Commit 16cf47e3 authored by Josh Coalson's avatar Josh Coalson
Browse files

add FLAC__bitbuffer_skip_bits_no_crc()

parent 8e9c4519
......@@ -1306,6 +1306,42 @@ FLAC__bool FLAC__bitbuffer_peek_bit(FLAC__BitBuffer *bb, unsigned *val, FLAC__bo
}
}
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_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:
......@@ -1847,7 +1883,7 @@ FLaC__INLINE FLAC__bool FLAC__bitbuffer_read_raw_uint32_little_endian(FLAC__BitB
return true;
}
FLAC__bool FLAC__bitbuffer_read_byte_block_aligned(FLAC__BitBuffer *bb, FLAC__byte *val, unsigned nvals, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data)
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);
......
......@@ -118,6 +118,7 @@ FLAC__bool FLAC__bitbuffer_zero_pad_to_byte_boundary(FLAC__BitBuffer *bb);
* read functions
*/
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);
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); /* WATCHOUT: does not CRC the skipped data! */ /*@@@@ add to unit tests */
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);
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);
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);
......@@ -128,7 +129,7 @@ FLAC__bool FLAC__bitbuffer_read_raw_uint64(FLAC__BitBuffer *bb, FLAC__uint64 *va
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);
#endif
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); /*only for bits=32*/
FLAC__bool FLAC__bitbuffer_read_byte_block_aligned(FLAC__BitBuffer *bb, FLAC__byte *val, unsigned nvals, FLAC__bool (*read_callback)(FLAC__byte buffer[], unsigned *bytes, void *client_data), void *client_data); /* val may be 0 to skip bytes instead of reading them */
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); /* val may be 0 to skip bytes instead of reading them */ /*@@@@ WATCHOUT: does not CRC the read data! */
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__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);
......
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