diff options
Diffstat (limited to 'src/lib/lzmadecode.c')
| -rw-r--r-- | src/lib/lzmadecode.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/lib/lzmadecode.c b/src/lib/lzmadecode.c index ada72260f2..fbf15964a6 100644 --- a/src/lib/lzmadecode.c +++ b/src/lib/lzmadecode.c @@ -29,9 +29,12 @@ #define kBitModelTotal (1 << kNumBitModelTotalBits) #define kNumMoveBits 5 -/* Use 32-bit reads whenever possible to avoid bad flash performance. */ +/* Use 32-bit reads whenever possible to avoid bad flash performance. Fall back + * to byte reads for last 4 bytes since RC_TEST returns an error when BufferLim + * is *reached* (not surpassed!), meaning we can't allow that to happen while + * there are still bytes to decode from the algorithm's point of view. */ #define RC_READ_BYTE (look_ahead_ptr < 4 ? look_ahead.raw[look_ahead_ptr++] \ - : ((((uintptr_t) Buffer & 3) || ((SizeT) (BufferLim - Buffer) < 4)) ? (*Buffer++) \ + : ((((uintptr_t) Buffer & 3) || ((SizeT) (BufferLim - Buffer) <= 4)) ? (*Buffer++) \ : ((look_ahead.dw = *(UInt32 *)Buffer), (Buffer += 4), (look_ahead_ptr = 1), look_ahead.raw[0]))) #define RC_INIT2 Code = 0; Range = 0xFFFFFFFF; \ |