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2013-03-16archive-zip: use deflateInit2() to ask for raw compressed dataLibravatar René Scharfe1-6/+19
We use the function git_deflate_init() -- which wraps the zlib function deflateInit() -- to initialize compression of ZIP file entries. This results in compressed data prefixed with a two-bytes long header and followed by a four-bytes trailer. ZIP file entries consist of ZIP headers and raw compressed data instead, so we remove the zlib wrapper before writing the result. We can ask zlib for the the raw compressed data without the unwanted parts in the first place by using deflateInit2() and specifying a negative number of bits to size the window. For that purpose, factor out the function do_git_deflate_init() and add git_deflate_init_raw(), which wraps it. Then use the latter in archive-zip.c and get rid of the code that stripped the zlib header and trailer. Also rename the helper function zlib_deflate() to zlib_deflate_raw() to reflect the change. Thus we avoid generating data that we throw away anyway, the code becomes shorter and some magic constants are removed. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-12-01bulk-checkin: replace fast-import based implementationLibravatar Junio C Hamano1-1/+8
This extends the earlier approach to stream a large file directly from the filesystem to its own packfile, and allows "git add" to send large files directly into a single pack. Older code used to spawn fast-import, but the new bulk-checkin API replaces it. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-06-10zlib: allow feeding more than 4GB in one goLibravatar Junio C Hamano1-20/+58
Update zlib_post_call() that adjusts the wrapper's notion of avail_in and avail_out to what came back from zlib, so that the callers can feed buffers larger than than 4GB to the API. When underlying inflate/deflate stopped processing because we fed a buffer larger than 4GB limit, detect that case, update the state variables, and let the zlib function work another round. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-06-10zlib: zlib can only process 4GB at a timeLibravatar Junio C Hamano1-28/+91
The size of objects we read from the repository and data we try to put into the repository are represented in "unsigned long", so that on larger architectures we can handle objects that weigh more than 4GB. But the interface defined in zlib.h to communicate with inflate/deflate limits avail_in (how many bytes of input are we calling zlib with) and avail_out (how many bytes of output from zlib are we ready to accept) fields effectively to 4GB by defining their type to be uInt. In many places in our code, we allocate a large buffer (e.g. mmap'ing a large loose object file) and tell zlib its size by assigning the size to avail_in field of the stream, but that will truncate the high octets of the real size. The worst part of this story is that we often pass around z_stream (the state object used by zlib) to keep track of the number of used bytes in input/output buffer by inspecting these two fields, which practically limits our callchain to the same 4GB limit. Wrap z_stream in another structure git_zstream that can express avail_in and avail_out in unsigned long. For now, just die() when the caller gives a size that cannot be given to a single zlib call. In later patches in the series, we would make git_inflate() and git_deflate() internally loop to give callers an illusion that our "improved" version of zlib interface can operate on a buffer larger than 4GB in one go. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-06-10zlib: wrap deflateBound() tooLibravatar Junio C Hamano1-0/+9
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-06-10zlib: wrap deflate side of the APILibravatar Junio C Hamano1-0/+62
Wrap deflateInit, deflate, and deflateEnd for everybody, and the sole use of deflateInit2 in remote-curl.c to tell the library to use gzip header and trailer in git_deflate_init_gzip(). There is only one caller that cares about the status from deflateEnd(). Introduce git_deflate_end_gently() to let that sole caller retrieve the status and act on it (i.e. die) for now, but we would probably want to make inflate_end/deflate_end die when they ran out of memory and get rid of the _gently() kind. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-06-10zlib: wrap inflateInit2 used to accept only for gzip formatLibravatar Junio C Hamano1-0/+15
http-backend.c uses inflateInit2() to tell the library that it wants to accept only gzip format. Wrap it in a helper function so that readers do not have to wonder what the magic numbers 15 and 16 are for. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-06-10zlib wrapper: refactor error message formatterLibravatar Junio C Hamano1-35/+38
Before refactoring the main part of the wrappers, first move the logic to convert error status that come back from zlib to string to a helper function. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-11-10wrapper: give zlib wrappers their own translation unitLibravatar Jonathan Nieder1-0/+61
Programs using xmalloc() but not git_inflate() require -lz on the linker command line because git_inflate() is in the same translation unit as xmalloc(). Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>