gzip.h

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#ifndef GZIP_H
#define GZIP_H

#include "zdeflate.h"
#include "zinflate.h"
#include "crc.h"

class Gzip : public Deflator
{
public:
    Gzip(int deflate_level, BufferedTransformation *bt=new ByteQueue);

    void Put(byte inByte);
    void Put(const byte *inString, unsigned int length);
    void InputFinished();

protected:
    enum {MAGIC1=0x1f, MAGIC2=0x8b,   // flags for the header
          DEFLATED=8, FAST=4, SLOW=2};

    unsigned long totalLen;
    CRC32 crc;
};

class Gunzip : public Fork
{
public:
    class Err {};
    class CrcErr : public Err {};
    class LengthErr : public Err{};

    Gunzip(BufferedTransformation *output=new ByteQueue,
           BufferedTransformation *bypassed=new BitBucket);

    void Put(byte inByte) {Put(&inByte, 1);}
    void Put(const byte *inString, unsigned int length);
    void InputFinished();

protected:
    enum {MAGIC1=0x1f, MAGIC2=0x8b,   // flags for the header
          DEFLATED=8,
          MAX_HEADERSIZE=1024};

    enum FLAG_MASKS {
        CONTINUED=2, EXTRA_FIELDS=4, FILENAME=8, COMMENTS=16, ENCRYPTED=32};

    class BodyProcesser : public Sink
    {
    public:
        BodyProcesser(Gunzip &parent);
        void Put(byte inByte) {Put(&inByte, 1);}
        void Put(const byte *inString, unsigned int length);
    private:
        Gunzip &parent;
    };

    class TailProcesser : public Sink
    {
    public:
        TailProcesser(Gunzip &parent);
        void Put(byte inByte) {Put(&inByte, 1);}
        void Put(const byte *inString, unsigned int length);
    private:
        Gunzip &parent;
    };

    friend BodyProcesser;
    friend TailProcesser;

    void ProcessHeader();
    void ProcessTail();

    Inflator inflater;
    ByteQueue inQueue;

    unsigned long totalLen;
    CRC32 crc;

    byte tail[8];
    unsigned int tailLen;

    enum State {PROCESS_HEADER, PROCESS_BODY, AFTER_END};
    State state;
};

#endif