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https://github.com/xiaoyifang/goldendict-ng.git
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238 lines
5.4 KiB
C
238 lines
5.4 KiB
C
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/* -*- C -*-
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* Copyright (c) 2001-2006 Motoyuki Kasahara
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef ZIO_H
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#define ZIO_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/types.h>
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#include <time.h>
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/*
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* Header size of the ebzip compression file.
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*/
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#define ZIO_SIZE_EBZIP_HEADER 22
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/*
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* Margin size for ebzip compression buffer.
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* (Since compressed data is larger than original in the worst case,
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* we must add margin to a compression buffer.)
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*/
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#define ZIO_SIZE_EBZIP_MARGIN 1024
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/*
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* Maximum ebzio compression level.
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*/
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#define ZIO_MAX_EBZIP_LEVEL 5
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/*
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* Huffman node types.
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*/
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#define ZIO_HUFFMAN_NODE_INTERMEDIATE 0
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#define ZIO_HUFFMAN_NODE_EOF 1
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#define ZIO_HUFFMAN_NODE_LEAF8 2
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#define ZIO_HUFFMAN_NODE_LEAF16 3
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#define ZIO_HUFFMAN_NODE_LEAF32 4
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/*
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* Compression type codes.
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*/
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#define ZIO_PLAIN 0
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#define ZIO_EBZIP1 1
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#define ZIO_EPWING 2
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#define ZIO_EPWING6 3
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#define ZIO_SEBXA 4
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#define ZIO_INVALID -1
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#define ZIO_REOPEN -2
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/*
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* Compression type.
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*/
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typedef int Zio_Code;
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/*
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* A node of static Huffman tree.
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*/
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typedef struct Zio_Huffman_Node_Struct Zio_Huffman_Node;
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struct Zio_Huffman_Node_Struct {
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/*
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* node type (ITNERMEDIATE, LEAF8, LEAF16, LEAF32 or EOF).
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*/
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int type;
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/*
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* Value of a leaf node.
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*/
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unsigned int value;
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/*
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* Frequency of a node.
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*/
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int frequency;
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/*
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* Left child.
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*/
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Zio_Huffman_Node *left;
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/*
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* Right child.
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*/
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Zio_Huffman_Node *right;
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};
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/*
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* Compression information of a book.
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*/
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typedef struct Zio_Struct Zio;
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struct Zio_Struct {
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/*
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* ID.
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*/
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int id;
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/*
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* Zio type. (PLAIN, EBZIP, EPWING, EPWING6 or SEBXA)
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*/
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Zio_Code code;
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/*
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* File descriptor.
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*/
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int file;
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/*
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* Current location.
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*/
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off_t location;
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/*
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* Size of an uncompressed file.
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*/
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off_t file_size;
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/*
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* Slice size of an EBZIP compressed file.
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*/
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size_t slice_size;
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/*
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* Compression level. (EBZIP compression only)
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*/
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int zip_level;
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/*
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* Length of an index. (EBZIP compression only)
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*/
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int index_width;
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/*
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* Adler-32 check sum of an uncompressed file. (EBZIP compression only)
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*/
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unsigned int crc;
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/*
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* mtime of an uncompressed file. (EBZIP compression only)
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*/
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time_t mtime;
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/*
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* Location of an index table. (EPWING and S-EBXA compression only)
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*/
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off_t index_location;
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/*
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* Length of an index table. (EPWING and S-EBXA compression only)
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*/
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size_t index_length;
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/*
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* Location of a frequency table. (EPWING compression only)
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*/
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off_t frequencies_location;
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/*
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* Length of a frequency table. (EPWING compression only)
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*/
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size_t frequencies_length;
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/*
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* Huffman tree nodes. (EPWING compression only)
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*/
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Zio_Huffman_Node *huffman_nodes;
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/*
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* Root node of a Huffman tree. (EPWING compression only)
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*/
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Zio_Huffman_Node *huffman_root;
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/*
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* Region of compressed pages. (S-EBXA compression only)
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*/
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off_t zio_start_location;
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off_t zio_end_location;
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/*
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* Add this value to offset written in index. (S-EBXA compression only)
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*/
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off_t index_base;
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/*
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* ebnet mode flag.
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*/
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int is_ebnet;
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};
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/*
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* Function declarations.
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*/
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/* zio.c */
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int zio_initialize_library(void);
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void zio_finalize_library(void);
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void zio_initialize(Zio *zio);
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void zio_finalize(Zio *zio);
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int zio_set_sebxa_mode(Zio *zio, off_t index_location, off_t index_base,
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off_t zio_start_location, off_t zio_end_location);
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int zio_open(Zio *zio, const char *file_name, Zio_Code zio_code);
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void zio_close(Zio *zio);
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int zio_file(Zio *zio);
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Zio_Code zio_mode(Zio *zio);
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off_t zio_lseek(Zio *zio, off_t offset, int whence);
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ssize_t zio_read(Zio *zio, char *buffer, size_t length);
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#ifdef __cplusplus
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}
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#endif
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#endif /* not ZIO_H */
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