sdcv/src/dictziplib.hpp

#pragma once

#include <ctime>
#include <string>
#include <zlib.h>

#include "mapfile.hpp"

struct DictCache {
    int chunk;
    char *inBuffer;
    int stamp;
    int count;
};

class DictData
{
public:
    static const size_t DICT_CACHE_SIZE = 5;

    DictData() {}
    ~DictData() { close(); }
    bool open(const std::string &filename, int computeCRC);
    void close();
    void read(char *buffer, unsigned long start, unsigned long size);

private:
    const char *start; /* start of mmap'd area */
    const char *end; /* end of mmap'd area */
    off_t size; /* size of mmap */

    int type;
    z_stream zStream;
    int initialized;

    int headerLength;
    int method;
    int flags;
    time_t mtime;
    int extraFlags;
    int os;
    int version;
    int chunkLength;
    int chunkCount;
    int *chunks;
    unsigned long *offsets; /* Sum-scan of chunks. */
    std::string origFilename;
    std::string comment;
    unsigned long crc;
    off_t length;
    unsigned long compressedLength;
    DictCache cache[DICT_CACHE_SIZE];
    MapFile mapfile;

    int read_header(const std::string &filename, int computeCRC);
};