Function parse_binary_hunk

apply.c:2018–2124

* Read a binary hunk and return a new fragment; fragment->patch * points at an allocated memory that the caller must free, so * it is marked as "->free_patch = 1". */

 * it is marked as "->free_patch = 1".
 */
static struct fragment *parse_binary_hunk(struct apply_state *state,
					  char **buf_p,
					  unsigned long *sz_p,
					  int *status_p,
					  int *used_p)
{
	/*
	 * Expect a line that begins with binary patch method ("literal"
	 * or "delta"), followed by the length of data before deflating.
	 * a sequence of 'length-byte' followed by base-85 encoded data
	 * should follow, terminated by a newline.
	 *
	 * Each 5-byte sequence of base-85 encodes up to 4 bytes,
	 * and we would limit the patch line to 66 characters,
	 * so one line can fit up to 13 groups that would decode
	 * to 52 bytes max.  The length byte 'A'-'Z' corresponds
	 * to 1-26 bytes, and 'a'-'z' corresponds to 27-52 bytes.
	 */
	int llen, used;
	unsigned long size = *sz_p;
	char *buffer = *buf_p;
	int patch_method;
	unsigned long origlen;
	char *data = NULL;
	int hunk_size = 0;
	struct fragment *frag;

	llen = linelen(buffer, size);
	used = llen;

	*status_p = 0;

	if (starts_with(buffer, "delta ")) {
		patch_method = BINARY_DELTA_DEFLATED;
		origlen = strtoul(buffer + 6, NULL, 10);
	}
	else if (starts_with(buffer, "literal ")) {
		patch_method = BINARY_LITERAL_DEFLATED;
		origlen = strtoul(buffer + 8, NULL, 10);
	}
	else
		return NULL;

	state->linenr++;
	buffer += llen;
	size -= llen;
	while (1) {
		int byte_length, max_byte_length, newsize;
		llen = linelen(buffer, size);
		used += llen;
		state->linenr++;
		if (llen == 1) {
			/* consume the blank line */
			buffer++;
			size--;
			break;
		}
		/*