From 9e1d2fe1b6484bf6e693d104a7a30d0162d53e85 Mon Sep 17 00:00:00 2001
From: Kelvin Zhang <zhangkelvin@google.com>
Date: Mon, 19 Apr 2021 19:47:48 -0400
Subject: Add comment explaining why we need custom logic to parse int

Test: no need
Change-Id: I71df7c09b260881b8753b77b6950ce97740d3191
---
 utils.cc | 5 +++++
 1 file changed, 5 insertions(+)

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;
-- 
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