thodg/libgit2/src/blob.c

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• Hash : 97769280
  Author :
  Date : 2011-11-30T11:27:15
  

  Use git_buf for path storage instead of stack-based buffers This converts virtually all of the places that allocate GIT_PATH_MAX buffers on the stack for manipulating paths to use git_buf objects instead. The patch is pretty careful not to touch the public API for libgit2, so there are a few places that still use GIT_PATH_MAX. This extends and changes some details of the git_buf implementation to add a couple of extra functions and to make error handling easier. This includes serious alterations to all the path.c functions, and several of the fileops.c ones, too. Also, there are a number of new functions that parallel existing ones except that use a git_buf instead of a stack-based buffer (such as git_config_find_global_r that exists alongsize git_config_find_global). This also modifies the win32 version of p_realpath to allocate whatever buffer size is needed to accommodate the realpath instead of hardcoding a GIT_PATH_MAX limit, but that change needs to be tested still.

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• src/blob.c

• /*
   * Copyright (C) 2009-2011 the libgit2 contributors
   *
   * 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/common.h"
  #include "git2/object.h"
  #include "git2/repository.h"
  
  #include "common.h"
  #include "blob.h"
  
  const void *git_blob_rawcontent(git_blob *blob)
  {
  	assert(blob);
  	return blob->odb_object->raw.data;
  }
  
  size_t git_blob_rawsize(git_blob *blob)
  {
  	assert(blob);
  	return blob->odb_object->raw.len;
  }
  
  void git_blob__free(git_blob *blob)
  {
  	git_odb_object_free(blob->odb_object);
  	git__free(blob);
  }
  
  int git_blob__parse(git_blob *blob, git_odb_object *odb_obj)
  {
  	assert(blob);
  	git_cached_obj_incref((git_cached_obj *)odb_obj);
  	blob->odb_object = odb_obj;
  	return GIT_SUCCESS;
  }
  
  int git_blob_create_frombuffer(git_oid *oid, git_repository *repo, const void *buffer, size_t len)
  {
  	int error;
  	git_odb *odb;
  	git_odb_stream *stream;
  
  	error = git_repository_odb__weakptr(&odb, repo);
  	if (error < GIT_SUCCESS)
  		return error;
  
  	if ((error = git_odb_open_wstream(&stream, odb, len, GIT_OBJ_BLOB)) < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to create blob");
  
  	if ((error = stream->write(stream, buffer, len)) < GIT_SUCCESS) {
  		stream->free(stream);
  		return error;
  	}
  
  	error = stream->finalize_write(oid, stream);
  	stream->free(stream);
  
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to create blob");
  
  	return GIT_SUCCESS;
  }
  
  int git_blob_create_fromfile(git_oid *oid, git_repository *repo, const char *path)
  {
  	int error = GIT_SUCCESS;
  	int islnk = 0;
  	int fd = 0;
  	git_buf full_path = GIT_BUF_INIT;
  	char buffer[2048];
  	git_off_t size;
  	git_odb_stream *stream = NULL;
  	struct stat st;
  	const char *workdir;
  	git_odb *odb;
  
  	workdir = git_repository_workdir(repo);
  	if (workdir == NULL)
  		return git__throw(GIT_ENOTFOUND, "Failed to create blob. (No working directory found)");
  
  	error = git_buf_joinpath(&full_path, workdir, path);
  	if (error < GIT_SUCCESS)
  		return error;
  
  	error = p_lstat(full_path.ptr, &st);
  	if (error < 0) {
  		error = git__throw(GIT_EOSERR, "Failed to stat blob. %s", strerror(errno));
  		goto cleanup;
  	}
  
  	islnk = S_ISLNK(st.st_mode);
  	size = st.st_size;
  
  	error = git_repository_odb__weakptr(&odb, repo);
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	if (!islnk) {
  		if ((fd = p_open(full_path.ptr, O_RDONLY)) < 0) {
  			error = git__throw(GIT_ENOTFOUND, "Failed to create blob. Could not open '%s'", full_path.ptr
  );
  			goto cleanup;
  		}
  	}
  
  	if ((error = git_odb_open_wstream(&stream, odb, (size_t)size, GIT_OBJ_BLOB)) < GIT_SUCCESS)
  		goto cleanup;
  
  	while (size > 0) {
  		ssize_t read_len;
  
  		if (!islnk)
  			read_len = p_read(fd, buffer, sizeof(buffer));
  		else
  			read_len = p_readlink(full_path.ptr, buffer, sizeof(buffer));
  
  		if (read_len < 0) {
  			error = git__throw(GIT_EOSERR, "Failed to create blob. Can't read full file");
  			goto cleanup;
  		}
  
  		stream->write(stream, buffer, read_len);
  		size -= read_len;
  	}
  
  	error = stream->finalize_write(oid, stream);
  
  cleanup:
  	if (stream)
  		stream->free(stream);
  	if (!islnk && fd)
  		p_close(fd);
  	git_buf_free(&full_path);
  
  	return error == GIT_SUCCESS ? GIT_SUCCESS :
  		git__rethrow(error, "Failed to create blob");
  }
  
  

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