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/*
* THIS IS WORK IN PROGRESS
*
* The Python Imaging Library.
* $Id$
*
* decoder for SUN RLE data.
*
* history:
* 97-01-04 fl Created
*
* Copyright (c) Fredrik Lundh 1997.
* Copyright (c) Secret Labs AB 1997.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
int
ImagingSunRleDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
{
int n;
UINT8* ptr;
ptr = buf;
for (;;) {
if (bytes < 1)
return ptr - buf;
if (ptr[0] == 0x80) {
if (bytes < 2)
break;
n = ptr[1];
if (n == 0) {
/* Literal 0x80 (2 bytes) */
n = 1;
state->buffer[state->x] = 0x80;
ptr += 2;
bytes -= 2;
} else {
/* Run (3 bytes) */
if (bytes < 3)
break;
if (state->x + n > state->bytes) {
/* FIXME: is this correct? */
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
memset(state->buffer + state->x, ptr[2], n);
ptr += 3;
bytes -= 3;
}
} else {
/* Literal (1+n bytes block) */
n = ptr[0];
if (bytes < 1 + n)
break;
if (state->x + n > state->bytes) {
/* FIXME: is this correct? */
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
memcpy(state->buffer + state->x, ptr + 1, n);
ptr += 1 + n;
bytes -= 1 + n;
}
state->x += n;
if (state->x >= state->bytes) {
/* 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;
}
}
}
return ptr - buf;
}
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