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author | Treehugger Robot <treehugger-gerrit@google.com> | 2021-04-20 02:54:38 +0000 |
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committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | 2021-04-20 02:54:38 +0000 |
commit | 94af5fff583831d75c92b83f95a6d25a1888c3d1 (patch) | |
tree | 6a5fca95ce93294ff06b53dbdfd4e3a81548cea3 | |
parent | 9a8f19b42f572fb4b8133b1ab4ab016218aebd8f (diff) | |
parent | be81a990b3e1b1827602cf0fd23c5b55dce3a4de (diff) | |
download | bsdiff-94af5fff583831d75c92b83f95a6d25a1888c3d1.tar.gz |
Merge "Add comment explaining why we need custom logic to parse int" am: be81a990b3
Original change: https://android-review.googlesource.com/c/platform/external/bsdiff/+/1680665
Change-Id: Ie12b010d9c27b95ef7c4825887b55a969a6fee3b
-rw-r--r-- | utils.cc | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -7,6 +7,11 @@ namespace bsdiff { int64_t ParseInt64(const uint8_t* buf) { + // BSPatch uses a non-standard encoding of integers. + // Highest bit of that integer is used as a sign bit, 1 = negative + // and 0 = positive. + // Therefore, if the highest bit is set, flip it, then do 2's complement + // to get the integer in standard form int64_t result = buf[7] & 0x7F; for (int i = 6; i >= 0; i--) { result <<= 8; |