/*
* Copyright (c) 2017 Stefan Sperling <stsp@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/queue.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sha1.h>
#include <zlib.h>
#include "got_repository.h"
#include "got_object.h"
#include "got_error.h"
#include "diff.h"
static const struct got_error *
open_tempfile(FILE **sfp, char **sfn)
{
static const int sfnlen = 20;
int fd;
*sfn = calloc(sfnlen, sizeof(char));
if (*sfn == NULL)
return got_error(GOT_ERR_NO_MEM);
strlcpy(*sfn, "/tmp/got.XXXXXXXXXX", sfnlen);
if ((fd = mkstemp(*sfn)) == -1 ||
((*sfp) = fdopen(fd, "w+")) == NULL) {
if (fd != -1) {
unlink(*sfn);
close(fd);
}
free(*sfn);
return got_error(GOT_ERR_FILE_OPEN);
}
return NULL;
}
const struct got_error *
got_diff_blob(struct got_blob_object *blob1, struct got_blob_object *blob2,
FILE *outfile)
{
struct got_diff_state ds;
struct got_diff_args args;
const struct got_error *err = NULL;
FILE *f1, *f2;
char *n1, *n2;
size_t len, hdrlen;
char hex1[SHA1_DIGEST_STRING_LENGTH];
char hex2[SHA1_DIGEST_STRING_LENGTH];
int res;
err = open_tempfile(&f1, &n1);
if (err != NULL)
return err;
err = open_tempfile(&f2, &n2);
if (err != NULL) {
fclose(f1);
free(n1);
return err;
}
hdrlen = blob1->hdrlen;
do {
err = got_object_blob_read_block(blob1, &len);
if (err)
goto done;
/* Skip blob object header first time around. */
fwrite(blob1->zb.outbuf + hdrlen, len - hdrlen, 1, f1);
hdrlen = 0;
} while (len != 0);
hdrlen = blob2->hdrlen;
do {
err = got_object_blob_read_block(blob2, &len);
if (err)
goto done;
/* Skip blob object header first time around. */
fwrite(blob2->zb.outbuf + hdrlen, len - hdrlen, 1, f2);
hdrlen = 0;
} while (len != 0);
fflush(f1);
fflush(f2);
memset(&ds, 0, sizeof(ds));
memset(&args, 0, sizeof(args));
args.diff_format = D_UNIFIED;
args.label[0] = got_object_id_str(&blob1->id, hex1, sizeof(hex1));
args.label[1] = got_object_id_str(&blob2->id, hex2, sizeof(hex2));
err = got_diffreg(&res, n1, n2, 0, &args, &ds);
done:
unlink(n1);
unlink(n2);
fclose(f1);
fclose(f2);
free(n1);
free(n2);
return err;
}
