Snap for 7298338 from 27b55c2640bf9bcff7fb17d4651d6a36f1645760 to sc-d1-releaseandroid-12.0.0_r7android-12.0.0_r6android-12.0.0_r5android-12.0.0_r4android-12.0.0_r15android-12.0.0_r14android-12.0.0_r13android-12.0.0_r12android12-d1-s6-releaseandroid12-d1-s5-releaseandroid12-d1-s4-releaseandroid12-d1-s3-releaseandroid12-d1-s2-releaseandroid12-d1-s1-releaseandroid12-d1-release

Change-Id: I957f1f211476be0798e8071d01957589b38bac9a

1 files changed, 5 insertions, 0 deletions

diff --git a/utils.cc b/utils.cc
index c3e613e..c82eb98 100644
--- a/utils.cc
+++ b/utils.cc
@@ -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;