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zio.h

/*                                                            -*- C -*-
 * Copyright (c) 2001, 02
 *    Motoyuki Kasahara
 *
 * This program 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, or (at your option)
 * any later version.
 *
 * This program 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.
 */

#ifndef ZIO_H
#define ZIO_H

#ifdef __cplusplus
extern "C" {
#endif

#include <sys/types.h>

#if TIME_WITH_SYS_TIME
# include <sys/time.h>
# include <time.h>
#else
# if HAVE_SYS_TIME_H
#  include <sys/time.h>
# else
#  include <time.h>
# endif
#endif

#ifdef ENABLE_PTHREAD
#include <pthread.h>
#endif

/*
 * Header size of the ebzip compression file.
 */
#define ZIO_SIZE_EBZIP_HEADER       22

/*
 * Margin size for ebzip compression buffer.
 * (Since compressed data is larger than original in the worst case,
 * we must add margin to a compression buffer.)
 */
#define ZIO_SIZE_EBZIP_MARGIN       1024

/*
 * Maximum ebzio compression level.
 */
#define ZIO_MAX_EBZIP_LEVEL         5

/*
 * Huffman node types.
 */
#define ZIO_HUFFMAN_NODE_INTERMEDIATE     0
#define ZIO_HUFFMAN_NODE_EOF        1
#define ZIO_HUFFMAN_NODE_LEAF8            2
#define ZIO_HUFFMAN_NODE_LEAF16           3
#define ZIO_HUFFMAN_NODE_LEAF32           4

/*
 * Compression type codes.
 */
#define ZIO_PLAIN             0
#define ZIO_EBZIP1                  1
#define ZIO_EPWING                  2
#define ZIO_EPWING6                 3
#define ZIO_SEBXA             4
#define ZIO_INVALID                 -1
#define ZIO_REOPEN                  -2

/*
 * Compression type.
 */
typedef int Zio_Code;

/*
 * A node of static Huffman tree.
 */
typedef struct Zio_Huffman_Node_Struct Zio_Huffman_Node;

struct Zio_Huffman_Node_Struct {
    /*
     * node type (ITNERMEDIATE, LEAF8, LEAF16, LEAF32 or EOF).
     */
    int type;

    /*
     * Value of a leaf node.
     */
    unsigned int value;

    /*
     * Frequency of a node.
     */
    int frequency;

    /*
     * Left child.
     */
    Zio_Huffman_Node *left;

    /*
     * Right child.
     */
    Zio_Huffman_Node *right;
};

/*
 * Compression information of a book.
 */
typedef struct Zio_Struct Zio;

struct Zio_Struct {
    /*
     * ID.
     */
    int id;

    /*
     * Zio type. (PLAIN, EBZIP, EPWING, EPWING6 or SEBXA)
     */
    Zio_Code code;

    /*
     * File descriptor.
     */
    int file;

    /*
     * Current location.
     */
    off_t location;

    /*
     * Size of an uncompressed file.
     */
    off_t file_size;

    /*
     * Slice size of an EBZIP compressed file.
     */
    size_t slice_size;

    /*
     * Compression level. (EBZIP compression only)
     */
    int zip_level;

    /*
     * Length of an index. (EBZIP compression only)
     */
    int index_width;

    /*
     * Adler-32 check sum of an uncompressed file. (EBZIP compression only)
     */
    unsigned int crc;

    /*
     * mtime of an uncompressed file. (EBZIP compression only)
     */
    time_t mtime;

    /*
     * Location of an index table. (EPWING and S-EBXA compression only)
     */
    off_t index_location;

    /*
     * Length of an index table. (EPWING and S-EBXA compression only)
     */
    size_t index_length;

    /*
     * Location of a frequency table. (EPWING compression only)
     */
    off_t frequencies_location;

    /*
     * Length of a frequency table. (EPWING compression only)
     */
    size_t frequencies_length;

    /*
     * Huffman tree nodes. (EPWING compression only)
     */
    Zio_Huffman_Node *huffman_nodes;

    /*
     * Root node of a Huffman tree. (EPWING compression only)
     */
    Zio_Huffman_Node *huffman_root;

    /*
     * Region of compressed pages. (S-EBXA compression only)
     */
    off_t zio_start_location;
    off_t zio_end_location;

    /*
     * Add this value to offset written in index. (S-EBXA compression only)
     */
    off_t index_base;
};

/*
 * Trick for function protypes.
 */
#if defined(__STDC__) || defined(__cplusplus) || defined(WIN32)
#define ZIO_P(p) p
#else /* not (__STDC__ && __cplusplus && WIN32) */
#define ZIO_P(p) ()
#endif /* not (__STDC__ && __cplusplus && WIN32) */

/*
 * Function declarations.
 */
/* zio.c */
int zio_initialize_library ZIO_P((void));
void zio_finalize_library ZIO_P((void));
void zio_initialize ZIO_P((Zio *));
void zio_finalize ZIO_P((Zio *));
int zio_set_sebxa_mode ZIO_P((Zio *, off_t, off_t, off_t, off_t));
int zio_open ZIO_P((Zio *, const char *, Zio_Code));
void zio_close ZIO_P((Zio *));
int zio_file ZIO_P((Zio *));
Zio_Code zio_mode ZIO_P((Zio *));
off_t zio_lseek ZIO_P((Zio *, off_t, int));
ssize_t zio_read ZIO_P((Zio *, char *, size_t));

#ifdef __cplusplus
}
#endif

#endif /* not ZIO_H */

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