mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-11-14 05:36:48 +03:00
82 lines
1.3 KiB
C
82 lines
1.3 KiB
C
/*
|
|
* The Python Imaging Library.
|
|
* $Id$
|
|
*
|
|
* 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;
|
|
|
|
}
|
|
|
|
}
|