Function unpack_object_header_buffer

packfile.c:1137–1164

}

unsigned long unpack_object_header_buffer(const unsigned char *buf,
		unsigned long len, enum object_type *type, size_t *sizep)
{
	unsigned shift;
	size_t size, c;
	unsigned long used = 0;

	c = buf[used++];
	*type = (c >> 4) & 7;
	size = c & 15;
	shift = 4;
	while (c & 0x80) {
		/*
		 * Each continuation byte adds 7 bits. Ensure shift won't
		 * overflow size_t (use size_t not long for 64-bit on Windows).
		 */
		if (len <= used || (bitsizeof(size_t) - 7) < shift) {
			error("bad object header");
			size = used = 0;
			break;
		}
		c = buf[used++];
		size = st_add(size, st_left_shift(c & 0x7f, shift));
		shift += 7;
	}
	*sizep = size;
	return used;
}

/*
 * Read a delta object's header at curpos in p (already inflated as needed)