file_access_compressed.h

/*************************************************************************/
/*  file_access_compressed.h                                             */
/*************************************************************************/
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
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#ifndef FILE_ACCESS_COMPRESSED_H
#define FILE_ACCESS_COMPRESSED_H

#include "io/compression.h"
#include "os/file_access.h"

class FileAccessCompressed : public FileAccess {

    Compression::Mode cmode;
    bool writing;
    int write_pos;
    uint8_t*write_ptr;
    int write_buffer_size;
    int write_max;
    int block_size;
    mutable bool read_eof;
    mutable bool at_end;

    struct ReadBlock {
        int csize;
        int offset;
    };

    mutable Vector<uint8_t> comp_buffer;
    uint8_t *read_ptr;
    mutable int read_block;
    int read_block_count;
    mutable int read_block_size;
    mutable int read_pos;
    Vector<ReadBlock> read_blocks;
    int read_total;




    String magic;
    mutable Vector<uint8_t> buffer;
    FileAccess *f;
public:

    void configure(const String& p_magic, Compression::Mode p_mode=Compression::MODE_FASTLZ, int p_block_size=4096);

    Error open_after_magic(FileAccess *p_base);

    virtual Error _open(const String& p_path, int p_mode_flags); 
    virtual void close(); 
    virtual bool is_open() const; 

    virtual void seek(size_t p_position); 
    virtual void seek_end(int64_t p_position=0); 
    virtual size_t get_pos() const; 
    virtual size_t get_len() const; 

    virtual bool eof_reached() const; 

    virtual uint8_t get_8() const; 
    virtual int get_buffer(uint8_t *p_dst, int p_length) const;

    virtual Error get_error() const; 

    virtual void store_8(uint8_t p_dest); 

    virtual bool file_exists(const String& p_name); 

    virtual uint64_t _get_modified_time(const String& p_file);


    FileAccessCompressed();
    virtual ~FileAccessCompressed();

};

#endif // FILE_ACCESS_COMPRESSED_H