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#ifndef __PL_LZWDECODER_HH__
#define __PL_LZWDECODER_HH__
#include <qpdf/Pipeline.hh>
#include <qpdf/Buffer.hh>
#include <vector>
class Pl_LZWDecoder: public Pipeline
{
public:
Pl_LZWDecoder(char const* identifier, Pipeline* next,
bool early_code_change);
virtual ~Pl_LZWDecoder();
virtual void write(unsigned char* buf, int len);
virtual void finish();
private:
void sendNextCode();
void handleCode(int code);
unsigned char getFirstChar(int code);
void addToTable(unsigned char next);
// members used for converting bits to codes
unsigned char buf[3];
int code_size;
int next;
int byte_pos;
int bit_pos; // left to right: 01234567
int bits_available;
// members used for handle LZW decompression
bool code_change_delta;
bool eod;
std::vector<Buffer> table;
int last_code;
};
#endif // __PL_LZWDECODER_HH__
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