---
builtin/index-pack.c | 82 ++++++++++++++++++++++++++++------------------------
1 file changed, 45 insertions(+), 37 deletions(-)
diff --git a/builtin/index-pack.c b/builtin/index-pack.c
index 1dbabe0..5fbd517 100644
--- a/builtin/index-pack.c
+++ b/builtin/index-pack.c
@@ -277,6 +277,31 @@ static void use(int bytes)
consumed_bytes += bytes;
}
+static inline void *fill_and_use(int bytes)
+{
+ void *p = fill(bytes);
+ use(bytes);
+ return p;
+}
+
+static NORETURN void bad_object(unsigned long offset, const char *format,
+ ...) __attribute__((format (printf, 2, 3)));
+
+static uintmax_t read_varint(void)
+{
+ unsigned char c = *(char*)fill_and_use(1);
+ uintmax_t val = c & 127;
+ while (c & 128) {
+ val += 1;
+ if (!val || MSB(val, 7))
+ bad_object(consumed_bytes,
+ _("offset overflow in read_varint"));
+ c = *(char*)fill_and_use(1);
+ val = (val << 7) + (c & 127);
+ }
+ return val;
+}
+
static const char *open_pack_file(const char *pack_name)
{
if (from_stdin) {
@@ -317,9 +342,6 @@ static void parse_pack_header(void)
use(sizeof(struct pack_header));
}
-static NORETURN void bad_object(unsigned long offset, const char *format,
- ...) __attribute__((format (printf, 2, 3)));
-
static NORETURN void bad_object(unsigned long offset, const char *format, ...)
{
va_list params;
@@ -462,55 +484,41 @@ static void *unpack_entry_data(unsigned long offset,
unsigned long size,
return buf == fixed_buf ? NULL : buf;
}
+static void read_typesize_v2(struct object_entry *obj)
+{
+ unsigned char c = *(char*)fill_and_use(1);
+ unsigned shift;
+
+ obj->type = (c >> 4) & 7;
+ obj->size = (c & 15);
+ shift = 4;
+ while (c & 128) {
+ c = *(char*)fill_and_use(1);
+ obj->size += (c & 0x7f) << shift;
+ shift += 7;
+ }
+}
+
static void *unpack_raw_entry(struct object_entry *obj,
union delta_base *delta_base,
unsigned char *sha1)
{
- unsigned char *p;
- unsigned long size, c;
- off_t base_offset;
- unsigned shift;
void *data;
+ uintmax_t val;
obj->idx.offset = consumed_bytes;
input_crc32 = crc32(0, NULL, 0);
- p = fill(1);
- c = *p;
- use(1);
- obj->type = (c >> 4) & 7;
- size = (c & 15);
- shift = 4;
- while (c & 0x80) {
- p = fill(1);
- c = *p;
- use(1);
- size += (c & 0x7f) << shift;
- shift += 7;
- }
- obj->size = size;
+ read_typesize_v2(obj);
switch (obj->type) {
case OBJ_REF_DELTA:
- hashcpy(delta_base->sha1, fill(20));
- use(20);
+ hashcpy(delta_base->sha1, fill_and_use(20));
break;
case OBJ_OFS_DELTA:
memset(delta_base, 0, sizeof(*delta_base));
- p = fill(1);
- c = *p;
- use(1);
- base_offset = c & 127;
- while (c & 128) {
- base_offset += 1;
- if (!base_offset || MSB(base_offset, 7))
- bad_object(obj->idx.offset, _("offset value
overflow for delta base object"));
- p = fill(1);
- c = *p;
- use(1);
- base_offset = (base_offset << 7) + (c & 127);
- }
- delta_base->offset = obj->idx.offset - base_offset;
+ val = read_varint();
+ delta_base->offset = obj->idx.offset - val;
if (delta_base->offset <= 0 || delta_base->offset >=
obj->idx.offset)
bad_object(obj->idx.offset, _("delta base offset is out
of bound"));
break;
--
1.8.2.83.gc99314b
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