Released January 15, 2017

Version 1.2.11 has these key improvements over 1.2.10:

• Fix deflate stored bug when pulling last block from window
• Permit immediate deflateParams changes before any deflate input
• Due to the bug fixes, any installations of 1.2.9 or 1.2.10 should be immediately replaced with 1.2.11.

Version 1.2.10 has these key improvements over 1.2.9:

• Fix bug in deflate_stored() for zero-length input
• Fix bug in gzwrite.c that produced corrupt gzip files

Version 1.2.9 has these key improvements over 1.2.8:

• Improve compress() and uncompress() to support large lengths
• Allow building zlib outside of the source directory
• Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
• Fix bugs in creating a very large gzip header
• Add uncompress2() function, which returns the input size used
• Dramatically speed up deflation for level 0 (storing)
• Add gzfread() and gzfwrite(), duplicating the interfaces of fread() and fwrite()
• Add crc32_z() and adler32_z() functions with size_t lengths
• Many portability improvements