diff options
Diffstat (limited to 'src/liblzma/lzma/lzma_common.h')
| -rw-r--r-- | src/liblzma/lzma/lzma_common.h | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/src/liblzma/lzma/lzma_common.h b/src/liblzma/lzma/lzma_common.h index d46b8502..c3c587f0 100644 --- a/src/liblzma/lzma/lzma_common.h +++ b/src/liblzma/lzma/lzma_common.h @@ -125,31 +125,33 @@ typedef enum { /// /// Match byte is used when the previous LZMA symbol was something else than /// a literal (that is, it was some kind of match). -#define LITERAL_CODER_SIZE 0x300 +#define LITERAL_CODER_SIZE UINT32_C(0x300) /// Maximum number of literal coders #define LITERAL_CODERS_MAX (1 << LZMA_LCLP_MAX) +/// Calculates the literal_mask that literal_subcoder() needs. +#define literal_mask_calc(lc, lp) \ + ((UINT32_C(0x100) << (lp)) - (UINT32_C(0x100) >> (lc))) + /// Locate the literal coder for the next literal byte. The choice depends on /// - the lowest literal_pos_bits bits of the position of the current /// byte; and /// - the highest literal_context_bits bits of the previous byte. -#define literal_subcoder(probs, lc, lp_mask, pos, prev_byte) \ - ((probs)[(((pos) & (lp_mask)) << (lc)) \ - + ((uint32_t)(prev_byte) >> (8U - (lc)))]) +#define literal_subcoder(probs, lc, literal_mask, pos, prev_byte) \ + ((probs) + UINT32_C(3) * \ + (((((pos) << 8) + (prev_byte)) & (literal_mask)) << (lc))) static inline void -literal_init(probability (*probs)[LITERAL_CODER_SIZE], - uint32_t lc, uint32_t lp) +literal_init(probability *probs, uint32_t lc, uint32_t lp) { assert(lc + lp <= LZMA_LCLP_MAX); - const uint32_t coders = 1U << (lc + lp); + const size_t coders = LITERAL_CODER_SIZE << (lc + lp); - for (uint32_t i = 0; i < coders; ++i) - for (uint32_t j = 0; j < LITERAL_CODER_SIZE; ++j) - bit_reset(probs[i][j]); + for (size_t i = 0; i < coders; ++i) + bit_reset(probs[i]); return; } |