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authorJunio C Hamano <gitster@pobox.com>2012-04-03 15:53:08 -0700
committerJunio C Hamano <gitster@pobox.com>2012-04-03 16:24:44 -0700
commitd2c1898571a6a2324593e92163e8754880e0c1fb (patch)
treecef92f7dfe20953916ae3e965bf5cae26b9c51dd /varint.c
parente5056c05ecd2bdaceaa95e12e9e94b1584ec59c8 (diff)
downloadgit-d2c1898571a6a2324593e92163e8754880e0c1fb.tar.gz
varint: make it available outside the context of pack
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'varint.c')
-rw-r--r--varint.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/varint.c b/varint.c
new file mode 100644
index 0000000000..4ed7729496
--- /dev/null
+++ b/varint.c
@@ -0,0 +1,29 @@
+#include "varint.h"
+
+uintmax_t decode_varint(const unsigned char **bufp)
+{
+ const unsigned char *buf = *bufp;
+ unsigned char c = *buf++;
+ uintmax_t val = c & 127;
+ while (c & 128) {
+ val += 1;
+ if (!val || MSB(val, 7))
+ return 0; /* overflow */
+ c = *buf++;
+ val = (val << 7) + (c & 127);
+ }
+ *bufp = buf;
+ return val;
+}
+
+int encode_varint(uintmax_t value, unsigned char *buf)
+{
+ unsigned char varint[16];
+ unsigned pos = sizeof(varint) - 1;
+ varint[pos] = value & 127;
+ while (value >>= 7)
+ varint[--pos] = 128 | (--value & 127);
+ if (buf)
+ memcpy(buf, varint + pos, sizeof(varint) - pos);
+ return sizeof(varint) - pos;
+}