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/*
* The Python Imaging Library.
* $Id$
*
* decoder for Autodesk Animator FLI/FLC animations
*
* history:
* 97-01-03 fl Created
* 97-01-17 fl Added SS2 support (FLC)
*
* Copyright (c) Fredrik Lundh 1997.
* Copyright (c) Secret Labs AB 1997.
*
* See the README file for information on usage and redistribution.
*/
#include "Imaging.h"
#define I16(ptr)\
((ptr)[0] + ((ptr)[1] << 8))
#define I32(ptr)\
((ptr)[0] + ((ptr)[1] << 8) + ((ptr)[2] << 16) + ((ptr)[3] << 24))
int
ImagingFliDecode(Imaging im, ImagingCodecState state, UINT8* buf, Py_ssize_t bytes)
{
UINT8* ptr;
int framesize;
int c, chunks, advance;
int l, lines;
int i, j, x = 0, y, ymax;
/* If not even the chunk size is present, we'd better leave */
if (bytes < 4)
return 0;
/* We don't decode anything unless we have a full chunk in the
input buffer */
ptr = buf;
framesize = I32(ptr);
if (framesize < I32(ptr))
return 0;
/* Make sure this is a frame chunk. The Python driver takes
case of other chunk types. */
if (bytes < 8) {
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
if (I16(ptr+4) != 0xF1FA) {
state->errcode = IMAGING_CODEC_UNKNOWN;
return -1;
}
chunks = I16(ptr+6);
ptr += 16;
bytes -= 16;
/* Process subchunks */
for (c = 0; c < chunks; c++) {
UINT8* data;
if (bytes < 10) {
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
data = ptr + 6;
switch (I16(ptr+4)) {
case 4: case 11:
/* FLI COLOR chunk */
break; /* ignored; handled by Python code */
case 7:
/* FLI SS2 chunk (word delta) */
lines = I16(data); data += 2;
for (l = y = 0; l < lines && y < state->ysize; l++, y++) {
UINT8* buf = (UINT8*) im->image[y];
int p, packets;
packets = I16(data); data += 2;
while (packets & 0x8000) {
/* flag word */
if (packets & 0x4000) {
y += 65536 - packets; /* skip lines */
if (y >= state->ysize) {
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
buf = (UINT8*) im->image[y];
} else {
/* store last byte (used if line width is odd) */
buf[state->xsize-1] = (UINT8) packets;
}
packets = I16(data); data += 2;
}
for (p = x = 0; p < packets; p++) {
x += data[0]; /* pixel skip */
if (data[1] >= 128) {
i = 256-data[1]; /* run */
if (x + i + i > state->xsize)
break;
for (j = 0; j < i; j++) {
buf[x++] = data[2];
buf[x++] = data[3];
}
data += 2 + 2;
} else {
i = 2 * (int) data[1]; /* chunk */
if (x + i > state->xsize)
break;
memcpy(buf + x, data + 2, i);
data += 2 + i;
x += i;
}
}
if (p < packets)
break; /* didn't process all packets */
}
if (l < lines) {
/* didn't process all lines */
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
break;
case 12:
/* FLI LC chunk (byte delta) */
y = I16(data); ymax = y + I16(data+2); data += 4;
for (; y < ymax && y < state->ysize; y++) {
UINT8* out = (UINT8*) im->image[y];
int p, packets = *data++;
for (p = x = 0; p < packets; p++, x += i) {
x += data[0]; /* skip pixels */
if (data[1] & 0x80) {
i = 256-data[1]; /* run */
if (x + i > state->xsize)
break;
memset(out + x, data[2], i);
data += 3;
} else {
i = data[1]; /* chunk */
if (x + i > state->xsize)
break;
memcpy(out + x, data + 2, i);
data += i + 2;
}
}
if (p < packets)
break; /* didn't process all packets */
}
if (y < ymax) {
/* didn't process all lines */
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
break;
case 13:
/* FLI BLACK chunk */
for (y = 0; y < state->ysize; y++)
memset(im->image[y], 0, state->xsize);
break;
case 15:
/* FLI BRUN chunk */
for (y = 0; y < state->ysize; y++) {
UINT8* out = (UINT8*) im->image[y];
data += 1; /* ignore packetcount byte */
for (x = 0; x < state->xsize; x += i) {
if (data[0] & 0x80) {
i = 256 - data[0];
if (x + i > state->xsize)
break; /* safety first */
memcpy(out + x, data + 1, i);
data += i + 1;
} else {
i = data[0];
if (x + i > state->xsize)
break; /* safety first */
memset(out + x, data[1], i);
data += 2;
}
}
if (x != state->xsize) {
/* didn't unpack whole line */
state->errcode = IMAGING_CODEC_OVERRUN;
return -1;
}
}
break;
case 16:
/* COPY chunk */
for (y = 0; y < state->ysize; y++) {
UINT8* buf = (UINT8*) im->image[y];
memcpy(buf, data, state->xsize);
data += state->xsize;
}
break;
case 18:
/* PSTAMP chunk */
break; /* ignored */
default:
/* unknown chunk */
/* printf("unknown FLI/FLC chunk: %d\n", I16(ptr+4)); */
state->errcode = IMAGING_CODEC_UNKNOWN;
return -1;
}
advance = I32(ptr);
ptr += advance;
bytes -= advance;
}
return -1; /* end of frame */
}
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