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/* buffer.h - Buffer management layer
Copyright (C) 2004 g10 Code GmbH
This file is part of libgpg-stream.
libgpg-stream is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
libgpg-stream 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
Lesser General Public License for more details.
You should have received a copy of the GNU General Public License
along with libgpg-stream; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#ifndef BUFFER_H
#define BUFFER_H
#include <sys/types.h>
#include <stdarg.h>
#include <gpg-error.h>
#define BUFFER_BLOCK_SIZE 1024
typedef struct buffer *buffer_t;
/* Callbacks, necessary for filling/flushing/seeking. */
typedef gpg_error_t (*buffer_func_read_t) (void *handle,
char *buffer,
size_t bytes_to_read,
size_t *bytes_read);
typedef gpg_error_t (*buffer_func_write_t) (void *handle,
const char *buffer,
size_t bytes_to_write,
size_t *bytes_written);
typedef gpg_error_t (*buffer_func_seek_t) (void *handle,
off_t offset,
int whence);
typedef gpg_error_t (*buffer_func_stat_t) (void *handle,
size_t *size);
typedef struct buffer_functions
{
buffer_func_read_t func_read; /* Read callback. */
buffer_func_write_t func_write; /* Write callback. */
buffer_func_seek_t func_seek; /* Seek callback. */
buffer_func_stat_t func_stat; /* Stat callback. */
} buffer_functions_t;
/* Create a new buffer. */
gpg_error_t buffer_create (buffer_t *buffer,
void *handle,
buffer_functions_t functions);
/* Destroy a buffer. */
gpg_error_t buffer_destroy (buffer_t buffer);
/* Read from a buffer. */
gpg_error_t buffer_read (buffer_t buffer,
char *data,
size_t bytes_to_read,
size_t *bytes_read);
/* Write to a buffer. */
gpg_error_t buffer_write (buffer_t buffer,
const char *data,
size_t bytes_to_write,
size_t *bytes_written);
/* Seek in a buffer. */
gpg_error_t buffer_seek (buffer_t buffer,
off_t offset,
int whence);
/* Return the unread data contained in a buffer. */
gpg_error_t buffer_peek (buffer_t buffer,
char **data,
size_t *data_size);
/* Skip SIZE bytes of input data contained in buffer. */
gpg_error_t buffer_skip (buffer_t buffer,
size_t size);
/* Write out unwritten data contained in buffer. */
gpg_error_t buffer_flush (buffer_t buffer);
/* Stat buffer. */
gpg_error_t buffer_stat (buffer_t buffer,
size_t *size);
#endif
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