update release date to actual daterelease-qpdf-2.0

git-svn-id: svn+q:///qpdf/trunk@599 71b93d88-0707-0410-a8cf-f5a4172ac649

1 files changed, 40 insertions, 0 deletions

diff --git a/libqpdf/qpdf/Pl_LZWDecoder.hh b/libqpdf/qpdf/Pl_LZWDecoder.hh
new file mode 100644
index 00000000..95ec55b3
--- /dev/null
+++ b/libqpdf/qpdf/Pl_LZWDecoder.hh
@@ -0,0 +1,40 @@
+
+#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__