Add comment explaining why we need custom logic to parse int
Test: no need
Change-Id: I71df7c09b260881b8753b77b6950ce97740d3191
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;