mirror of
https://github.com/python-pillow/Pillow.git
synced 2025-11-04 01:47:47 +03:00
85 lines
1.6 KiB
C
85 lines
1.6 KiB
C
/*
|
|
* The Python Imaging Library.
|
|
* $Id$
|
|
*
|
|
* decoder for PCX image data.
|
|
*
|
|
* history:
|
|
* 95-09-14 fl Created
|
|
*
|
|
* Copyright (c) Fredrik Lundh 1995.
|
|
* Copyright (c) Secret Labs AB 1997.
|
|
*
|
|
* See the README file for information on usage and redistribution.
|
|
*/
|
|
|
|
|
|
#include "Imaging.h"
|
|
|
|
int
|
|
ImagingPcxDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
|
|
{
|
|
UINT8 n;
|
|
UINT8* ptr;
|
|
|
|
ptr = buf;
|
|
|
|
for (;;) {
|
|
|
|
if (bytes < 1)
|
|
return ptr - buf;
|
|
|
|
if ((*ptr & 0xC0) == 0xC0) {
|
|
|
|
/* Run */
|
|
if (bytes < 2)
|
|
return ptr - buf;
|
|
|
|
n = ptr[0] & 0x3F;
|
|
|
|
while (n > 0) {
|
|
if (state->x >= state->bytes) {
|
|
state->errcode = IMAGING_CODEC_OVERRUN;
|
|
break;
|
|
}
|
|
state->buffer[state->x++] = ptr[1];
|
|
n--;
|
|
}
|
|
|
|
ptr += 2; bytes -= 2;
|
|
|
|
} else {
|
|
|
|
/* Literal */
|
|
state->buffer[state->x++] = ptr[0];
|
|
ptr++; bytes--;
|
|
|
|
}
|
|
|
|
if (state->x >= state->bytes) {
|
|
if (state->bytes % state->xsize && state->bytes > state->xsize) {
|
|
int bands = state->bytes / state->xsize;
|
|
int stride = state->bytes / bands;
|
|
int i;
|
|
for (i=1; i< bands; i++) { // note -- skipping first band
|
|
memmove(&state->buffer[i*state->xsize],
|
|
&state->buffer[i*stride],
|
|
state->xsize);
|
|
}
|
|
}
|
|
/* Got a full line, unpack it */
|
|
state->shuffle((UINT8*) im->image[state->y + state->yoff] +
|
|
state->xoff * im->pixelsize, state->buffer,
|
|
state->xsize);
|
|
|
|
state->x = 0;
|
|
|
|
if (++state->y >= state->ysize) {
|
|
/* End of file (errcode = 0) */
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|