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