1 /* libFLAC - Free Lossless Audio Codec library 2 * Copyright (C) 2000-2009 Josh Coalson 3 * Copyright (C) 2011-2016 Xiph.Org Foundation 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * - Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * - Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * - Neither the name of the Xiph.org Foundation nor the names of its 17 * contributors may be used to endorse or promote products derived from 18 * this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifdef HAVE_CONFIG_H 34 # include <config.h> 35 #endif 36 37 #include <stdlib.h> 38 #include <string.h> 39 #include "private/bitwriter.h" 40 #include "private/crc.h" 41 #include "private/macros.h" 42 #include "FLAC/assert.h" 43 #include "share/alloc.h" 44 #include "share/compat.h" 45 #include "share/endswap.h" 46 47 /* Things should be fastest when this matches the machine word size */ 48 /* WATCHOUT: if you change this you must also change the following #defines down to SWAP_BE_WORD_TO_HOST below to match */ 49 /* WATCHOUT: there are a few places where the code will not work unless bwword is >= 32 bits wide */ 50 51 #if (ENABLE_64_BIT_WORDS == 0) 52 53 typedef FLAC__uint32 bwword; 54 #define FLAC__BYTES_PER_WORD 4 /* sizeof bwword */ 55 #define FLAC__BITS_PER_WORD 32 56 /* SWAP_BE_WORD_TO_HOST swaps bytes in a bwword (which is always big-endian) if necessary to match host byte order */ 57 #if WORDS_BIGENDIAN 58 #define SWAP_BE_WORD_TO_HOST(x) (x) 59 #else 60 #define SWAP_BE_WORD_TO_HOST(x) ENDSWAP_32(x) 61 #endif 62 63 #else 64 65 typedef FLAC__uint64 bwword; 66 #define FLAC__BYTES_PER_WORD 8 /* sizeof bwword */ 67 #define FLAC__BITS_PER_WORD 64 68 /* SWAP_BE_WORD_TO_HOST swaps bytes in a bwword (which is always big-endian) if necessary to match host byte order */ 69 #if WORDS_BIGENDIAN 70 #define SWAP_BE_WORD_TO_HOST(x) (x) 71 #else 72 #define SWAP_BE_WORD_TO_HOST(x) ENDSWAP_64(x) 73 #endif 74 75 #endif 76 77 /* 78 * The default capacity here doesn't matter too much. The buffer always grows 79 * to hold whatever is written to it. Usually the encoder will stop adding at 80 * a frame or metadata block, then write that out and clear the buffer for the 81 * next one. 82 */ 83 static const unsigned FLAC__BITWRITER_DEFAULT_CAPACITY = 32768u / sizeof(bwword); /* size in words */ 84 /* When growing, increment 4K at a time */ 85 static const unsigned FLAC__BITWRITER_DEFAULT_INCREMENT = 4096u / sizeof(bwword); /* size in words */ 86 87 #define FLAC__WORDS_TO_BITS(words) ((words) * FLAC__BITS_PER_WORD) 88 #define FLAC__TOTAL_BITS(bw) (FLAC__WORDS_TO_BITS((bw)->words) + (bw)->bits) 89 90 struct FLAC__BitWriter { 91 bwword *buffer; 92 bwword accum; /* accumulator; bits are right-justified; when full, accum is appended to buffer */ 93 unsigned capacity; /* capacity of buffer in words */ 94 unsigned words; /* # of complete words in buffer */ 95 unsigned bits; /* # of used bits in accum */ 96 }; 97 98 /* * WATCHOUT: The current implementation only grows the buffer. */ 99 #ifndef __SUNPRO_C 100 static 101 #endif 102 FLAC__bool bitwriter_grow_(FLAC__BitWriter *bw, unsigned bits_to_add) 103 { 104 unsigned new_capacity; 105 bwword *new_buffer; 106 107 FLAC__ASSERT(0 != bw); 108 FLAC__ASSERT(0 != bw->buffer); 109 110 /* calculate total words needed to store 'bits_to_add' additional bits */ 111 new_capacity = bw->words + ((bw->bits + bits_to_add + FLAC__BITS_PER_WORD - 1) / FLAC__BITS_PER_WORD); 112 113 /* it's possible (due to pessimism in the growth estimation that 114 * leads to this call) that we don't actually need to grow 115 */ 116 if(bw->capacity >= new_capacity) 117 return true; 118 119 /* round up capacity increase to the nearest FLAC__BITWRITER_DEFAULT_INCREMENT */ 120 if((new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT) 121 new_capacity += FLAC__BITWRITER_DEFAULT_INCREMENT - ((new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT); 122 /* make sure we got everything right */ 123 FLAC__ASSERT(0 == (new_capacity - bw->capacity) % FLAC__BITWRITER_DEFAULT_INCREMENT); 124 FLAC__ASSERT(new_capacity > bw->capacity); 125 FLAC__ASSERT(new_capacity >= bw->words + ((bw->bits + bits_to_add + FLAC__BITS_PER_WORD - 1) / FLAC__BITS_PER_WORD)); 126 127 new_buffer = safe_realloc_mul_2op_(bw->buffer, sizeof(bwword), /*times*/new_capacity); 128 if(new_buffer == 0) 129 return false; 130 bw->buffer = new_buffer; 131 bw->capacity = new_capacity; 132 return true; 133 } 134 135 136 /*********************************************************************** 137 * 138 * Class constructor/destructor 139 * 140 ***********************************************************************/ 141 142 FLAC__BitWriter *FLAC__bitwriter_new(void) 143 { 144 FLAC__BitWriter *bw = calloc(1, sizeof(FLAC__BitWriter)); 145 /* note that calloc() sets all members to 0 for us */ 146 return bw; 147 } 148 149 void FLAC__bitwriter_delete(FLAC__BitWriter *bw) 150 { 151 FLAC__ASSERT(0 != bw); 152 153 FLAC__bitwriter_free(bw); 154 free(bw); 155 } 156 157 /*********************************************************************** 158 * 159 * Public class methods 160 * 161 ***********************************************************************/ 162 163 FLAC__bool FLAC__bitwriter_init(FLAC__BitWriter *bw) 164 { 165 FLAC__ASSERT(0 != bw); 166 167 bw->words = bw->bits = 0; 168 bw->capacity = FLAC__BITWRITER_DEFAULT_CAPACITY; 169 bw->buffer = malloc(sizeof(bwword) * bw->capacity); 170 if(bw->buffer == 0) 171 return false; 172 173 return true; 174 } 175 176 void FLAC__bitwriter_free(FLAC__BitWriter *bw) 177 { 178 FLAC__ASSERT(0 != bw); 179 180 if(0 != bw->buffer) 181 free(bw->buffer); 182 bw->buffer = 0; 183 bw->capacity = 0; 184 bw->words = bw->bits = 0; 185 } 186 187 void FLAC__bitwriter_clear(FLAC__BitWriter *bw) 188 { 189 bw->words = bw->bits = 0; 190 } 191 192 void FLAC__bitwriter_dump(const FLAC__BitWriter *bw, FILE *out) 193 { 194 unsigned i, j; 195 if(bw == 0) { 196 fprintf(out, "bitwriter is NULL\n"); 197 } 198 else { 199 fprintf(out, "bitwriter: capacity=%u words=%u bits=%u total_bits=%u\n", bw->capacity, bw->words, bw->bits, FLAC__TOTAL_BITS(bw)); 200 201 for(i = 0; i < bw->words; i++) { 202 fprintf(out, "%08X: ", i); 203 for(j = 0; j < FLAC__BITS_PER_WORD; j++) 204 fprintf(out, "%01u", bw->buffer[i] & ((bwword)1 << (FLAC__BITS_PER_WORD-j-1)) ? 1:0); 205 fprintf(out, "\n"); 206 } 207 if(bw->bits > 0) { 208 fprintf(out, "%08X: ", i); 209 for(j = 0; j < bw->bits; j++) 210 fprintf(out, "%01u", bw->accum & ((bwword)1 << (bw->bits-j-1)) ? 1:0); 211 fprintf(out, "\n"); 212 } 213 } 214 } 215 216 FLAC__bool FLAC__bitwriter_get_write_crc16(FLAC__BitWriter *bw, FLAC__uint16 *crc) 217 { 218 const FLAC__byte *buffer; 219 size_t bytes; 220 221 FLAC__ASSERT((bw->bits & 7) == 0); /* assert that we're byte-aligned */ 222 223 if(!FLAC__bitwriter_get_buffer(bw, &buffer, &bytes)) 224 return false; 225 226 *crc = (FLAC__uint16)FLAC__crc16(buffer, bytes); 227 FLAC__bitwriter_release_buffer(bw); 228 return true; 229 } 230 231 FLAC__bool FLAC__bitwriter_get_write_crc8(FLAC__BitWriter *bw, FLAC__byte *crc) 232 { 233 const FLAC__byte *buffer; 234 size_t bytes; 235 236 FLAC__ASSERT((bw->bits & 7) == 0); /* assert that we're byte-aligned */ 237 238 if(!FLAC__bitwriter_get_buffer(bw, &buffer, &bytes)) 239 return false; 240 241 *crc = FLAC__crc8(buffer, bytes); 242 FLAC__bitwriter_release_buffer(bw); 243 return true; 244 } 245 246 FLAC__bool FLAC__bitwriter_is_byte_aligned(const FLAC__BitWriter *bw) 247 { 248 return ((bw->bits & 7) == 0); 249 } 250 251 unsigned FLAC__bitwriter_get_input_bits_unconsumed(const FLAC__BitWriter *bw) 252 { 253 return FLAC__TOTAL_BITS(bw); 254 } 255 256 FLAC__bool FLAC__bitwriter_get_buffer(FLAC__BitWriter *bw, const FLAC__byte **buffer, size_t *bytes) 257 { 258 FLAC__ASSERT((bw->bits & 7) == 0); 259 /* double protection */ 260 if(bw->bits & 7) 261 return false; 262 /* if we have bits in the accumulator we have to flush those to the buffer first */ 263 if(bw->bits) { 264 FLAC__ASSERT(bw->words <= bw->capacity); 265 if(bw->words == bw->capacity && !bitwriter_grow_(bw, FLAC__BITS_PER_WORD)) 266 return false; 267 /* append bits as complete word to buffer, but don't change bw->accum or bw->bits */ 268 bw->buffer[bw->words] = SWAP_BE_WORD_TO_HOST(bw->accum << (FLAC__BITS_PER_WORD-bw->bits)); 269 } 270 /* now we can just return what we have */ 271 *buffer = (FLAC__byte*)bw->buffer; 272 *bytes = (FLAC__BYTES_PER_WORD * bw->words) + (bw->bits >> 3); 273 return true; 274 } 275 276 void FLAC__bitwriter_release_buffer(FLAC__BitWriter *bw) 277 { 278 /* nothing to do. in the future, strict checking of a 'writer-is-in- 279 * get-mode' flag could be added everywhere and then cleared here 280 */ 281 (void)bw; 282 } 283 284 inline FLAC__bool FLAC__bitwriter_write_zeroes(FLAC__BitWriter *bw, unsigned bits) 285 { 286 unsigned n; 287 288 FLAC__ASSERT(0 != bw); 289 FLAC__ASSERT(0 != bw->buffer); 290 291 if(bits == 0) 292 return true; 293 /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+bits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */ 294 if(bw->capacity <= bw->words + bits && !bitwriter_grow_(bw, bits)) 295 return false; 296 /* first part gets to word alignment */ 297 if(bw->bits) { 298 n = flac_min(FLAC__BITS_PER_WORD - bw->bits, bits); 299 bw->accum <<= n; 300 bits -= n; 301 bw->bits += n; 302 if(bw->bits == FLAC__BITS_PER_WORD) { 303 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum); 304 bw->bits = 0; 305 } 306 else 307 return true; 308 } 309 /* do whole words */ 310 while(bits >= FLAC__BITS_PER_WORD) { 311 bw->buffer[bw->words++] = 0; 312 bits -= FLAC__BITS_PER_WORD; 313 } 314 /* do any leftovers */ 315 if(bits > 0) { 316 bw->accum = 0; 317 bw->bits = bits; 318 } 319 return true; 320 } 321 322 static inline FLAC__bool FLAC__bitwriter_write_raw_uint32_nocheck(FLAC__BitWriter *bw, FLAC__uint32 val, unsigned bits) 323 { 324 register unsigned left; 325 326 /* WATCHOUT: code does not work with <32bit words; we can make things much faster with this assertion */ 327 FLAC__ASSERT(FLAC__BITS_PER_WORD >= 32); 328 329 if(bw == 0 || bw->buffer == 0) 330 return false; 331 332 if (bits > 32) 333 return false; 334 335 if(bits == 0) 336 return true; 337 338 FLAC__ASSERT((bits == 32) || (val>>bits == 0)); 339 340 /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+bits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */ 341 if(bw->capacity <= bw->words + bits && !bitwriter_grow_(bw, bits)) 342 return false; 343 344 left = FLAC__BITS_PER_WORD - bw->bits; 345 if(bits < left) { 346 bw->accum <<= bits; 347 bw->accum |= val; 348 bw->bits += bits; 349 } 350 else if(bw->bits) { /* WATCHOUT: if bw->bits == 0, left==FLAC__BITS_PER_WORD and bw->accum<<=left is a NOP instead of setting to 0 */ 351 bw->accum <<= left; 352 bw->accum |= val >> (bw->bits = bits - left); 353 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum); 354 bw->accum = val; /* unused top bits can contain garbage */ 355 } 356 else { /* at this point bits == FLAC__BITS_PER_WORD == 32 and bw->bits == 0 */ 357 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST((bwword)val); 358 } 359 360 return true; 361 } 362 363 inline FLAC__bool FLAC__bitwriter_write_raw_uint32(FLAC__BitWriter *bw, FLAC__uint32 val, unsigned bits) 364 { 365 /* check that unused bits are unset */ 366 if((bits < 32) && (val>>bits != 0)) 367 return false; 368 369 return FLAC__bitwriter_write_raw_uint32_nocheck(bw, val, bits); 370 } 371 372 inline FLAC__bool FLAC__bitwriter_write_raw_int32(FLAC__BitWriter *bw, FLAC__int32 val, unsigned bits) 373 { 374 /* zero-out unused bits */ 375 if(bits < 32) 376 val &= (~(0xffffffff << bits)); 377 378 return FLAC__bitwriter_write_raw_uint32_nocheck(bw, (FLAC__uint32)val, bits); 379 } 380 381 inline FLAC__bool FLAC__bitwriter_write_raw_uint64(FLAC__BitWriter *bw, FLAC__uint64 val, unsigned bits) 382 { 383 /* this could be a little faster but it's not used for much */ 384 if(bits > 32) { 385 return 386 FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)(val>>32), bits-32) && 387 FLAC__bitwriter_write_raw_uint32_nocheck(bw, (FLAC__uint32)val, 32); 388 } 389 else 390 return FLAC__bitwriter_write_raw_uint32(bw, (FLAC__uint32)val, bits); 391 } 392 393 inline FLAC__bool FLAC__bitwriter_write_raw_uint32_little_endian(FLAC__BitWriter *bw, FLAC__uint32 val) 394 { 395 /* this doesn't need to be that fast as currently it is only used for vorbis comments */ 396 397 if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, val & 0xff, 8)) 398 return false; 399 if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, (val>>8) & 0xff, 8)) 400 return false; 401 if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, (val>>16) & 0xff, 8)) 402 return false; 403 if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, val>>24, 8)) 404 return false; 405 406 return true; 407 } 408 409 inline FLAC__bool FLAC__bitwriter_write_byte_block(FLAC__BitWriter *bw, const FLAC__byte vals[], unsigned nvals) 410 { 411 unsigned i; 412 413 /* this could be faster but currently we don't need it to be since it's only used for writing metadata */ 414 for(i = 0; i < nvals; i++) { 415 if(!FLAC__bitwriter_write_raw_uint32_nocheck(bw, (FLAC__uint32)(vals[i]), 8)) 416 return false; 417 } 418 419 return true; 420 } 421 422 FLAC__bool FLAC__bitwriter_write_unary_unsigned(FLAC__BitWriter *bw, unsigned val) 423 { 424 if(val < 32) 425 return FLAC__bitwriter_write_raw_uint32_nocheck(bw, 1, ++val); 426 else 427 return 428 FLAC__bitwriter_write_zeroes(bw, val) && 429 FLAC__bitwriter_write_raw_uint32_nocheck(bw, 1, 1); 430 } 431 432 unsigned FLAC__bitwriter_rice_bits(FLAC__int32 val, unsigned parameter) 433 { 434 FLAC__uint32 uval; 435 436 FLAC__ASSERT(parameter < 32); 437 438 /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */ 439 uval = val; 440 uval <<= 1; 441 uval ^= (val>>31); 442 443 return 1 + parameter + (uval >> parameter); 444 } 445 446 #if 0 /* UNUSED */ 447 unsigned FLAC__bitwriter_golomb_bits_signed(int val, unsigned parameter) 448 { 449 unsigned bits, msbs, uval; 450 unsigned k; 451 452 FLAC__ASSERT(parameter > 0); 453 454 /* fold signed to unsigned */ 455 if(val < 0) 456 uval = (unsigned)(((-(++val)) << 1) + 1); 457 else 458 uval = (unsigned)(val << 1); 459 460 k = FLAC__bitmath_ilog2(parameter); 461 if(parameter == 1u<<k) { 462 FLAC__ASSERT(k <= 30); 463 464 msbs = uval >> k; 465 bits = 1 + k + msbs; 466 } 467 else { 468 unsigned q, r, d; 469 470 d = (1 << (k+1)) - parameter; 471 q = uval / parameter; 472 r = uval - (q * parameter); 473 474 bits = 1 + q + k; 475 if(r >= d) 476 bits++; 477 } 478 return bits; 479 } 480 481 unsigned FLAC__bitwriter_golomb_bits_unsigned(unsigned uval, unsigned parameter) 482 { 483 unsigned bits, msbs; 484 unsigned k; 485 486 FLAC__ASSERT(parameter > 0); 487 488 k = FLAC__bitmath_ilog2(parameter); 489 if(parameter == 1u<<k) { 490 FLAC__ASSERT(k <= 30); 491 492 msbs = uval >> k; 493 bits = 1 + k + msbs; 494 } 495 else { 496 unsigned q, r, d; 497 498 d = (1 << (k+1)) - parameter; 499 q = uval / parameter; 500 r = uval - (q * parameter); 501 502 bits = 1 + q + k; 503 if(r >= d) 504 bits++; 505 } 506 return bits; 507 } 508 #endif /* UNUSED */ 509 510 FLAC__bool FLAC__bitwriter_write_rice_signed(FLAC__BitWriter *bw, FLAC__int32 val, unsigned parameter) 511 { 512 unsigned total_bits, interesting_bits, msbs; 513 FLAC__uint32 uval, pattern; 514 515 FLAC__ASSERT(0 != bw); 516 FLAC__ASSERT(0 != bw->buffer); 517 FLAC__ASSERT(parameter < 32); 518 519 /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */ 520 uval = val; 521 uval <<= 1; 522 uval ^= (val>>31); 523 524 msbs = uval >> parameter; 525 interesting_bits = 1 + parameter; 526 total_bits = interesting_bits + msbs; 527 pattern = 1 << parameter; /* the unary end bit */ 528 pattern |= (uval & ((1<<parameter)-1)); /* the binary LSBs */ 529 530 if(total_bits <= 32) 531 return FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits); 532 else 533 return 534 FLAC__bitwriter_write_zeroes(bw, msbs) && /* write the unary MSBs */ 535 FLAC__bitwriter_write_raw_uint32(bw, pattern, interesting_bits); /* write the unary end bit and binary LSBs */ 536 } 537 538 FLAC__bool FLAC__bitwriter_write_rice_signed_block(FLAC__BitWriter *bw, const FLAC__int32 *vals, unsigned nvals, unsigned parameter) 539 { 540 const FLAC__uint32 mask1 = (FLAC__uint32)0xffffffff << parameter; /* we val|=mask1 to set the stop bit above it... */ 541 const FLAC__uint32 mask2 = (FLAC__uint32)0xffffffff >> (31-parameter); /* ...then mask off the bits above the stop bit with val&=mask2 */ 542 FLAC__uint32 uval; 543 unsigned left; 544 const unsigned lsbits = 1 + parameter; 545 unsigned msbits, total_bits; 546 547 FLAC__ASSERT(0 != bw); 548 FLAC__ASSERT(0 != bw->buffer); 549 FLAC__ASSERT(parameter < 31); 550 /* WATCHOUT: code does not work with <32bit words; we can make things much faster with this assertion */ 551 FLAC__ASSERT(FLAC__BITS_PER_WORD >= 32); 552 553 while(nvals) { 554 /* fold signed to unsigned; actual formula is: negative(v)? -2v-1 : 2v */ 555 uval = *vals; 556 uval <<= 1; 557 uval ^= (*vals>>31); 558 559 msbits = uval >> parameter; 560 total_bits = lsbits + msbits; 561 562 if(bw->bits && bw->bits + total_bits < FLAC__BITS_PER_WORD) { /* i.e. if the whole thing fits in the current bwword */ 563 /* ^^^ if bw->bits is 0 then we may have filled the buffer and have no free bwword to work in */ 564 bw->bits += total_bits; 565 uval |= mask1; /* set stop bit */ 566 uval &= mask2; /* mask off unused top bits */ 567 bw->accum <<= total_bits; 568 bw->accum |= uval; 569 } 570 else { 571 /* slightly pessimistic size check but faster than "<= bw->words + (bw->bits+msbits+lsbits+FLAC__BITS_PER_WORD-1)/FLAC__BITS_PER_WORD" */ 572 /* OPT: pessimism may cause flurry of false calls to grow_ which eat up all savings before it */ 573 if(bw->capacity <= bw->words + bw->bits + msbits + 1 /* lsbits always fit in 1 bwword */ && !bitwriter_grow_(bw, total_bits)) 574 return false; 575 576 if(msbits) { 577 /* first part gets to word alignment */ 578 if(bw->bits) { 579 left = FLAC__BITS_PER_WORD - bw->bits; 580 if(msbits < left) { 581 bw->accum <<= msbits; 582 bw->bits += msbits; 583 goto break1; 584 } 585 else { 586 bw->accum <<= left; 587 msbits -= left; 588 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum); 589 bw->bits = 0; 590 } 591 } 592 /* do whole words */ 593 while(msbits >= FLAC__BITS_PER_WORD) { 594 bw->buffer[bw->words++] = 0; 595 msbits -= FLAC__BITS_PER_WORD; 596 } 597 /* do any leftovers */ 598 if(msbits > 0) { 599 bw->accum = 0; 600 bw->bits = msbits; 601 } 602 } 603 break1: 604 uval |= mask1; /* set stop bit */ 605 uval &= mask2; /* mask off unused top bits */ 606 607 left = FLAC__BITS_PER_WORD - bw->bits; 608 if(lsbits < left) { 609 bw->accum <<= lsbits; 610 bw->accum |= uval; 611 bw->bits += lsbits; 612 } 613 else { 614 /* if bw->bits == 0, left==FLAC__BITS_PER_WORD which will always 615 * be > lsbits (because of previous assertions) so it would have 616 * triggered the (lsbits<left) case above. 617 */ 618 FLAC__ASSERT(bw->bits); 619 FLAC__ASSERT(left < FLAC__BITS_PER_WORD); 620 bw->accum <<= left; 621 bw->accum |= uval >> (bw->bits = lsbits - left); 622 bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum); 623 bw->accum = uval; /* unused top bits can contain garbage */ 624 } 625 } 626 vals++; 627 nvals--; 628 } 629 return true; 630 } 631 632 #if 0 /* UNUSED */ 633 FLAC__bool FLAC__bitwriter_write_golomb_signed(FLAC__BitWriter *bw, int val, unsigned parameter) 634 { 635 unsigned total_bits, msbs, uval; 636 unsigned k; 637 638 FLAC__ASSERT(0 != bw); 639 FLAC__ASSERT(0 != bw->buffer); 640 FLAC__ASSERT(parameter > 0); 641 642 /* fold signed to unsigned */ 643 if(val < 0) 644 uval = (unsigned)(((-(++val)) << 1) + 1); 645 else 646 uval = (unsigned)(val << 1); 647 648 k = FLAC__bitmath_ilog2(parameter); 649 if(parameter == 1u<<k) { 650 unsigned pattern; 651 652 FLAC__ASSERT(k <= 30); 653 654 msbs = uval >> k; 655 total_bits = 1 + k + msbs; 656 pattern = 1 << k; /* the unary end bit */ 657 pattern |= (uval & ((1u<<k)-1)); /* the binary LSBs */ 658 659 if(total_bits <= 32) { 660 if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits)) 661 return false; 662 } 663 else { 664 /* write the unary MSBs */ 665 if(!FLAC__bitwriter_write_zeroes(bw, msbs)) 666 return false; 667 /* write the unary end bit and binary LSBs */ 668 if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, k+1)) 669 return false; 670 } 671 } 672 else { 673 unsigned q, r, d; 674 675 d = (1 << (k+1)) - parameter; 676 q = uval / parameter; 677 r = uval - (q * parameter); 678 /* write the unary MSBs */ 679 if(!FLAC__bitwriter_write_zeroes(bw, q)) 680 return false; 681 /* write the unary end bit */ 682 if(!FLAC__bitwriter_write_raw_uint32(bw, 1, 1)) 683 return false; 684 /* write the binary LSBs */ 685 if(r >= d) { 686 if(!FLAC__bitwriter_write_raw_uint32(bw, r+d, k+1)) 687 return false; 688 } 689 else { 690 if(!FLAC__bitwriter_write_raw_uint32(bw, r, k)) 691 return false; 692 } 693 } 694 return true; 695 } 696 697 FLAC__bool FLAC__bitwriter_write_golomb_unsigned(FLAC__BitWriter *bw, unsigned uval, unsigned parameter) 698 { 699 unsigned total_bits, msbs; 700 unsigned k; 701 702 FLAC__ASSERT(0 != bw); 703 FLAC__ASSERT(0 != bw->buffer); 704 FLAC__ASSERT(parameter > 0); 705 706 k = FLAC__bitmath_ilog2(parameter); 707 if(parameter == 1u<<k) { 708 unsigned pattern; 709 710 FLAC__ASSERT(k <= 30); 711 712 msbs = uval >> k; 713 total_bits = 1 + k + msbs; 714 pattern = 1 << k; /* the unary end bit */ 715 pattern |= (uval & ((1u<<k)-1)); /* the binary LSBs */ 716 717 if(total_bits <= 32) { 718 if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, total_bits)) 719 return false; 720 } 721 else { 722 /* write the unary MSBs */ 723 if(!FLAC__bitwriter_write_zeroes(bw, msbs)) 724 return false; 725 /* write the unary end bit and binary LSBs */ 726 if(!FLAC__bitwriter_write_raw_uint32(bw, pattern, k+1)) 727 return false; 728 } 729 } 730 else { 731 unsigned q, r, d; 732 733 d = (1 << (k+1)) - parameter; 734 q = uval / parameter; 735 r = uval - (q * parameter); 736 /* write the unary MSBs */ 737 if(!FLAC__bitwriter_write_zeroes(bw, q)) 738 return false; 739 /* write the unary end bit */ 740 if(!FLAC__bitwriter_write_raw_uint32(bw, 1, 1)) 741 return false; 742 /* write the binary LSBs */ 743 if(r >= d) { 744 if(!FLAC__bitwriter_write_raw_uint32(bw, r+d, k+1)) 745 return false; 746 } 747 else { 748 if(!FLAC__bitwriter_write_raw_uint32(bw, r, k)) 749 return false; 750 } 751 } 752 return true; 753 } 754 #endif /* UNUSED */ 755 756 FLAC__bool FLAC__bitwriter_write_utf8_uint32(FLAC__BitWriter *bw, FLAC__uint32 val) 757 { 758 FLAC__bool ok = 1; 759 760 FLAC__ASSERT(0 != bw); 761 FLAC__ASSERT(0 != bw->buffer); 762 763 if((val & 0x80000000) != 0) /* this version only handles 31 bits */ 764 return false; 765 766 if(val < 0x80) { 767 return FLAC__bitwriter_write_raw_uint32_nocheck(bw, val, 8); 768 } 769 else if(val < 0x800) { 770 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xC0 | (val>>6), 8); 771 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); 772 } 773 else if(val < 0x10000) { 774 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xE0 | (val>>12), 8); 775 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>6)&0x3F), 8); 776 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); 777 } 778 else if(val < 0x200000) { 779 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xF0 | (val>>18), 8); 780 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>12)&0x3F), 8); 781 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>6)&0x3F), 8); 782 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); 783 } 784 else if(val < 0x4000000) { 785 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xF8 | (val>>24), 8); 786 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>18)&0x3F), 8); 787 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>12)&0x3F), 8); 788 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>6)&0x3F), 8); 789 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); 790 } 791 else { 792 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xFC | (val>>30), 8); 793 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>24)&0x3F), 8); 794 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>18)&0x3F), 8); 795 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>12)&0x3F), 8); 796 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | ((val>>6)&0x3F), 8); 797 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (val&0x3F), 8); 798 } 799 800 return ok; 801 } 802 803 FLAC__bool FLAC__bitwriter_write_utf8_uint64(FLAC__BitWriter *bw, FLAC__uint64 val) 804 { 805 FLAC__bool ok = 1; 806 807 FLAC__ASSERT(0 != bw); 808 FLAC__ASSERT(0 != bw->buffer); 809 810 if((val & FLAC__U64L(0xFFFFFFF000000000)) != 0) /* this version only handles 36 bits */ 811 return false; 812 813 if(val < 0x80) { 814 return FLAC__bitwriter_write_raw_uint32_nocheck(bw, (FLAC__uint32)val, 8); 815 } 816 else if(val < 0x800) { 817 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xC0 | (FLAC__uint32)(val>>6), 8); 818 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); 819 } 820 else if(val < 0x10000) { 821 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xE0 | (FLAC__uint32)(val>>12), 8); 822 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); 823 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); 824 } 825 else if(val < 0x200000) { 826 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xF0 | (FLAC__uint32)(val>>18), 8); 827 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8); 828 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); 829 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); 830 } 831 else if(val < 0x4000000) { 832 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xF8 | (FLAC__uint32)(val>>24), 8); 833 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8); 834 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8); 835 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); 836 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); 837 } 838 else if(val < 0x80000000) { 839 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xFC | (FLAC__uint32)(val>>30), 8); 840 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>24)&0x3F), 8); 841 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8); 842 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8); 843 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); 844 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); 845 } 846 else { 847 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0xFE, 8); 848 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>30)&0x3F), 8); 849 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>24)&0x3F), 8); 850 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8); 851 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8); 852 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8); 853 ok &= FLAC__bitwriter_write_raw_uint32_nocheck(bw, 0x80 | (FLAC__uint32)(val&0x3F), 8); 854 } 855 856 return ok; 857 } 858 859 FLAC__bool FLAC__bitwriter_zero_pad_to_byte_boundary(FLAC__BitWriter *bw) 860 { 861 /* 0-pad to byte boundary */ 862 if(bw->bits & 7u) 863 return FLAC__bitwriter_write_zeroes(bw, 8 - (bw->bits & 7u)); 864 else 865 return true; 866 } 867 868 /* These functions are declared inline in this file but are also callable as 869 * externs from elsewhere. 870 * According to the C99 spec, section 6.7.4, simply providing a function 871 * prototype in a header file without 'inline' and making the function inline 872 * in this file should be sufficient. 873 * Unfortunately, the Microsoft VS compiler doesn't pick them up externally. To 874 * fix that we add extern declarations here. 875 */ 876 extern FLAC__bool FLAC__bitwriter_write_zeroes(FLAC__BitWriter *bw, unsigned bits); 877 extern FLAC__bool FLAC__bitwriter_write_raw_uint32(FLAC__BitWriter *bw, FLAC__uint32 val, unsigned bits); 878 extern FLAC__bool FLAC__bitwriter_write_raw_int32(FLAC__BitWriter *bw, FLAC__int32 val, unsigned bits); 879 extern FLAC__bool FLAC__bitwriter_write_raw_uint64(FLAC__BitWriter *bw, FLAC__uint64 val, unsigned bits); 880 extern FLAC__bool FLAC__bitwriter_write_raw_uint32_little_endian(FLAC__BitWriter *bw, FLAC__uint32 val); 881 extern FLAC__bool FLAC__bitwriter_write_byte_block(FLAC__BitWriter *bw, const FLAC__byte vals[], unsigned nvals); 882
