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Added option '--crp-lzma-fb='. Started tuning lzma compression

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levels '-1' and '-2'.
This commit is contained in:
Markus F.X.J. Oberhumer
2006-10-12 14:23:22 +02:00
parent e1379ac5ce
commit b31b8cd7f0
5 changed files with 26 additions and 5 deletions
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src/compress_lzma.cpp
+9 -1
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@@ -193,7 +193,7 @@ int upx_lzma_compress ( const upx_bytep src, unsigned src_len,
pr[2].uintVal = 3; // 0..8
pr[3].uintVal = 1024 * 1024;
pr[4].uintVal = 2;
pr[5].uintVal = 64; // 5..
pr[5].uintVal = 64; // 5..273
pr[6].uintVal = 0;
#if 0
// DEBUG - set sizes so that we use a maxmimum amount of stack.
@@ -209,8 +209,11 @@ int upx_lzma_compress ( const upx_bytep src, unsigned src_len,
case 1:
pr[3].uintVal = 256 * 1024;
pr[4].uintVal = 0;
pr[5].uintVal = 8;
break;
case 2:
pr[3].uintVal = 256 * 1024;
pr[4].uintVal = 0;
break;
case 3:
break;
@@ -243,6 +246,8 @@ int upx_lzma_compress ( const upx_bytep src, unsigned src_len,
pr[1].uintVal = cconf_parm->conf_lzma.lit_pos_bits;
if (cconf_parm->conf_lzma.lit_context_bits.is_set)
pr[2].uintVal = cconf_parm->conf_lzma.lit_context_bits;
if (cconf_parm->conf_lzma.num_fast_bytes.is_set)
pr[5].uintVal = cconf_parm->conf_lzma.num_fast_bytes;
}
// limit dictionary size
@@ -276,6 +281,9 @@ int upx_lzma_compress ( const upx_bytep src, unsigned src_len,
res->lit_pos_bits = pr[1].uintVal;
res->lit_context_bits = pr[2].uintVal;
res->dict_size = pr[3].uintVal;
res->fast_mode = pr[4].uintVal;
res->num_fast_bytes = pr[5].uintVal;
res->match_finder_cycles = pr[6].uintVal;
//res->num_probs = LzmaGetNumProbs(&s.Properties));
//res->num_probs = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << ((Properties)->lc + (Properties)->lp)))
res->num_probs = 1846 + (768 << (res->lit_context_bits + res->lit_pos_bits));