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 typedef struct _memread
  84 {
  85     unsigned char*data;
  86     int length;
  87 } memread_t;
  88
  89 static int reader_memread(reader_t*reader, void* data, int len)
  90 {
  91     memread_t*mr = (memread_t*)reader->internal;
  92
  93     if(mr->length - reader->pos < len) {
  94         len = mr->length - reader->pos;
  95     }
  96     memcpy(data, &mr->data[reader->pos], len);
  97     reader->pos += len;
  98     return len;
  99 }
 100 static void reader_memread_dealloc(reader_t*reader)
 101 {
 102     if(reader->internal)
 103         free(reader->internal);
 104     memset(reader, 0, sizeof(reader_t));
 105 }
 106 void reader_init_memreader(reader_t*r, void*newdata, int newlength)
 107 {
 108     memread_t*mr = (memread_t*)malloc(sizeof(memread_t));
 109     mr->data = (unsigned char*)newdata;
 110     mr->length = newlength;
 111     r->read = reader_memread;
 112     r->dealloc = reader_memread_dealloc;
 113     r->internal = (void*)mr;
 114     r->type = READER_TYPE_MEM;
 115     r->mybyte = 0;
 116     r->bitpos = 8;
 117     r->pos = 0;
 118 }
 119
 120 /* ---------------------------- mem writer ------------------------------- */
 121
 122 typedef struct _memwrite
 123 {
 124     unsigned char*data;
 125     int length;
 126 } memwrite_t;
 127
 128 static int writer_memwrite_write(writer_t*w, void* data, int len)
 129 {
 130     memwrite_t*mw = (memwrite_t*)w->internal;
 131     if(mw->length - w->pos > len) {
 132         memcpy(&mw->data[w->pos], data, len);
 133         w->pos += len;
 134         return len;
 135     } else {
 136         memcpy(&mw->data[w->pos], data, mw->length - w->pos);
 137         w->pos = mw->length;
 138         return mw->length - w->pos;
 139     }
 140 }
 141 static void writer_memwrite_finish(writer_t*w)
 142 {
 143     if(w->internal)
 144         free(w->internal);
 145     w->internal = 0;
 146 }
 147 static void dummy_flush(writer_t*w)
 148 {
 149 }
 150 void writer_init_memwriter(writer_t*w, void*data, int len)
 151 {
 152     memwrite_t *mr;
 153     mr = (memwrite_t*)malloc(sizeof(memwrite_t));
 154     mr->data = (unsigned char *)data;
 155     mr->length = len;
 156     memset(w, 0, sizeof(writer_t));
 157     w->write = writer_memwrite_write;
 158     w->flush = dummy_flush;
 159     w->finish = writer_memwrite_finish;
 160     w->internal = (void*)mr;
 161     w->type = WRITER_TYPE_MEM;
 162     w->bitpos = 0;
 163     w->mybyte = 0;
 164     w->pos = 0;
 165 }
 166
 167 /* ------------------------- growing mem writer ------------------------------- */
 168
 169 typedef struct _growmemwrite
 170 {
 171     unsigned char*data;
 172     int length;
 173     U32 grow;
 174 } growmemwrite_t;
 175 static int writer_growmemwrite_write(writer_t*w, void* data, int len)
 176 {
 177     growmemwrite_t*mw = (growmemwrite_t*)w->internal;
 178     if(!mw->data) {
 179         fprintf(stderr, "Illegal write operation: data already given away");
 180         exit(1);
 181     }
 182     if(mw->length - w->pos < len) {
 183         int newlength = mw->length;
 184         while(newlength - w->pos < len) {
 185             newlength += mw->grow;
 186         }
 187 #ifdef NO_REALLOC
 188         unsigned char*newmem = (unsigned char*)malloc(newlength);
 189         memcpy(newmem, mw->data, mw->length);
 190         free(mw->data);
 191         mw->data = newmem;
 192 #else
 193         mw->data = (unsigned char*)realloc(mw->data, newlength);
 194 #endif
 195         mw->length = newlength;
 196     }
 197     memcpy(&mw->data[w->pos], data, len);
 198     w->pos += len;
 199     return len;
 200 }
 201 static void writer_growmemwrite_finish(writer_t*w)
 202 {
 203     growmemwrite_t*mw = (growmemwrite_t*)w->internal;
 204     if(mw->data) {
 205         free(mw->data);mw->data = 0;
 206     }
 207     mw->length = 0;
 208     free(w->internal);mw=0;
 209     memset(w, 0, sizeof(writer_t));
 210 }
 211 void* writer_growmemwrite_memptr(writer_t*w, int*len)
 212 {
 213     growmemwrite_t*mw = (growmemwrite_t*)w->internal;
 214     if(len) {
 215         *len = w->pos;
 216     }
 217     return mw->data;
 218 }
 219 void* writer_growmemwrite_getmem(writer_t*w)
 220 {
 221     growmemwrite_t*mw = (growmemwrite_t*)w->internal;
 222     void*ret = mw->data;
 223     /* remove own reference so that neither write() nor finish() can free it.
 224        It's property of the caller now.
 225     */
 226     mw->data = 0;
 227     return ret;
 228 }
 229 void writer_growmemwrite_reset(writer_t*w)
 230 {
 231     growmemwrite_t*mw = (growmemwrite_t*)w->internal;
 232     w->pos = 0;
 233     w->bitpos = 0;
 234     w->mybyte = 0;
 235 }
 236 void writer_init_growingmemwriter(writer_t*w, U32 grow)
 237 {
 238     growmemwrite_t *mw = (growmemwrite_t *)malloc(sizeof(growmemwrite_t));
 239     mw->length = 4096;
 240     mw->data = (unsigned char *)malloc(mw->length);
 241     mw->grow = grow;
 242     memset(w, 0, sizeof(writer_t));
 243     w->write = writer_growmemwrite_write;
 244     w->flush = dummy_flush;
 245     w->finish = writer_growmemwrite_finish;
 246     w->internal = (void*)mw;
 247     w->type = WRITER_TYPE_GROWING_MEM;
 248     w->bitpos = 0;
 249     w->mybyte = 0;
 250     w->pos = 0;
 251 }
 252
 253 /* ---------------------------- file writer ------------------------------- */
 254
 255 typedef struct _filewrite
 256 {
 257     int handle;
 258     char free_handle;
 259 } filewrite_t;
 260
 261 static int writer_filewrite_write(writer_t*w, void* data, int len)
 262 {
 263     filewrite_t * fw= (filewrite_t*)w->internal;
 264     w->pos += len;
 265     return write(fw->handle, data, len);
 266 }
 267 static void writer_filewrite_finish(writer_t*w)
 268 {
 269     filewrite_t *mr = (filewrite_t*)w->internal;
 270     if(mr->free_handle)
 271         close(mr->handle);
 272     free(w->internal);
 273     memset(w, 0, sizeof(writer_t));
 274 }
 275 void writer_init_filewriter(writer_t*w, int handle)
 276 {
 277     filewrite_t *mr = (filewrite_t *)malloc(sizeof(filewrite_t));
 278     mr->handle = handle;
 279     mr->free_handle = 0;
 280     memset(w, 0, sizeof(writer_t));
 281     w->write = writer_filewrite_write;
 282     w->finish = writer_filewrite_finish;
 283     w->internal = mr;
 284     w->type = WRITER_TYPE_FILE;
 285     w->bitpos = 0;
 286     w->mybyte = 0;
 287     w->pos = 0;
 288 }
 289 void writer_init_filewriter2(writer_t*w, char*filename)
 290 {
 291     int fi = open("movie.swf",
 292 #ifdef O_BINARY
 293             O_BINARY|
 294 #endif
 295             O_WRONLY|O_CREAT|O_TRUNC, 0644);
 296     writer_init_filewriter(w, fi);
 297     ((filewrite_t*)w->internal)->free_handle = 1;
 298 }
 299
 300 /* ---------------------------- null writer ------------------------------- */
 301
 302 static int writer_nullwrite_write(writer_t*w, void* data, int len)
 303 {
 304     w->pos += len;
 305     return len;
 306 }
 307 static void writer_nullwrite_finish(writer_t*w)
 308 {
 309     memset(w, 0, sizeof(writer_t));
 310 }
 311 void writer_init_nullwriter(writer_t*w)
 312 {
 313     memset(w, 0, sizeof(writer_t));
 314     w->write = writer_nullwrite_write;
 315     w->flush = dummy_flush;
 316     w->finish = writer_nullwrite_finish;
 317     w->internal = 0;
 318     w->type = WRITER_TYPE_NULL;
 319     w->bitpos = 0;
 320     w->mybyte = 0;
 321     w->pos = 0;
 322 }
 323 /* ---------------------------- zlibinflate reader -------------------------- */
 324
 325 typedef struct _zlibinflate
 326 {
 327 #ifdef HAVE_ZLIB
 328     z_stream zs;
 329     reader_t*input;
 330     unsigned char readbuffer[ZLIB_BUFFER_SIZE];
 331 #endif
 332 } zlibinflate_t;
 333
 334 #ifdef HAVE_ZLIB
 335 static void zlib_error(int ret, char* msg, z_stream*zs)
 336 {
 337     fprintf(stderr, "%s: zlib error (%d): last zlib error: %s\n",
 338           msg,
 339           ret,
 340           zs->msg?zs->msg:"unknown");
 341     perror("errno:");
 342     exit(1);
 343 }
 344 #endif
 345
 346 static int reader_zlibinflate(reader_t*reader, void* data, int len)
 347 {
 348 #ifdef HAVE_ZLIB
 349     zlibinflate_t*z = (zlibinflate_t*)reader->internal;
 350     int ret;
 351     if(!z) {
 352         return 0;
 353     }
 354     if(!len)
 355         return 0;
 356
 357     z->zs.next_out = (Bytef *)data;
 358     z->zs.avail_out = len;
 359
 360     while(1) {
 361         if(!z->zs.avail_in) {
 362             z->zs.avail_in = z->input->read(z->input, z->readbuffer, ZLIB_BUFFER_SIZE);
 363             z->zs.next_in = z->readbuffer;
 364         }
 365         if(z->zs.avail_in)
 366             ret = inflate(&z->zs, Z_NO_FLUSH);
 367         else
 368             ret = inflate(&z->zs, Z_FINISH);
 369
 370         if (ret != Z_OK &&
 371             ret != Z_STREAM_END) zlib_error(ret, "bitio:inflate_inflate", &z->zs);
 372
 373         if (ret == Z_STREAM_END) {
 374                 int pos = z->zs.next_out - (Bytef*)data;
 375                 ret = inflateEnd(&z->zs);
 376                 if (ret != Z_OK) zlib_error(ret, "bitio:inflate_end", &z->zs);
 377                 free(reader->internal);
 378                 reader->internal = 0;
 379                 reader->pos += pos;
 380                 return pos;
 381         }
 382         if(!z->zs.avail_out) {
 383             break;
 384         }
 385     }
 386     reader->pos += len;
 387     return len;
 388 #else
 389     fprintf(stderr, "Error: swftools was compiled without zlib support");
 390     exit(1);
 391 #endif
 392 }
 393 static void reader_zlibinflate_dealloc(reader_t*reader)
 394 {
 395 #ifdef HAVE_ZLIB
 396     zlibinflate_t*z = (zlibinflate_t*)reader->internal;
 397     /* test whether read() already did basic deallocation */
 398     if(reader->internal) {
 399         inflateEnd(&z->zs);
 400         free(reader->internal);
 401     }
 402     memset(reader, 0, sizeof(reader_t));
 403 #endif
 404 }
 405 void reader_init_zlibinflate(reader_t*r, reader_t*input)
 406 {
 407 #ifdef HAVE_ZLIB
 408     zlibinflate_t*z = (zlibinflate_t*)malloc(sizeof(zlibinflate_t));
 409     memset(z, 0, sizeof(zlibinflate_t));
 410     int ret;
 411     memset(r, 0, sizeof(reader_t));
 412     r->internal = z;
 413     r->read = reader_zlibinflate;
 414     r->dealloc = reader_zlibinflate_dealloc;
 415     r->type = READER_TYPE_ZLIB;
 416     r->pos = 0;
 417     z->input = input;
 418     memset(&z->zs,0,sizeof(z_stream));
 419     z->zs.zalloc = Z_NULL;
 420     z->zs.zfree  = Z_NULL;
 421     z->zs.opaque = Z_NULL;
 422     ret = inflateInit(&z->zs);
 423     if (ret != Z_OK) zlib_error(ret, "bitio:inflate_init", &z->zs);
 424     reader_resetbits(r);
 425 #else
 426     fprintf(stderr, "Error: swftools was compiled without zlib support");
 427     exit(1);
 428 #endif
 429 }
 430
 431 /* ---------------------------- zlibdeflate writer -------------------------- */
 432
 433 typedef struct _zlibdeflate
 434 {
 435 #ifdef HAVE_ZLIB
 436     z_stream zs;
 437     writer_t*output;
 438     unsigned char writebuffer[ZLIB_BUFFER_SIZE];
 439 #endif
 440 } zlibdeflate_t;
 441
 442 static int writer_zlibdeflate_write(writer_t*writer, void* data, int len)
 443 {
 444 #ifdef HAVE_ZLIB
 445     zlibdeflate_t*z = (zlibdeflate_t*)writer->internal;
 446     int ret;
 447     if(writer->type != WRITER_TYPE_ZLIB) {
 448         fprintf(stderr, "Wrong writer ID (writer not initialized?)\n");
 449         return 0;
 450     }
 451     if(!z) {
 452         fprintf(stderr, "zlib not initialized!\n");
 453         return 0;
 454     }
 455     if(!len)
 456         return 0;
 457
 458     z->zs.next_in = (Bytef *)data;
 459     z->zs.avail_in = len;
 460
 461     while(1) {
 462         ret = deflate(&z->zs, Z_NO_FLUSH);
 463
 464         if (ret != Z_OK) zlib_error(ret, "bitio:deflate_deflate", &z->zs);
 465
 466         if(z->zs.next_out != z->writebuffer) {
 467             writer->pos += z->zs.next_out - (Bytef*)z->writebuffer;
 468             z->output->write(z->output, z->writebuffer, z->zs.next_out - (Bytef*)z->writebuffer);
 469             z->zs.next_out = z->writebuffer;
 470             z->zs.avail_out = ZLIB_BUFFER_SIZE;
 471         }
 472
 473         if(!z->zs.avail_in) {
 474             break;
 475         }
 476     }
 477     return len;
 478 #else
 479     fprintf(stderr, "Error: swftools was compiled without zlib support");
 480     exit(1);
 481 #endif
 482 }
 483
 484 void writer_zlibdeflate_flush(writer_t*writer)
 485 {
 486 #ifdef HAVE_ZLIB
 487     zlibdeflate_t*z = (zlibdeflate_t*)writer->internal;
 488     int ret;
 489     if(writer->type != WRITER_TYPE_ZLIB) {
 490         fprintf(stderr, "Wrong writer ID (writer not initialized?)\n");
 491         return;
 492     }
 493     if(!z) {
 494         fprintf(stderr, "zlib not initialized!\n");
 495         return;
 496     }
 497
 498     z->zs.next_in = 0;
 499     z->zs.avail_in = 0;
 500     while(1) {
 501         ret = deflate(&z->zs, Z_SYNC_FLUSH);
 502         if (ret != Z_OK) zlib_error(ret, "bitio:deflate_flush", &z->zs);
 503         if(z->zs.next_out != z->writebuffer) {
 504             writer->pos += z->zs.next_out - (Bytef*)z->writebuffer;
 505             z->output->write(z->output, z->writebuffer, z->zs.next_out - (Bytef*)z->writebuffer);
 506             z->zs.next_out = z->writebuffer;
 507             z->zs.avail_out = ZLIB_BUFFER_SIZE;
 508         }
 509         /* TODO: how will zlib let us know it needs more buffer space? */
 510         break;
 511     }
 512     return;
 513 #else
 514     fprintf(stderr, "Error: swftools was compiled without zlib support");
 515     exit(1);
 516 #endif
 517 }
 518
 519 static void writer_zlibdeflate_finish(writer_t*writer)
 520 {
 521 #ifdef HAVE_ZLIB
 522     zlibdeflate_t*z = (zlibdeflate_t*)writer->internal;
 523     writer_t*output;
 524     int ret;
 525     if(writer->type != WRITER_TYPE_ZLIB) {
 526         fprintf(stderr, "Wrong writer ID (writer not initialized?)\n");
 527         return;
 528     }
 529     if(!z)
 530         return;
 531     output= z->output;
 532     while(1) {
 533         ret = deflate(&z->zs, Z_FINISH);
 534         if (ret != Z_OK &&
 535             ret != Z_STREAM_END) zlib_error(ret, "bitio:deflate_finish", &z->zs);
 536
 537         if(z->zs.next_out != z->writebuffer) {
 538             writer->pos += z->zs.next_out - (Bytef*)z->writebuffer;
 539             z->output->write(z->output, z->writebuffer, z->zs.next_out - (Bytef*)z->writebuffer);
 540             z->zs.next_out = z->writebuffer;
 541             z->zs.avail_out = ZLIB_BUFFER_SIZE;
 542         }
 543
 544         if (ret == Z_STREAM_END) {
 545             break;
 546
 547         }
 548     }
 549     ret = deflateEnd(&z->zs);
 550     if (ret != Z_OK) zlib_error(ret, "bitio:deflate_end", &z->zs);
 551     free(writer->internal);
 552     memset(writer, 0, sizeof(writer_t));
 553     //output->finish(output);
 554 #else
 555     fprintf(stderr, "Error: swftools was compiled without zlib support");
 556     exit(1);
 557 #endif
 558 }
 559 void writer_init_zlibdeflate(writer_t*w, writer_t*output)
 560 {
 561 #ifdef HAVE_ZLIB
 562     zlibdeflate_t*z;
 563     int ret;
 564     memset(w, 0, sizeof(writer_t));
 565     z = (zlibdeflate_t*)malloc(sizeof(zlibdeflate_t));
 566     memset(z, 0, sizeof(zlibdeflate_t));
 567     w->internal = z;
 568     w->write = writer_zlibdeflate_write;
 569     w->flush = writer_zlibdeflate_flush;
 570     w->finish = writer_zlibdeflate_finish;
 571     w->type = WRITER_TYPE_ZLIB;
 572     w->pos = 0;
 573     z->output = output;
 574     memset(&z->zs,0,sizeof(z_stream));
 575     z->zs.zalloc = Z_NULL;
 576     z->zs.zfree  = Z_NULL;
 577     z->zs.opaque = Z_NULL;
 578     ret = deflateInit(&z->zs, 9);
 579     if (ret != Z_OK) zlib_error(ret, "bitio:deflate_init", &z->zs);
 580     w->bitpos = 0;
 581     w->mybyte = 0;
 582     z->zs.next_out = z->writebuffer;
 583     z->zs.avail_out = ZLIB_BUFFER_SIZE;
 584 #else
 585     fprintf(stderr, "Error: swftools was compiled without zlib support");
 586     exit(1);
 587 #endif
 588 }
 589
 590 /* ----------------------- bit handling routines -------------------------- */
 591
 592 void writer_writebit(writer_t*w, int bit)
 593 {
 594     if(w->bitpos==8)
 595     {
 596         w->write(w, &w->mybyte, 1);
 597         w->bitpos = 0;
 598         w->mybyte = 0;
 599     }
 600     if(bit&1)
 601         w->mybyte |= 1 << (7 - w->bitpos);
 602     w->bitpos ++;
 603 }
 604 void writer_writebits(writer_t*w, unsigned int data, int bits)
 605 {
 606     int t;
 607     for(t=0;t<bits;t++)
 608     {
 609         writer_writebit(w, (data >> (bits-t-1))&1);
 610     }
 611 }
 612 void writer_resetbits(writer_t*w)
 613 {
 614     if(w->bitpos)
 615         w->write(w, &w->mybyte, 1);
 616     w->bitpos = 0;
 617     w->mybyte = 0;
 618 }
 619
 620 unsigned int reader_readbit(reader_t*r)
 621 {
 622     if(r->bitpos==8)
 623     {
 624         r->bitpos=0;
 625         r->read(r, &r->mybyte, 1);
 626     }
 627     return (r->mybyte>>(7-r->bitpos++))&1;
 628 }
 629 unsigned int reader_readbits(reader_t*r, int num)
 630 {
 631     int t;
 632     int val = 0;
 633     for(t=0;t<num;t++)
 634     {
 635         val<<=1;
 636         val|=reader_readbit(r);
 637     }
 638     return val;
 639 }
 640 void reader_resetbits(reader_t*r)
 641 {
 642     r->mybyte = 0;
 643     r->bitpos = 8;
 644
 645 }
 646
 647 U8 reader_readU8(reader_t*r)
 648 {
 649     U8 b = 0;
 650     if(r->read(r, &b, 1)<1) {
 651         fprintf(stderr, "bitio.c:reader_readU8: Read over end of memory region\n");
 652     }
 653     return b;
 654 }
 655 U16 reader_readU16(reader_t*r)
 656 {
 657     U8 b1=0,b2=0;
 658     if(r->read(r, &b1, 1)<1) {
 659         fprintf(stderr, "bitio.c:reader_readU16: Read over end of memory region\n");
 660     }
 661     if(r->read(r, &b2, 1)<1) {
 662         fprintf(stderr, "bitio.c:reader_readU16: Read over end of memory region\n");
 663     }
 664     return b1|b2<<8;
 665 }
 666 U32 reader_readU32(reader_t*r)
 667 {
 668     U8 b1=0,b2=0,b3=0,b4=0;
 669     if(r->read(r, &b1, 1)<1)
 670         fprintf(stderr, "bitio.c:reader_readU32: Read over end of memory region\n");
 671     if(r->read(r, &b2, 1)<1)
 672         fprintf(stderr, "bitio.c:reader_readU32: Read over end of memory region\n");
 673     if(r->read(r, &b3, 1)<1)
 674         fprintf(stderr, "bitio.c:reader_readU32: Read over end of memory region\n");
 675     if(r->read(r, &b4, 1)<1)
 676         fprintf(stderr, "bitio.c:reader_readU32: Read over end of memory region\n");
 677     return b1|b2<<8|b3<<16|b4<<24;
 678 }
 679 float reader_readFloat(reader_t*r)
 680 {
 681     float f;
 682     r->read(r, &f, 4);
 683     return f;
 684
 685     U8 b1=0,b2=0,b3=0,b4=0;
 686     r->read(r, &b1, 1);
 687     r->read(r, &b2, 1);
 688     r->read(r, &b3, 1);
 689     r->read(r, &b4, 1);
 690     U32 w = (b1|b2<<8|b3<<16|b4<<24);
 691     return *(float*)&w;
 692 }
 693 double reader_readDouble(reader_t*r)
 694 {
 695     double f;
 696     r->read(r, &f, 8);
 697     return f;
 698
 699     U8 b[8];
 700     r->read(r, b, 8);
 701     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);
 702     return *(double*)&w;
 703 }
 704 char*reader_readString(reader_t*r)
 705 {
 706     writer_t g;
 707     writer_init_growingmemwriter(&g, 16);
 708     while(1) {
 709         U8 b = reader_readU8(r);
 710         writer_writeU8(&g, b);
 711         if(!b)
 712             break;
 713     }
 714     char*string = (char*)writer_growmemwrite_getmem(&g);
 715     g.finish(&g);
 716     return string;
 717 }
 718
 719 void writer_writeString(writer_t*w, const char*s)
 720 {
 721     int l = strlen(s);
 722     char zero = 0;
 723     w->write(w, (void*)s, l);
 724     w->write(w, &zero, 1);
 725 }
 726 void writer_writeU8(writer_t*w, unsigned char b)
 727 {
 728     w->write(w, &b, 1);
 729 }
 730 void writer_writeU16(writer_t*w, unsigned short v)
 731 {
 732     unsigned char b1 = v;
 733     unsigned char b2 = v>>8;
 734     w->write(w, &b1, 1);
 735     w->write(w, &b2, 1);
 736 }
 737 void writer_writeU32(writer_t*w, unsigned long v)
 738 {
 739     unsigned char b1 = v;
 740     unsigned char b2 = v>>8;
 741     unsigned char b3 = v>>16;
 742     unsigned char b4 = v>>24;
 743     w->write(w, &b1, 1);
 744     w->write(w, &b2, 1);
 745     w->write(w, &b3, 1);
 746     w->write(w, &b4, 1);
 747 }
 748 void writer_writeFloat(writer_t*w, float f)
 749 {
 750     w->write(w, &f, 4);
 751     return;
 752
 753     unsigned v = *(unsigned*)&f;
 754     unsigned char b1 = v;
 755     unsigned char b2 = v>>8;
 756     unsigned char b3 = v>>16;
 757     unsigned char b4 = v>>24;
 758     w->write(w, &b1, 1);
 759     w->write(w, &b2, 1);
 760     w->write(w, &b3, 1);
 761     w->write(w, &b4, 1);
 762 }
 763 void writer_writeDouble(writer_t*w, double f)
 764 {
 765     w->write(w, &f, 8);
 766     return;
 767
 768     unsigned long long v = *(unsigned long long*)&f;
 769     unsigned char b1 = v;
 770     unsigned char b2 = v>>8;
 771     unsigned char b3 = v>>16;
 772     unsigned char b4 = v>>24;
 773     unsigned char b5 = v>>32;
 774     unsigned char b6 = v>>40;
 775     unsigned char b7 = v>>48;
 776     unsigned char b8 = v>>56;
 777     w->write(w, &b1, 1);
 778     w->write(w, &b2, 1);
 779     w->write(w, &b3, 1);
 780     w->write(w, &b4, 1);
 781     w->write(w, &b5, 1);
 782     w->write(w, &b6, 1);
 783     w->write(w, &b7, 1);
 784     w->write(w, &b8, 1);
 785 }