ref: 985b2457cda207c2c65edeb647aedbb6e92dac46
dir: /sys/src/cmd/audio/libFLAC/bitbuffer.c/
/* libFLAC - Free Lossless Audio Codec library
* Copyright (C) 2000,2001,2002,2003,2004 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.
*
*/
/*
* 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 */
#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));
#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));
#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) {
unsigned l = 0, r = bb->consumed_blurbs, r_end = bb->blurbs + (bb->bits? 1:0);
for( ; r < r_end; l++, r++)
bb->buffer[l] = bb->buffer[r];
for( ; l < r_end; l++)
bb->buffer[l] = 0;
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(void)
{
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)
{
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;
}
#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 NULL\n");
}
else {
fprintf(out, "bitbuffer: capacity=%u blurbs=%u bits=%u total_bits=%u consumed: blurbs=%u, bits=%u, total_bits=%u\n", 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");
}
}
}