thodg/libgit2/src/ident.c

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• Hash : eab3746b
  Author :
  Date : 2013-09-15T22:23:39
  

  More filtering tests including order This adds more tests of filters, including the ident filter when mixed with custom filters. I was able to combine with the reverse filter and demonstrate that the order of filter application with the default priority constants matches the order of core Git. Also, this fixes two issues in the ident filter: preventing ident expansion on binary files and avoiding a NULL dereference when dollar sign characters are found without Id.

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• src/ident.c

• /*
   * 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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