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/*
* 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;
}
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