/*
** Copyright (C) 2004-2006 by Carnegie Mellon University.
**
** @OPENSOURCE_HEADER_START@
**
** Use of the SILK system and related source code is subject to the terms
** of the following licenses:
**
** GNU Public License (GPL) Rights pursuant to Version 2, June 1991
** Government Purpose License Rights (GPLR) pursuant to DFARS 252.225-7013
**
** NO WARRANTY
**
** ANY INFORMATION, MATERIALS, SERVICES, INTELLECTUAL PROPERTY OR OTHER
** PROPERTY OR RIGHTS GRANTED OR PROVIDED BY CARNEGIE MELLON UNIVERSITY
** PURSUANT TO THIS LICENSE (HEREINAFTER THE "DELIVERABLES") ARE ON AN
** "AS-IS" BASIS. CARNEGIE MELLON UNIVERSITY MAKES NO WARRANTIES OF ANY
** KIND, EITHER EXPRESS OR IMPLIED AS TO ANY MATTER INCLUDING, BUT NOT
** LIMITED TO, WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE,
** MERCHANTABILITY, INFORMATIONAL CONTENT, NONINFRINGEMENT, OR ERROR-FREE
** OPERATION. CARNEGIE MELLON UNIVERSITY SHALL NOT BE LIABLE FOR INDIRECT,
** SPECIAL OR CONSEQUENTIAL DAMAGES, SUCH AS LOSS OF PROFITS OR INABILITY
** TO USE SAID INTELLECTUAL PROPERTY, UNDER THIS LICENSE, REGARDLESS OF
** WHETHER SUCH PARTY WAS AWARE OF THE POSSIBILITY OF SUCH DAMAGES.
** LICENSEE AGREES THAT IT WILL NOT MAKE ANY WARRANTY ON BEHALF OF
** CARNEGIE MELLON UNIVERSITY, EXPRESS OR IMPLIED, TO ANY PERSON
** CONCERNING THE APPLICATION OF OR THE RESULTS TO BE OBTAINED WITH THE
** DELIVERABLES UNDER THIS LICENSE.
**
** Licensee hereby agrees to defend, indemnify, and hold harmless Carnegie
** Mellon University, its trustees, officers, employees, and agents from
** all claims or demands made against them (and any related losses,
** expenses, or attorney's fees) arising out of, or relating to Licensee's
** and/or its sub licensees' negligent use or willful misuse of or
** negligent conduct or willful misconduct regarding the Software,
** facilities, or other rights or assistance granted by Carnegie Mellon
** University under this License, including, but not limited to, any
** claims of product liability, personal injury, death, damage to
** property, or violation of any laws or regulations.
**
** Carnegie Mellon University Software Engineering Institute authored
** documents are sponsored by the U.S. Department of Defense under
** Contract F19628-00-C-0003. Carnegie Mellon University retains
** copyrights in all material produced under this contract. The U.S.
** Government retains a non-exclusive, royalty-free license to publish or
** reproduce these documents, or allow others to do so, for U.S.
** Government purposes only pursuant to the copyright license under the
** contract clause at 252.227.7013.
**
** @OPENSOURCE_HEADER_END@
*/
#ifndef _LZO_FILE_H
#define _LZO_FILE_H

#include "silk.h"

RCSIDENTVAR(rcsID_LZO_FILE_H, "$SiLK: lzo-file.h 2978 2006-02-09 20:54:19Z mthomas $");

/*
**  lzo-file.h
**
**  Wrapper around the liblzo compression library.
**
*/

#include SK_LZO_HEADER_NAME


#define LZO_MAX_BUF_SIZE  65536
/* The following formula is in the lzo faq:
   http://www.oberhumer.com/opensource/lzo/lzofaq.php */
#define LZO_MAX_COMP_SIZE (LZO_MAX_BUF_SIZE + (LZO_MAX_BUF_SIZE / 16) + 64 + 3)

/* The type of lzo compression buffers */
typedef struct compr_buffer *lzo_compr_buffer_t;
/* The type of lzo decompression buffers */
typedef struct decompr_buffer *lzo_decompr_buffer_t;

/* Creates an lzo compression buffer.  Returns NULL on error. */
lzo_compr_buffer_t lzo_create_compr_buffer(void);
/* Creates an lzo decompression buffer.  Returns NULL on error. */
lzo_decompr_buffer_t lzo_create_decompr_buffer(void);

/* Destroys an lzo compression buffer. */
#define lzo_destroy_compr_buffer free
/* Destroys an lzo decompression buffer. */
#define lzo_destroy_decompr_buffer free

/* Associates a file and the file's location with an lzo compression
   buffer. */
void lzo_bind_compr_buffer(lzo_compr_buffer_t fd, FILE *file);
/* Associates a file and the file's location with an lzo decompression
   buffer. */
void lzo_bind_decompr_buffer(lzo_decompr_buffer_t fd, FILE *file);

/* Reads count uncompressed bytes into buf from the decompression
   buffer fd.  Returns number of bytes read on success, -1 on failure.
   Will return 0 when it has reached the end on the compressed
   section. */
ssize_t lzo_read(lzo_decompr_buffer_t fd, void *buf, size_t count);

/* Writes count uncompressed bytes from buf into the compression
   buffer fd.  Returns number of bytes written on success, -1 on
   failure. */
ssize_t lzo_write(lzo_compr_buffer_t fd, void *buf, size_t count);

/* Finishes a series of compressed writes.  Returns the total
   compressed size of the compressed section on success, -1 on
   error. */
off_t lzo_flush(lzo_compr_buffer_t fd);

/* Returns an lower-bound estimate of the current compressed size of
   what has been written in the current section.  -1 on error. */
off_t lzo_compr_size(lzo_compr_buffer_t fd);

/* Returns an upper-bound estimate of the current compressed size of
   what has been written in the current section.  -1 on error. */
off_t lzo_compr_size_upper_bound(lzo_compr_buffer_t fd);

/* Returns a string representing the error state of fd. */
char *lzo_compr_strerror(lzo_compr_buffer_t fd);

/* Returns a string representing the error state of fd. */
char *lzo_decompr_strerror(lzo_decompr_buffer_t fd);

#endif /* _LZO_FILE_H */