Chiebot-Mirror/zlib - zlib - Gitea: Git with a cup of tea

Commit Graph

Author	SHA1	Message	Date
Mark Adler	41d86c73b2	Add crc32_combine_gen() and crc32_combine_op() for fast combines. When the same len2 is used repeatedly, it is faster to use crc32_combine_gen() to generate an operator, that is then used to combine CRCs with crc32_combine_op().	6 years ago
Mark Adler	47cb412957	Add tables for crc32_combine(), to speed it up by a factor of 200.	6 years ago
Mark Adler	3c46f5ddb5	Avoid the use of ptrdiff_t. This isn't the right type anyway to assure that it contains a pointer. That type would be intptr_t or uintptr_t. However the C99 standard says that those types are optional, so their use would not be portable. This commit simply uses size_t or whatever configure decided to use for size_t. That would be the same length as ptrdiff_t, and so will work just as well. The code checks to see if the length of the type used is the same as the length of a void pointer, so there is already protection against the use of the wrong type. The use of size_t (or ptrdiff_t) will almost always work, as all modern architectures have an array size that is the same as the pointer size. Only old segmented architectures would have to fall back to the slower CRC-32 calculation, where the amount of memory that can be accessed is larger than the maximum array size.	8 years ago
Mark Adler	2fa463bacf	zlib 1.2.9	8 years ago
Mark Adler	b9ae6f0079	Add crc32_z() and adler32_z() functions with size_t lengths.	8 years ago
Mark Adler	bedea2483b	Clean up and comment the use of local for static.	8 years ago
Mark Adler	e08118c401	Note the violation of the strict aliasing rule in crc32.c. See the comment for more details. This is in response to an issue raised as a result of a security audit of the zlib code by Trail of Bits and TrustInSoft, in support of the Mozilla Foundation.	8 years ago
Mark Adler	d1d577490c	Avoid pre-decrement of pointer in big-endian CRC calculation. There was a small optimization for PowerPCs to pre-increment a pointer when accessing a word, instead of post-incrementing. This required prefacing the loop with a decrement of the pointer, possibly pointing before the object passed. This is not compliant with the C standard, for which decrementing a pointer before its allocated memory is undefined. When tested on a modern PowerPC with a modern compiler, the optimization no longer has any effect. Due to all that, and per the recommendation of a security audit of the zlib code by Trail of Bits and TrustInSoft, in support of the Mozilla Foundation, this "optimization" was removed, in order to avoid the possibility of undefined behavior.	8 years ago
Mark Adler	6c9bd474aa	Fix type mismatch between get_crc_table() and crc_table. crc_table is made using a four-byte integer (when that can be determined). However get_crc_table() returned a pointer to an unsigned long, which could be eight bytes. This fixes that by creating a new z_crc_t type for the crc_table. This type is also used for the BYFOUR crc calculations that depend on a four-byte type. The four-byte type can now be determined by ./configure, which also solves a problem where ./configure --solo would never use BYFOUR. No the Z_U4 #define indicates that four- byte integer was found either by ./configure or by zconf.h.	13 years ago
Mark Adler	94acb3c1a0	zlib 1.2.6.1	13 years ago
Mark Adler	7d45cf5a1d	Use optimized byte swap operations for Microsoft and GNU [Snyder].	13 years ago
Mark Adler	f9e4edc996	Avoid library header include in crc32.c for Z_SOLO. crc32.c was #including limits.h in order to find a four-byte integer type. It was doing this even if Z_SOLO were defined, violating the intent of Z_SOLO, which is to include no library headers and require no library functions. Now crc32.c obeys the intent of Z_SOLO, but with the downside that crc32() will be slower than when not compiled with Z_SOLO. This can be remedied manually by typedefing u4 to a known four-byte unsigned integer type, and #defining BYFOUR in crc32.c.	13 years ago
Mark Adler	10daf0d4d7	zlib 1.2.5.1	14 years ago
Mark Adler	9712272c78	zlib 1.2.5	14 years ago
Mark Adler	05d47d2627	zlib 1.2.4.1	14 years ago
Mark Adler	f6194ef39a	zlib 1.2.3.4	14 years ago
Mark Adler	639be99788	zlib 1.2.3.3	14 years ago
Mark Adler	9c3a583021	zlib 1.2.2.4	14 years ago
Mark Adler	6b8233bfe0	zlib 1.2.2.3	14 years ago
Mark Adler	0484693e17	zlib 1.2.2.2	14 years ago
Mark Adler	9811b53dd9	zlib 1.2.2.1	14 years ago
Mark Adler	79fbcdc939	zlib 1.2.2	14 years ago
Mark Adler	7a6955760b	zlib 1.2.1.2	14 years ago
Mark Adler	4b5a43a219	zlib 1.2.0.5	14 years ago
Mark Adler	086e982175	zlib 1.2.0.4	14 years ago
Mark Adler	8e34b3a802	zlib 1.2.0.2	14 years ago
Mark Adler	7c2a874e50	zlib 1.2.0	14 years ago
Mark Adler	a383133c4e	zlib 1.1.4	14 years ago
Mark Adler	b8c9ecb076	zlib 1.0.9	14 years ago
Mark Adler	6759211ad8	zlib 1.0.8	14 years ago
Mark Adler	7850e4e406	zlib 1.0.7	14 years ago
Mark Adler	423eb40306	zlib 1.0.1	14 years ago
Mark Adler	8a2acbffc8	zlib 1.0-pre	14 years ago
Mark Adler	56bcb184fa	zlib 0.99	14 years ago
Mark Adler	23c69f1069	zlib 0.94	14 years ago
Mark Adler	6b834a58bd	zlib 0.93	14 years ago
Mark Adler	64b2e89203	zlib 0.9	14 years ago
Mark Adler	bcf78a2097	zlib 0.71	14 years ago

38 Commits (41d86c73b21191a3fa9ea5f476fc9f1fc5e4f8b3)