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Document the rejection of 256-byte window requests in zlib.h.

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Mark Adler
2016-10-24 16:00:51 -07:00
parent 049578f0a1
commit 77fd7e56bf
1 changed files with 4 additions and 0 deletions
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zlib.h
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@@ -563,6 +563,10 @@ ZEXTERN int ZEXPORT deflateInit2 OF((z_streamp strm,
header crc, and the operating system will be set to 255 (unknown). If a header crc, and the operating system will be set to 255 (unknown). If a
gzip stream is being written, strm->adler is a crc32 instead of an adler32. gzip stream is being written, strm->adler is a crc32 instead of an adler32.
For raw deflate or gzip encoding, a request for a 256-byte window is
rejected as invalid, since only the zlib header provides a means of
transmitting the window size to the decompressor.
The memLevel parameter specifies how much memory should be allocated The memLevel parameter specifies how much memory should be allocated
for the internal compression state. memLevel=1 uses minimum memory but is for the internal compression state. memLevel=1 uses minimum memory but is
slow and reduces compression ratio; memLevel=9 uses maximum memory for slow and reduces compression ratio; memLevel=9 uses maximum memory for