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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "git2/sys/filter.h"
#include "filter.h"
#include "buffer.h"
#include "buf_text.h"
static int ident_find_id(
const char **id_start, const char **id_end, const char *start, size_t len)
{
const char *end = start + len, *found = NULL;
while (len > 3 && (found = memchr(start, '$', len)) != NULL) {
size_t remaining = (size_t)(end - found) - 1;
if (remaining < 3)
return GIT_ENOTFOUND;
start = found + 1;
len = remaining;
if (start[0] == 'I' && start[1] == 'd')
break;
}
if (len < 3 || !found)
return GIT_ENOTFOUND;
*id_start = found;
if ((found = memchr(start + 2, '$', len - 2)) == NULL)
return GIT_ENOTFOUND;
*id_end = found + 1;
return 0;
}
static int ident_insert_id(
git_buf *to, const git_buf *from, const git_filter_source *src)
{
char oid[GIT_OID_HEXSZ+1];
const char *id_start, *id_end, *from_end = from->ptr + from->size;
size_t need_size;
/* replace $Id$ with blob id */
if (!git_filter_source_id(src))
return GIT_PASSTHROUGH;
git_oid_tostr(oid, sizeof(oid), git_filter_source_id(src));
if (ident_find_id(&id_start, &id_end, from->ptr, from->size) < 0)
return GIT_PASSTHROUGH;
need_size = (size_t)(id_start - from->ptr) +
5 /* "$Id: " */ + GIT_OID_HEXSZ + 1 /* "$" */ +
(size_t)(from_end - id_end);
if (git_buf_grow(to, need_size) < 0)
return -1;
git_buf_set(to, from->ptr, (size_t)(id_start - from->ptr));
git_buf_put(to, "$Id: ", 5);
git_buf_put(to, oid, GIT_OID_HEXSZ);
git_buf_putc(to, '$');
git_buf_put(to, id_end, (size_t)(from_end - id_end));
return git_buf_oom(to) ? -1 : 0;
}
static int ident_remove_id(
git_buf *to, const git_buf *from)
{
const char *id_start, *id_end, *from_end = from->ptr + from->size;
size_t need_size;
if (ident_find_id(&id_start, &id_end, from->ptr, from->size) < 0)
return GIT_PASSTHROUGH;
need_size = (size_t)(id_start - from->ptr) +
4 /* "$Id$" */ + (size_t)(from_end - id_end);
if (git_buf_grow(to, need_size) < 0)
return -1;
git_buf_set(to, from->ptr, (size_t)(id_start - from->ptr));
git_buf_put(to, "$Id$", 4);
git_buf_put(to, id_end, (size_t)(from_end - id_end));
return git_buf_oom(to) ? -1 : 0;
}
static int ident_apply(
git_filter *self,
void **payload,
git_buf *to,
const git_buf *from,
const git_filter_source *src)
{
GIT_UNUSED(self); GIT_UNUSED(payload);
/* Don't filter binary files */
if (git_buf_text_is_binary(from))
return GIT_PASSTHROUGH;
if (git_filter_source_mode(src) == GIT_FILTER_SMUDGE)
return ident_insert_id(to, from, src);
else
return ident_remove_id(to, from);
}
git_filter *git_ident_filter_new(void)
{
git_filter *f = git__calloc(1, sizeof(git_filter));
f->version = GIT_FILTER_VERSION;
f->attributes = "+ident"; /* apply to files with ident attribute set */
f->shutdown = git_filter_free;
f->apply = ident_apply;
return f;
}
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