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/*
* The Python Imaging Library.
* $Id$
*
* decoder for raw (uncompressed) image data
*
* history:
* 96-03-07 fl rewritten
*
* Copyright (c) Fredrik Lundh 1996.
* Copyright (c) Secret Labs AB 1997.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
#include "Raw.h"
int
ImagingRawDecode(Imaging im, ImagingCodecState state, UINT8 *buf, Py_ssize_t bytes) {
enum { LINE = 1, SKIP };
RAWSTATE *rawstate = state->context;
UINT8 *ptr;
if (state->state == 0) {
/* Initialize context variables */
/* get size of image data and padding */
state->bytes = (state->xsize * state->bits + 7) / 8;
if (rawstate->stride) {
rawstate->skip = rawstate->stride - state->bytes;
if (rawstate->skip < 0) {
state->errcode = IMAGING_CODEC_CONFIG;
return -1;
}
} else {
rawstate->skip = 0;
}
/* check image orientation */
if (state->ystep < 0) {
state->y = state->ysize - 1;
state->ystep = -1;
} else {
state->ystep = 1;
}
state->state = LINE;
}
ptr = buf;
for (;;) {
if (state->state == SKIP) {
/* Skip padding between lines */
if (bytes < rawstate->skip) {
return ptr - buf;
}
ptr += rawstate->skip;
bytes -= rawstate->skip;
state->state = LINE;
}
if (bytes < state->bytes) {
return ptr - buf;
}
/* Unpack data */
state->shuffle(
(UINT8 *)im->image[state->y + state->yoff] + state->xoff * im->pixelsize,
ptr,
state->xsize);
ptr += state->bytes;
bytes -= state->bytes;
state->y += state->ystep;
if (state->y < 0 || state->y >= state->ysize) {
/* End of file (errcode = 0) */
return -1;
}
state->state = SKIP;
}
}
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