mirror of
https://github.com/git/git.git
synced 2024-12-03 23:14:23 +08:00
53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
|
/*
|
||
|
|
* Licensed under a two-clause BSD-style license.
|
||
|
|
* See LICENSE for details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "git-compat-util.h"
|
||
|
|
#include "line_buffer.h"
|
||
|
|
#include "svndiff.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
* svndiff0 applier
|
||
|
|
*
|
||
|
|
* See http://svn.apache.org/repos/asf/subversion/trunk/notes/svndiff.
|
||
|
|
*
|
||
|
|
* svndiff0 ::= 'SVN\0' window*
|
||
|
|
*/
|
||
|
|
|
||
|
|
static int error_short_read(struct line_buffer *input)
|
||
|
|
{
|
||
|
|
if (buffer_ferror(input))
|
||
|
|
return error("error reading delta: %s", strerror(errno));
|
||
|
|
return error("invalid delta: unexpected end of file");
|
||
|
|
}
|
||
|
|
|
||
|
|
static int read_magic(struct line_buffer *in, off_t *len)
|
||
|
|
{
|
||
|
|
static const char magic[] = {'S', 'V', 'N', '\0'};
|
||
|
|
struct strbuf sb = STRBUF_INIT;
|
||
|
|
|
||
|
|
if (*len < sizeof(magic) ||
|
||
|
|
buffer_read_binary(in, &sb, sizeof(magic)) != sizeof(magic))
|
||
|
|
return error_short_read(in);
|
||
|
|
|
||
|
|
if (memcmp(sb.buf, magic, sizeof(magic)))
|
||
|
|
return error("invalid delta: unrecognized file type");
|
||
|
|
|
||
|
|
*len -= sizeof(magic);
|
||
|
|
strbuf_release(&sb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int svndiff0_apply(struct line_buffer *delta, off_t delta_len,
|
||
|
|
struct sliding_view *preimage, FILE *postimage)
|
||
|
|
{
|
||
|
|
assert(delta && preimage && postimage);
|
||
|
|
|
||
|
|
if (read_magic(delta, &delta_len))
|
||
|
|
return -1;
|
||
|
|
if (delta_len)
|
||
|
|
return error("What do you think I am? A delta applier?");
|
||
|
|
return 0;
|
||
|
|
}
|