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92 lines
1.4 KiB
C
92 lines
1.4 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 MSP version 2 data.
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*
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* history:
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* 97-01-03 fl Created
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*
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* Copyright (c) Fredrik Lundh 1997.
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* Copyright (c) Secret Labs AB 1997.
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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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ImagingMspDecode(Imaging im, ImagingCodecState state, UINT8* buf, int bytes)
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{
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int n;
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UINT8* ptr;
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ptr = buf;
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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] == 0) {
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/* Run (3 bytes block) */
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if (bytes < 3)
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break;
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n = ptr[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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memset(state->buffer + state->x, ptr[2], n);
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ptr += 3;
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bytes -= 3;
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} else {
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/* Literal (1+n bytes block) */
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n = ptr[0];
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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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if (++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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