mirrors/jgit - jgit - source @ dussan.org

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Shawn O. Pearce b24f907e3e Buffer very large delta streams to reduce explosion of CPU work Large delta streams are unpacked incrementally, but because a delta can seek to a random position in the base to perform a copy we may need to inflate the base repeatedly just to complete one delta. So work around it by copying the base to a temporary file, and then we can read from that temporary file using random seeks instead. Its far more efficient because we now only need to inflate the base once. This is still really ugly because we have to dump to a temporary file, but at least the code can successfully process a large file without throwing OutOfMemoryError. If speed is an issue, the user will need to increase the JVM heap and ensure core.streamFileThreshold is set to a higher value, so we don't use this code path as often. Unfortunately we lose the "optimization" of skipping over portions of a delta base that we don't actually need in the final result. This is going to cause us to inflate and write to disk useless regions that were deleted and do not appear in the final result. We could later improve on our code by trying to flatten delta instruction streams before we touch the bottom base object, and then only store the portions of the base we really need for the final result and that appear out-of-order. Since that is some pretty complex code I'm punting on it for now and just doing this simple whole-object buffering. Because the process umask might be permitting other users to read files we create, we put the temporary buffers into $GIT_DIR/objects. We can reasonably assume that if a reader can read our temporary buffer file in that directory, they can also read the base pack file we are pulling it from and therefore its not a security breach to expose the inflated content in a file. This requires a reader to have write access to the repository, but only if the file is really big. I'd rather err on the side of caution here and refuse to read a very big file into /tmp than to possibly expose a secured content because the Java 5 JVM won't let us create a protected temporary file that only the current user can access. Change-Id: I66fb80b08cbcaf0f65f2db0462c546a495a160dd Signed-off-by: Shawn O. Pearce <spearce@spearce.org>		13 yıl önce
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DisabledOutputStream.java	Externalize strings from JGit	14 yıl önce
EolCanonicalizingInputStream.java	Perform automatic CRLF to LF conversion during WorkingTreeIterator	13 yıl önce
InterruptTimer.java	Externalize strings from JGit	14 yıl önce
MessageWriter.java	Capture non-progress side band #2 messages and put in result	14 yıl önce
StreamCopyThread.java	Fix missing flush in StreamCopyThread	14 yıl önce
TeeInputStream.java	Buffer very large delta streams to reduce explosion of CPU work	13 yıl önce
TimeoutInputStream.java	Externalize strings from JGit	14 yıl önce
TimeoutOutputStream.java	Externalize strings from JGit	14 yıl önce
UnionInputStream.java	UnionInputStream: combines sequential InputStreams into one	14 yıl önce