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; }