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82 lines
1.3 KiB
C
82 lines
1.3 KiB
C
/*
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* The Python Imaging Library.
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* $Id$
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*
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* decoder for XBM hex image data
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*
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* history:
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* 96-04-13 fl Created
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*
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* Copyright (c) Fredrik Lundh 1996.
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* Copyright (c) Secret Labs AB 1997.
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*
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* See the README file for information on usage and redistribution.
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*/
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#include "Imaging.h"
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#define HEX(v) ((v >= '0' && v <= '9') ? v - '0' :\
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(v >= 'a' && v <= 'f') ? v - 'a' + 10 :\
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(v >= 'A' && v <= 'F') ? v - 'A' + 10 : 0)
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int
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ImagingXbmDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
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{
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enum { BYTE = 1, SKIP };
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UINT8* ptr;
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if (!state->state)
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state->state = SKIP;
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ptr = buf;
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for (;;) {
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if (state->state == SKIP) {
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/* Skip forward until next 'x' */
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while (bytes > 0) {
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if (*ptr == 'x')
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break;
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ptr++;
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bytes--;
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}
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if (bytes == 0)
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return ptr - buf;
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state->state = BYTE;
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}
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if (bytes < 3)
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return ptr - buf;
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state->buffer[state->x] = (HEX(ptr[1])<<4) + HEX(ptr[2]);
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if (++state->x >= state->bytes) {
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/* Got a full line, unpack it */
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state->shuffle((UINT8*) im->image[state->y], state->buffer,
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state->xsize);
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state->x = 0;
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if (++state->y >= state->ysize) {
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/* End of file (errcode = 0) */
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return -1;
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}
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}
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ptr += 3;
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bytes -= 3;
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state->state = SKIP;
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}
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}
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