static long apply_delta(off_t len, struct line_buffer *input,
const char *old_data, uint32_t old_mode)
{
long ret;
struct sliding_view preimage = SLIDING_VIEW_INIT(&report_buffer, 0);
FILE *out;
if (init_postimage() || !(out = buffer_tmpfile_rewind(&postimage)))
die("cannot open temporary file for blob retrieval");
if (old_data) {
const char *response;
printf("cat-blob %s\n", old_data);
fflush(stdout);
response = get_response_line();
if (parse_cat_response_line(response, &preimage.max_off))
die("invalid cat-blob response: %s", response);
check_preimage_overflow(preimage.max_off, 1);
}
if (old_mode == REPO_MODE_LNK) {
strbuf_addstr(&preimage.buf, "link ");
check_preimage_overflow(preimage.max_off, strlen("link "));
preimage.max_off += strlen("link ");
check_preimage_overflow(preimage.max_off, 1);
}
if (svndiff0_apply(input, len, &preimage, out))
die("cannot apply delta");
if (old_data) {
/* Read the remainder of preimage and trailing newline. */
assert(!signed_add_overflows(preimage.max_off, 1));
preimage.max_off++; /* room for newline */
if (move_window(&preimage, preimage.max_off - 1, 1))
die("cannot seek to end of input");
if (preimage.buf.buf[0] != '\n')
die("missing newline after cat-blob response");
}
ret = buffer_tmpfile_prepare_to_read(&postimage);
if (ret < 0)
die("cannot read temporary file for blob retrieval");
strbuf_release(&preimage.buf);
return ret;
}
static int apply_delta(int argc, const char **argv)
{
struct line_buffer preimage = LINE_BUFFER_INIT;
struct line_buffer delta = LINE_BUFFER_INIT;
struct sliding_view preimage_view = SLIDING_VIEW_INIT(&preimage, -1);
if (argc != 5)
usage(test_svnfe_usage);
if (buffer_init(&preimage, argv[2]))
die_errno("cannot open preimage");
if (buffer_init(&delta, argv[3]))
die_errno("cannot open delta");
if (svndiff0_apply(&delta, (off_t) strtoumax(argv[4], NULL, 0),
&preimage_view, stdout))
return 1;
if (buffer_deinit(&preimage))
die_errno("cannot close preimage");
if (buffer_deinit(&delta))
die_errno("cannot close delta");
strbuf_release(&preimage_view.buf);
return 0;
}
