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* Avoid recursive gzgetc() macro call.Mark Adler2016-10-141-2/+2
| | | | | Recursive macro calls are normally caught by the preprocessor and avoided. This commit avoids the possibility of a problem entirely.
* Make globals in examples local to compilation unit.Mark Adler2016-10-142-4/+4
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* Add --warn option to ./configure, instead of environment variable.Mark Adler2016-10-111-1/+3
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* Clean up type conversions.Mark Adler2016-10-119-57/+62
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* Avoid casting an out-of-range value to long.Mark Adler2016-10-111-1/+1
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* Note the violation of the strict aliasing rule in crc32.c.Mark Adler2016-10-031-0/+12
| | | | | | 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.
* Avoid pre-decrement of pointer in big-endian CRC calculation.Mark Adler2016-09-281-3/+1
| | | | | | | | | | | | | | 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.
* Remove offset pointer optimization in inftrees.c.Mark Adler2016-09-211-10/+8
| | | | | | | | | | | inftrees.c was subtracting an offset from a pointer to an array, in order to provide a pointer that allowed indexing starting at the offset. This is not compliant with the C standard, for which the behavior of a pointer decremented before its allocated memory is undefined. Per the recommendation of a security audit of the zlib code by Trail of Bits and TrustInSoft, in support of the Mozilla Foundation, this tiny optimization was removed, in order to avoid the possibility of undefined behavior.
* Use post-increment only in inffast.c.Mark Adler2016-09-211-50/+31
| | | | | | | | | | An old inffast.c optimization turns out to not be optimal anymore with modern compilers, and furthermore was not compliant with the C standard, for which decrementing a pointer before its allocated memory is undefined. 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.
* Remove dummy structure declarations for old buggy compilers.Mark Adler2016-09-216-28/+0
| | | | | | | | | | | | | | While woolly mammoths still roamed the Earth and before Atlantis sunk into the ocean, there were C compilers that could not handle forward structure references, e.g. "struct name;". zlib dutifully provided a work-around for such compilers. That work-around is no longer needed, and, per the recommendation of a security audit of the zlib code by Trail of Bits and TrustInSoft, in support of the Mozilla Foundation, should be removed since what a compiler will do with this is technically undefined. From the report: "there is no telling what interactions the bug could have in the future with link-time optimizations and type-based alias analyses, both features that are present (but not default) in clang."
* Fix typo.Mark Adler2016-09-211-1/+1
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* Add option to not compute or check check values.Mark Adler2016-09-203-13/+34
| | | | | | | | | | | | | | | | | | The undocumented (except in these commit comments) function inflateValidate(strm, check) can be called after an inflateInit(), inflateInit2(), or inflateReset2() with check equal to zero to turn off the check value (CRC-32 or Adler-32) computation and comparison. Calling with check not equal to zero turns checking back on. This should only be called immediately after the init or reset function. inflateReset() does not change the state, so a previous inflateValidate() setting will remain in effect. This also turns off validation of the gzip header CRC when present. This should only be used when a zlib or gzip stream has already been checked, and repeated decompressions of the same stream no longer need to be validated.
* Correct the size of the inflate state in the comments.Mark Adler2016-09-201-1/+2
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* Fix typo in blast.c.Mark Adler2016-07-101-1/+1
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* Add configure.log to .gitignore.Mark Adler2016-06-171-0/+1
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* Loop on write() calls in gzwrite.c in case of non-blocking I/O.Mark Adler2016-04-051-11/+16
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* Fix gzseek() problem on MinGW due to buggy _lseeki64 there.Mark Adler2016-01-291-1/+1
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* Fix bug that accepted invalid zlib header when windowBits is zero.Mark Adler2015-11-261-1/+1
| | | | | | | | When windowBits is zero, the size of the sliding window comes from the zlib header. The allowed values of the four-bit field are 0..7, but when windowBits is zero, values greater than 7 are permitted and acted upon, resulting in large, mostly unused memory allocations. This fix rejects such invalid zlib headers.
* Use a consistent and more modern approach to not use a parameter.Mark Adler2015-10-041-6/+10
| | | | | | A remarkably creative and diverse set of approaches to letting the compiler know that opaque was being used when it wasn't is changed by this commit to the more standard (void)opaque.
* Use UTF-8 for non-ASCII characters in ChangeLog.Mark Adler2015-09-161-3/+3
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* Clean up portability for shifts and integer sizes.Mark Adler2015-09-053-4/+4
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* Avoid shifts of negative values inflateMark().Mark Adler2015-09-051-2/+3
| | | | | | The C standard says that bit shifts of negative integers is undefined. This casts to unsigned values to assure a known result.
* Fix typo.Mark Adler2015-08-151-1/+1
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* Use const for static tree descriptions in deflate.Mark Adler2015-08-152-4/+4
| | | | This is in order to permit shared memory for these structures.
* Allow building zlib outside of the source directory.Mark Adler2015-08-022-61/+197
| | | | | | | | | | To build, simply run configure from the source directory by specifying its path. That path will be used to find the source files. The source directory will not be touched. All new and modified files will be made in the current directory. Discovered in the process that not all makes understand % or $<, and not all compilers understand -include or -I-. This required a larger Makefile.in with explicit dependencies.
* Do not initialize unsigned with -1 in compress.c uncompr.c.Mark Adler2015-08-022-2/+2
| | | | Sun compiler complained. Use (unsigned)0 - 1 instead.
* Align deflateParams() and its documentation in zlib.h.Mark Adler2015-08-022-14/+27
| | | | | | | | This updates the documentation to reflect the behavior of deflateParams() when it is not able to compress all of the input data provided so far due to insufficient output space. It also assures that data provided is compressed before the parameter changes, even if at the beginning of the stream.
* Compile the gzopen_w() function when __CYGWIN__ defined.Mark Adler2015-08-013-5/+9
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* Define _POSIX_SOURCE to enable POSIX extensions on some systems.Mark Adler2015-07-281-0/+4
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* Clarify deflateReset() documentation.Mark Adler2015-07-281-4/+4
| | | | | | It previously could have been misinterpreted to mean that parameter changes after deflateInit2() would be reversed, which is not the case.
* Avoid uninitialized access by gzclose_w().Mark Adler2015-07-282-1/+2
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* Avoid use of DEBUG macro -- change to ZLIB_DEBUG.Mark Adler2015-07-2814-33/+33
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* Avoid use of reallocf() in test/infcover.c.Mark Adler2015-07-281-8/+8
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* Fix inflateInit2() bug when windowBits is 16 or 32.Mark Adler2015-07-281-0/+2
| | | | | | | | A windowBits value of 0, 16, or 32 gets the window bits from the zlib header. However there is no zlib header for 16, or for 32 when the input is gzip. This commit sets the window bits for inflate to 15 if a gzip stream is detected and windowBits was 16 or 32.
* Add comment about not using windowBits of 8 for deflate().Mark Adler2015-07-281-0/+8
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* Put license in zlib.3 man page.Mark Adler2015-07-072-9/+27
| | | | | Previously there was a confusing reference to a "distribution directory".
* Improve speed of gzprintf() in transparent mode.Mark Adler2015-07-054-51/+70
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* Avoid left shift of a negative value in flush rank calculation.Mark Adler2015-07-051-1/+1
| | | | | The C standard permits an undefined result for a left shift of a negative value.
* Remedy Coverity warning. [Randers-Pehrson]Mark Adler2015-01-261-1/+1
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* Add inflateCodesUsed() function for internal use.Mark Adler2014-12-291-0/+9
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* Fix bug in test/example.c where error code not saved.Mark Adler2014-07-021-1/+1
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* Note in zlib.h that compress() uses Z_DEFAULT_COMPRESSION.Mark Adler2014-04-261-1/+2
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* Fix uncompress() to work on lengths more than a maximum unsigned.Mark Adler2014-04-261-20/+41
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* Fix compress() to work on lengths more than a maximum unsigned.Mark Adler2014-04-261-18/+24
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* Assure that gzoffset() is correct when appending.Mark Adler2014-04-241-1/+3
| | | | | | | An open() with O_APPEND followed by an lseek() to determine the position will return zero for a non-empty file, even though the next write will start at the end of the file. This commit works around that by doing an lseek() to the end when appending.
* Improve contrib/blast to return unused bytes. Fix the test codeMark Adler2013-08-242-15/+43
| | | | | to report the count of unused bytes at the end correctly. Add the ability to provide initial input to blast().
* Fix contrib/minizip to permit unzipping with desktop API [Zouzou].Mark Adler2013-08-031-3/+4
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* Spacing cleanup.Mark Adler2013-05-231-1/+1
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* Change version number to 1.2.8.1.Mark Adler2013-05-0227-48/+51
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* zlib 1.2.8v1.2.8Mark Adler2013-04-284-5/+9
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