/* -*- C -*- * Copyright (c) 2001-2006 Motoyuki Kasahara * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef ZIO_H #define ZIO_H #ifdef __cplusplus extern "C" { #endif #include <sys/types.h> #include <time.h> /* * 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; /* * ebnet mode flag. */ int is_ebnet; }; /* * Function declarations. */ /* zio.c */ int zio_initialize_library(void); void zio_finalize_library(void); void zio_initialize(Zio *zio); void zio_finalize(Zio *zio); int zio_set_sebxa_mode(Zio *zio, off_t index_location, off_t index_base, off_t zio_start_location, off_t zio_end_location); int zio_open(Zio *zio, const char *file_name, Zio_Code zio_code); void zio_close(Zio *zio); int zio_file(Zio *zio); Zio_Code zio_mode(Zio *zio); off_t zio_lseek(Zio *zio, off_t offset, int whence); ssize_t zio_read(Zio *zio, char *buffer, size_t length); #ifdef __cplusplus } #endif #endif /* not ZIO_H */