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/*
* The Python Imaging Library.
* $Id: TgaRleDecode.c 2134 2004-10-06 08:55:20Z fredrik $
*
* decoder for Targa RLE data.
*
* history:
* 97-01-04 fl created
* 98-09-11 fl don't one byte per pixel; take orientation into account
*
* Copyright (c) Fredrik Lundh 1997.
* Copyright (c) Secret Labs AB 1997-98.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
int
ImagingTgaRleDecode(Imaging im, ImagingCodecState state,
UINT8* buf, int bytes)
{
int n, depth;
UINT8* ptr;
ptr = buf;
if (state->state == 0) {
/* check image orientation */
if (state->ystep < 0) {
state->y = state->ysize-1;
state->ystep = -1;
} else
state->ystep = 1;
state->state = 1;
}
depth = state->count;
for (;;) {
if (bytes < 1)
return ptr - buf;
if (ptr[0] & 0x80) {
/* Run (1 + pixelsize bytes) */
if (bytes < 1 + depth)
break;
n = depth * ((ptr[0] & 0x7f) + 1);
if (state->x + n > state->bytes) {
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
if (depth == 1)
memset(state->buffer + state->x, ptr[1], n);
else {
int i;
for (i = 0; i < n; i += depth)
memcpy(state->buffer + state->x + i, ptr+1, depth);
}
ptr += 1 + depth;
bytes -= 1 + depth;
} else {
/* Literal (1+n+1 bytes block) */
n = depth * (ptr[0] + 1);
if (bytes < 1 + n)
break;
if (state->x + n > state->bytes) {
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;
state->y += state->ystep;
if (state->y < 0 || state->y >= state->ysize) {
/* End of file (errcode = 0) */
return -1;
}
}
}
return ptr - buf;
}
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