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author | Mark Adler <madler@alumni.caltech.edu> | 2011-09-09 23:26:40 -0700 |
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committer | Mark Adler <madler@alumni.caltech.edu> | 2011-09-09 23:26:40 -0700 |
commit | f6194ef39af5864f792412460c354cc339dde7d1 (patch) | |
tree | 5ea1e6849128e9b2194c66ee3d82afa36b4ac07c /inftrees.h | |
parent | 639be997883d9016baaf46017a2802b2ce1698bd (diff) | |
download | zlib-f6194ef39af5864f792412460c354cc339dde7d1.tar.gz |
zlib 1.2.3.4v1.2.3.4
Diffstat (limited to 'inftrees.h')
-rw-r--r-- | inftrees.h | 23 |
1 files changed, 15 insertions, 8 deletions
@@ -35,15 +35,22 @@ typedef struct { 01000000 - invalid code */ -/* Maximum size of dynamic tree. The maximum found in a long but non- - exhaustive search was 1444 code structures (852 for length/literals - and 592 for distances, the latter actually the result of an - exhaustive search). The true maximum is not known, but the value - below is more than safe. */ -#define ENOUGH 2048 -#define MAXD 592 +/* Maximum size of the dynamic table. The maximum number of code structures is + 1444, which is the sum of 852 for literal/length codes and 592 for distance + codes. These values were found by exhaustive searches using the program + examples/enough.c found in the zlib distribtution. The arguments to that + program are the number of symbols, the initial root table size, and the + maximum bit length of a code. "enough 286 9 15" for literal/length codes + returns returns 852, and "enough 30 6 15" for distance codes returns 592. + The initial root table size (9 or 6) is found in the fifth argument of the + inflate_table() calls in inflate.c and infback.c. If the root table size is + changed, then these maximum sizes would be need to be recalculated and + updated. */ +#define ENOUGH_LENS 852 +#define ENOUGH_DISTS 592 +#define ENOUGH (ENOUGH_LENS+ENOUGH_DISTS) -/* Type of code to build for inftable() */ +/* Type of code to build for inflate_table() */ typedef enum { CODES, LENS, |