64 lines
1.2 KiB
C
64 lines
1.2 KiB
C
unsigned char TIFFFax2DMode[20][256];
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unsigned char TIFFFax2DNextState[20][256];
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unsigned char TIFFFaxUncompAction[20][256];
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unsigned char TIFFFaxUncompNextState[20][256];
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unsigned char TIFFFax1DAction[230][256];
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unsigned char TIFFFax1DNextState[230][256];
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typedef struct tableentry {
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unsigned short length;
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unsigned short code;
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short runlen;
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} tableentry;
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extern tableentry TIFFFaxWhiteCodes[];
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extern tableentry TIFFFaxBlackCodes[];
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static short sp_data, sp_bit;
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static unsigned char
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fetchByte (inbuf)
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unsigned char **inbuf;
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{
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unsigned char byte = **inbuf;
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(*inbuf)++;
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return (byte);
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}
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static int
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decode_white_run (inbuf)
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unsigned char **inbuf;
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{
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short state = sp_bit;
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short action;
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int runlen = 0;
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for (;;)
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{
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if (sp_bit == 0)
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{
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nextbyte:
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sp_data = fetchByte (inbuf);
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}
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action = TIFFFax1DAction[state][sp_data];
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state = TIFFFax1DNextState[state][sp_data];
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if (action == 0 )
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goto nextbyte;
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if (action == 1 )
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return (-1 );
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if (action == 210 )
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return (-3 );
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sp_bit = state;
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action = (TIFFFaxWhiteCodes[ action - 2 ].runlen) ;
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runlen += action;
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if (action < 64)
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return (runlen);
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}
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}
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