001a},
- {9, 0x0094},
- {7, 0x0115},
- {8, 0x007a},
- {8, 0x003a},
- {9, 0x00d4},
- {7, 0x010d},
- {8, 0x006a},
- {8, 0x002a},
- {9, 0x00b4},
- {8, 0x000a},
- {8, 0x008a},
- {8, 0x004a},
- {9, 0x00f4},
- {7, 0x0103},
- {8, 0x0056},
- {8, 0x0016},
- {8, 0x011e},
- {7, 0x0113},
- {8, 0x0076},
- {8, 0x0036},
- {9, 0x00cc},
- {7, 0x010b},
- {8, 0x0066},
- {8, 0x0026},
- {9, 0x00ac},
- {8, 0x0006},
- {8, 0x0086},
- {8, 0x0046},
- {9, 0x00ec},
- {7, 0x0107},
- {8, 0x005e},
- {8, 0x001e},
- {9, 0x009c},
- {7, 0x0117},
- {8, 0x007e},
- {8, 0x003e},
- {9, 0x00dc},
- {7, 0x010f},
- {8, 0x006e},
- {8, 0x002e},
- {9, 0x00bc},
- {8, 0x000e},
- {8, 0x008e},
- {8, 0x004e},
- {9, 0x00fc},
- {7, 0x0100},
- {8, 0x0051},
- {8, 0x0011},
- {8, 0x0119},
- {7, 0x0110},
- {8, 0x0071},
- {8, 0x0031},
- {9, 0x00c2},
- {7, 0x0108},
- {8, 0x0061},
- {8, 0x0021},
- {9, 0x00a2},
- {8, 0x0001},
- {8, 0x0081},
- {8, 0x0041},
- {9, 0x00e2},
- {7, 0x0104},
- {8, 0x0059},
- {8, 0x0019},
- {9, 0x0092},
- {7, 0x0114},
- {8, 0x0079},
- {8, 0x0039},
- {9, 0x00d2},
- {7, 0x010c},
- {8, 0x0069},
- {8, 0x0029},
- {9, 0x00b2},
- {8, 0x0009},
- {8, 0x0089},
- {8, 0x0049},
- {9, 0x00f2},
- {7, 0x0102},
- {8, 0x0055},
- {8, 0x0015},
- {8, 0x011d},
- {7, 0x0112},
- {8, 0x0075},
- {8, 0x0035},
- {9, 0x00ca},
- {7, 0x010a},
- {8, 0x0065},
- {8, 0x0025},
- {9, 0x00aa},
- {8, 0x0005},
- {8, 0x0085},
- {8, 0x0045},
- {9, 0x00ea},
- {7, 0x0106},
- {8, 0x005d},
- {8, 0x001d},
- {9, 0x009a},
- {7, 0x0116},
- {8, 0x007d},
- {8, 0x003d},
- {9, 0x00da},
- {7, 0x010e},
- {8, 0x006d},
- {8, 0x002d},
- {9, 0x00ba},
- {8, 0x000d},
- {8, 0x008d},
- {8, 0x004d},
- {9, 0x00fa},
- {7, 0x0101},
- {8, 0x0053},
- {8, 0x0013},
- {8, 0x011b},
- {7, 0x0111},
- {8, 0x0073},
- {8, 0x0033},
- {9, 0x00c6},
- {7, 0x0109},
- {8, 0x0063},
- {8, 0x0023},
- {9, 0x00a6},
- {8, 0x0003},
- {8, 0x0083},
- {8, 0x0043},
- {9, 0x00e6},
- {7, 0x0105},
- {8, 0x005b},
- {8, 0x001b},
- {9, 0x0096},
- {7, 0x0115},
- {8, 0x007b},
- {8, 0x003b},
- {9, 0x00d6},
- {7, 0x010d},
- {8, 0x006b},
- {8, 0x002b},
- {9, 0x00b6},
- {8, 0x000b},
- {8, 0x008b},
- {8, 0x004b},
- {9, 0x00f6},
- {7, 0x0103},
- {8, 0x0057},
- {8, 0x0017},
- {8, 0x011f},
- {7, 0x0113},
- {8, 0x0077},
- {8, 0x0037},
- {9, 0x00ce},
- {7, 0x010b},
- {8, 0x0067},
- {8, 0x0027},
- {9, 0x00ae},
- {8, 0x0007},
- {8, 0x0087},
- {8, 0x0047},
- {9, 0x00ee},
- {7, 0x0107},
- {8, 0x005f},
- {8, 0x001f},
- {9, 0x009e},
- {7, 0x0117},
- {8, 0x007f},
- {8, 0x003f},
- {9, 0x00de},
- {7, 0x010f},
- {8, 0x006f},
- {8, 0x002f},
- {9, 0x00be},
- {8, 0x000f},
- {8, 0x008f},
- {8, 0x004f},
- {9, 0x00fe},
- {7, 0x0100},
- {8, 0x0050},
- {8, 0x0010},
- {8, 0x0118},
- {7, 0x0110},
- {8, 0x0070},
- {8, 0x0030},
- {9, 0x00c1},
- {7, 0x0108},
- {8, 0x0060},
- {8, 0x0020},
- {9, 0x00a1},
- {8, 0x0000},
- {8, 0x0080},
- {8, 0x0040},
- {9, 0x00e1},
- {7, 0x0104},
- {8, 0x0058},
- {8, 0x0018},
- {9, 0x0091},
- {7, 0x0114},
- {8, 0x0078},
- {8, 0x0038},
- {9, 0x00d1},
- {7, 0x010c},
- {8, 0x0068},
- {8, 0x0028},
- {9, 0x00b1},
- {8, 0x0008},
- {8, 0x0088},
- {8, 0x0048},
- {9, 0x00f1},
- {7, 0x0102},
- {8, 0x0054},
- {8, 0x0014},
- {8, 0x011c},
- {7, 0x0112},
- {8, 0x0074},
- {8, 0x0034},
- {9, 0x00c9},
- {7, 0x010a},
- {8, 0x0064},
- {8, 0x0024},
- {9, 0x00a9},
- {8, 0x0004},
- {8, 0x0084},
- {8, 0x0044},
- {9, 0x00e9},
- {7, 0x0106},
- {8, 0x005c},
- {8, 0x001c},
- {9, 0x0099},
- {7, 0x0116},
- {8, 0x007c},
- {8, 0x003c},
- {9, 0x00d9},
- {7, 0x010e},
- {8, 0x006c},
- {8, 0x002c},
- {9, 0x00b9},
- {8, 0x000c},
- {8, 0x008c},
- {8, 0x004c},
- {9, 0x00f9},
- {7, 0x0101},
- {8, 0x0052},
- {8, 0x0012},
- {8, 0x011a},
- {7, 0x0111},
- {8, 0x0072},
- {8, 0x0032},
- {9, 0x00c5},
- {7, 0x0109},
- {8, 0x0062},
- {8, 0x0022},
- {9, 0x00a5},
- {8, 0x0002},
- {8, 0x0082},
- {8, 0x0042},
- {9, 0x00e5},
- {7, 0x0105},
- {8, 0x005a},
- {8, 0x001a},
- {9, 0x0095},
- {7, 0x0115},
- {8, 0x007a},
- {8, 0x003a},
- {9, 0x00d5},
- {7, 0x010d},
- {8, 0x006a},
- {8, 0x002a},
- {9, 0x00b5},
- {8, 0x000a},
- {8, 0x008a},
- {8, 0x004a},
- {9, 0x00f5},
- {7, 0x0103},
- {8, 0x0056},
- {8, 0x0016},
- {8, 0x011e},
- {7, 0x0113},
- {8, 0x0076},
- {8, 0x0036},
- {9, 0x00cd},
- {7, 0x010b},
- {8, 0x0066},
- {8, 0x0026},
- {9, 0x00ad},
- {8, 0x0006},
- {8, 0x0086},
- {8, 0x0046},
- {9, 0x00ed},
- {7, 0x0107},
- {8, 0x005e},
- {8, 0x001e},
- {9, 0x009d},
- {7, 0x0117},
- {8, 0x007e},
- {8, 0x003e},
- {9, 0x00dd},
- {7, 0x010f},
- {8, 0x006e},
- {8, 0x002e},
- {9, 0x00bd},
- {8, 0x000e},
- {8, 0x008e},
- {8, 0x004e},
- {9, 0x00fd},
- {7, 0x0100},
- {8, 0x0051},
- {8, 0x0011},
- {8, 0x0119},
- {7, 0x0110},
- {8, 0x0071},
- {8, 0x0031},
- {9, 0x00c3},
- {7, 0x0108},
- {8, 0x0061},
- {8, 0x0021},
- {9, 0x00a3},
- {8, 0x0001},
- {8, 0x0081},
- {8, 0x0041},
- {9, 0x00e3},
- {7, 0x0104},
- {8, 0x0059},
- {8, 0x0019},
- {9, 0x0093},
- {7, 0x0114},
- {8, 0x0079},
- {8, 0x0039},
- {9, 0x00d3},
- {7, 0x010c},
- {8, 0x0069},
- {8, 0x0029},
- {9, 0x00b3},
- {8, 0x0009},
- {8, 0x0089},
- {8, 0x0049},
- {9, 0x00f3},
- {7, 0x0102},
- {8, 0x0055},
- {8, 0x0015},
- {8, 0x011d},
- {7, 0x0112},
- {8, 0x0075},
- {8, 0x0035},
- {9, 0x00cb},
- {7, 0x010a},
- {8, 0x0065},
- {8, 0x0025},
- {9, 0x00ab},
- {8, 0x0005},
- {8, 0x0085},
- {8, 0x0045},
- {9, 0x00eb},
- {7, 0x0106},
- {8, 0x005d},
- {8, 0x001d},
- {9, 0x009b},
- {7, 0x0116},
- {8, 0x007d},
- {8, 0x003d},
- {9, 0x00db},
- {7, 0x010e},
- {8, 0x006d},
- {8, 0x002d},
- {9, 0x00bb},
- {8, 0x000d},
- {8, 0x008d},
- {8, 0x004d},
- {9, 0x00fb},
- {7, 0x0101},
- {8, 0x0053},
- {8, 0x0013},
- {8, 0x011b},
- {7, 0x0111},
- {8, 0x0073},
- {8, 0x0033},
- {9, 0x00c7},
- {7, 0x0109},
- {8, 0x0063},
- {8, 0x0023},
- {9, 0x00a7},
- {8, 0x0003},
- {8, 0x0083},
- {8, 0x0043},
- {9, 0x00e7},
- {7, 0x0105},
- {8, 0x005b},
- {8, 0x001b},
- {9, 0x0097},
- {7, 0x0115},
- {8, 0x007b},
- {8, 0x003b},
- {9, 0x00d7},
- {7, 0x010d},
- {8, 0x006b},
- {8, 0x002b},
- {9, 0x00b7},
- {8, 0x000b},
- {8, 0x008b},
- {8, 0x004b},
- {9, 0x00f7},
- {7, 0x0103},
- {8, 0x0057},
- {8, 0x0017},
- {8, 0x011f},
- {7, 0x0113},
- {8, 0x0077},
- {8, 0x0037},
- {9, 0x00cf},
- {7, 0x010b},
- {8, 0x0067},
- {8, 0x0027},
- {9, 0x00af},
- {8, 0x0007},
- {8, 0x0087},
- {8, 0x0047},
- {9, 0x00ef},
- {7, 0x0107},
- {8, 0x005f},
- {8, 0x001f},
- {9, 0x009f},
- {7, 0x0117},
- {8, 0x007f},
- {8, 0x003f},
- {9, 0x00df},
- {7, 0x010f},
- {8, 0x006f},
- {8, 0x002f},
- {9, 0x00bf},
- {8, 0x000f},
- {8, 0x008f},
- {8, 0x004f},
- {9, 0x00ff}
-};
-
-FlateHuffmanTab FlateStream::fixedLitCodeTab = {
- flateFixedLitCodeTabCodes, 9
-};
-
-static FlateCode flateFixedDistCodeTabCodes[32] = {
- {5, 0x0000},
- {5, 0x0010},
- {5, 0x0008},
- {5, 0x0018},
- {5, 0x0004},
- {5, 0x0014},
- {5, 0x000c},
- {5, 0x001c},
- {5, 0x0002},
- {5, 0x0012},
- {5, 0x000a},
- {5, 0x001a},
- {5, 0x0006},
- {5, 0x0016},
- {5, 0x000e},
- {0, 0x0000},
- {5, 0x0001},
- {5, 0x0011},
- {5, 0x0009},
- {5, 0x0019},
- {5, 0x0005},
- {5, 0x0015},
- {5, 0x000d},
- {5, 0x001d},
- {5, 0x0003},
- {5, 0x0013},
- {5, 0x000b},
- {5, 0x001b},
- {5, 0x0007},
- {5, 0x0017},
- {5, 0x000f},
- {0, 0x0000}
-};
-
-FlateHuffmanTab FlateStream::fixedDistCodeTab = {
- flateFixedDistCodeTabCodes, 5
-};
-
-FlateStream::FlateStream(Stream *strA, int predictor, int columns,
- int colors, int bits):
- FilterStream(strA) {
- if (predictor != 1) {
- pred = new StreamPredictor(this, predictor, columns, colors, bits);
- if (!pred->isOk()) {
- delete pred;
- pred = NULL;
- }
- } else {
- pred = NULL;
- }
- litCodeTab.codes = NULL;
- distCodeTab.codes = NULL;
-}
-
-FlateStream::~FlateStream() {
- if (litCodeTab.codes != fixedLitCodeTab.codes) {
- gfree(litCodeTab.codes);
- }
- if (distCodeTab.codes != fixedDistCodeTab.codes) {
- gfree(distCodeTab.codes);
- }
- if (pred) {
- delete pred;
- }
- delete str;
-}
-
-void FlateStream::reset() {
- int cmf, flg;
-
- index = 0;
- remain = 0;
- codeBuf = 0;
- codeSize = 0;
- compressedBlock = gFalse;
- endOfBlock = gTrue;
- eof = gTrue;
-
- str->reset();
-
- // read header
- //~ need to look at window size?
- endOfBlock = eof = gTrue;
- cmf = str->getChar();
- flg = str->getChar();
- if (cmf == EOF || flg == EOF)
- return;
- if ((cmf & 0x0f) != 0x08) {
- error(getPos(), "Unknown compression method in flate stream");
- return;
- }
- if ((((cmf << 8) + flg) % 31) != 0) {
- error(getPos(), "Bad FCHECK in flate stream");
- return;
- }
- if (flg & 0x20) {
- error(getPos(), "FDICT bit set in flate stream");
- return;
- }
-
- eof = gFalse;
-}
-
-int FlateStream::getChar() {
- int c;
-
- if (pred) {
- return pred->getChar();
- }
- while (remain == 0) {
- if (endOfBlock && eof)
- return EOF;
- readSome();
- }
- c = buf[index];
- index = (index + 1) & flateMask;
- --remain;
- return c;
-}
-
-int FlateStream::lookChar() {
- int c;
-
- if (pred) {
- return pred->lookChar();
- }
- while (remain == 0) {
- if (endOfBlock && eof)
- return EOF;
- readSome();
- }
- c = buf[index];
- return c;
-}
-
-int FlateStream::getRawChar() {
- int c;
-
- while (remain == 0) {
- if (endOfBlock && eof)
- return EOF;
- readSome();
- }
- c = buf[index];
- index = (index + 1) & flateMask;
- --remain;
- return c;
-}
-
-GString *FlateStream::getPSFilter(int psLevel, char *indent) {
- GString *s;
-
- if (psLevel < 3 || pred) {
- return NULL;
- }
- if (!(s = str->getPSFilter(psLevel, indent))) {
- return NULL;
- }
- s->append(indent)->append("<< >> /FlateDecode filter\n");
- return s;
-}
-
-GBool FlateStream::isBinary(GBool last) {
- return str->isBinary(gTrue);
-}
-
-void FlateStream::readSome() {
- int code1, code2;
- int len, dist;
- int i, j, k;
- int c;
-
- if (endOfBlock) {
- if (!startBlock())
- return;
- }
-
- if (compressedBlock) {
- if ((code1 = getHuffmanCodeWord(&litCodeTab)) == EOF)
- goto err;
- if (code1 < 256) {
- buf[index] = code1;
- remain = 1;
- } else if (code1 == 256) {
- endOfBlock = gTrue;
- remain = 0;
- } else {
- code1 -= 257;
- code2 = lengthDecode[code1].bits;
- if (code2 > 0 && (code2 = getCodeWord(code2)) == EOF)
- goto err;
- len = lengthDecode[code1].first + code2;
- if ((code1 = getHuffmanCodeWord(&distCodeTab)) == EOF)
- goto err;
- code2 = distDecode[code1].bits;
- if (code2 > 0 && (code2 = getCodeWord(code2)) == EOF)
- goto err;
- dist = distDecode[code1].first + code2;
- i = index;
- j = (index - dist) & flateMask;
- for (k = 0; k < len; ++k) {
- buf[i] = buf[j];
- i = (i + 1) & flateMask;
- j = (j + 1) & flateMask;
- }
- remain = len;
- }
-
- } else {
- len = (blockLen < flateWindow) ? blockLen : flateWindow;
- for (i = 0, j = index; i < len; ++i, j = (j + 1) & flateMask) {
- if ((c = str->getChar()) == EOF) {
- endOfBlock = eof = gTrue;
- break;
- }
- buf[j] = c & 0xff;
- }
- remain = i;
- blockLen -= len;
- if (blockLen == 0)
- endOfBlock = gTrue;
- }
-
- return;
-
-err:
- error(getPos(), "Unexpected end of file in flate stream");
- endOfBlock = eof = gTrue;
- remain = 0;
-}
-
-GBool FlateStream::startBlock() {
- int blockHdr;
- int c;
- int check;
-
- // free the code tables from the previous block
- if (litCodeTab.codes != fixedLitCodeTab.codes) {
- gfree(litCodeTab.codes);
- }
- litCodeTab.codes = NULL;
- if (distCodeTab.codes != fixedDistCodeTab.codes) {
- gfree(distCodeTab.codes);
- }
- distCodeTab.codes = NULL;
-
- // read block header
- blockHdr = getCodeWord(3);
- if (blockHdr & 1)
- eof = gTrue;
- blockHdr >>= 1;
-
- // uncompressed block
- if (blockHdr == 0) {
- compressedBlock = gFalse;
- if ((c = str->getChar()) == EOF)
- goto err;
- blockLen = c & 0xff;
- if ((c = str->getChar()) == EOF)
- goto err;
- blockLen |= (c & 0xff) << 8;
- if ((c = str->getChar()) == EOF)
- goto err;
- check = c & 0xff;
- if ((c = str->getChar()) == EOF)
- goto err;
- check |= (c & 0xff) << 8;
- if (check != (~blockLen & 0xffff))
- error(getPos(), "Bad uncompressed block length in flate stream");
- codeBuf = 0;
- codeSize = 0;
-
- // compressed block with fixed codes
- } else if (blockHdr == 1) {
- compressedBlock = gTrue;
- loadFixedCodes();
-
- // compressed block with dynamic codes
- } else if (blockHdr == 2) {
- compressedBlock = gTrue;
- if (!readDynamicCodes()) {
- goto err;
- }
-
- // unknown block type
- } else {
- goto err;
- }
-
- endOfBlock = gFalse;
- return gTrue;
-
-err:
- error(getPos(), "Bad block header in flate stream");
- endOfBlock = eof = gTrue;
- return gFalse;
-}
-
-void FlateStream::loadFixedCodes() {
- litCodeTab.codes = fixedLitCodeTab.codes;
- litCodeTab.maxLen = fixedLitCodeTab.maxLen;
- distCodeTab.codes = fixedDistCodeTab.codes;
- distCodeTab.maxLen = fixedDistCodeTab.maxLen;
-}
-
-GBool FlateStream::readDynamicCodes() {
- int numCodeLenCodes;
- int numLitCodes;
- int numDistCodes;
- int codeLenCodeLengths[flateMaxCodeLenCodes];
- FlateHuffmanTab codeLenCodeTab;
- int len, repeat, code;
- int i;
-
- codeLenCodeTab.codes = NULL;
-
- // read lengths
- if ((numLitCodes = getCodeWord(5)) == EOF) {
- goto err;
- }
- numLitCodes += 257;
- if ((numDistCodes = getCodeWord(5)) == EOF) {
- goto err;
- }
- numDistCodes += 1;
- if ((numCodeLenCodes = getCodeWord(4)) == EOF) {
- goto err;
- }
- numCodeLenCodes += 4;
- if (numLitCodes > flateMaxLitCodes ||
- numDistCodes > flateMaxDistCodes ||
- numCodeLenCodes > flateMaxCodeLenCodes) {
- goto err;
- }
-
- // build the code length code table
- for (i = 0; i < flateMaxCodeLenCodes; ++i) {
- codeLenCodeLengths[i] = 0;
- }
- for (i = 0; i < numCodeLenCodes; ++i) {
- if ((codeLenCodeLengths[codeLenCodeMap[i]] = getCodeWord(3)) == -1) {
- goto err;
- }
- }
- compHuffmanCodes(codeLenCodeLengths, flateMaxCodeLenCodes, &codeLenCodeTab);
-
- // build the literal and distance code tables
- len = 0;
- repeat = 0;
- i = 0;
- while (i < numLitCodes + numDistCodes) {
- if ((code = getHuffmanCodeWord(&codeLenCodeTab)) == EOF) {
- goto err;
- }
- if (code == 16) {
- if ((repeat = getCodeWord(2)) == EOF) {
- goto err;
- }
- repeat += 3;
- if (i + repeat > numLitCodes + numDistCodes) {
- goto err;
- }
- for (; repeat > 0; --repeat) {
- codeLengths[i++] = len;
- }
- } else if (code == 17) {
- if ((repeat = getCodeWord(3)) == EOF) {
- goto err;
- }
- repeat += 3;
- if (i + repeat > numLitCodes + numDistCodes) {
- goto err;
- }
- len = 0;
- for (; repeat > 0; --repeat) {
- codeLengths[i++] = 0;
- }
- } else if (code == 18) {
- if ((repeat = getCodeWord(7)) == EOF) {
- goto err;
- }
- repeat += 11;
- if (i + repeat > numLitCodes + numDistCodes) {
- goto err;
- }
- len = 0;
- for (; repeat > 0; --repeat) {
- codeLengths[i++] = 0;
- }
- } else {
- codeLengths[i++] = len = code;
- }
- }
- compHuffmanCodes(codeLengths, numLitCodes, &litCodeTab);
- compHuffmanCodes(codeLengths + numLitCodes, numDistCodes, &distCodeTab);
-
- gfree(codeLenCodeTab.codes);
- return gTrue;
-
-err:
- error(getPos(), "Bad dynamic code table in flate stream");
- gfree(codeLenCodeTab.codes);
- return gFalse;
-}
-
-// Convert an array <lengths> of <n> lengths, in value order, into a
-// Huffman code lookup table.
-void FlateStream::compHuffmanCodes(int *lengths, int n, FlateHuffmanTab *tab) {
- int tabSize, len, code, code2, skip, val, i, t;
-
- // find max code length
- tab->maxLen = 0;
- for (val = 0; val < n; ++val) {
- if (lengths[val] > tab->maxLen) {
- tab->maxLen = lengths[val];
- }
- }
-
- // allocate the table
- tabSize = 1 << tab->maxLen;
- tab->codes = (FlateCode *)gmallocn(tabSize, sizeof(FlateCode));
-
- // clear the table
- for (i = 0; i < tabSize; ++i) {
- tab->codes[i].len = 0;
- tab->codes[i].val = 0;
- }
-
- // build the table
- for (len = 1, code = 0, skip = 2;
- len <= tab->maxLen;
- ++len, code <<= 1, skip <<= 1) {
- for (val = 0; val < n; ++val) {
- if (lengths[val] == len) {
-
- // bit-reverse the code
- code2 = 0;
- t = code;
- for (i = 0; i < len; ++i) {
- code2 = (code2 << 1) | (t & 1);
- t >>= 1;
- }
-
- // fill in the table entries
- for (i = code2; i < tabSize; i += skip) {
- tab->codes[i].len = (Gushort)len;
- tab->codes[i].val = (Gushort)val;
- }
-
- ++code;
- }
- }
- }
-}
-
-int FlateStream::getHuffmanCodeWord(FlateHuffmanTab *tab) {
- FlateCode *code;
- int c;
-
- while (codeSize < tab->maxLen) {
- if ((c = str->getChar()) == EOF) {
- break;
- }
- codeBuf |= (c & 0xff) << codeSize;
- codeSize += 8;
- }
- code = &tab->codes[codeBuf & ((1 << tab->maxLen) - 1)];
- if (codeSize == 0 || codeSize < code->len || code->len == 0) {
- return EOF;
- }
- codeBuf >>= code->len;
- codeSize -= code->len;
- return (int)code->val;
-}
-
-int FlateStream::getCodeWord(int bits) {
- int c;
-
- while (codeSize < bits) {
- if ((c = str->getChar()) == EOF)
- return EOF;
- codeBuf |= (c & 0xff) << codeSize;
- codeSize += 8;
- }
- c = codeBuf & ((1 << bits) - 1);
- codeBuf >>= bits;
- codeSize -= bits;
- return c;
-}
-
-//------------------------------------------------------------------------
-// EOFStream
-//------------------------------------------------------------------------
-
-EOFStream::EOFStream(Stream *strA):
- FilterStream(strA) {
-}
-
-EOFStream::~EOFStream() {
- delete str;
-}
-
-//------------------------------------------------------------------------
-// FixedLengthEncoder
-//------------------------------------------------------------------------
-
-FixedLengthEncoder::FixedLengthEncoder(Stream *strA, int lengthA):
- FilterStream(strA) {
- length = lengthA;
- count = 0;
-}
-
-FixedLengthEncoder::~FixedLengthEncoder() {
- if (str->isEncoder())
- delete str;
-}
-
-void FixedLengthEncoder::reset() {
- str->reset();
- count = 0;
-}
-
-int FixedLengthEncoder::getChar() {
- if (length >= 0 && count >= length)
- return EOF;
- ++count;
- return str->getChar();
-}
-
-int FixedLengthEncoder::lookChar() {
- if (length >= 0 && count >= length)
- return EOF;
- return str->getChar();
-}
-
-GBool FixedLengthEncoder::isBinary(GBool last) {
- return str->isBinary(gTrue);
-}
-
-//------------------------------------------------------------------------
-// ASCIIHexEncoder
-//------------------------------------------------------------------------
-
-ASCIIHexEncoder::ASCIIHexEncoder(Stream *strA):
- FilterStream(strA) {
- bufPtr = bufEnd = buf;
- lineLen = 0;
- eof = gFalse;
-}
-
-ASCIIHexEncoder::~ASCIIHexEncoder() {
- if (str->isEncoder()) {
- delete str;
- }
-}
-
-void ASCIIHexEncoder::reset() {
- str->reset();
- bufPtr = bufEnd = buf;
- lineLen = 0;
- eof = gFalse;
-}
-
-GBool ASCIIHexEncoder::fillBuf() {
- static char *hex = "0123456789abcdef";
- int c;
-
- if (eof) {
- return gFalse;
- }
- bufPtr = bufEnd = buf;
- if ((c = str->getChar()) == EOF) {
- *bufEnd++ = '>';
- eof = gTrue;
- } else {
- if (lineLen >= 64) {
- *bufEnd++ = '\n';
- lineLen = 0;
- }
- *bufEnd++ = hex[(c >> 4) & 0x0f];
- *bufEnd++ = hex[c & 0x0f];
- lineLen += 2;
- }
- return gTrue;
-}
-
-//------------------------------------------------------------------------
-// ASCII85Encoder
-//------------------------------------------------------------------------
-
-ASCII85Encoder::ASCII85Encoder(Stream *strA):
- FilterStream(strA) {
- bufPtr = bufEnd = buf;
- lineLen = 0;
- eof = gFalse;
-}
-
-ASCII85Encoder::~ASCII85Encoder() {
- if (str->isEncoder())
- delete str;
-}
-
-void ASCII85Encoder::reset() {
- str->reset();
- bufPtr = bufEnd = buf;
- lineLen = 0;
- eof = gFalse;
-}
-
-GBool ASCII85Encoder::fillBuf() {
- Gulong t;
- char buf1[5];
- int c;
- int n, i;
-
- if (eof)
- return gFalse;
- t = 0;
- for (n = 0; n < 4; ++n) {
- if ((c = str->getChar()) == EOF)
- break;
- t = (t << 8) + c;
- }
- bufPtr = bufEnd = buf;
- if (n > 0) {
- if (n == 4 && t == 0) {
- *bufEnd++ = 'z';
- if (++lineLen == 65) {
- *bufEnd++ = '\n';
- lineLen = 0;
- }
- } else {
- if (n < 4)
- t <<= 8 * (4 - n);
- for (i = 4; i >= 0; --i) {
- buf1[i] = (char)(t % 85 + 0x21);
- t /= 85;
- }
- for (i = 0; i <= n; ++i) {
- *bufEnd++ = buf1[i];
- if (++lineLen == 65) {
- *bufEnd++ = '\n';
- lineLen = 0;
- }
- }
- }
- }
- if (n < 4) {
- *bufEnd++ = '~';
- *bufEnd++ = '>';
- eof = gTrue;
- }
- return bufPtr < bufEnd;
-}
-
-//------------------------------------------------------------------------
-// RunLengthEncoder
-//------------------------------------------------------------------------
-
-RunLengthEncoder::RunLengthEncoder(Stream *strA):
- FilterStream(strA) {
- bufPtr = bufEnd = nextEnd = buf;
- eof = gFalse;
-}
-
-RunLengthEncoder::~RunLengthEncoder() {
- if (str->isEncoder())
- delete str;
-}
-
-void RunLengthEncoder::reset() {
- str->reset();
- bufPtr = bufEnd = nextEnd = buf;
- eof = gFalse;
-}
-
-//
-// When fillBuf finishes, buf[] looks like this:
-// +-----+--------------+-----------------+--
-// + tag | ... data ... | next 0, 1, or 2 |
-// +-----+--------------+-----------------+--
-// ^ ^ ^
-// bufPtr bufEnd nextEnd
-//
-GBool RunLengthEncoder::fillBuf() {
- int c, c1, c2;
- int n;
-
- // already hit EOF?
- if (eof)
- return gFalse;
-
- // grab two bytes
- if (nextEnd < bufEnd + 1) {
- if ((c1 = str->getChar()) == EOF) {
- eof = gTrue;
- return gFalse;
- }
- } else {
- c1 = bufEnd[0] & 0xff;
- }
- if (nextEnd < bufEnd + 2) {
- if ((c2 = str->getChar()) == EOF) {
- eof = gTrue;
- buf[0] = 0;
- buf[1] = c1;
- bufPtr = buf;
- bufEnd = &buf[2];
- return gTrue;
- }
- } else {
- c2 = bufEnd[1] & 0xff;
- }
-
- // check for repeat
- c = 0; // make gcc happy
- if (c1 == c2) {
- n = 2;
- while (n < 128 && (c = str->getChar()) == c1)
- ++n;
- buf[0] = (char)(257 - n);
- buf[1] = c1;
- bufEnd = &buf[2];
- if (c == EOF) {
- eof = gTrue;
- } else if (n < 128) {
- buf[2] = c;
- nextEnd = &buf[3];
- } else {
- nextEnd = bufEnd;
- }
-
- // get up to 128 chars
- } else {
- buf[1] = c1;
- buf[2] = c2;
- n = 2;
- while (n < 128) {
- if ((c = str->getChar()) == EOF) {
- eof = gTrue;
- break;
- }
- ++n;
- buf[n] = c;
- if (buf[n] == buf[n-1])
- break;
- }
- if (buf[n] == buf[n-1]) {
- buf[0] = (char)(n-2-1);
- bufEnd = &buf[n-1];
- nextEnd = &buf[n+1];
- } else {
- buf[0] = (char)(n-1);
- bufEnd = nextEnd = &buf[n+1];
- }
- }
- bufPtr = buf;
- return gTrue;
-}
git.asbjorn.biz / swftools.git / blobdiff