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bitwrite.c: Tweaks

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* Removes unused FLAC__WORD_ALL_ONES definition.
* Add comment that unused bits of accumulator can contain garbage.
* Turn assert inside FLAC__bitwriter_write_utf8_uint32 into runtime
  check (similar to FLAC__bitwriter_write_utf8_uint64() function).

Patch-from: lvqcl <lvqcl.mail@gmail.com>
This commit is contained in:
Erik de Castro Lopo
2016-05-01 20:40:24 +10:00
parent 94386fdea5
commit f3a16f85cf
1 changed files with 4 additions and 5 deletions
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9
src/libFLAC/bitwriter.c
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@@ -53,7 +53,6 @@
typedef FLAC__uint32 bwword;
#define FLAC__BYTES_PER_WORD 4 /* sizeof bwword */
#define FLAC__BITS_PER_WORD 32
#define FLAC__WORD_ALL_ONES ((FLAC__uint32)0xffffffff)
/* SWAP_BE_WORD_TO_HOST swaps bytes in a bwword (which is always big-endian) if necessary to match host byte order */
#if WORDS_BIGENDIAN
#define SWAP_BE_WORD_TO_HOST(x) (x)
@@ -66,7 +65,6 @@ typedef FLAC__uint32 bwword;
typedef FLAC__uint64 bwword;
#define FLAC__BYTES_PER_WORD 8 /* sizeof bwword */
#define FLAC__BITS_PER_WORD 64
#define FLAC__WORD_ALL_ONES ((FLAC__uint64)FLAC__U64L(0xffffffffffffffff))
/* SWAP_BE_WORD_TO_HOST swaps bytes in a bwword (which is always big-endian) if necessary to match host byte order */
#if WORDS_BIGENDIAN
#define SWAP_BE_WORD_TO_HOST(x) (x)
@@ -353,7 +351,7 @@ static inline FLAC__bool FLAC__bitwriter_write_raw_uint32_nocheck(FLAC__BitWrite
bw->accum <<= left;
bw->accum |= val >> (bw->bits = bits - left);
bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum);
bw->accum = val;
bw->accum = val; /* unused top bits can contain garbage */
}
else { /* at this point bits == FLAC__BITS_PER_WORD == 32 and bw->bits == 0 */
bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST((bwword)val);
@@ -622,7 +620,7 @@ break1:
bw->accum <<= left;
bw->accum |= uval >> (bw->bits = lsbits - left);
bw->buffer[bw->words++] = SWAP_BE_WORD_TO_HOST(bw->accum);
bw->accum = uval;
bw->accum = uval; /* unused top bits can contain garbage */
}
}
vals++;
@@ -762,7 +760,8 @@ FLAC__bool FLAC__bitwriter_write_utf8_uint32(FLAC__BitWriter *bw, FLAC__uint32 v
FLAC__ASSERT(0 != bw);
FLAC__ASSERT(0 != bw->buffer);
FLAC__ASSERT(!(val & 0x80000000)); /* this version only handles 31 bits */
if((val & 0x80000000) != 0) /* this version only handles 31 bits */
return false;
if(val < 0x80) {
return FLAC__bitwriter_write_raw_uint32_nocheck(bw, val, 8);