bitbuffer.c
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上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:77k
源码类别:
Windows CE
开发平台:
C/C++
- /* libFLAC - Free Lossless Audio Codec library
- * Copyright (C) 2000,2001,2002,2003,2004,2005 Josh Coalson
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * - Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * - Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * - Neither the name of the Xiph.org Foundation nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
- * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
- * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
- * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- #include <stdlib.h> /* for malloc() */
- #include <string.h> /* for memcpy(), memset() */
- #include "private/bitbuffer.h"
- #include "private/bitmath.h"
- #include "private/crc.h"
- #include "FLAC/assert.h"
- /*
- * Along the way you will see two versions of some functions, selected
- * by a FLAC__NO_MANUAL_INLINING macro. One is the simplified, more
- * readable, and slow version, and the other is the same function
- * where crucial parts have been manually inlined and are much faster.
- *
- */
- /*
- * Some optimization strategies are slower with older versions of MSVC
- */
- #if defined _MSC_VER && _MSC_VER <= 1200
- #define FLAC__OLD_MSVC_FLAVOR
- #endif
- /*
- * This should be at least twice as large as the largest number of blurbs
- * required to represent any 'number' (in any encoding) you are going to
- * read. With FLAC this is on the order of maybe a few hundred bits.
- * If the buffer is smaller than that, the decoder won't be able to read
- * in a whole number that is in a variable length encoding (e.g. Rice).
- *
- * The number we are actually using here is based on what would be the
- * approximate maximum size of a verbatim frame at the default block size,
- * for CD audio (4096 sample * 4 bytes per sample), plus some wiggle room.
- * 32kbytes sounds reasonable. For kicks we subtract out 64 bytes for any
- * alignment or malloc overhead.
- *
- * Increase this number to decrease the number of read callbacks, at the
- * expense of using more memory. Or decrease for the reverse effect,
- * keeping in mind the limit from the first paragraph.
- */
- static const unsigned FLAC__BITBUFFER_DEFAULT_CAPACITY = ((65536 - 64) * 8) / FLAC__BITS_PER_BLURB; /* blurbs */
- #ifndef FLAC__OLD_MSVC_FLAVOR
- static const unsigned char byte_to_unary_table[] = {
- 8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
- 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
- 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
- 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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,
- 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,
- 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,
- 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
- };
- #endif
- #if FLAC__BITS_PER_BLURB == 8
- #define FLAC__BITS_PER_BLURB_LOG2 3
- #define FLAC__BYTES_PER_BLURB 1
- #define FLAC__BLURB_ALL_ONES ((FLAC__byte)0xff)
- #define FLAC__BLURB_TOP_BIT_ONE ((FLAC__byte)0x80)
- #define BLURB_BIT_TO_MASK(b) (((FLAC__blurb)'x80') >> (b))
- #define CRC16_UPDATE_BLURB(bb, blurb, crc) FLAC__CRC16_UPDATE((blurb), (crc));
- #ifndef FLAC__OLD_MSVC_FLAVOR
- #define FLAC__ALIGNED_BLURB_UNARY(blurb) (byte_to_unary_table[blurb])
- #endif
- #elif FLAC__BITS_PER_BLURB == 32
- #define FLAC__BITS_PER_BLURB_LOG2 5
- #define FLAC__BYTES_PER_BLURB 4
- #define FLAC__BLURB_ALL_ONES ((FLAC__uint32)0xffffffff)
- #define FLAC__BLURB_TOP_BIT_ONE ((FLAC__uint32)0x80000000)
- #define BLURB_BIT_TO_MASK(b) (((FLAC__blurb)0x80000000) >> (b))
- #define CRC16_UPDATE_BLURB(bb, blurb, crc) crc16_update_blurb((bb), (blurb));
- #ifndef FLAC__OLD_MSVC_FLAVOR
- #define FLAC__ALIGNED_BLURB_UNARY(blurb) ((blurb) <= 0xff ? byte_to_unary_table[blurb] + 24 : ((blurb) <= 0xffff ? byte_to_unary_table[(blurb) >> 8] + 16 : ((blurb) <= 0xffffff ? byte_to_unary_table[(blurb) >> 16] + 8 : byte_to_unary_table[(blurb) >> 24])))
- #endif
- #else
- /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- #define FLAC__BLURBS_TO_BITS(blurbs) ((blurbs) << FLAC__BITS_PER_BLURB_LOG2)
- #ifdef min
- #undef min
- #endif
- #define min(x,y) ((x)<(y)?(x):(y))
- #ifdef max
- #undef max
- #endif
- #define max(x,y) ((x)>(y)?(x):(y))
- /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
- #ifdef _MSC_VER
- #define FLAC__U64L(x) x
- #else
- #define FLAC__U64L(x) x##LLU
- #endif
- #ifndef FLaC__INLINE
- #define FLaC__INLINE
- #endif
- struct FLAC__BitBuffer {
- FLAC__blurb *buffer;
- unsigned capacity; /* in blurbs */
- unsigned blurbs, bits;
- unsigned total_bits; /* must always == FLAC__BITS_PER_BLURB*blurbs+bits */
- unsigned consumed_blurbs, consumed_bits;
- unsigned total_consumed_bits; /* must always == FLAC__BITS_PER_BLURB*consumed_blurbs+consumed_bits */
- FLAC__uint16 read_crc16;
- #if FLAC__BITS_PER_BLURB == 32
- unsigned crc16_align;
- #endif
- FLAC__blurb save_head, save_tail;
- };
- #if FLAC__BITS_PER_BLURB == 32
- static void crc16_update_blurb(FLAC__BitBuffer *bb, FLAC__blurb blurb)
- {
- if(bb->crc16_align == 0) {
- FLAC__CRC16_UPDATE(blurb >> 24, bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> 16) & 0xff, bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> 8) & 0xff, bb->read_crc16);
- FLAC__CRC16_UPDATE(blurb & 0xff, bb->read_crc16);
- }
- else if(bb->crc16_align == 8) {
- FLAC__CRC16_UPDATE((blurb >> 16) & 0xff, bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> 8) & 0xff, bb->read_crc16);
- FLAC__CRC16_UPDATE(blurb & 0xff, bb->read_crc16);
- }
- else if(bb->crc16_align == 16) {
- FLAC__CRC16_UPDATE((blurb >> 8) & 0xff, bb->read_crc16);
- FLAC__CRC16_UPDATE(blurb & 0xff, bb->read_crc16);
- }
- else if(bb->crc16_align == 24) {
- FLAC__CRC16_UPDATE(blurb & 0xff, bb->read_crc16);
- }
- bb->crc16_align = 0;
- }
- #endif
- /*
- * WATCHOUT: The current implentation is not friendly to shrinking, i.e. it
- * does not shift left what is consumed, it just chops off the end, whether
- * there is unconsumed data there or not. This is OK because currently we
- * never shrink the buffer, but if this ever changes, we'll have to do some
- * fixups here.
- */
- static FLAC__bool bitbuffer_resize_(FLAC__BitBuffer *bb, unsigned new_capacity)
- {
- FLAC__blurb *new_buffer;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- if(bb->capacity == new_capacity)
- return true;
- new_buffer = (FLAC__blurb*)calloc(new_capacity, sizeof(FLAC__blurb));
- if(new_buffer == 0)
- return false;
- memcpy(new_buffer, bb->buffer, sizeof(FLAC__blurb)*min(bb->blurbs+(bb->bits?1:0), new_capacity));
- if(new_capacity < bb->blurbs+(bb->bits?1:0)) {
- bb->blurbs = new_capacity;
- bb->bits = 0;
- bb->total_bits = FLAC__BLURBS_TO_BITS(new_capacity);
- }
- if(new_capacity < bb->consumed_blurbs+(bb->consumed_bits?1:0)) {
- bb->consumed_blurbs = new_capacity;
- bb->consumed_bits = 0;
- bb->total_consumed_bits = FLAC__BLURBS_TO_BITS(new_capacity);
- }
- free(bb->buffer); /* we've already asserted above that (0 != bb->buffer) */
- bb->buffer = new_buffer;
- bb->capacity = new_capacity;
- return true;
- }
- static FLAC__bool bitbuffer_grow_(FLAC__BitBuffer *bb, unsigned min_blurbs_to_add)
- {
- unsigned new_capacity;
- FLAC__ASSERT(min_blurbs_to_add > 0);
- new_capacity = max(bb->capacity * 2, bb->capacity + min_blurbs_to_add);
- return bitbuffer_resize_(bb, new_capacity);
- }
- static FLAC__bool bitbuffer_ensure_size_(FLAC__BitBuffer *bb, unsigned bits_to_add)
- {
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- if(FLAC__BLURBS_TO_BITS(bb->capacity) < bb->total_bits + bits_to_add)
- return bitbuffer_grow_(bb, (bits_to_add >> FLAC__BITS_PER_BLURB_LOG2) + 2);
- else
- return true;
- }
- static FLAC__bool bitbuffer_read_from_client_(FLAC__BitBuffer *bb, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- unsigned bytes;
- FLAC__byte *target;
- /* first shift the unconsumed buffer data toward the front as much as possible */
- if(bb->total_consumed_bits >= FLAC__BITS_PER_BLURB) {
- #if FLAC__BITS_PER_BLURB == 8
- /*
- * memset and memcpy are usually implemented in assembly language
- * by the system libc, and they can be much faster
- */
- const unsigned r_end = bb->blurbs + (bb->bits? 1:0);
- const unsigned r = bb->consumed_blurbs, l = r_end - r;
- memmove(&bb->buffer[0], &bb->buffer[r], l);
- memset(&bb->buffer[l], 0, r);
- #elif FLAC__BITS_PER_BLURB == 32
- /* still needs optimization */
- const unsigned r_end = bb->blurbs + (bb->bits? 1:0);
- unsigned l = 0, r = bb->consumed_blurbs;
- for( ; r < r_end; l++, r++)
- bb->buffer[l] = bb->buffer[r];
- for( ; l < r_end; l++)
- bb->buffer[l] = 0;
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif /* FLAC__BITS_PER_BLURB == 32 or 8 */
- bb->blurbs -= bb->consumed_blurbs;
- bb->total_bits -= FLAC__BLURBS_TO_BITS(bb->consumed_blurbs);
- bb->consumed_blurbs = 0;
- bb->total_consumed_bits = bb->consumed_bits;
- }
- /* grow if we need to */
- if(bb->capacity <= 1) {
- if(!bitbuffer_resize_(bb, 16))
- return false;
- }
- /* set the target for reading, taking into account blurb alignment */
- #if FLAC__BITS_PER_BLURB == 8
- /* blurb == byte, so no gyrations necessary: */
- target = bb->buffer + bb->blurbs;
- bytes = bb->capacity - bb->blurbs;
- #elif FLAC__BITS_PER_BLURB == 32
- /* @@@ WATCHOUT: code currently only works for big-endian: */
- FLAC__ASSERT((bb->bits & 7) == 0);
- target = (FLAC__byte*)(bb->buffer + bb->blurbs) + (bb->bits >> 3);
- bytes = ((bb->capacity - bb->blurbs) << 2) - (bb->bits >> 3); /* i.e. (bb->capacity - bb->blurbs) * FLAC__BYTES_PER_BLURB - (bb->bits / 8) */
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- /* finally, read in some data */
- if(!read_callback(target, &bytes, client_data))
- return false;
- /* now we have to handle partial blurb cases: */
- #if FLAC__BITS_PER_BLURB == 8
- /* blurb == byte, so no gyrations necessary: */
- bb->blurbs += bytes;
- bb->total_bits += FLAC__BLURBS_TO_BITS(bytes);
- #elif FLAC__BITS_PER_BLURB == 32
- /* @@@ WATCHOUT: code currently only works for big-endian: */
- {
- const unsigned aligned_bytes = (bb->bits >> 3) + bytes;
- bb->blurbs += (aligned_bytes >> 2); /* i.e. aligned_bytes / FLAC__BYTES_PER_BLURB */
- bb->bits = (aligned_bytes & 3u) << 3; /* i.e. (aligned_bytes % FLAC__BYTES_PER_BLURB) * 8 */
- bb->total_bits += (bytes << 3);
- }
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- return true;
- }
- /***********************************************************************
- *
- * Class constructor/destructor
- *
- ***********************************************************************/
- FLAC__BitBuffer *FLAC__bitbuffer_new()
- {
- FLAC__BitBuffer *bb = (FLAC__BitBuffer*)calloc(1, sizeof(FLAC__BitBuffer));
- /* calloc() implies:
- memset(bb, 0, sizeof(FLAC__BitBuffer));
- bb->buffer = 0;
- bb->capacity = 0;
- bb->blurbs = bb->bits = bb->total_bits = 0;
- bb->consumed_blurbs = bb->consumed_bits = bb->total_consumed_bits = 0;
- */
- return bb;
- }
- void FLAC__bitbuffer_delete(FLAC__BitBuffer *bb)
- {
- FLAC__ASSERT(0 != bb);
- FLAC__bitbuffer_free(bb);
- free(bb);
- }
- /***********************************************************************
- *
- * Public class methods
- *
- ***********************************************************************/
- FLAC__bool FLAC__bitbuffer_init(FLAC__BitBuffer *bb)
- {
- FLAC__ASSERT(0 != bb);
- bb->buffer = 0;
- bb->capacity = 0;
- bb->blurbs = bb->bits = bb->total_bits = 0;
- bb->consumed_blurbs = bb->consumed_bits = bb->total_consumed_bits = 0;
- return FLAC__bitbuffer_clear(bb);
- }
- FLAC__bool FLAC__bitbuffer_init_from(FLAC__BitBuffer *bb, const FLAC__byte buffer[], unsigned bytes)
- {
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(bytes > 0);
- if(!FLAC__bitbuffer_init(bb))
- return false;
- if(!bitbuffer_ensure_size_(bb, bytes << 3))
- return false;
- FLAC__ASSERT(0 != buffer);
- /* @@@ WATCHOUT: code currently only works for 8-bits-per-blurb inclusive-or big-endian: */
- memcpy((FLAC__byte*)bb->buffer, buffer, sizeof(FLAC__byte)*bytes);
- bb->blurbs = bytes / FLAC__BYTES_PER_BLURB;
- bb->bits = (bytes % FLAC__BYTES_PER_BLURB) << 3;
- bb->total_bits = bytes << 3;
- return true;
- }
- FLAC__bool FLAC__bitbuffer_concatenate_aligned(FLAC__BitBuffer *dest, const FLAC__BitBuffer *src)
- {
- unsigned bits_to_add = src->total_bits - src->total_consumed_bits;
- FLAC__ASSERT(0 != dest);
- FLAC__ASSERT(0 != src);
- if(bits_to_add == 0)
- return true;
- if(dest->bits != src->consumed_bits)
- return false;
- if(!bitbuffer_ensure_size_(dest, bits_to_add))
- return false;
- if(dest->bits == 0) {
- memcpy(dest->buffer+dest->blurbs, src->buffer+src->consumed_blurbs, sizeof(FLAC__blurb)*(src->blurbs-src->consumed_blurbs + ((src->bits)? 1:0)));
- }
- else if(dest->bits + bits_to_add > FLAC__BITS_PER_BLURB) {
- dest->buffer[dest->blurbs] <<= (FLAC__BITS_PER_BLURB - dest->bits);
- dest->buffer[dest->blurbs] |= (src->buffer[src->consumed_blurbs] & ((1u << (FLAC__BITS_PER_BLURB-dest->bits)) - 1));
- memcpy(dest->buffer+dest->blurbs+1, src->buffer+src->consumed_blurbs+1, sizeof(FLAC__blurb)*(src->blurbs-src->consumed_blurbs-1 + ((src->bits)? 1:0)));
- }
- else {
- dest->buffer[dest->blurbs] <<= bits_to_add;
- dest->buffer[dest->blurbs] |= (src->buffer[src->consumed_blurbs] & ((1u << bits_to_add) - 1));
- }
- dest->bits = src->bits;
- dest->total_bits += bits_to_add;
- dest->blurbs = dest->total_bits / FLAC__BITS_PER_BLURB;
- return true;
- }
- void FLAC__bitbuffer_free(FLAC__BitBuffer *bb)
- {
- FLAC__ASSERT(0 != bb);
- if(0 != bb->buffer)
- free(bb->buffer);
- bb->buffer = 0;
- bb->capacity = 0;
- bb->blurbs = bb->bits = bb->total_bits = 0;
- bb->consumed_blurbs = bb->consumed_bits = bb->total_consumed_bits = 0;
- }
- FLAC__bool FLAC__bitbuffer_clear(FLAC__BitBuffer *bb)
- {
- if(bb->buffer == 0) {
- bb->capacity = FLAC__BITBUFFER_DEFAULT_CAPACITY;
- bb->buffer = (FLAC__blurb*)calloc(bb->capacity, sizeof(FLAC__blurb));
- if(bb->buffer == 0)
- return false;
- }
- else {
- memset(bb->buffer, 0, bb->blurbs + (bb->bits?1:0));
- }
- bb->blurbs = bb->bits = bb->total_bits = 0;
- bb->consumed_blurbs = bb->consumed_bits = bb->total_consumed_bits = 0;
- return true;
- }
- FLAC__bool FLAC__bitbuffer_clone(FLAC__BitBuffer *dest, const FLAC__BitBuffer *src)
- {
- FLAC__ASSERT(0 != dest);
- FLAC__ASSERT(0 != dest->buffer);
- FLAC__ASSERT(0 != src);
- FLAC__ASSERT(0 != src->buffer);
- if(dest->capacity < src->capacity)
- if(!bitbuffer_resize_(dest, src->capacity))
- return false;
- memcpy(dest->buffer, src->buffer, sizeof(FLAC__blurb)*min(src->capacity, src->blurbs+1));
- dest->blurbs = src->blurbs;
- dest->bits = src->bits;
- dest->total_bits = src->total_bits;
- dest->consumed_blurbs = src->consumed_blurbs;
- dest->consumed_bits = src->consumed_bits;
- dest->total_consumed_bits = src->total_consumed_bits;
- dest->read_crc16 = src->read_crc16;
- return true;
- }
- void FLAC__bitbuffer_reset_read_crc16(FLAC__BitBuffer *bb, FLAC__uint16 seed)
- {
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT((bb->consumed_bits & 7) == 0);
- bb->read_crc16 = seed;
- #if FLAC__BITS_PER_BLURB == 8
- /* no need to do anything */
- #elif FLAC__BITS_PER_BLURB == 32
- bb->crc16_align = bb->consumed_bits;
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- }
- FLAC__uint16 FLAC__bitbuffer_get_read_crc16(FLAC__BitBuffer *bb)
- {
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT((bb->bits & 7) == 0);
- FLAC__ASSERT((bb->consumed_bits & 7) == 0);
- #if FLAC__BITS_PER_BLURB == 8
- /* no need to do anything */
- #elif FLAC__BITS_PER_BLURB == 32
- /*@@@ BUG: even though this probably can't happen with FLAC, need to fix the case where we are called here for the very first blurb and crc16_align is > 0 */
- if(bb->bits == 0 || bb->consumed_blurbs < bb->blurbs) {
- if(bb->consumed_bits == 8) {
- const FLAC__blurb blurb = bb->buffer[bb->consumed_blurbs];
- FLAC__CRC16_UPDATE(blurb >> 24, bb->read_crc16);
- }
- else if(bb->consumed_bits == 16) {
- const FLAC__blurb blurb = bb->buffer[bb->consumed_blurbs];
- FLAC__CRC16_UPDATE(blurb >> 24, bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> 16) & 0xff, bb->read_crc16);
- }
- else if(bb->consumed_bits == 24) {
- const FLAC__blurb blurb = bb->buffer[bb->consumed_blurbs];
- FLAC__CRC16_UPDATE(blurb >> 24, bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> 16) & 0xff, bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> 8) & 0xff, bb->read_crc16);
- }
- }
- else {
- if(bb->consumed_bits == 8) {
- const FLAC__blurb blurb = bb->buffer[bb->consumed_blurbs];
- FLAC__CRC16_UPDATE(blurb >> (bb->bits-8), bb->read_crc16);
- }
- else if(bb->consumed_bits == 16) {
- const FLAC__blurb blurb = bb->buffer[bb->consumed_blurbs];
- FLAC__CRC16_UPDATE(blurb >> (bb->bits-8), bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> (bb->bits-16)) & 0xff, bb->read_crc16);
- }
- else if(bb->consumed_bits == 24) {
- const FLAC__blurb blurb = bb->buffer[bb->consumed_blurbs];
- FLAC__CRC16_UPDATE(blurb >> (bb->bits-8), bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> (bb->bits-16)) & 0xff, bb->read_crc16);
- FLAC__CRC16_UPDATE((blurb >> (bb->bits-24)) & 0xff, bb->read_crc16);
- }
- }
- bb->crc16_align = bb->consumed_bits;
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- return bb->read_crc16;
- }
- FLAC__uint16 FLAC__bitbuffer_get_write_crc16(const FLAC__BitBuffer *bb)
- {
- FLAC__ASSERT((bb->bits & 7) == 0); /* assert that we're byte-aligned */
- #if FLAC__BITS_PER_BLURB == 8
- return FLAC__crc16(bb->buffer, bb->blurbs);
- #elif FLAC__BITS_PER_BLURB == 32
- /* @@@ WATCHOUT: code currently only works for big-endian: */
- return FLAC__crc16((FLAC__byte*)(bb->buffer), (bb->blurbs * FLAC__BYTES_PER_BLURB) + (bb->bits >> 3));
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- }
- FLAC__byte FLAC__bitbuffer_get_write_crc8(const FLAC__BitBuffer *bb)
- {
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT((bb->bits & 7) == 0); /* assert that we're byte-aligned */
- FLAC__ASSERT(bb->buffer[0] == 0xff); /* MAGIC NUMBER for the first byte of the sync code */
- #if FLAC__BITS_PER_BLURB == 8
- return FLAC__crc8(bb->buffer, bb->blurbs);
- #elif FLAC__BITS_PER_BLURB == 32
- /* @@@ WATCHOUT: code currently only works for big-endian: */
- return FLAC__crc8((FLAC__byte*)(bb->buffer), (bb->blurbs * FLAC__BYTES_PER_BLURB) + (bb->bits >> 3));
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- }
- FLAC__bool FLAC__bitbuffer_is_byte_aligned(const FLAC__BitBuffer *bb)
- {
- return ((bb->bits & 7) == 0);
- }
- FLAC__bool FLAC__bitbuffer_is_consumed_byte_aligned(const FLAC__BitBuffer *bb)
- {
- return ((bb->consumed_bits & 7) == 0);
- }
- unsigned FLAC__bitbuffer_bits_left_for_byte_alignment(const FLAC__BitBuffer *bb)
- {
- return 8 - (bb->consumed_bits & 7);
- }
- unsigned FLAC__bitbuffer_get_input_bytes_unconsumed(const FLAC__BitBuffer *bb)
- {
- FLAC__ASSERT((bb->consumed_bits & 7) == 0 && (bb->bits & 7) == 0);
- return (bb->total_bits - bb->total_consumed_bits) >> 3;
- }
- void FLAC__bitbuffer_get_buffer(FLAC__BitBuffer *bb, const FLAC__byte **buffer, unsigned *bytes)
- {
- FLAC__ASSERT((bb->consumed_bits & 7) == 0 && (bb->bits & 7) == 0);
- #if FLAC__BITS_PER_BLURB == 8
- *buffer = bb->buffer + bb->consumed_blurbs;
- *bytes = bb->blurbs - bb->consumed_blurbs;
- #elif FLAC__BITS_PER_BLURB == 32
- /* @@@ WATCHOUT: code currently only works for big-endian: */
- *buffer = (FLAC__byte*)(bb->buffer + bb->consumed_blurbs) + (bb->consumed_bits >> 3);
- *bytes = (bb->total_bits - bb->total_consumed_bits) >> 3;
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- }
- void FLAC__bitbuffer_release_buffer(FLAC__BitBuffer *bb)
- {
- #if FLAC__BITS_PER_BLURB == 8
- (void)bb;
- #elif FLAC__BITS_PER_BLURB == 32
- /* @@@ WATCHOUT: code currently only works for big-endian: */
- (void)bb;
- #else
- FLAC__ASSERT(false); /* ERROR, only sizes of 8 and 32 are supported */
- #endif
- }
- FLAC__bool FLAC__bitbuffer_write_zeroes(FLAC__BitBuffer *bb, unsigned bits)
- {
- unsigned n;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- if(bits == 0)
- return true;
- if(!bitbuffer_ensure_size_(bb, bits))
- return false;
- bb->total_bits += bits;
- while(bits > 0) {
- n = min(FLAC__BITS_PER_BLURB - bb->bits, bits);
- bb->buffer[bb->blurbs] <<= n;
- bits -= n;
- bb->bits += n;
- if(bb->bits == FLAC__BITS_PER_BLURB) {
- bb->blurbs++;
- bb->bits = 0;
- }
- }
- return true;
- }
- FLaC__INLINE FLAC__bool FLAC__bitbuffer_write_raw_uint32(FLAC__BitBuffer *bb, FLAC__uint32 val, unsigned bits)
- {
- unsigned n, k;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 32);
- if(bits == 0)
- return true;
- /* inline the size check so we don't incure a function call unnecessarily */
- if(FLAC__BLURBS_TO_BITS(bb->capacity) < bb->total_bits + bits) {
- if(!bitbuffer_ensure_size_(bb, bits))
- return false;
- }
- /* zero-out unused bits; WATCHOUT: other code relies on this, so this needs to stay */
- if(bits < 32) /* @@@ gcc seems to require this because the following line causes incorrect results when bits==32; investigate */
- val &= (~(0xffffffff << bits)); /* zero-out unused bits */
- bb->total_bits += bits;
- while(bits > 0) {
- n = FLAC__BITS_PER_BLURB - bb->bits;
- if(n == FLAC__BITS_PER_BLURB) { /* i.e. bb->bits == 0 */
- if(bits < FLAC__BITS_PER_BLURB) {
- bb->buffer[bb->blurbs] = (FLAC__blurb)val;
- bb->bits = bits;
- break;
- }
- else if(bits == FLAC__BITS_PER_BLURB) {
- bb->buffer[bb->blurbs++] = (FLAC__blurb)val;
- break;
- }
- else {
- k = bits - FLAC__BITS_PER_BLURB;
- bb->buffer[bb->blurbs++] = (FLAC__blurb)(val >> k);
- /* we know k < 32 so no need to protect against the gcc bug mentioned above */
- val &= (~(0xffffffff << k));
- bits -= FLAC__BITS_PER_BLURB;
- }
- }
- else if(bits <= n) {
- bb->buffer[bb->blurbs] <<= bits;
- bb->buffer[bb->blurbs] |= val;
- if(bits == n) {
- bb->blurbs++;
- bb->bits = 0;
- }
- else
- bb->bits += bits;
- break;
- }
- else {
- k = bits - n;
- bb->buffer[bb->blurbs] <<= n;
- bb->buffer[bb->blurbs] |= (val >> k);
- /* we know n > 0 so k < 32 so no need to protect against the gcc bug mentioned above */
- val &= (~(0xffffffff << k));
- bits -= n;
- bb->blurbs++;
- bb->bits = 0;
- }
- }
- return true;
- }
- FLAC__bool FLAC__bitbuffer_write_raw_int32(FLAC__BitBuffer *bb, FLAC__int32 val, unsigned bits)
- {
- return FLAC__bitbuffer_write_raw_uint32(bb, (FLAC__uint32)val, bits);
- }
- FLAC__bool FLAC__bitbuffer_write_raw_uint64(FLAC__BitBuffer *bb, FLAC__uint64 val, unsigned bits)
- {
- static const FLAC__uint64 mask[] = {
- 0,
- FLAC__U64L(0x0000000000000001), FLAC__U64L(0x0000000000000003), FLAC__U64L(0x0000000000000007), FLAC__U64L(0x000000000000000F),
- FLAC__U64L(0x000000000000001F), FLAC__U64L(0x000000000000003F), FLAC__U64L(0x000000000000007F), FLAC__U64L(0x00000000000000FF),
- FLAC__U64L(0x00000000000001FF), FLAC__U64L(0x00000000000003FF), FLAC__U64L(0x00000000000007FF), FLAC__U64L(0x0000000000000FFF),
- FLAC__U64L(0x0000000000001FFF), FLAC__U64L(0x0000000000003FFF), FLAC__U64L(0x0000000000007FFF), FLAC__U64L(0x000000000000FFFF),
- FLAC__U64L(0x000000000001FFFF), FLAC__U64L(0x000000000003FFFF), FLAC__U64L(0x000000000007FFFF), FLAC__U64L(0x00000000000FFFFF),
- FLAC__U64L(0x00000000001FFFFF), FLAC__U64L(0x00000000003FFFFF), FLAC__U64L(0x00000000007FFFFF), FLAC__U64L(0x0000000000FFFFFF),
- FLAC__U64L(0x0000000001FFFFFF), FLAC__U64L(0x0000000003FFFFFF), FLAC__U64L(0x0000000007FFFFFF), FLAC__U64L(0x000000000FFFFFFF),
- FLAC__U64L(0x000000001FFFFFFF), FLAC__U64L(0x000000003FFFFFFF), FLAC__U64L(0x000000007FFFFFFF), FLAC__U64L(0x00000000FFFFFFFF),
- FLAC__U64L(0x00000001FFFFFFFF), FLAC__U64L(0x00000003FFFFFFFF), FLAC__U64L(0x00000007FFFFFFFF), FLAC__U64L(0x0000000FFFFFFFFF),
- FLAC__U64L(0x0000001FFFFFFFFF), FLAC__U64L(0x0000003FFFFFFFFF), FLAC__U64L(0x0000007FFFFFFFFF), FLAC__U64L(0x000000FFFFFFFFFF),
- FLAC__U64L(0x000001FFFFFFFFFF), FLAC__U64L(0x000003FFFFFFFFFF), FLAC__U64L(0x000007FFFFFFFFFF), FLAC__U64L(0x00000FFFFFFFFFFF),
- FLAC__U64L(0x00001FFFFFFFFFFF), FLAC__U64L(0x00003FFFFFFFFFFF), FLAC__U64L(0x00007FFFFFFFFFFF), FLAC__U64L(0x0000FFFFFFFFFFFF),
- FLAC__U64L(0x0001FFFFFFFFFFFF), FLAC__U64L(0x0003FFFFFFFFFFFF), FLAC__U64L(0x0007FFFFFFFFFFFF), FLAC__U64L(0x000FFFFFFFFFFFFF),
- FLAC__U64L(0x001FFFFFFFFFFFFF), FLAC__U64L(0x003FFFFFFFFFFFFF), FLAC__U64L(0x007FFFFFFFFFFFFF), FLAC__U64L(0x00FFFFFFFFFFFFFF),
- FLAC__U64L(0x01FFFFFFFFFFFFFF), FLAC__U64L(0x03FFFFFFFFFFFFFF), FLAC__U64L(0x07FFFFFFFFFFFFFF), FLAC__U64L(0x0FFFFFFFFFFFFFFF),
- FLAC__U64L(0x1FFFFFFFFFFFFFFF), FLAC__U64L(0x3FFFFFFFFFFFFFFF), FLAC__U64L(0x7FFFFFFFFFFFFFFF), FLAC__U64L(0xFFFFFFFFFFFFFFFF)
- };
- unsigned n, k;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 64);
- if(bits == 0)
- return true;
- if(!bitbuffer_ensure_size_(bb, bits))
- return false;
- val &= mask[bits];
- bb->total_bits += bits;
- while(bits > 0) {
- if(bb->bits == 0) {
- if(bits < FLAC__BITS_PER_BLURB) {
- bb->buffer[bb->blurbs] = (FLAC__blurb)val;
- bb->bits = bits;
- break;
- }
- else if(bits == FLAC__BITS_PER_BLURB) {
- bb->buffer[bb->blurbs++] = (FLAC__blurb)val;
- break;
- }
- else {
- k = bits - FLAC__BITS_PER_BLURB;
- bb->buffer[bb->blurbs++] = (FLAC__blurb)(val >> k);
- /* we know k < 64 so no need to protect against the gcc bug mentioned above */
- val &= (~(FLAC__U64L(0xffffffffffffffff) << k));
- bits -= FLAC__BITS_PER_BLURB;
- }
- }
- else {
- n = min(FLAC__BITS_PER_BLURB - bb->bits, bits);
- k = bits - n;
- bb->buffer[bb->blurbs] <<= n;
- bb->buffer[bb->blurbs] |= (val >> k);
- /* we know n > 0 so k < 64 so no need to protect against the gcc bug mentioned above */
- val &= (~(FLAC__U64L(0xffffffffffffffff) << k));
- bits -= n;
- bb->bits += n;
- if(bb->bits == FLAC__BITS_PER_BLURB) {
- bb->blurbs++;
- bb->bits = 0;
- }
- }
- }
- return true;
- }
- #if 0 /* UNUSED */
- FLAC__bool FLAC__bitbuffer_write_raw_int64(FLAC__BitBuffer *bb, FLAC__int64 val, unsigned bits)
- {
- return FLAC__bitbuffer_write_raw_uint64(bb, (FLAC__uint64)val, bits);
- }
- #endif
- FLaC__INLINE FLAC__bool FLAC__bitbuffer_write_raw_uint32_little_endian(FLAC__BitBuffer *bb, FLAC__uint32 val)
- {
- /* this doesn't need to be that fast as currently it is only used for vorbis comments */
- /* NOTE: we rely on the fact that FLAC__bitbuffer_write_raw_uint32() masks out the unused bits */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, val, 8))
- return false;
- if(!FLAC__bitbuffer_write_raw_uint32(bb, val>>8, 8))
- return false;
- if(!FLAC__bitbuffer_write_raw_uint32(bb, val>>16, 8))
- return false;
- if(!FLAC__bitbuffer_write_raw_uint32(bb, val>>24, 8))
- return false;
- return true;
- }
- FLaC__INLINE FLAC__bool FLAC__bitbuffer_write_byte_block(FLAC__BitBuffer *bb, const FLAC__byte vals[], unsigned nvals)
- {
- unsigned i;
- /* this could be faster but currently we don't need it to be */
- for(i = 0; i < nvals; i++) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, (FLAC__uint32)(vals[i]), 8))
- return false;
- }
- return true;
- }
- FLAC__bool FLAC__bitbuffer_write_unary_unsigned(FLAC__BitBuffer *bb, unsigned val)
- {
- if(val < 32)
- return FLAC__bitbuffer_write_raw_uint32(bb, 1, ++val);
- else if(val < 64)
- return FLAC__bitbuffer_write_raw_uint64(bb, 1, ++val);
- else {
- if(!FLAC__bitbuffer_write_zeroes(bb, val))
- return false;
- return FLAC__bitbuffer_write_raw_uint32(bb, 1, 1);
- }
- }
- unsigned FLAC__bitbuffer_rice_bits(int val, unsigned parameter)
- {
- unsigned msbs, uval;
- /* fold signed to unsigned */
- if(val < 0)
- /* equivalent to
- * (unsigned)(((--val) << 1) - 1);
- * but without the overflow problem at MININT
- */
- uval = (unsigned)(((-(++val)) << 1) + 1);
- else
- uval = (unsigned)(val << 1);
- msbs = uval >> parameter;
- return 1 + parameter + msbs;
- }
- #if 0 /* UNUSED */
- unsigned FLAC__bitbuffer_golomb_bits_signed(int val, unsigned parameter)
- {
- unsigned bits, msbs, uval;
- unsigned k;
- FLAC__ASSERT(parameter > 0);
- /* fold signed to unsigned */
- if(val < 0)
- /* equivalent to
- * (unsigned)(((--val) << 1) - 1);
- * but without the overflow problem at MININT
- */
- uval = (unsigned)(((-(++val)) << 1) + 1);
- else
- uval = (unsigned)(val << 1);
- k = FLAC__bitmath_ilog2(parameter);
- if(parameter == 1u<<k) {
- FLAC__ASSERT(k <= 30);
- msbs = uval >> k;
- bits = 1 + k + msbs;
- }
- else {
- unsigned q, r, d;
- d = (1 << (k+1)) - parameter;
- q = uval / parameter;
- r = uval - (q * parameter);
- bits = 1 + q + k;
- if(r >= d)
- bits++;
- }
- return bits;
- }
- unsigned FLAC__bitbuffer_golomb_bits_unsigned(unsigned uval, unsigned parameter)
- {
- unsigned bits, msbs;
- unsigned k;
- FLAC__ASSERT(parameter > 0);
- k = FLAC__bitmath_ilog2(parameter);
- if(parameter == 1u<<k) {
- FLAC__ASSERT(k <= 30);
- msbs = uval >> k;
- bits = 1 + k + msbs;
- }
- else {
- unsigned q, r, d;
- d = (1 << (k+1)) - parameter;
- q = uval / parameter;
- r = uval - (q * parameter);
- bits = 1 + q + k;
- if(r >= d)
- bits++;
- }
- return bits;
- }
- #endif /* UNUSED */
- #ifdef FLAC__SYMMETRIC_RICE
- FLAC__bool FLAC__bitbuffer_write_symmetric_rice_signed(FLAC__BitBuffer *bb, int val, unsigned parameter)
- {
- unsigned total_bits, interesting_bits, msbs;
- FLAC__uint32 pattern;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 31);
- /* init pattern with the unary end bit and the sign bit */
- if(val < 0) {
- pattern = 3;
- val = -val;
- }
- else
- pattern = 2;
- msbs = val >> parameter;
- interesting_bits = 2 + parameter;
- total_bits = interesting_bits + msbs;
- pattern <<= parameter;
- pattern |= (val & ((1<<parameter)-1)); /* the binary LSBs */
- if(total_bits <= 32) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, total_bits))
- return false;
- }
- else {
- /* write the unary MSBs */
- if(!FLAC__bitbuffer_write_zeroes(bb, msbs))
- return false;
- /* write the unary end bit, the sign bit, and binary LSBs */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, interesting_bits))
- return false;
- }
- return true;
- }
- #if 0 /* UNUSED */
- FLAC__bool FLAC__bitbuffer_write_symmetric_rice_signed_guarded(FLAC__BitBuffer *bb, int val, unsigned parameter, unsigned max_bits, FLAC__bool *overflow)
- {
- unsigned total_bits, interesting_bits, msbs;
- FLAC__uint32 pattern;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 31);
- *overflow = false;
- /* init pattern with the unary end bit and the sign bit */
- if(val < 0) {
- pattern = 3;
- val = -val;
- }
- else
- pattern = 2;
- msbs = val >> parameter;
- interesting_bits = 2 + parameter;
- total_bits = interesting_bits + msbs;
- pattern <<= parameter;
- pattern |= (val & ((1<<parameter)-1)); /* the binary LSBs */
- if(total_bits <= 32) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, total_bits))
- return false;
- }
- else if(total_bits > max_bits) {
- *overflow = true;
- return true;
- }
- else {
- /* write the unary MSBs */
- if(!FLAC__bitbuffer_write_zeroes(bb, msbs))
- return false;
- /* write the unary end bit, the sign bit, and binary LSBs */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, interesting_bits))
- return false;
- }
- return true;
- }
- #endif /* UNUSED */
- FLAC__bool FLAC__bitbuffer_write_symmetric_rice_signed_escape(FLAC__BitBuffer *bb, int val, unsigned parameter)
- {
- unsigned total_bits, val_bits;
- FLAC__uint32 pattern;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 31);
- val_bits = FLAC__bitmath_silog2(val);
- total_bits = 2 + parameter + 5 + val_bits;
- if(total_bits <= 32) {
- pattern = 3;
- pattern <<= (parameter + 5);
- pattern |= val_bits;
- pattern <<= val_bits;
- pattern |= (val & ((1 << val_bits) - 1));
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, total_bits))
- return false;
- }
- else {
- /* write the '-0' escape code first */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, 3u << parameter, 2+parameter))
- return false;
- /* write the length */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, val_bits, 5))
- return false;
- /* write the value */
- if(!FLAC__bitbuffer_write_raw_int32(bb, val, val_bits))
- return false;
- }
- return true;
- }
- #endif /* ifdef FLAC__SYMMETRIC_RICE */
- FLAC__bool FLAC__bitbuffer_write_rice_signed(FLAC__BitBuffer *bb, int val, unsigned parameter)
- {
- unsigned total_bits, interesting_bits, msbs, uval;
- FLAC__uint32 pattern;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 30);
- /* fold signed to unsigned */
- if(val < 0)
- /* equivalent to
- * (unsigned)(((--val) << 1) - 1);
- * but without the overflow problem at MININT
- */
- uval = (unsigned)(((-(++val)) << 1) + 1);
- else
- uval = (unsigned)(val << 1);
- msbs = uval >> parameter;
- interesting_bits = 1 + parameter;
- total_bits = interesting_bits + msbs;
- pattern = 1 << parameter; /* the unary end bit */
- pattern |= (uval & ((1<<parameter)-1)); /* the binary LSBs */
- if(total_bits <= 32) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, total_bits))
- return false;
- }
- else {
- /* write the unary MSBs */
- if(!FLAC__bitbuffer_write_zeroes(bb, msbs))
- return false;
- /* write the unary end bit and binary LSBs */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, interesting_bits))
- return false;
- }
- return true;
- }
- #if 0 /* UNUSED */
- FLAC__bool FLAC__bitbuffer_write_rice_signed_guarded(FLAC__BitBuffer *bb, int val, unsigned parameter, unsigned max_bits, FLAC__bool *overflow)
- {
- unsigned total_bits, interesting_bits, msbs, uval;
- FLAC__uint32 pattern;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 30);
- *overflow = false;
- /* fold signed to unsigned */
- if(val < 0)
- /* equivalent to
- * (unsigned)(((--val) << 1) - 1);
- * but without the overflow problem at MININT
- */
- uval = (unsigned)(((-(++val)) << 1) + 1);
- else
- uval = (unsigned)(val << 1);
- msbs = uval >> parameter;
- interesting_bits = 1 + parameter;
- total_bits = interesting_bits + msbs;
- pattern = 1 << parameter; /* the unary end bit */
- pattern |= (uval & ((1<<parameter)-1)); /* the binary LSBs */
- if(total_bits <= 32) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, total_bits))
- return false;
- }
- else if(total_bits > max_bits) {
- *overflow = true;
- return true;
- }
- else {
- /* write the unary MSBs */
- if(!FLAC__bitbuffer_write_zeroes(bb, msbs))
- return false;
- /* write the unary end bit and binary LSBs */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, interesting_bits))
- return false;
- }
- return true;
- }
- #endif /* UNUSED */
- #if 0 /* UNUSED */
- FLAC__bool FLAC__bitbuffer_write_golomb_signed(FLAC__BitBuffer *bb, int val, unsigned parameter)
- {
- unsigned total_bits, msbs, uval;
- unsigned k;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter > 0);
- /* fold signed to unsigned */
- if(val < 0)
- /* equivalent to
- * (unsigned)(((--val) << 1) - 1);
- * but without the overflow problem at MININT
- */
- uval = (unsigned)(((-(++val)) << 1) + 1);
- else
- uval = (unsigned)(val << 1);
- k = FLAC__bitmath_ilog2(parameter);
- if(parameter == 1u<<k) {
- unsigned pattern;
- FLAC__ASSERT(k <= 30);
- msbs = uval >> k;
- total_bits = 1 + k + msbs;
- pattern = 1 << k; /* the unary end bit */
- pattern |= (uval & ((1u<<k)-1)); /* the binary LSBs */
- if(total_bits <= 32) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, total_bits))
- return false;
- }
- else {
- /* write the unary MSBs */
- if(!FLAC__bitbuffer_write_zeroes(bb, msbs))
- return false;
- /* write the unary end bit and binary LSBs */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, k+1))
- return false;
- }
- }
- else {
- unsigned q, r, d;
- d = (1 << (k+1)) - parameter;
- q = uval / parameter;
- r = uval - (q * parameter);
- /* write the unary MSBs */
- if(!FLAC__bitbuffer_write_zeroes(bb, q))
- return false;
- /* write the unary end bit */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, 1, 1))
- return false;
- /* write the binary LSBs */
- if(r >= d) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, r+d, k+1))
- return false;
- }
- else {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, r, k))
- return false;
- }
- }
- return true;
- }
- FLAC__bool FLAC__bitbuffer_write_golomb_unsigned(FLAC__BitBuffer *bb, unsigned uval, unsigned parameter)
- {
- unsigned total_bits, msbs;
- unsigned k;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter > 0);
- k = FLAC__bitmath_ilog2(parameter);
- if(parameter == 1u<<k) {
- unsigned pattern;
- FLAC__ASSERT(k <= 30);
- msbs = uval >> k;
- total_bits = 1 + k + msbs;
- pattern = 1 << k; /* the unary end bit */
- pattern |= (uval & ((1u<<k)-1)); /* the binary LSBs */
- if(total_bits <= 32) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, total_bits))
- return false;
- }
- else {
- /* write the unary MSBs */
- if(!FLAC__bitbuffer_write_zeroes(bb, msbs))
- return false;
- /* write the unary end bit and binary LSBs */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, pattern, k+1))
- return false;
- }
- }
- else {
- unsigned q, r, d;
- d = (1 << (k+1)) - parameter;
- q = uval / parameter;
- r = uval - (q * parameter);
- /* write the unary MSBs */
- if(!FLAC__bitbuffer_write_zeroes(bb, q))
- return false;
- /* write the unary end bit */
- if(!FLAC__bitbuffer_write_raw_uint32(bb, 1, 1))
- return false;
- /* write the binary LSBs */
- if(r >= d) {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, r+d, k+1))
- return false;
- }
- else {
- if(!FLAC__bitbuffer_write_raw_uint32(bb, r, k))
- return false;
- }
- }
- return true;
- }
- #endif /* UNUSED */
- FLAC__bool FLAC__bitbuffer_write_utf8_uint32(FLAC__BitBuffer *bb, FLAC__uint32 val)
- {
- FLAC__bool ok = 1;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(!(val & 0x80000000)); /* this version only handles 31 bits */
- if(val < 0x80) {
- return FLAC__bitbuffer_write_raw_uint32(bb, val, 8);
- }
- else if(val < 0x800) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xC0 | (val>>6), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (val&0x3F), 8);
- }
- else if(val < 0x10000) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xE0 | (val>>12), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (val&0x3F), 8);
- }
- else if(val < 0x200000) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xF0 | (val>>18), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>12)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (val&0x3F), 8);
- }
- else if(val < 0x4000000) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xF8 | (val>>24), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>18)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>12)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (val&0x3F), 8);
- }
- else {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xFC | (val>>30), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>24)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>18)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>12)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | ((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (val&0x3F), 8);
- }
- return ok;
- }
- FLAC__bool FLAC__bitbuffer_write_utf8_uint64(FLAC__BitBuffer *bb, FLAC__uint64 val)
- {
- FLAC__bool ok = 1;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(!(val & FLAC__U64L(0xFFFFFFF000000000))); /* this version only handles 36 bits */
- if(val < 0x80) {
- return FLAC__bitbuffer_write_raw_uint32(bb, (FLAC__uint32)val, 8);
- }
- else if(val < 0x800) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xC0 | (FLAC__uint32)(val>>6), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)(val&0x3F), 8);
- }
- else if(val < 0x10000) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xE0 | (FLAC__uint32)(val>>12), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)(val&0x3F), 8);
- }
- else if(val < 0x200000) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xF0 | (FLAC__uint32)(val>>18), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)(val&0x3F), 8);
- }
- else if(val < 0x4000000) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xF8 | (FLAC__uint32)(val>>24), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)(val&0x3F), 8);
- }
- else if(val < 0x80000000) {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xFC | (FLAC__uint32)(val>>30), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>24)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)(val&0x3F), 8);
- }
- else {
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0xFE, 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>30)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>24)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>18)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>12)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)((val>>6)&0x3F), 8);
- ok &= FLAC__bitbuffer_write_raw_uint32(bb, 0x80 | (FLAC__uint32)(val&0x3F), 8);
- }
- return ok;
- }
- FLAC__bool FLAC__bitbuffer_zero_pad_to_byte_boundary(FLAC__BitBuffer *bb)
- {
- /* 0-pad to byte boundary */
- if(bb->bits & 7u)
- return FLAC__bitbuffer_write_zeroes(bb, 8 - (bb->bits & 7u));
- else
- return true;
- }
- FLAC__bool FLAC__bitbuffer_peek_bit(FLAC__BitBuffer *bb, unsigned *val, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- /* to avoid a drastic speed penalty we don't:
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bb->bits == 0);
- */
- while(1) {
- if(bb->total_consumed_bits < bb->total_bits) {
- *val = (bb->buffer[bb->consumed_blurbs] & BLURB_BIT_TO_MASK(bb->consumed_bits))? 1 : 0;
- return true;
- }
- else {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- }
- }
- FLAC__bool FLAC__bitbuffer_read_bit(FLAC__BitBuffer *bb, unsigned *val, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- /* to avoid a drastic speed penalty we don't:
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bb->bits == 0);
- */
- while(1) {
- if(bb->total_consumed_bits < bb->total_bits) {
- *val = (bb->buffer[bb->consumed_blurbs] & BLURB_BIT_TO_MASK(bb->consumed_bits))? 1 : 0;
- bb->consumed_bits++;
- if(bb->consumed_bits == FLAC__BITS_PER_BLURB) {
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- }
- bb->total_consumed_bits++;
- return true;
- }
- else {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- }
- }
- FLAC__bool FLAC__bitbuffer_read_bit_to_uint32(FLAC__BitBuffer *bb, FLAC__uint32 *val, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- /* to avoid a drastic speed penalty we don't:
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bb->bits == 0);
- */
- while(1) {
- if(bb->total_consumed_bits < bb->total_bits) {
- *val <<= 1;
- *val |= (bb->buffer[bb->consumed_blurbs] & BLURB_BIT_TO_MASK(bb->consumed_bits))? 1 : 0;
- bb->consumed_bits++;
- if(bb->consumed_bits == FLAC__BITS_PER_BLURB) {
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- }
- bb->total_consumed_bits++;
- return true;
- }
- else {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- }
- }
- FLAC__bool FLAC__bitbuffer_read_bit_to_uint64(FLAC__BitBuffer *bb, FLAC__uint64 *val, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- /* to avoid a drastic speed penalty we don't:
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bb->bits == 0);
- */
- while(1) {
- if(bb->total_consumed_bits < bb->total_bits) {
- *val <<= 1;
- *val |= (bb->buffer[bb->consumed_blurbs] & BLURB_BIT_TO_MASK(bb->consumed_bits))? 1 : 0;
- bb->consumed_bits++;
- if(bb->consumed_bits == FLAC__BITS_PER_BLURB) {
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- }
- bb->total_consumed_bits++;
- return true;
- }
- else {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- }
- }
- FLaC__INLINE FLAC__bool FLAC__bitbuffer_read_raw_uint32(FLAC__BitBuffer *bb, FLAC__uint32 *val, const unsigned bits, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- #ifdef FLAC__NO_MANUAL_INLINING
- {
- unsigned i;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 32);
- *val = 0;
- for(i = 0; i < bits; i++) {
- if(!FLAC__bitbuffer_read_bit_to_uint32(bb, val, read_callback, client_data))
- return false;
- }
- return true;
- }
- #else
- {
- unsigned i, bits_ = bits;
- FLAC__uint32 v = 0;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 32);
- FLAC__ASSERT((bb->capacity*FLAC__BITS_PER_BLURB) * 2 >= bits);
- if(bits == 0) {
- *val = 0;
- return true;
- }
- while(bb->total_consumed_bits + bits > bb->total_bits) {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- #if FLAC__BITS_PER_BLURB > 8
- if(bb->bits == 0 || bb->consumed_blurbs < bb->blurbs) { /*@@@ comment on why this is here*/
- #endif
- if(bb->consumed_bits) {
- i = FLAC__BITS_PER_BLURB - bb->consumed_bits;
- if(i <= bits_) {
- v = bb->buffer[bb->consumed_blurbs] & (FLAC__BLURB_ALL_ONES >> bb->consumed_bits);
- bits_ -= i;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- else {
- *val = (bb->buffer[bb->consumed_blurbs] & (FLAC__BLURB_ALL_ONES >> bb->consumed_bits)) >> (i-bits_);
- bb->consumed_bits += bits_;
- bb->total_consumed_bits += bits_;
- return true;
- }
- }
- #if FLAC__BITS_PER_BLURB == 32
- /* note that we know bits_ cannot be > 32 because of previous assertions */
- if(bits_ == FLAC__BITS_PER_BLURB) {
- v = bb->buffer[bb->consumed_blurbs];
- CRC16_UPDATE_BLURB(bb, v, bb->read_crc16);
- bb->consumed_blurbs++;
- /* bb->consumed_bits is already 0 */
- bb->total_consumed_bits += bits;
- *val = v;
- return true;
- }
- #else
- while(bits_ >= FLAC__BITS_PER_BLURB) {
- v <<= FLAC__BITS_PER_BLURB;
- v |= bb->buffer[bb->consumed_blurbs];
- bits_ -= FLAC__BITS_PER_BLURB;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- /* bb->consumed_bits is already 0 */
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- #endif
- if(bits_ > 0) {
- v <<= bits_;
- v |= (bb->buffer[bb->consumed_blurbs] >> (FLAC__BITS_PER_BLURB-bits_));
- bb->consumed_bits = bits_;
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- bb->total_consumed_bits += bits;
- *val = v;
- #if FLAC__BITS_PER_BLURB > 8
- }
- else {
- *val = 0;
- for(i = 0; i < bits; i++) {
- if(!FLAC__bitbuffer_read_bit_to_uint32(bb, val, read_callback, client_data))
- return false;
- }
- }
- #endif
- return true;
- }
- #endif
- FLAC__bool FLAC__bitbuffer_read_raw_int32(FLAC__BitBuffer *bb, FLAC__int32 *val, const unsigned bits, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- #ifdef FLAC__NO_MANUAL_INLINING
- {
- unsigned i;
- FLAC__uint32 v;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 32);
- if(bits == 0) {
- *val = 0;
- return true;
- }
- v = 0;
- for(i = 0; i < bits; i++) {
- if(!FLAC__bitbuffer_read_bit_to_uint32(bb, &v, read_callback, client_data))
- return false;
- }
- /* fix the sign */
- i = 32 - bits;
- if(i) {
- v <<= i;
- *val = (FLAC__int32)v;
- *val >>= i;
- }
- else
- *val = (FLAC__int32)v;
- return true;
- }
- #else
- {
- unsigned i, bits_ = bits;
- FLAC__uint32 v = 0;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 32);
- FLAC__ASSERT((bb->capacity*FLAC__BITS_PER_BLURB) * 2 >= bits);
- if(bits == 0) {
- *val = 0;
- return true;
- }
- while(bb->total_consumed_bits + bits > bb->total_bits) {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- #if FLAC__BITS_PER_BLURB > 8
- if(bb->bits == 0 || bb->consumed_blurbs < bb->blurbs) { /*@@@ comment on why this is here*/
- #endif
- if(bb->consumed_bits) {
- i = FLAC__BITS_PER_BLURB - bb->consumed_bits;
- if(i <= bits_) {
- v = bb->buffer[bb->consumed_blurbs] & (FLAC__BLURB_ALL_ONES >> bb->consumed_bits);
- bits_ -= i;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- else {
- /* bits_ must be < FLAC__BITS_PER_BLURB-1 if we get to here */
- v = (bb->buffer[bb->consumed_blurbs] & (FLAC__BLURB_ALL_ONES >> bb->consumed_bits));
- v <<= (32-i);
- *val = (FLAC__int32)v;
- *val >>= (32-bits_);
- bb->consumed_bits += bits_;
- bb->total_consumed_bits += bits_;
- return true;
- }
- }
- #if FLAC__BITS_PER_BLURB == 32
- /* note that we know bits_ cannot be > 32 because of previous assertions */
- if(bits_ == FLAC__BITS_PER_BLURB) {
- v = bb->buffer[bb->consumed_blurbs];
- bits_ = 0;
- CRC16_UPDATE_BLURB(bb, v, bb->read_crc16);
- bb->consumed_blurbs++;
- /* bb->consumed_bits is already 0 */
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- #else
- while(bits_ >= FLAC__BITS_PER_BLURB) {
- v <<= FLAC__BITS_PER_BLURB;
- v |= bb->buffer[bb->consumed_blurbs];
- bits_ -= FLAC__BITS_PER_BLURB;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- /* bb->consumed_bits is already 0 */
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- #endif
- if(bits_ > 0) {
- v <<= bits_;
- v |= (bb->buffer[bb->consumed_blurbs] >> (FLAC__BITS_PER_BLURB-bits_));
- bb->consumed_bits = bits_;
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- bb->total_consumed_bits += bits;
- #if FLAC__BITS_PER_BLURB > 8
- }
- else {
- for(i = 0; i < bits; i++) {
- if(!FLAC__bitbuffer_read_bit_to_uint32(bb, &v, read_callback, client_data))
- return false;
- }
- }
- #endif
- /* fix the sign */
- i = 32 - bits;
- if(i) {
- v <<= i;
- *val = (FLAC__int32)v;
- *val >>= i;
- }
- else
- *val = (FLAC__int32)v;
- return true;
- }
- #endif
- FLAC__bool FLAC__bitbuffer_read_raw_uint64(FLAC__BitBuffer *bb, FLAC__uint64 *val, const unsigned bits, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- #ifdef FLAC__NO_MANUAL_INLINING
- {
- unsigned i;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 64);
- *val = 0;
- for(i = 0; i < bits; i++) {
- if(!FLAC__bitbuffer_read_bit_to_uint64(bb, val, read_callback, client_data))
- return false;
- }
- return true;
- }
- #else
- {
- unsigned i, bits_ = bits;
- FLAC__uint64 v = 0;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 64);
- FLAC__ASSERT((bb->capacity*FLAC__BITS_PER_BLURB) * 2 >= bits);
- if(bits == 0) {
- *val = 0;
- return true;
- }
- while(bb->total_consumed_bits + bits > bb->total_bits) {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- #if FLAC__BITS_PER_BLURB > 8
- if(bb->bits == 0 || bb->consumed_blurbs < bb->blurbs) { /*@@@ comment on why this is here*/
- #endif
- if(bb->consumed_bits) {
- i = FLAC__BITS_PER_BLURB - bb->consumed_bits;
- if(i <= bits_) {
- v = bb->buffer[bb->consumed_blurbs] & (FLAC__BLURB_ALL_ONES >> bb->consumed_bits);
- bits_ -= i;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- else {
- *val = (bb->buffer[bb->consumed_blurbs] & (FLAC__BLURB_ALL_ONES >> bb->consumed_bits)) >> (i-bits_);
- bb->consumed_bits += bits_;
- bb->total_consumed_bits += bits_;
- return true;
- }
- }
- while(bits_ >= FLAC__BITS_PER_BLURB) {
- v <<= FLAC__BITS_PER_BLURB;
- v |= bb->buffer[bb->consumed_blurbs];
- bits_ -= FLAC__BITS_PER_BLURB;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- /* bb->consumed_bits is already 0 */
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- if(bits_ > 0) {
- v <<= bits_;
- v |= (bb->buffer[bb->consumed_blurbs] >> (FLAC__BITS_PER_BLURB-bits_));
- bb->consumed_bits = bits_;
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- bb->total_consumed_bits += bits;
- *val = v;
- #if FLAC__BITS_PER_BLURB > 8
- }
- else {
- *val = 0;
- for(i = 0; i < bits; i++) {
- if(!FLAC__bitbuffer_read_bit_to_uint64(bb, val, read_callback, client_data))
- return false;
- }
- }
- #endif
- return true;
- }
- #endif
- #if 0 /* UNUSED */
- FLAC__bool FLAC__bitbuffer_read_raw_int64(FLAC__BitBuffer *bb, FLAC__int64 *val, const unsigned bits, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- #ifdef FLAC__NO_MANUAL_INLINING
- {
- unsigned i;
- FLAC__uint64 v;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 64);
- v = 0;
- for(i = 0; i < bits; i++) {
- if(!FLAC__bitbuffer_read_bit_to_uint64(bb, &v, read_callback, client_data))
- return false;
- }
- /* fix the sign */
- i = 64 - bits;
- if(i) {
- v <<= i;
- *val = (FLAC__int64)v;
- *val >>= i;
- }
- else
- *val = (FLAC__int64)v;
- return true;
- }
- #else
- {
- unsigned i, bits_ = bits;
- FLAC__uint64 v = 0;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(bits <= 64);
- FLAC__ASSERT((bb->capacity*FLAC__BITS_PER_BLURB) * 2 >= bits);
- if(bits == 0) {
- *val = 0;
- return true;
- }
- while(bb->total_consumed_bits + bits > bb->total_bits) {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- #if FLAC__BITS_PER_BLURB > 8
- if(bb->bits == 0 || bb->consumed_blurbs < bb->blurbs) { /*@@@ comment on why this is here*/
- #endif
- if(bb->consumed_bits) {
- i = FLAC__BITS_PER_BLURB - bb->consumed_bits;
- if(i <= bits_) {
- v = bb->buffer[bb->consumed_blurbs] & (FLAC__BLURB_ALL_ONES >> bb->consumed_bits);
- bits_ -= i;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- else {
- /* bits_ must be < FLAC__BITS_PER_BLURB-1 if we get to here */
- v = (bb->buffer[bb->consumed_blurbs] & (FLAC__BLURB_ALL_ONES >> bb->consumed_bits));
- v <<= (64-i);
- *val = (FLAC__int64)v;
- *val >>= (64-bits_);
- bb->consumed_bits += bits_;
- bb->total_consumed_bits += bits_;
- return true;
- }
- }
- while(bits_ >= FLAC__BITS_PER_BLURB) {
- v <<= FLAC__BITS_PER_BLURB;
- v |= bb->buffer[bb->consumed_blurbs];
- bits_ -= FLAC__BITS_PER_BLURB;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- /* bb->consumed_bits is already 0 */
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- if(bits_ > 0) {
- v <<= bits_;
- v |= (bb->buffer[bb->consumed_blurbs] >> (FLAC__BITS_PER_BLURB-bits_));
- bb->consumed_bits = bits_;
- /* we hold off updating bb->total_consumed_bits until the end */
- }
- bb->total_consumed_bits += bits;
- #if FLAC__BITS_PER_BLURB > 8
- }
- else {
- for(i = 0; i < bits; i++) {
- if(!FLAC__bitbuffer_read_bit_to_uint64(bb, &v, read_callback, client_data))
- return false;
- }
- }
- #endif
- /* fix the sign */
- i = 64 - bits;
- if(i) {
- v <<= i;
- *val = (FLAC__int64)v;
- *val >>= i;
- }
- else
- *val = (FLAC__int64)v;
- return true;
- }
- #endif
- #endif
- FLaC__INLINE FLAC__bool FLAC__bitbuffer_read_raw_uint32_little_endian(FLAC__BitBuffer *bb, FLAC__uint32 *val, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- FLAC__uint32 x8, x32 = 0;
- /* this doesn't need to be that fast as currently it is only used for vorbis comments */
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x32, 8, read_callback, client_data))
- return false;
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x8, 8, read_callback, client_data))
- return false;
- x32 |= (x8 << 8);
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x8, 8, read_callback, client_data))
- return false;
- x32 |= (x8 << 16);
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x8, 8, read_callback, client_data))
- return false;
- x32 |= (x8 << 24);
- *val = x32;
- return true;
- }
- FLAC__bool FLAC__bitbuffer_skip_bits_no_crc(FLAC__BitBuffer *bb, unsigned bits, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- /*
- * @@@ a slightly faster implementation is possible but
- * probably not that useful since this is only called a
- * couple of times in the metadata readers.
- */
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- if(bits > 0) {
- const unsigned n = bb->consumed_bits & 7;
- unsigned m;
- FLAC__uint32 x;
- if(n != 0) {
- m = min(8-n, bits);
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x, m, read_callback, client_data))
- return false;
- bits -= m;
- }
- m = bits / 8;
- if(m > 0) {
- if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(bb, 0, m, read_callback, client_data))
- return false;
- bits %= 8;
- }
- if(bits > 0) {
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x, bits, read_callback, client_data))
- return false;
- }
- }
- return true;
- }
- FLAC__bool FLAC__bitbuffer_read_byte_block_aligned_no_crc(FLAC__BitBuffer *bb, FLAC__byte *val, unsigned nvals, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(FLAC__bitbuffer_is_byte_aligned(bb));
- FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(bb));
- #if FLAC__BITS_PER_BLURB == 8
- while(nvals > 0) {
- unsigned chunk = min(nvals, bb->blurbs - bb->consumed_blurbs);
- if(chunk == 0) {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- }
- else {
- if(0 != val) {
- memcpy(val, bb->buffer + bb->consumed_blurbs, FLAC__BYTES_PER_BLURB * chunk);
- val += FLAC__BYTES_PER_BLURB * chunk;
- }
- nvals -= chunk;
- bb->consumed_blurbs += chunk;
- bb->total_consumed_bits = (bb->consumed_blurbs << FLAC__BITS_PER_BLURB_LOG2);
- }
- }
- #else
- @@@ need to write this still
- FLAC__ASSERT(0);
- #endif
- return true;
- }
- FLaC__INLINE FLAC__bool FLAC__bitbuffer_read_unary_unsigned(FLAC__BitBuffer *bb, unsigned *val, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- #ifdef FLAC__NO_MANUAL_INLINING
- {
- unsigned bit, val_ = 0;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- while(1) {
- if(!FLAC__bitbuffer_read_bit(bb, &bit, read_callback, client_data))
- return false;
- if(bit)
- break;
- else
- val_++;
- }
- *val = val_;
- return true;
- }
- #else
- {
- unsigned i, val_ = 0;
- unsigned total_blurbs_ = (bb->total_bits + (FLAC__BITS_PER_BLURB-1)) / FLAC__BITS_PER_BLURB;
- FLAC__blurb b;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- #if FLAC__BITS_PER_BLURB > 8
- if(bb->bits == 0 || bb->consumed_blurbs < bb->blurbs) { /*@@@ comment on why this is here*/
- #endif
- if(bb->consumed_bits) {
- b = bb->buffer[bb->consumed_blurbs] << bb->consumed_bits;
- if(b) {
- for(i = 0; !(b & FLAC__BLURB_TOP_BIT_ONE); i++)
- b <<= 1;
- *val = i;
- i++;
- bb->consumed_bits += i;
- bb->total_consumed_bits += i;
- if(bb->consumed_bits == FLAC__BITS_PER_BLURB) {
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- }
- return true;
- }
- else {
- val_ = FLAC__BITS_PER_BLURB - bb->consumed_bits;
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- bb->total_consumed_bits += val_;
- }
- }
- while(1) {
- if(bb->consumed_blurbs >= total_blurbs_) {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- total_blurbs_ = (bb->total_bits + (FLAC__BITS_PER_BLURB-1)) / FLAC__BITS_PER_BLURB;
- }
- b = bb->buffer[bb->consumed_blurbs];
- if(b) {
- for(i = 0; !(b & FLAC__BLURB_TOP_BIT_ONE); i++)
- b <<= 1;
- val_ += i;
- i++;
- bb->consumed_bits = i;
- *val = val_;
- if(i == FLAC__BITS_PER_BLURB) {
- CRC16_UPDATE_BLURB(bb, bb->buffer[bb->consumed_blurbs], bb->read_crc16);
- bb->consumed_blurbs++;
- bb->consumed_bits = 0;
- }
- bb->total_consumed_bits += i;
- return true;
- }
- else {
- val_ += FLAC__BITS_PER_BLURB;
- CRC16_UPDATE_BLURB(bb, 0, bb->read_crc16);
- bb->consumed_blurbs++;
- /* bb->consumed_bits is already 0 */
- bb->total_consumed_bits += FLAC__BITS_PER_BLURB;
- }
- }
- #if FLAC__BITS_PER_BLURB > 8
- }
- else {
- while(1) {
- if(!FLAC__bitbuffer_read_bit(bb, &i, read_callback, client_data))
- return false;
- if(i)
- break;
- else
- val_++;
- }
- *val = val_;
- return true;
- }
- #endif
- }
- #endif
- #ifdef FLAC__SYMMETRIC_RICE
- FLAC__bool FLAC__bitbuffer_read_symmetric_rice_signed(FLAC__BitBuffer *bb, int *val, unsigned parameter, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- FLAC__uint32 sign = 0, lsbs = 0, msbs = 0;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 31);
- /* read the unary MSBs and end bit */
- if(!FLAC__bitbuffer_read_unary_unsigned(bb, &msbs, read_callback, client_data))
- return false;
- /* read the sign bit */
- if(!FLAC__bitbuffer_read_bit_to_uint32(bb, &sign, read_callback, client_data))
- return false;
- /* read the binary LSBs */
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &lsbs, parameter, read_callback, client_data))
- return false;
- /* compose the value */
- *val = (msbs << parameter) | lsbs;
- if(sign)
- *val = -(*val);
- return true;
- }
- #endif /* ifdef FLAC__SYMMETRIC_RICE */
- FLAC__bool FLAC__bitbuffer_read_rice_signed(FLAC__BitBuffer *bb, int *val, unsigned parameter, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- FLAC__uint32 lsbs = 0, msbs = 0;
- unsigned uval;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 31);
- /* read the unary MSBs and end bit */
- if(!FLAC__bitbuffer_read_unary_unsigned(bb, &msbs, read_callback, client_data))
- return false;
- /* read the binary LSBs */
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &lsbs, parameter, read_callback, client_data))
- return false;
- /* compose the value */
- uval = (msbs << parameter) | lsbs;
- if(uval & 1)
- *val = -((int)(uval >> 1)) - 1;
- else
- *val = (int)(uval >> 1);
- return true;
- }
- FLAC__bool FLAC__bitbuffer_read_rice_signed_block(FLAC__BitBuffer *bb, int vals[], unsigned nvals, unsigned parameter, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- #ifdef FLAC__OLD_MSVC_FLAVOR
- {
- const FLAC__blurb *buffer = bb->buffer;
- unsigned i, j, val_i = 0;
- unsigned cbits = 0, uval = 0, msbs = 0, lsbs_left = 0;
- FLAC__blurb blurb, save_blurb;
- unsigned state = 0; /* 0 = getting unary MSBs, 1 = getting binary LSBs */
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 31);
- if(nvals == 0)
- return true;
- i = bb->consumed_blurbs;
- /*
- * We unroll the main loop to take care of partially consumed blurbs here.
- */
- if(bb->consumed_bits > 0) {
- save_blurb = blurb = buffer[i];
- cbits = bb->consumed_bits;
- blurb <<= cbits;
- while(1) {
- if(state == 0) {
- if(blurb) {
- for(j = 0; !(blurb & FLAC__BLURB_TOP_BIT_ONE); j++)
- blurb <<= 1;
- msbs += j;
- /* dispose of the unary end bit */
- blurb <<= 1;
- j++;
- cbits += j;
- uval = 0;
- lsbs_left = parameter;
- state++;
- if(cbits == FLAC__BITS_PER_BLURB) {
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- break;
- }
- }
- else {
- msbs += FLAC__BITS_PER_BLURB - cbits;
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- break;
- }
- }
- else {
- const unsigned available_bits = FLAC__BITS_PER_BLURB - cbits;
- if(lsbs_left >= available_bits) {
- uval <<= available_bits;
- uval |= (blurb >> cbits);
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- if(lsbs_left == available_bits) {
- /* compose the value */
- uval |= (msbs << parameter);
- if(uval & 1)
- vals[val_i++] = -((int)(uval >> 1)) - 1;
- else
- vals[val_i++] = (int)(uval >> 1);
- if(val_i == nvals)
- break;
- msbs = 0;
- state = 0;
- }
- lsbs_left -= available_bits;
- break;
- }
- else {
- uval <<= lsbs_left;
- uval |= (blurb >> (FLAC__BITS_PER_BLURB - lsbs_left));
- blurb <<= lsbs_left;
- cbits += lsbs_left;
- /* compose the value */
- uval |= (msbs << parameter);
- if(uval & 1)
- vals[val_i++] = -((int)(uval >> 1)) - 1;
- else
- vals[val_i++] = (int)(uval >> 1);
- if(val_i == nvals) {
- /* back up one if we exited the for loop because we read all nvals but the end came in the middle of a blurb */
- i--;
- break;
- }
- msbs = 0;
- state = 0;
- }
- }
- }
- i++;
- bb->consumed_blurbs = i;
- bb->consumed_bits = cbits;
- bb->total_consumed_bits = (i << FLAC__BITS_PER_BLURB_LOG2) | cbits;
- }
- /*
- * Now that we are blurb-aligned the logic is slightly simpler
- */
- while(val_i < nvals) {
- for( ; i < bb->blurbs && val_i < nvals; i++) {
- save_blurb = blurb = buffer[i];
- cbits = 0;
- while(1) {
- if(state == 0) {
- if(blurb) {
- for(j = 0; !(blurb & FLAC__BLURB_TOP_BIT_ONE); j++)
- blurb <<= 1;
- msbs += j;
- /* dispose of the unary end bit */
- blurb <<= 1;
- j++;
- cbits += j;
- uval = 0;
- lsbs_left = parameter;
- state++;
- if(cbits == FLAC__BITS_PER_BLURB) {
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- break;
- }
- }
- else {
- msbs += FLAC__BITS_PER_BLURB - cbits;
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- break;
- }
- }
- else {
- const unsigned available_bits = FLAC__BITS_PER_BLURB - cbits;
- if(lsbs_left >= available_bits) {
- uval <<= available_bits;
- uval |= (blurb >> cbits);
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- if(lsbs_left == available_bits) {
- /* compose the value */
- uval |= (msbs << parameter);
- if(uval & 1)
- vals[val_i++] = -((int)(uval >> 1)) - 1;
- else
- vals[val_i++] = (int)(uval >> 1);
- if(val_i == nvals)
- break;
- msbs = 0;
- state = 0;
- }
- lsbs_left -= available_bits;
- break;
- }
- else {
- uval <<= lsbs_left;
- uval |= (blurb >> (FLAC__BITS_PER_BLURB - lsbs_left));
- blurb <<= lsbs_left;
- cbits += lsbs_left;
- /* compose the value */
- uval |= (msbs << parameter);
- if(uval & 1)
- vals[val_i++] = -((int)(uval >> 1)) - 1;
- else
- vals[val_i++] = (int)(uval >> 1);
- if(val_i == nvals) {
- /* back up one if we exited the for loop because we read all nvals but the end came in the middle of a blurb */
- i--;
- break;
- }
- msbs = 0;
- state = 0;
- }
- }
- }
- }
- bb->consumed_blurbs = i;
- bb->consumed_bits = cbits;
- bb->total_consumed_bits = (i << FLAC__BITS_PER_BLURB_LOG2) | cbits;
- if(val_i < nvals) {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- /* these must be zero because we can only get here if we got to the end of the buffer */
- FLAC__ASSERT(bb->consumed_blurbs == 0);
- FLAC__ASSERT(bb->consumed_bits == 0);
- i = 0;
- }
- }
- return true;
- }
- #else
- {
- const FLAC__blurb *buffer = bb->buffer;
- unsigned i, j, val_i = nvals;
- unsigned cbits = 0, uval = 0, msbs = 0, lsbs_left = 0;
- FLAC__blurb blurb, save_blurb;
- unsigned state = 0; /* 0 = getting unary MSBs, 1 = getting binary LSBs */
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- FLAC__ASSERT(parameter <= 31);
- if(nvals == 0)
- return true;
- cbits = bb->consumed_bits;
- i = bb->consumed_blurbs;
- while(val_i != 0) {
- for( ; i < bb->blurbs; i++) {
- blurb = (save_blurb = buffer[i]) << cbits;
- while(1) {
- if(state == 0) {
- if(blurb) {
- j = FLAC__ALIGNED_BLURB_UNARY(blurb);
- msbs += j;
- j++;
- cbits += j;
- uval = 0;
- lsbs_left = parameter;
- state++;
- if(cbits == FLAC__BITS_PER_BLURB) {
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- break;
- }
- blurb <<= j;
- }
- else {
- msbs += FLAC__BITS_PER_BLURB - cbits;
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- break;
- }
- }
- else {
- const unsigned available_bits = FLAC__BITS_PER_BLURB - cbits;
- if(lsbs_left >= available_bits) {
- uval <<= available_bits;
- uval |= (blurb >> cbits);
- cbits = 0;
- CRC16_UPDATE_BLURB(bb, save_blurb, bb->read_crc16);
- if(lsbs_left == available_bits) {
- /* compose the value */
- uval |= (msbs << parameter);
- *vals = (int)(uval >> 1 ^ -(int)(uval & 1));
- --val_i;
- if(val_i == 0) {
- i++;
- goto break2;
- }
- ++vals;
- msbs = 0;
- state = 0;
- }
- lsbs_left -= available_bits;
- break;
- }
- else {
- cbits += lsbs_left;
- uval <<= lsbs_left;
- uval |= (blurb >> (FLAC__BITS_PER_BLURB - lsbs_left));
- blurb <<= lsbs_left;
- /* compose the value */
- uval |= (msbs << parameter);
- *vals = (int)(uval >> 1 ^ -(int)(uval & 1));
- --val_i;
- if(val_i == 0)
- goto break2;
- ++vals;
- msbs = 0;
- state = 0;
- }
- }
- }
- }
- break2:
- bb->consumed_blurbs = i;
- bb->consumed_bits = cbits;
- bb->total_consumed_bits = (i << FLAC__BITS_PER_BLURB_LOG2) | cbits;
- if(val_i != 0) {
- if(!bitbuffer_read_from_client_(bb, read_callback, client_data))
- return false;
- /* these must be zero because we can only get here if we got to the end of the buffer */
- FLAC__ASSERT(bb->consumed_blurbs == 0);
- FLAC__ASSERT(bb->consumed_bits == 0);
- i = 0;
- }
- }
- return true;
- }
- #endif
- #if 0 /* UNUSED */
- FLAC__bool FLAC__bitbuffer_read_golomb_signed(FLAC__BitBuffer *bb, int *val, unsigned parameter, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- FLAC__uint32 lsbs = 0, msbs = 0;
- unsigned bit, uval, k;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- k = FLAC__bitmath_ilog2(parameter);
- /* read the unary MSBs and end bit */
- if(!FLAC__bitbuffer_read_unary_unsigned(bb, &msbs, read_callback, client_data))
- return false;
- /* read the binary LSBs */
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &lsbs, k, read_callback, client_data))
- return false;
- if(parameter == 1u<<k) {
- /* compose the value */
- uval = (msbs << k) | lsbs;
- }
- else {
- unsigned d = (1 << (k+1)) - parameter;
- if(lsbs >= d) {
- if(!FLAC__bitbuffer_read_bit(bb, &bit, read_callback, client_data))
- return false;
- lsbs <<= 1;
- lsbs |= bit;
- lsbs -= d;
- }
- /* compose the value */
- uval = msbs * parameter + lsbs;
- }
- /* unfold unsigned to signed */
- if(uval & 1)
- *val = -((int)(uval >> 1)) - 1;
- else
- *val = (int)(uval >> 1);
- return true;
- }
- FLAC__bool FLAC__bitbuffer_read_golomb_unsigned(FLAC__BitBuffer *bb, unsigned *val, unsigned parameter, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
- {
- FLAC__uint32 lsbs, msbs = 0;
- unsigned bit, k;
- FLAC__ASSERT(0 != bb);
- FLAC__ASSERT(0 != bb->buffer);
- k = FLAC__bitmath_ilog2(parameter);
- /* read the unary MSBs and end bit */
- if(!FLAC__bitbuffer_read_unary_unsigned(bb, &msbs, read_callback, client_data))
- return false;
- /* read the binary LSBs */
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &lsbs, k, read_callback, client_data))
- return false;
- if(parameter == 1u<<k) {
- /* compose the value */
- *val = (msbs << k) | lsbs;
- }
- else {
- unsigned d = (1 << (k+1)) - parameter;
- if(lsbs >= d) {
- if(!FLAC__bitbuffer_read_bit(bb, &bit, read_callback, client_data))
- return false;
- lsbs <<= 1;
- lsbs |= bit;
- lsbs -= d;
- }
- /* compose the value */
- *val = msbs * parameter + lsbs;
- }
- return true;
- }
- #endif /* UNUSED */
- /* on return, if *val == 0xffffffff then the utf-8 sequence was invalid, but the return value will be true */
- FLAC__bool FLAC__bitbuffer_read_utf8_uint32(FLAC__BitBuffer *bb, FLAC__uint32 *val, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data, FLAC__byte *raw, unsigned *rawlen)
- {
- FLAC__uint32 v = 0;
- FLAC__uint32 x;
- unsigned i;
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x, 8, read_callback, client_data))
- return false;
- if(raw)
- raw[(*rawlen)++] = (FLAC__byte)x;
- if(!(x & 0x80)) { /* 0xxxxxxx */
- v = x;
- i = 0;
- }
- else if(x & 0xC0 && !(x & 0x20)) { /* 110xxxxx */
- v = x & 0x1F;
- i = 1;
- }
- else if(x & 0xE0 && !(x & 0x10)) { /* 1110xxxx */
- v = x & 0x0F;
- i = 2;
- }
- else if(x & 0xF0 && !(x & 0x08)) { /* 11110xxx */
- v = x & 0x07;
- i = 3;
- }
- else if(x & 0xF8 && !(x & 0x04)) { /* 111110xx */
- v = x & 0x03;
- i = 4;
- }
- else if(x & 0xFC && !(x & 0x02)) { /* 1111110x */
- v = x & 0x01;
- i = 5;
- }
- else {
- *val = 0xffffffff;
- return true;
- }
- for( ; i; i--) {
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x, 8, read_callback, client_data))
- return false;
- if(raw)
- raw[(*rawlen)++] = (FLAC__byte)x;
- if(!(x & 0x80) || (x & 0x40)) { /* 10xxxxxx */
- *val = 0xffffffff;
- return true;
- }
- v <<= 6;
- v |= (x & 0x3F);
- }
- *val = v;
- return true;
- }
- /* on return, if *val == 0xffffffffffffffff then the utf-8 sequence was invalid, but the return value will be true */
- FLAC__bool FLAC__bitbuffer_read_utf8_uint64(FLAC__BitBuffer *bb, FLAC__uint64 *val, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data, FLAC__byte *raw, unsigned *rawlen)
- {
- FLAC__uint64 v = 0;
- FLAC__uint32 x;
- unsigned i;
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x, 8, read_callback, client_data))
- return false;
- if(raw)
- raw[(*rawlen)++] = (FLAC__byte)x;
- if(!(x & 0x80)) { /* 0xxxxxxx */
- v = x;
- i = 0;
- }
- else if(x & 0xC0 && !(x & 0x20)) { /* 110xxxxx */
- v = x & 0x1F;
- i = 1;
- }
- else if(x & 0xE0 && !(x & 0x10)) { /* 1110xxxx */
- v = x & 0x0F;
- i = 2;
- }
- else if(x & 0xF0 && !(x & 0x08)) { /* 11110xxx */
- v = x & 0x07;
- i = 3;
- }
- else if(x & 0xF8 && !(x & 0x04)) { /* 111110xx */
- v = x & 0x03;
- i = 4;
- }
- else if(x & 0xFC && !(x & 0x02)) { /* 1111110x */
- v = x & 0x01;
- i = 5;
- }
- else if(x & 0xFE && !(x & 0x01)) { /* 11111110 */
- v = 0;
- i = 6;
- }
- else {
- *val = FLAC__U64L(0xffffffffffffffff);
- return true;
- }
- for( ; i; i--) {
- if(!FLAC__bitbuffer_read_raw_uint32(bb, &x, 8, read_callback, client_data))
- return false;
- if(raw)
- raw[(*rawlen)++] = (FLAC__byte)x;
- if(!(x & 0x80) || (x & 0x40)) { /* 10xxxxxx */
- *val = FLAC__U64L(0xffffffffffffffff);
- return true;
- }
- v <<= 6;
- v |= (x & 0x3F);
- }
- *val = v;
- return true;
- }
- /*
- void FLAC__bitbuffer_dump(const FLAC__BitBuffer *bb, FILE *out)
- {
- unsigned i, j;
- if(bb == 0) {
- fprintf(out, "bitbuffer is NULLn");
- }
- else {
- fprintf(out, "bitbuffer: capacity=%u blurbs=%u bits=%u total_bits=%u consumed: blurbs=%u, bits=%u, total_bits=%un", bb->capacity, bb->blurbs, bb->bits, bb->total_bits, bb->consumed_blurbs, bb->consumed_bits, bb->total_consumed_bits);
- for(i = 0; i < bb->blurbs; i++) {
- fprintf(out, "%08X: ", i);
- for(j = 0; j < FLAC__BITS_PER_BLURB; j++)
- if(i*FLAC__BITS_PER_BLURB+j < bb->total_consumed_bits)
- fprintf(out, ".");
- else
- fprintf(out, "%01u", bb->buffer[i] & (1 << (FLAC__BITS_PER_BLURB-j-1)) ? 1:0);
- fprintf(out, "n");
- }
- if(bb->bits > 0) {
- fprintf(out, "%08X: ", i);
- for(j = 0; j < bb->bits; j++)
- if(i*FLAC__BITS_PER_BLURB+j < bb->total_consumed_bits)
- fprintf(out, ".");
- else
- fprintf(out, "%01u", bb->buffer[i] & (1 << (bb->bits-j-1)) ? 1:0);
- fprintf(out, "n");
- }
- }
- }
- */