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/*
* The Python Imaging Library.
* $Id: XbmDecode.c 2134 2004-10-06 08:55:20Z fredrik $
*
* decoder for XBM hex image data
*
* history:
* 96-04-13 fl Created
*
* Copyright (c) Fredrik Lundh 1996.
* Copyright (c) Secret Labs AB 1997.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
#define HEX(v) ((v >= '0' && v <= '9') ? v - '0' :\
(v >= 'a' && v <= 'f') ? v - 'a' + 10 :\
(v >= 'A' && v <= 'F') ? v - 'A' + 10 : 0)
int
ImagingXbmDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
{
enum { BYTE = 1, SKIP };
UINT8* ptr;
if (!state->state)
state->state = SKIP;
ptr = buf;
for (;;) {
if (state->state == SKIP) {
/* Skip forward until next 'x' */
while (bytes > 0) {
if (*ptr == 'x')
break;
ptr++;
bytes--;
}
if (bytes == 0)
return ptr - buf;
state->state = BYTE;
}
if (bytes < 3)
return ptr - buf;
state->buffer[state->x] = (HEX(ptr[1])<<4) + HEX(ptr[2]);
if (++state->x >= state->bytes) {
/* Got a full line, unpack it */
state->shuffle((UINT8*) im->image[state->y], state->buffer,
state->xsize);
state->x = 0;
if (++state->y >= state->ysize) {
/* End of file (errcode = 0) */
return -1;
}
}
ptr += 3;
bytes -= 3;
state->state = SKIP;
}
}
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