lib/bitio.c

   1 /*  bitio.c
   2     part of swftools
   3     implementation of bitio.h.
   4
   5     Copyright (C) 2003 Matthias Kramm <kramm@quiss.org>
   6
   7     This program is free software; you can redistribute it and/or modify
   8     it under the terms of the GNU General Public License as published by
   9     the Free Software Foundation; either version 2 of the License, or
  10     (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #ifdef HAVE_UNISTD_H
  24 #include <unistd.h>
  25 #endif
  26 #ifdef HAVE_IO_H
  27 #include <io.h>
  28 #endif
  29 #include <string.h>
  30 #include <memory.h>
  31 #include <fcntl.h>
  32
  33 #include "../config.h"
  34
  35 #ifdef HAVE_ZLIB
  36 #include <zlib.h>
  37 #define ZLIB_BUFFER_SIZE 16384
  38 #endif
  39 #include "./bitio.h"
  40
  41 /* ---------------------------- null reader ------------------------------- */
  42
  43 static int reader_nullread(reader_t*r, void* data, int len)
  44 {
  45     memset(data, 0, len);
  46     return len;
  47 }
  48 static void reader_nullread_dealloc(reader_t*r)
  49 {
  50     memset(r, 0, sizeof(reader_t));
  51 }
  52 void reader_init_nullreader(reader_t*r)
  53 {
  54     r->read = reader_nullread;
  55     r->dealloc = reader_nullread_dealloc;
  56     r->internal = 0;
  57     r->type = READER_TYPE_NULL;
  58     r->mybyte = 0;
  59     r->bitpos = 8;
  60     r->pos = 0;
  61 }
  62 /* ---------------------------- file reader ------------------------------- */
  63
  64 static int reader_fileread(reader_t*reader, void* data, int len)
  65 {
  66     int ret = read((int)reader->internal, data, len);
  67     if(ret>=0)
  68         reader->pos += ret;
  69     return ret;
  70 }
  71 void reader_init_filereader(reader_t*r, int handle)
  72 {
  73     r->read = reader_fileread;
  74     r->internal = (void*)handle;
  75     r->type = READER_TYPE_FILE;
  76     r->mybyte = 0;
  77     r->bitpos = 8;
  78     r->pos = 0;
  79 }
  80
  81 /* ---------------------------- mem reader ------------------------------- */
  82
  83 struct memread_t
  84 {
  85     unsigned char*data;
  86     int length;
  87 };
  88 static int reader_memread(reader_t*reader, void* data, int len)
  89 {
  90     struct memread_t*mr = (struct memread_t*)reader->internal;
  91
  92     if(mr->length - reader->pos > len) {
  93         memcpy(data, &mr->data[reader->pos], len);
  94         reader->pos += len;
  95         return len;
  96     } else {
  97         memcpy(data, &mr->data[reader->pos], mr->length - reader->pos);
  98         reader->pos += mr->length;
  99         return mr->length - reader->pos;
 100     }
 101 }
 102 static void reader_memread_dealloc(reader_t*reader)
 103 {
 104     if(reader->internal)
 105         free(reader->internal);
 106     memset(reader, 0, sizeof(reader_t));
 107 }
 108 void reader_init_memreader(reader_t*r, void*newdata, int newlength)
 109 {
 110     struct memread_t*mr = (struct memread_t*)malloc(sizeof(struct memread_t));
 111     mr->data = (unsigned char*)newdata;
 112     mr->length = newlength;
 113     r->read = reader_memread;
 114     r->dealloc = reader_memread_dealloc;
 115     r->internal = (void*)mr;
 116     r->type = READER_TYPE_MEM;
 117     r->mybyte = 0;
 118     r->bitpos = 8;
 119     r->pos = 0;
 120 }
 121
 122 /* ---------------------------- mem writer ------------------------------- */
 123
 124 struct memwrite_t
 125 {
 126     unsigned char*data;
 127     int length;
 128 };
 129
 130 static int writer_memwrite_write(writer_t*w, void* data, int len)
 131 {
 132     struct memwrite_t*mw = (struct memwrite_t*)w->internal;
 133     if(mw->length - w->pos > len) {
 134         memcpy(&mw->data[w->pos], data, len);
 135         w->pos += len;
 136         return len;
 137     } else {
 138         memcpy(&mw->data[w->pos], data, mw->length - w->pos);
 139         w->pos = mw->length;
 140         return mw->length - w->pos;
 141     }
 142 }
 143 static void writer_memwrite_finish(writer_t*w)
 144 {
 145     if(w->internal)
 146         free(w->internal);
 147     w->internal = 0;
 148 }
 149 void writer_init_memwriter(writer_t*w, void*data, int len)
 150 {
 151     struct memwrite_t *mr;
 152     mr = (struct memwrite_t*)malloc(sizeof(struct memwrite_t));
 153     mr->data = (unsigned char *)data;
 154     mr->length = len;
 155     memset(w, 0, sizeof(writer_t));
 156     w->write = writer_memwrite_write;
 157     w->finish = writer_memwrite_finish;
 158     w->internal = (void*)mr;
 159     w->type = WRITER_TYPE_MEM;
 160     w->bitpos = 0;
 161     w->mybyte = 0;
 162     w->pos = 0;
 163 }
 164
 165 /* ------------------------- growing mem writer ------------------------------- */
 166
 167 struct growmemwrite_t
 168 {
 169     unsigned char*data;
 170     int length;
 171     U32 grow;
 172 };
 173 static int writer_growmemwrite_write(writer_t*w, void* data, int len)
 174 {
 175     struct growmemwrite_t*mw = (struct growmemwrite_t*)w->internal;
 176     if(!mw->data) {
 177         fprintf(stderr, "Illegal write operation: data already given away");
 178         exit(1);
 179     }
 180     if(mw->length - w->pos < len) {
 181         int newlength = mw->length;
 182         while(newlength - w->pos < len) {
 183             newlength += mw->grow;
 184         }
 185 #ifdef NO_REALLOC
 186         unsigned char*newmem = (unsigned char*)malloc(newlength);
 187         memcpy(newmem, mw->data, mw->length);
 188         free(mw->data);
 189         mw->data = newmem;
 190 #else
 191         mw->data = (unsigned char*)realloc(mw->data, newlength);
 192 #endif
 193         mw->length = newlength;
 194     }
 195     memcpy(&mw->data[w->pos], data, len);
 196     w->pos += len;
 197     return len;
 198 }
 199 static void writer_growmemwrite_finish(writer_t*w)
 200 {
 201     struct growmemwrite_t*mw = (struct growmemwrite_t*)w->internal;
 202     if(mw->data)
 203         free(mw->data);
 204     mw->data = 0;
 205     mw->length = 0;
 206     free(w->internal);mw=0;
 207     memset(w, 0, sizeof(writer_t));
 208 }
 209 void* writer_growmemwrite_getmem(writer_t*w)
 210 {
 211     struct growmemwrite_t*mw = (struct growmemwrite_t*)w->internal;
 212     void*ret = mw->data;
 213     /* remove own reference so that neither write() nor finish() can free it.
 214        It's property of the caller now.
 215     */
 216     mw->data = 0;
 217     return ret;
 218 }
 219 void writer_init_growingmemwriter(writer_t*w, U32 grow)
 220 {
 221     struct growmemwrite_t *mr;
 222     mr = (struct growmemwrite_t *)malloc(sizeof(struct growmemwrite_t));
 223     mr->length = 4096;
 224     mr->data = (unsigned char *)malloc(mr->length);
 225     mr->grow = grow;
 226     memset(w, 0, sizeof(writer_t));
 227     w->write = writer_growmemwrite_write;
 228     w->finish = writer_growmemwrite_finish;
 229     w->internal = (void*)mr;
 230     w->type = WRITER_TYPE_GROWING_MEM;
 231     w->bitpos = 0;
 232     w->mybyte = 0;
 233     w->pos = 0;
 234 }
 235
 236 /* ---------------------------- file writer ------------------------------- */
 237
 238 struct filewrite_t
 239 {
 240     int handle;
 241     char free_handle;
 242 };
 243
 244 static int writer_filewrite_write(writer_t*w, void* data, int len)
 245 {
 246     struct filewrite_t * fw= (struct filewrite_t*)w->internal;
 247     return write(fw->handle, data, len);
 248 }
 249 static void writer_filewrite_finish(writer_t*w)
 250 {
 251     struct filewrite_t *mr = (struct filewrite_t*)w->internal;
 252     if(mr->free_handle)
 253         close(mr->handle);
 254     free(w->internal);
 255     memset(w, 0, sizeof(writer_t));
 256 }
 257 void writer_init_filewriter(writer_t*w, int handle)
 258 {
 259     struct filewrite_t *mr = (struct filewrite_t *)malloc(sizeof(struct filewrite_t));
 260     mr->handle = handle;
 261     mr->free_handle = 0;
 262     memset(w, 0, sizeof(writer_t));
 263     w->write = writer_filewrite_write;
 264     w->finish = writer_filewrite_finish;
 265     w->internal = mr;
 266     w->type = WRITER_TYPE_FILE;
 267     w->bitpos = 0;
 268     w->mybyte = 0;
 269     w->pos = 0;
 270 }
 271 void writer_init_filewriter2(writer_t*w, char*filename)
 272 {
 273     int fi = open("movie.swf",
 274 #ifdef O_BINARY
 275             O_BINARY|
 276 #endif
 277             O_WRONLY|O_CREAT|O_TRUNC, 0644);
 278     writer_init_filewriter(w, fi);
 279     ((struct filewrite_t*)w->internal)->free_handle = 1;
 280 }
 281
 282 /* ---------------------------- null writer ------------------------------- */
 283
 284 static int writer_nullwrite_write(writer_t*w, void* data, int len)
 285 {
 286     w->pos += len;
 287     return len;
 288 }
 289 static void writer_nullwrite_finish(writer_t*w)
 290 {
 291     memset(w, 0, sizeof(writer_t));
 292 }
 293 void writer_init_nullwriter(writer_t*w)
 294 {
 295     memset(w, 0, sizeof(writer_t));
 296     w->write = writer_nullwrite_write;
 297     w->finish = writer_nullwrite_finish;
 298     w->internal = 0;
 299     w->type = WRITER_TYPE_NULL;
 300     w->bitpos = 0;
 301     w->mybyte = 0;
 302     w->pos = 0;
 303 }
 304 /* ---------------------------- zlibinflate reader -------------------------- */
 305
 306 struct zlibinflate_t
 307 {
 308 #ifdef HAVE_ZLIB
 309     z_stream zs;
 310     reader_t*input;
 311     unsigned char readbuffer[ZLIB_BUFFER_SIZE];
 312 #endif
 313 };
 314
 315 #ifdef HAVE_ZLIB
 316 static void zlib_error(int ret, char* msg, z_stream*zs)
 317 {
 318     fprintf(stderr, "%s: zlib error (%d): last zlib error: %s\n",
 319           msg,
 320           ret,
 321           zs->msg?zs->msg:"unknown");
 322     perror("errno:");
 323     exit(1);
 324 }
 325 #endif
 326
 327 static int reader_zlibinflate(reader_t*reader, void* data, int len)
 328 {
 329 #ifdef HAVE_ZLIB
 330     struct zlibinflate_t*z = (struct zlibinflate_t*)reader->internal;
 331     int ret;
 332     if(!z) {
 333         return 0;
 334     }
 335     if(!len)
 336         return 0;
 337
 338     z->zs.next_out = (Bytef *)data;
 339     z->zs.avail_out = len;
 340
 341     while(1) {
 342         if(!z->zs.avail_in) {
 343             z->zs.avail_in = z->input->read(z->input, z->readbuffer, ZLIB_BUFFER_SIZE);
 344             z->zs.next_in = z->readbuffer;
 345         }
 346         if(z->zs.avail_in)
 347             ret = inflate(&z->zs, Z_NO_FLUSH);
 348         else
 349             ret = inflate(&z->zs, Z_FINISH);
 350
 351         if (ret != Z_OK &&
 352             ret != Z_STREAM_END) zlib_error(ret, "bitio:inflate_inflate", &z->zs);
 353
 354         if (ret == Z_STREAM_END) {
 355                 int pos = z->zs.next_out - (Bytef*)data;
 356                 ret = inflateEnd(&z->zs);
 357                 if (ret != Z_OK) zlib_error(ret, "bitio:inflate_end", &z->zs);
 358                 free(reader->internal);
 359                 reader->internal = 0;
 360                 reader->pos += pos;
 361                 return pos;
 362         }
 363         if(!z->zs.avail_out) {
 364             break;
 365         }
 366     }
 367     reader->pos += len;
 368     return len;
 369 #else
 370     fprintf(stderr, "Error: swftools was compiled without zlib support");
 371     exit(1);
 372 #endif
 373 }
 374 static void reader_zlibinflate_dealloc(reader_t*reader)
 375 {
 376 #ifdef HAVE_ZLIB
 377     struct zlibinflate_t*z = (struct zlibinflate_t*)reader->internal;
 378     /* test whether read() already did basic deallocation */
 379     if(reader->internal) {
 380         inflateEnd(&z->zs);
 381         free(reader->internal);
 382     }
 383     memset(reader, 0, sizeof(reader_t));
 384 #endif
 385 }
 386 void reader_init_zlibinflate(reader_t*r, reader_t*input)
 387 {
 388 #ifdef HAVE_ZLIB
 389     struct zlibinflate_t*z;
 390     int ret;
 391     memset(r, 0, sizeof(reader_t));
 392     z = (struct zlibinflate_t*)malloc(sizeof(struct zlibinflate_t));
 393     memset(z, 0, sizeof(struct zlibinflate_t));
 394     r->internal = z;
 395     r->read = reader_zlibinflate;
 396     r->dealloc = reader_zlibinflate_dealloc;
 397     r->type = READER_TYPE_ZLIB;
 398     r->pos = 0;
 399     z->input = input;
 400     memset(&z->zs,0,sizeof(z_stream));
 401     z->zs.zalloc = Z_NULL;
 402     z->zs.zfree  = Z_NULL;
 403     z->zs.opaque = Z_NULL;
 404     ret = inflateInit(&z->zs);
 405     if (ret != Z_OK) zlib_error(ret, "bitio:inflate_init", &z->zs);
 406     reader_resetbits(r);
 407 #else
 408     fprintf(stderr, "Error: swftools was compiled without zlib support");
 409     exit(1);
 410 #endif
 411 }
 412
 413 /* ---------------------------- zlibdeflate writer -------------------------- */
 414
 415 struct zlibdeflate_t
 416 {
 417 #ifdef HAVE_ZLIB
 418     z_stream zs;
 419     writer_t*output;
 420     unsigned char writebuffer[ZLIB_BUFFER_SIZE];
 421 #endif
 422 };
 423
 424 static int writer_zlibdeflate_write(writer_t*writer, void* data, int len)
 425 {
 426 #ifdef HAVE_ZLIB
 427     struct zlibdeflate_t*z = (struct zlibdeflate_t*)writer->internal;
 428     int ret;
 429     if(writer->type != WRITER_TYPE_ZLIB) {
 430         fprintf(stderr, "Wrong writer ID (writer not initialized?)\n");
 431         return 0;
 432     }
 433     if(!z) {
 434         fprintf(stderr, "zlib not initialized!\n");
 435         return 0;
 436     }
 437     if(!len)
 438         return 0;
 439
 440     z->zs.next_in = (Bytef *)data;
 441     z->zs.avail_in = len;
 442
 443     while(1) {
 444         ret = deflate(&z->zs, Z_NO_FLUSH);
 445
 446         if (ret != Z_OK) zlib_error(ret, "bitio:deflate_deflate", &z->zs);
 447
 448         if(z->zs.next_out != z->writebuffer) {
 449             z->output->write(z->output, z->writebuffer, z->zs.next_out - (Bytef*)z->writebuffer);
 450             z->zs.next_out = z->writebuffer;
 451             z->zs.avail_out = ZLIB_BUFFER_SIZE;
 452         }
 453
 454         if(!z->zs.avail_in) {
 455             break;
 456         }
 457     }
 458     writer->pos += len;
 459     return len;
 460 #else
 461     fprintf(stderr, "Error: swftools was compiled without zlib support");
 462     exit(1);
 463 #endif
 464 }
 465 static void writer_zlibdeflate_finish(writer_t*writer)
 466 {
 467 #ifdef HAVE_ZLIB
 468     struct zlibdeflate_t*z = (struct zlibdeflate_t*)writer->internal;
 469     writer_t*output;
 470     int ret;
 471     if(writer->type != WRITER_TYPE_ZLIB) {
 472         fprintf(stderr, "Wrong writer ID (writer not initialized?)\n");
 473         return;
 474     }
 475     if(!z)
 476         return;
 477     output= z->output;
 478     while(1) {
 479         ret = deflate(&z->zs, Z_FINISH);
 480         if (ret != Z_OK &&
 481             ret != Z_STREAM_END) zlib_error(ret, "bitio:deflate_finish", &z->zs);
 482
 483         if(z->zs.next_out != z->writebuffer) {
 484             z->output->write(z->output, z->writebuffer, z->zs.next_out - (Bytef*)z->writebuffer);
 485             z->zs.next_out = z->writebuffer;
 486             z->zs.avail_out = ZLIB_BUFFER_SIZE;
 487         }
 488
 489         if (ret == Z_STREAM_END) {
 490             break;
 491
 492         }
 493     }
 494     ret = deflateEnd(&z->zs);
 495     if (ret != Z_OK) zlib_error(ret, "bitio:deflate_end", &z->zs);
 496     free(writer->internal);
 497     memset(writer, 0, sizeof(writer_t));
 498     //output->finish(output);
 499 #else
 500     fprintf(stderr, "Error: swftools was compiled without zlib support");
 501     exit(1);
 502 #endif
 503 }
 504 void writer_init_zlibdeflate(writer_t*w, writer_t*output)
 505 {
 506 #ifdef HAVE_ZLIB
 507     struct zlibdeflate_t*z;
 508     int ret;
 509     memset(w, 0, sizeof(writer_t));
 510     z = (struct zlibdeflate_t*)malloc(sizeof(struct zlibdeflate_t));
 511     memset(z, 0, sizeof(struct zlibdeflate_t));
 512     w->internal = z;
 513     w->write = writer_zlibdeflate_write;
 514     w->finish = writer_zlibdeflate_finish;
 515     w->type = WRITER_TYPE_ZLIB;
 516     w->pos = 0;
 517     z->output = output;
 518     memset(&z->zs,0,sizeof(z_stream));
 519     z->zs.zalloc = Z_NULL;
 520     z->zs.zfree  = Z_NULL;
 521     z->zs.opaque = Z_NULL;
 522     ret = deflateInit(&z->zs, 9);
 523     if (ret != Z_OK) zlib_error(ret, "bitio:deflate_init", &z->zs);
 524     w->bitpos = 0;
 525     w->mybyte = 0;
 526     z->zs.next_out = z->writebuffer;
 527     z->zs.avail_out = ZLIB_BUFFER_SIZE;
 528 #else
 529     fprintf(stderr, "Error: swftools was compiled without zlib support");
 530     exit(1);
 531 #endif
 532 }
 533
 534 /* ----------------------- bit handling routines -------------------------- */
 535
 536 void writer_writebit(writer_t*w, int bit)
 537 {
 538     if(w->bitpos==8)
 539     {
 540         w->write(w, &w->mybyte, 1);
 541         w->bitpos = 0;
 542         w->mybyte = 0;
 543     }
 544     if(bit&1)
 545         w->mybyte |= 1 << (7 - w->bitpos);
 546     w->bitpos ++;
 547 }
 548 void writer_writebits(writer_t*w, unsigned int data, int bits)
 549 {
 550     int t;
 551     for(t=0;t<bits;t++)
 552     {
 553         writer_writebit(w, (data >> (bits-t-1))&1);
 554     }
 555 }
 556 void writer_resetbits(writer_t*w)
 557 {
 558     if(w->bitpos)
 559         w->write(w, &w->mybyte, 1);
 560     w->bitpos = 0;
 561     w->mybyte = 0;
 562 }
 563
 564 unsigned int reader_readbit(reader_t*r)
 565 {
 566     if(r->bitpos==8)
 567     {
 568         r->bitpos=0;
 569         r->read(r, &r->mybyte, 1);
 570     }
 571     return (r->mybyte>>(7-r->bitpos++))&1;
 572 }
 573 unsigned int reader_readbits(reader_t*r, int num)
 574 {
 575     int t;
 576     int val = 0;
 577     for(t=0;t<num;t++)
 578     {
 579         val<<=1;
 580         val|=reader_readbit(r);
 581     }
 582     return val;
 583 }
 584 void reader_resetbits(reader_t*r)
 585 {
 586     r->mybyte = 0;
 587     r->bitpos = 8;
 588
 589 }
 590
 591 U8 reader_readU8(reader_t*r)
 592 {
 593     U8 b;
 594     r->read(r, &b, 1);
 595     return b;
 596 }
 597 U16 reader_readU16(reader_t*r)
 598 {
 599     U8 b1,b2;
 600     r->read(r, &b1, 1);
 601     r->read(r, &b2, 1);
 602     return b1|b2<<8;
 603 }
 604 U32 reader_readU32(reader_t*r)
 605 {
 606     U8 b1,b2,b3,b4;
 607     r->read(r, &b1, 1);
 608     r->read(r, &b2, 1);
 609     r->read(r, &b3, 1);
 610     r->read(r, &b4, 1);
 611     return b1|b2<<8|b3<<16|b4<<24;
 612 }
 613 float reader_readFloat(reader_t*r)
 614 {
 615     U8 b1,b2,b3,b4;
 616     r->read(r, &b1, 1);
 617     r->read(r, &b2, 1);
 618     r->read(r, &b3, 1);
 619     r->read(r, &b4, 1);
 620     U32 w = (b1|b2<<8|b3<<16|b4<<24);
 621     return *(float*)&w;
 622 }
 623 double reader_readDouble(reader_t*r)
 624 {
 625     double f;
 626     r->read(r, &f, 8);
 627     return f;
 628
 629     U8 b[8];
 630     r->read(r, b, 8);
 631     U64 w = ((U64)b[0]|(U64)b[1]<<8|(U64)b[2]<<16|(U64)b[3]<<24|(U64)b[4]<<32|(U64)b[5]<<40|(U64)b[6]<<48|(U64)b[7]<<56);
 632     return *(double*)&w;
 633 }
 634 char*reader_readString(reader_t*r)
 635 {
 636     writer_t g;
 637     writer_init_growingmemwriter(&g, 16);
 638     while(1) {
 639         U8 b = reader_readU8(r);
 640         writer_writeU8(&g, b);
 641         if(!b)
 642             break;
 643     }
 644     char*string = (char*)writer_growmemwrite_getmem(&g);
 645     writer_growmemwrite_finish(&g);
 646     return string;
 647 }
 648
 649 void writer_writeString(writer_t*w, const char*s)
 650 {
 651     int l = strlen(s);
 652     char zero = 0;
 653     w->write(w, (void*)s, l);
 654     w->write(w, &zero, 1);
 655 }
 656 void writer_writeU8(writer_t*w, unsigned char b)
 657 {
 658     w->write(w, &b, 1);
 659 }
 660 void writer_writeU16(writer_t*w, unsigned short v)
 661 {
 662     unsigned char b1 = v;
 663     unsigned char b2 = v>>8;
 664     w->write(w, &b1, 1);
 665     w->write(w, &b2, 1);
 666 }
 667 void writer_writeU32(writer_t*w, unsigned long v)
 668 {
 669     unsigned char b1 = v;
 670     unsigned char b2 = v>>8;
 671     unsigned char b3 = v>>16;
 672     unsigned char b4 = v>>24;
 673     w->write(w, &b1, 1);
 674     w->write(w, &b2, 1);
 675     w->write(w, &b3, 1);
 676     w->write(w, &b4, 1);
 677 }
 678 void writer_writeFloat(writer_t*w, float f)
 679 {
 680     unsigned long v = *(unsigned long*)&f;
 681     unsigned char b1 = v;
 682     unsigned char b2 = v>>8;
 683     unsigned char b3 = v>>16;
 684     unsigned char b4 = v>>24;
 685     w->write(w, &b1, 1);
 686     w->write(w, &b2, 1);
 687     w->write(w, &b3, 1);
 688     w->write(w, &b4, 1);
 689 }
 690 void writer_writeDouble(writer_t*w, double f)
 691 {
 692     w->write(w, &f, 8);
 693     return;
 694
 695     unsigned long long v = *(unsigned long long*)&f;
 696     unsigned char b1 = v;
 697     unsigned char b2 = v>>8;
 698     unsigned char b3 = v>>16;
 699     unsigned char b4 = v>>24;
 700     unsigned char b5 = v>>32;
 701     unsigned char b6 = v>>40;
 702     unsigned char b7 = v>>48;
 703     unsigned char b8 = v>>56;
 704     w->write(w, &b1, 1);
 705     w->write(w, &b2, 1);
 706     w->write(w, &b3, 1);
 707     w->write(w, &b4, 1);
 708     w->write(w, &b5, 1);
 709     w->write(w, &b6, 1);
 710     w->write(w, &b7, 1);
 711     w->write(w, &b8, 1);
 712 }