thodg/libgit2/src/status.c

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• Hash : 205166d2
  Author :
  Date : 2011-06-22T18:19:46
  

  status: get blob object id of file on disk
  
  Add git_status_hashfile() to get blob's object id for a file without adding
  it to the object database or needing a repository at all.
  This functionality is similar to `git hash-object` without '-w'.
  

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• src/status.c

• /*
   * This file is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License, version 2,
   * as published by the Free Software Foundation.
   *
   * In addition to the permissions in the GNU General Public License,
   * the authors give you unlimited permission to link the compiled
   * version of this file into combinations with other programs,
   * and to distribute those combinations without any restriction
   * coming from the use of this file.  (The General Public License
   * restrictions do apply in other respects; for example, they cover
   * modification of the file, and distribution when not linked into
   * a combined executable.)
   *
   * This file is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; see the file COPYING.  If not, write to
   * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   */
  
  #include "common.h"
  #include "git2.h"
  #include "fileops.h"
  #include "hash.h"
  
  int git_status_hashfile(git_oid *out, const char *path)
  {
  	int fd, len;
  	char hdr[64], buffer[2048];
  	git_off_t size;
  	git_hash_ctx *ctx;
  
  	if ((fd = p_open(path, O_RDONLY)) < 0)
  		return git__throw(GIT_ENOTFOUND, "Could not open '%s'", path);
  
  	if ((size = git_futils_filesize(fd)) < 0 || !git__is_sizet(size)) {
  		p_close(fd);
  		return git__throw(GIT_EOSERR, "'%s' appears to be corrupted", path);
  	}
  
  	ctx = git_hash_new_ctx();
  
  	len = snprintf(hdr, sizeof(hdr), "blob %"PRIuZ, (size_t)size);
  	assert(len > 0);
  	assert(((size_t) len) < sizeof(hdr));
  	if (len < 0 || ((size_t) len) >= sizeof(hdr))
  		return git__throw(GIT_ERROR, "Failed to format blob header. Length is out of bounds");
  
  	git_hash_update(ctx, hdr, len+1);
  
  	while (size > 0) {
  		ssize_t read_len;
  
  		read_len = read(fd, buffer, sizeof(buffer));
  
  		if (read_len < 0) {
  			p_close(fd);
  			git_hash_free_ctx(ctx);
  			return git__throw(GIT_EOSERR, "Can't read full file '%s'", path);
  		}
  
  		git_hash_update(ctx, buffer, read_len);
  		size -= read_len;
  	}
  
  	p_close(fd);
  
  	git_hash_final(out, ctx);
  	git_hash_free_ctx(ctx);
  
  	return GIT_SUCCESS;
  }
  

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