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Diffstat (limited to 'src/liblzma/lzma/lzma_decoder.c')
-rw-r--r--src/liblzma/lzma/lzma_decoder.c108
1 files changed, 25 insertions, 83 deletions
diff --git a/src/liblzma/lzma/lzma_decoder.c b/src/liblzma/lzma/lzma_decoder.c
index cf437d88..2e8393d6 100644
--- a/src/liblzma/lzma/lzma_decoder.c
+++ b/src/liblzma/lzma/lzma_decoder.c
@@ -25,21 +25,13 @@
#ifdef HAVE_SMALL
// Macros for (somewhat) size-optimized code.
-#define seq_4(seq) seq
-
-#define seq_6(seq) seq
-
-#define seq_8(seq) seq
-
-#define seq_len(seq) \
- seq ## _CHOICE, \
- seq ## _CHOICE2, \
- seq ## _BITTREE
-
+// This is used to decode the match length (how many bytes must be repeated
+// from the dictionary). This version is used in the Resumable mode and
+// does not unroll any loops.
#define len_decode(target, ld, pos_state, seq) \
do { \
case seq ## _CHOICE: \
- rc_if_0(ld.choice, seq ## _CHOICE) { \
+ rc_if_0_safe(ld.choice, seq ## _CHOICE) { \
rc_update_0(ld.choice); \
probs = ld.low[pos_state];\
limit = LEN_LOW_SYMBOLS; \
@@ -47,7 +39,7 @@ case seq ## _CHOICE: \
} else { \
rc_update_1(ld.choice); \
case seq ## _CHOICE2: \
- rc_if_0(ld.choice2, seq ## _CHOICE2) { \
+ rc_if_0_safe(ld.choice2, seq ## _CHOICE2) { \
rc_update_0(ld.choice2); \
probs = ld.mid[pos_state]; \
limit = LEN_MID_SYMBOLS; \
@@ -63,89 +55,42 @@ case seq ## _CHOICE2: \
symbol = 1; \
case seq ## _BITTREE: \
do { \
- rc_bit(probs[symbol], , , seq ## _BITTREE); \
+ rc_bit_safe(probs[symbol], , , seq ## _BITTREE); \
} while (symbol < limit); \
target += symbol - limit; \
} while (0)
-#else // HAVE_SMALL
-
-// Unrolled versions
-#define seq_4(seq) \
- seq ## 0, \
- seq ## 1, \
- seq ## 2, \
- seq ## 3
-
-#define seq_6(seq) \
- seq ## 0, \
- seq ## 1, \
- seq ## 2, \
- seq ## 3, \
- seq ## 4, \
- seq ## 5
-
-#define seq_8(seq) \
- seq ## 0, \
- seq ## 1, \
- seq ## 2, \
- seq ## 3, \
- seq ## 4, \
- seq ## 5, \
- seq ## 6, \
- seq ## 7
-
-#define seq_len(seq) \
- seq ## _CHOICE, \
- seq ## _LOW0, \
- seq ## _LOW1, \
- seq ## _LOW2, \
- seq ## _CHOICE2, \
- seq ## _MID0, \
- seq ## _MID1, \
- seq ## _MID2, \
- seq ## _HIGH0, \
- seq ## _HIGH1, \
- seq ## _HIGH2, \
- seq ## _HIGH3, \
- seq ## _HIGH4, \
- seq ## _HIGH5, \
- seq ## _HIGH6, \
- seq ## _HIGH7
-#define len_decode(target, ld, pos_state, seq) \
+// This is the faster version of the match length decoder that does not
+// worry about being resumable. It unrolls the bittree decoding loop.
+#define len_decode_fast(target, ld, pos_state) \
do { \
symbol = 1; \
-case seq ## _CHOICE: \
- rc_if_0(ld.choice, seq ## _CHOICE) { \
+ rc_if_0(ld.choice) { \
rc_update_0(ld.choice); \
- rc_bit_case(ld.low[pos_state][symbol], , , seq ## _LOW0); \
- rc_bit_case(ld.low[pos_state][symbol], , , seq ## _LOW1); \
- rc_bit_case(ld.low[pos_state][symbol], , , seq ## _LOW2); \
+ rc_bit(ld.low[pos_state][symbol], , ); \
+ rc_bit(ld.low[pos_state][symbol], , ); \
+ rc_bit(ld.low[pos_state][symbol], , ); \
target = symbol - LEN_LOW_SYMBOLS + MATCH_LEN_MIN; \
} else { \
rc_update_1(ld.choice); \
-case seq ## _CHOICE2: \
- rc_if_0(ld.choice2, seq ## _CHOICE2) { \
+ rc_if_0(ld.choice2) { \
rc_update_0(ld.choice2); \
- rc_bit_case(ld.mid[pos_state][symbol], , , \
- seq ## _MID0); \
- rc_bit_case(ld.mid[pos_state][symbol], , , \
- seq ## _MID1); \
- rc_bit_case(ld.mid[pos_state][symbol], , , \
- seq ## _MID2); \
+ rc_bit(ld.mid[pos_state][symbol], , ); \
+ rc_bit(ld.mid[pos_state][symbol], , ); \
+ rc_bit(ld.mid[pos_state][symbol], , ); \
target = symbol - LEN_MID_SYMBOLS \
+ MATCH_LEN_MIN + LEN_LOW_SYMBOLS; \
} else { \
rc_update_1(ld.choice2); \
- rc_bit_case(ld.high[symbol], , , seq ## _HIGH0); \
- rc_bit_case(ld.high[symbol], , , seq ## _HIGH1); \
- rc_bit_case(ld.high[symbol], , , seq ## _HIGH2); \
- rc_bit_case(ld.high[symbol], , , seq ## _HIGH3); \
- rc_bit_case(ld.high[symbol], , , seq ## _HIGH4); \
- rc_bit_case(ld.high[symbol], , , seq ## _HIGH5); \
- rc_bit_case(ld.high[symbol], , , seq ## _HIGH6); \
- rc_bit_case(ld.high[symbol], , , seq ## _HIGH7); \
+ rc_bit(ld.high[symbol], , ); \
+ rc_bit(ld.high[symbol], , ); \
+ rc_bit(ld.high[symbol], , ); \
+ rc_bit(ld.high[symbol], , ); \
+ rc_bit(ld.high[symbol], , ); \
+ rc_bit(ld.high[symbol], , ); \
+ rc_bit(ld.high[symbol], , ); \
+ rc_bit(ld.high[symbol], , ); \
target = symbol - LEN_HIGH_SYMBOLS \
+ MATCH_LEN_MIN \
+ LEN_LOW_SYMBOLS + LEN_MID_SYMBOLS; \
@@ -153,8 +98,6 @@ case seq ## _CHOICE2: \
} \
} while (0)
-#endif // HAVE_SMALL
-
/// Length decoder probabilities; see comments in lzma_common.h.
typedef struct {
@@ -889,7 +832,6 @@ out:
}
-
static void
lzma_decoder_uncompressed(void *coder_ptr, lzma_vli uncompressed_size,
bool allow_eopm)