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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.

*/

#ifndef INCLUDE_filebuf_h__

#define INCLUDE_filebuf_h__

#include "fileops.h"

#include "hash.h"

#include <zlib.h>

#ifdef GIT_THREADS

# define GIT_FILEBUF_THREADS

#endif

#define GIT_FILEBUF_HASH_CONTENTS (1 << 0)

#define GIT_FILEBUF_APPEND (1 << 2)

#define GIT_FILEBUF_FORCE (1 << 3)

#define GIT_FILEBUF_TEMPORARY (1 << 4)

#define GIT_FILEBUF_DO_NOT_BUFFER (1 << 5)

#define GIT_FILEBUF_DEFLATE_SHIFT (6)

#define GIT_FILELOCK_EXTENSION ".lock\0"

#define GIT_FILELOCK_EXTLENGTH 6

typedef struct git_filebuf git_filebuf;

struct git_filebuf {

char *path_original;

char *path_lock;

int (*write)(git_filebuf *file, void *source, size_t len);

bool compute_digest;

git_hash_ctx digest;

unsigned char *buffer;

unsigned char *z_buf;

z_stream zs;

int flush_mode;

size_t buf_size, buf_pos;

git_file fd;

bool fd_is_open;

bool created_lock;

bool did_rename;

bool do_not_buffer;

int last_error;

};

#define GIT_FILEBUF_INIT {0}

/*

* The git_filebuf object lifecycle is:

* - Allocate git_filebuf, preferably using GIT_FILEBUF_INIT.

*

* - Call git_filebuf_open() to initialize the filebuf for use.

*

* - Make as many calls to git_filebuf_write(), git_filebuf_printf(),

* git_filebuf_reserve() as you like. The error codes for these

* functions don't need to be checked. They are stored internally

* by the file buffer.

*

* - While you are writing, you may call git_filebuf_hash() to get

* the hash of all you have written so far. This function will

* fail if any of the previous writes to the buffer failed.

*

* - To close the git_filebuf, you may call git_filebuf_commit() or

* git_filebuf_commit_at() to save the file, or

* git_filebuf_cleanup() to abandon the file. All of these will

* free the git_filebuf object. Likewise, all of these will fail

* if any of the previous writes to the buffer failed, and set

* an error code accordingly.

*/

int git_filebuf_write(git_filebuf *lock, const void *buff, size_t len);

int git_filebuf_reserve(git_filebuf *file, void **buff, size_t len);

int git_filebuf_printf(git_filebuf *file, const char *format, ...) GIT_FORMAT_PRINTF(2, 3);

int git_filebuf_open(git_filebuf *lock, const char *path, int flags, mode_t mode);

int git_filebuf_commit(git_filebuf *lock);

int git_filebuf_commit_at(git_filebuf *lock, const char *path);

void git_filebuf_cleanup(git_filebuf *lock);

int git_filebuf_hash(git_oid *oid, git_filebuf *file);

int git_filebuf_flush(git_filebuf *file);

int git_filebuf_stats(time_t *mtime, size_t *size, git_filebuf *file);

#endif