X-Git-Url: http://git.asbjorn.biz/?p=swftools.git;a=blobdiff_plain;f=pdf2swf%2Fxpdf%2FJArithmeticDecoder.cc;fp=pdf2swf%2Fxpdf%2FJArithmeticDecoder.cc;h=0000000000000000000000000000000000000000;hp=195b73e1c24280b37a751a6604c3cc78f1e53a41;hb=5a005ef586b9000810156a961b9622c903dce988;hpb=c26ca847941ca0acfc9f3b4bdc519d904ba09a39 diff --git a/pdf2swf/xpdf/JArithmeticDecoder.cc b/pdf2swf/xpdf/JArithmeticDecoder.cc deleted file mode 100644 index 195b73e..0000000 --- a/pdf2swf/xpdf/JArithmeticDecoder.cc +++ /dev/null @@ -1,322 +0,0 @@ -//======================================================================== -// -// JArithmeticDecoder.cc -// -// Copyright 2002-2004 Glyph & Cog, LLC -// -//======================================================================== - -#include - -#ifdef USE_GCC_PRAGMAS -#pragma implementation -#endif - -#include "Object.h" -#include "Stream.h" -#include "JArithmeticDecoder.h" - -//------------------------------------------------------------------------ -// JArithmeticDecoderStates -//------------------------------------------------------------------------ - -JArithmeticDecoderStats::JArithmeticDecoderStats(int contextSizeA) { - contextSize = contextSizeA; - cxTab = (Guchar *)gmallocn(contextSize, sizeof(Guchar)); - reset(); -} - -JArithmeticDecoderStats::~JArithmeticDecoderStats() { - gfree(cxTab); -} - -JArithmeticDecoderStats *JArithmeticDecoderStats::copy() { - JArithmeticDecoderStats *stats; - - stats = new JArithmeticDecoderStats(contextSize); - memcpy(stats->cxTab, cxTab, contextSize); - return stats; -} - -void JArithmeticDecoderStats::reset() { - memset(cxTab, 0, contextSize); -} - -void JArithmeticDecoderStats::copyFrom(JArithmeticDecoderStats *stats) { - memcpy(cxTab, stats->cxTab, contextSize); -} - -void JArithmeticDecoderStats::setEntry(Guint cx, int i, int mps) { - cxTab[cx] = (i << 1) + mps; -} - -//------------------------------------------------------------------------ -// JArithmeticDecoder -//------------------------------------------------------------------------ - -Guint JArithmeticDecoder::qeTab[47] = { - 0x56010000, 0x34010000, 0x18010000, 0x0AC10000, - 0x05210000, 0x02210000, 0x56010000, 0x54010000, - 0x48010000, 0x38010000, 0x30010000, 0x24010000, - 0x1C010000, 0x16010000, 0x56010000, 0x54010000, - 0x51010000, 0x48010000, 0x38010000, 0x34010000, - 0x30010000, 0x28010000, 0x24010000, 0x22010000, - 0x1C010000, 0x18010000, 0x16010000, 0x14010000, - 0x12010000, 0x11010000, 0x0AC10000, 0x09C10000, - 0x08A10000, 0x05210000, 0x04410000, 0x02A10000, - 0x02210000, 0x01410000, 0x01110000, 0x00850000, - 0x00490000, 0x00250000, 0x00150000, 0x00090000, - 0x00050000, 0x00010000, 0x56010000 -}; - -int JArithmeticDecoder::nmpsTab[47] = { - 1, 2, 3, 4, 5, 38, 7, 8, 9, 10, 11, 12, 13, 29, 15, 16, - 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, - 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 45, 46 -}; - -int JArithmeticDecoder::nlpsTab[47] = { - 1, 6, 9, 12, 29, 33, 6, 14, 14, 14, 17, 18, 20, 21, 14, 14, - 15, 16, 17, 18, 19, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, - 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 46 -}; - -int JArithmeticDecoder::switchTab[47] = { - 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 -}; - -JArithmeticDecoder::JArithmeticDecoder() { - str = NULL; - dataLen = 0; - limitStream = gFalse; -} - -inline Guint JArithmeticDecoder::readByte() { - if (limitStream) { - --dataLen; - if (dataLen < 0) { - return 0xff; - } - } - return (Guint)str->getChar() & 0xff; -} - -JArithmeticDecoder::~JArithmeticDecoder() { - cleanup(); -} - -void JArithmeticDecoder::start() { - buf0 = readByte(); - buf1 = readByte(); - - // INITDEC - c = (buf0 ^ 0xff) << 16; - byteIn(); - c <<= 7; - ct -= 7; - a = 0x80000000; -} - -void JArithmeticDecoder::restart(int dataLenA) { - int oldDataLen; - - oldDataLen = dataLen; - dataLen = dataLenA; - if (oldDataLen == -1) { - buf1 = readByte(); - } else if (oldDataLen <= -2) { - buf0 = readByte(); - buf1 = readByte(); - } -} - -void JArithmeticDecoder::cleanup() { - if (limitStream) { - while (dataLen > 0) { - buf0 = buf1; - buf1 = readByte(); - } - } -} - -int JArithmeticDecoder::decodeBit(Guint context, - JArithmeticDecoderStats *stats) { - int bit; - Guint qe; - int iCX, mpsCX; - - iCX = stats->cxTab[context] >> 1; - mpsCX = stats->cxTab[context] & 1; - qe = qeTab[iCX]; - a -= qe; - if (c < a) { - if (a & 0x80000000) { - bit = mpsCX; - } else { - // MPS_EXCHANGE - if (a < qe) { - bit = 1 - mpsCX; - if (switchTab[iCX]) { - stats->cxTab[context] = (nlpsTab[iCX] << 1) | (1 - mpsCX); - } else { - stats->cxTab[context] = (nlpsTab[iCX] << 1) | mpsCX; - } - } else { - bit = mpsCX; - stats->cxTab[context] = (nmpsTab[iCX] << 1) | mpsCX; - } - // RENORMD - do { - if (ct == 0) { - byteIn(); - } - a <<= 1; - c <<= 1; - --ct; - } while (!(a & 0x80000000)); - } - } else { - c -= a; - // LPS_EXCHANGE - if (a < qe) { - bit = mpsCX; - stats->cxTab[context] = (nmpsTab[iCX] << 1) | mpsCX; - } else { - bit = 1 - mpsCX; - if (switchTab[iCX]) { - stats->cxTab[context] = (nlpsTab[iCX] << 1) | (1 - mpsCX); - } else { - stats->cxTab[context] = (nlpsTab[iCX] << 1) | mpsCX; - } - } - a = qe; - // RENORMD - do { - if (ct == 0) { - byteIn(); - } - a <<= 1; - c <<= 1; - --ct; - } while (!(a & 0x80000000)); - } - return bit; -} - -int JArithmeticDecoder::decodeByte(Guint context, - JArithmeticDecoderStats *stats) { - int byte; - int i; - - byte = 0; - for (i = 0; i < 8; ++i) { - byte = (byte << 1) | decodeBit(context, stats); - } - return byte; -} - -GBool JArithmeticDecoder::decodeInt(int *x, JArithmeticDecoderStats *stats) { - int s; - Guint v; - int i; - - prev = 1; - s = decodeIntBit(stats); - if (decodeIntBit(stats)) { - if (decodeIntBit(stats)) { - if (decodeIntBit(stats)) { - if (decodeIntBit(stats)) { - if (decodeIntBit(stats)) { - v = 0; - for (i = 0; i < 32; ++i) { - v = (v << 1) | decodeIntBit(stats); - } - v += 4436; - } else { - v = 0; - for (i = 0; i < 12; ++i) { - v = (v << 1) | decodeIntBit(stats); - } - v += 340; - } - } else { - v = 0; - for (i = 0; i < 8; ++i) { - v = (v << 1) | decodeIntBit(stats); - } - v += 84; - } - } else { - v = 0; - for (i = 0; i < 6; ++i) { - v = (v << 1) | decodeIntBit(stats); - } - v += 20; - } - } else { - v = decodeIntBit(stats); - v = (v << 1) | decodeIntBit(stats); - v = (v << 1) | decodeIntBit(stats); - v = (v << 1) | decodeIntBit(stats); - v += 4; - } - } else { - v = decodeIntBit(stats); - v = (v << 1) | decodeIntBit(stats); - } - - if (s) { - if (v == 0) { - return gFalse; - } - *x = -(int)v; - } else { - *x = (int)v; - } - return gTrue; -} - -int JArithmeticDecoder::decodeIntBit(JArithmeticDecoderStats *stats) { - int bit; - - bit = decodeBit(prev, stats); - if (prev < 0x100) { - prev = (prev << 1) | bit; - } else { - prev = (((prev << 1) | bit) & 0x1ff) | 0x100; - } - return bit; -} - -Guint JArithmeticDecoder::decodeIAID(Guint codeLen, - JArithmeticDecoderStats *stats) { - Guint i; - int bit; - - prev = 1; - for (i = 0; i < codeLen; ++i) { - bit = decodeBit(prev, stats); - prev = (prev << 1) | bit; - } - return prev - (1 << codeLen); -} - -void JArithmeticDecoder::byteIn() { - if (buf0 == 0xff) { - if (buf1 > 0x8f) { - ct = 8; - } else { - buf0 = buf1; - buf1 = readByte(); - c = c + 0xfe00 - (buf0 << 9); - ct = 7; - } - } else { - buf0 = buf1; - buf1 = readByte(); - c = c + 0xff00 - (buf0 << 8); - ct = 8; - } -}