blob: 3226cd6ad037f6ae46e981ef9714186f5391d23a (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
#ifndef __PL_LZWDECODER_HH__
#define __PL_LZWDECODER_HH__
#include <qpdf/Pipeline.hh>
#include <qpdf/Buffer.hh>
#include <vector>
class Pl_LZWDecoder: public Pipeline
{
public:
DLL_EXPORT
Pl_LZWDecoder(char const* identifier, Pipeline* next,
bool early_code_change);
DLL_EXPORT
virtual ~Pl_LZWDecoder();
DLL_EXPORT
virtual void write(unsigned char* buf, int len);
DLL_EXPORT
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__
|