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5d4cad9c02
Significantly improve the code's use of off_t for file offsets, size_t for memory sizes, and integer types in cases where there has to be compatibility with external interfaces. Rework sections of the code that would have prevented qpdf from working on files larger than 2 (or maybe 4) GB in size.
44 lines
958 B
C++
44 lines
958 B
C++
#ifndef __PL_LZWDECODER_HH__
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#define __PL_LZWDECODER_HH__
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#include <qpdf/Pipeline.hh>
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#include <qpdf/Buffer.hh>
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#include <vector>
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class Pl_LZWDecoder: public Pipeline
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{
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public:
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QPDF_DLL
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Pl_LZWDecoder(char const* identifier, Pipeline* next,
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bool early_code_change);
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QPDF_DLL
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virtual ~Pl_LZWDecoder();
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QPDF_DLL
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virtual void write(unsigned char* buf, size_t len);
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QPDF_DLL
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virtual void finish();
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private:
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void sendNextCode();
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void handleCode(int code);
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unsigned char getFirstChar(int code);
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void addToTable(unsigned char next);
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// members used for converting bits to codes
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unsigned char buf[3];
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int code_size;
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int next;
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int byte_pos;
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int bit_pos; // left to right: 01234567
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int bits_available;
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// members used for handle LZW decompression
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bool code_change_delta;
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bool eod;
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std::vector<Buffer> table;
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int last_code;
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};
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#endif // __PL_LZWDECODER_HH__
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