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swfextract.c
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/* swfextract.c
Allows to extract parts of the swf into a new file.
Part of the swftools package.
Copyright (c) 2001 Matthias Kramm <kramm@quiss.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include "../lib/rfxswf.h"
#include "../lib/args.h"
#include "../lib/log.h"
#include "../lib/jpeg.h"
#include "../lib/png.h"
#ifdef HAVE_ZLIB_H
#ifdef HAVE_LIBZ
#include "zlib.h"
#define _ZLIB_INCLUDED_
#endif
#endif
char * filename = 0;
char * destfilename = "output.swf";
int verbose = 3;
char* extractids = 0;
char* extractframes = 0;
char* extractjpegids = 0;
char* extractfontids = 0;
char* extractpngids = 0;
char* extractsoundids = 0;
char* extractmp3ids = 0;
char* extractbinaryids = 0;
char* extractanyids = 0;
char extractmp3 = 0;
char* extractname = 0;
char hollow = 0;
char originalplaceobjects = 0;
char movetozero = 0;
int numextracts = 0;
char *outputformat = NULL;
struct options_t options[] =
{
{"o","output"},
{"w","hollow"},
{"v","verbose"},
{"i","id"},
{"j","jpegs"},
{"p","pngs"},
{"a","any"},
{"P","placeobject"},
{"0","movetozero"},
{"m","mp3"},
{"M","embeddedmp3"},
{"s","sound"},
{"n","name"},
{"f","frame"},
{"F","font"},
{"V","version"},
{"b","binary"},
{"O","outputformat"},
{0,0}
};
int args_callback_option(char*name,char*val)
{
if(!strcmp(name, "V")) {
printf("swfextract - part of %s %s\n", PACKAGE, VERSION);
exit(0);
}
else if(!strcmp(name, "o")) {
destfilename = val;
return 1;
}
else if(!strcmp(name, "i")) {
extractids = val;
numextracts++;
if(extractname) {
fprintf(stderr, "You can only supply either name or id\n");
exit(1);
}
return 1;
}
else if(!strcmp(name, "n")) {
extractname = val;
numextracts++;
if(extractids) {
fprintf(stderr, "You can only supply either name or id\n");
exit(1);
}
return 1;
}
else if(!strcmp(name, "v")) {
verbose ++;
return 0;
}
else if(!strcmp(name, "m")) {
extractmp3 = 1;
numextracts++;
return 0;
}
else if(!strcmp(name, "M")) {
if(extractsoundids) {
fprintf(stderr, "Only one --embeddedmp3 argument is allowed. (Try to use a range, e.g. -M 1,2,3)\n");
exit(1);
}
numextracts++;
extractmp3ids = val;
return 1;
}
else if(!strcmp(name, "j")) {
if(extractjpegids) {
fprintf(stderr, "Only one --jpegs argument is allowed. (Try to use a range, e.g. -j 1,2,3)\n");
exit(1);
}
/* TODO: count number of IDs in val range */
numextracts++;
extractjpegids = val;
return 1;
}
else if(!strcmp(name, "F")) {
if(extractfontids) {
fprintf(stderr, "Only one --font argument is allowed. (Try to use a range, e.g. -s 1,2,3)\n");
exit(1);
}
numextracts++;
extractfontids = val;
return 1;
}
else if(!strcmp(name, "s")) {
if(extractsoundids) {
fprintf(stderr, "Only one --sound argument is allowed. (Try to use a range, e.g. -s 1,2,3)\n");
exit(1);
}
numextracts++;
extractsoundids = val;
return 1;
}
else if(!strcmp(name, "b")) {
if(extractbinaryids) {
fprintf(stderr, "Only one --binary argument is allowed. (Try to use a range, e.g. -s 1,2,3)\n");
exit(1);
}
numextracts++;
extractbinaryids = val;
return 1;
}
#ifdef _ZLIB_INCLUDED_
else if(!strcmp(name, "p")) {
if(extractpngids) {
fprintf(stderr, "Only one --png argument is allowed. (Try to use a range, e.g. -p 1,2,3)\n");
exit(1);
}
numextracts++;
extractpngids = val;
return 1;
}
#endif
else if(!strcmp(name, "a")) {
numextracts++;
extractanyids = val;
return 1;
}
else if(!strcmp(name, "f")) {
numextracts++;
extractframes = val;
return 1;
}
else if(!strcmp(name, "P")) {
originalplaceobjects = 1;
return 0;
}
else if(!strcmp(name, "0")) {
movetozero = 1;
return 0;
}
else if(!strcmp(name, "w")) {
hollow = 1;
return 0;
}
else if (!strcmp(name, "O")) {
outputformat = val;
return 1;
}
else {
printf("Unknown option: -%s\n", name);
exit(1);
}
return 0;
}
int args_callback_longoption(char*name,char*val)
{
return args_long2shortoption(options, name, val);
}
void args_callback_usage(char*name)
{
printf("Usage: %s [-v] [-n name] [-ijf ids] file.swf\n", name);
printf("\t-v , --verbose\t\t\t Be more verbose\n");
printf("\t-o , --output filename\t\t set output filename\n");
printf("\t-V , --version\t\t\t Print program version and exit\n\n");
printf("SWF Subelement extraction:\n");
printf("\t-n , --name name\t\t instance name of the object (SWF Define) to extract\n");
printf("\t-i , --id ID\t\t\t ID of the object, shape or movieclip to extract\n");
printf("\t-f , --frame frames\t\t frame numbers to extract\n");
printf("\t-w , --hollow\t\t\t hollow mode: don't remove empty frames\n");
printf("\t \t\t\t (use with -f)\n");
printf("\t-P , --placeobject\t\t\t Insert original placeobject into output file\n");
printf("\t \t\t\t (use with -i)\n");
printf("SWF Font/Text extraction:\n");
printf("\t-F , --font ID\t\t\t Extract font(s)\n");
printf("Picture extraction:\n");
printf("\t-j , --jpeg ID\t\t\t Extract JPEG picture(s)\n");
#ifdef _ZLIB_INCLUDED_
printf("\t-p , --pngs ID\t\t\t Extract PNG picture(s)\n");
#endif
printf("\n");
printf("Sound extraction:\n");
printf("\t-m , --mp3\t\t\t Extract main mp3 stream\n");
printf("\t-M , --embeddedmp3\t\t\t Extract embedded mp3 stream(s)\n");
printf("\t-s , --sound ID\t\t\t Extract Sound(s)\n");
}
int args_callback_command(char*name,char*val)
{
if(filename) {
fprintf(stderr, "Only one file allowed. You supplied at least two. (%s and %s)\n",
filename, name);
}
filename = name;
return 0;
}
void prepare_name(char *buf, size_t len, const char *prefix,
const char *suffix, int idx) {
if (outputformat!=NULL) {
// override default file name formatting
// make sure single-file behavior is not used
numextracts = -1;
// Other parts of codebase use vsnprintf, so I assume snprintf
// is available on all platforms that swftools currently works on.
// We need to check for buffer overflows now that the user is
// supplying the format string.
snprintf(buf,len,outputformat,idx,suffix);
} else {
// use default file name formatting, unchanged
sprintf(buf,"%s%d.%s",prefix,idx,suffix);
}
}
U8 mainr,maing,mainb;
/* 1 = used, not expanded,
3 = used, expanded
5 = wanted, not expanded
7 = wanted, expanded
*/
char used[65536];
TAG*tags[65536];
int changed;
char * tagused;
int extractname_id = -1;
void idcallback(void*data)
{
if(!(used[GET16(data)]&1)) {
changed = 1;
used[GET16(data)] |= 1;
}
}
void enumerateIDs(TAG*tag, void(*callback)(void*))
{
/* U8*data;
int len = tag->len;
if(tag->len>=64) {
len += 6;
data = (U8*)malloc(len);
PUT16(data, (tag->id<<6)+63);
*(U8*)&data[2] = tag->len;
*(U8*)&data[3] = tag->len>>8;
*(U8*)&data[4] = tag->len>>16;
*(U8*)&data[5] = tag->len>>24;
memcpy(&data[6], tag->data, tag->len);
} else {
len += 2;
data = (U8*)malloc(len);
PUT16(data, (tag->id<<6)+tag->len);
memcpy(&data[2], tag->data, tag->len);
}
map_ids_mem(data, len, callback);
*/
int num = swf_GetNumUsedIDs(tag);
int *ptr = malloc(sizeof(int)*num);
int t;
swf_GetUsedIDs(tag, ptr);
for(t=0;t<num;t++)
callback(&tag->data[ptr[t]]);
}
void moveToZero(TAG*tag)
{
if(!swf_isPlaceTag(tag))
return;
SWFPLACEOBJECT obj;
swf_GetPlaceObject(tag, &obj);
obj.matrix.tx = 0;
obj.matrix.ty = 0;
swf_ResetTag(tag, tag->id);
swf_SetPlaceObject(tag, &obj);
}
void extractTag(SWF*swf, char*filename)
{
SWF newswf;
TAG*desttag;
TAG*srctag;
RGBA rgb;
SRECT objectbbox;
char sprite;
int f;
int t;
int tagnum;
int copy = 0;
memset(&newswf,0x00,sizeof(SWF)); // set global movie parameters
newswf.fileVersion = swf->fileVersion;
newswf.frameRate = swf->frameRate;
newswf.movieSize = swf->movieSize;
if(movetozero && originalplaceobjects) {
newswf.movieSize.xmax = swf->movieSize.xmax - swf->movieSize.xmin;
newswf.movieSize.ymax = swf->movieSize.ymax - swf->movieSize.ymin;
newswf.movieSize.xmin = 0;
newswf.movieSize.ymin = 0;
}
newswf.firstTag = swf_InsertTag(NULL,ST_SETBACKGROUNDCOLOR);
desttag = newswf.firstTag;
rgb.r = mainr;
rgb.g = maing;
rgb.b = mainb;
swf_SetRGB(desttag,&rgb);
swf_GetRect(0, &objectbbox);
do {
changed = 0;
for(t=0;t<65536;t++) {
if(used[t] && !(used[t]&2)) {
if(tags[t]==0) {
msg("<warning> ID %d is referenced, but never defined.", t);
} else if(tags[t]->id==ST_DEFINESPRITE) {
TAG*tag = tags[t];
while(tag->id != ST_END)
{
enumerateIDs(tag, idcallback);
tag = tag->next;
}
}
else
enumerateIDs(tags[t], idcallback);
used[t] |= 2;
}
}
}
while(changed);
srctag = swf->firstTag;
tagnum = 0;
sprite = 0;
while(srctag && (srctag->id || sprite)) {
int reset = 0;
if(!sprite) {
copy = 0;
}
if(srctag->id == ST_END) {
sprite = 0;
}
if(srctag->id == ST_DEFINESPRITE)
sprite = 1;
if(srctag->id == ST_JPEGTABLES)
copy = 1;
if(swf_isDefiningTag(srctag)) {
int id = swf_GetDefineID(srctag);
if(used[id]) {
SRECT b;
copy = 1;
b = swf_GetDefineBBox(srctag);
swf_ExpandRect2(&objectbbox, &b);
}
} else
if ((((swf_isPlaceTag(srctag) && originalplaceobjects)
|| srctag->id == ST_STARTSOUND) && (used[swf_GetPlaceID(srctag)]&4) ) ||
(swf_isPseudoDefiningTag(srctag) && used[swf_GetDefineID(srctag)]) ||
(tagused[tagnum]))
{
if(copy == 0)
reset = 1;
copy = 1;
}
if(srctag->id == ST_REMOVEOBJECT) {
if(!used[swf_GetPlaceID(srctag)])
copy = 0;
}
if(copy) {
TAG*ttag = (TAG*)malloc(sizeof(TAG));
desttag = swf_InsertTag(desttag, srctag->id);
desttag->len = desttag->memsize = srctag->len;
desttag->data = malloc(srctag->len);
memcpy(desttag->data, srctag->data, srctag->len);
if(movetozero && swf_isPlaceTag(desttag)) {
moveToZero(desttag);
}
if(reset)
copy = 0;
}
srctag = srctag->next;
tagnum ++;
}
if(!extractframes && !hollow) {
if(!originalplaceobjects && (extractids||extractname_id>=0)) {
int number = 0;
int id = 0;
int t;
TAG* objtag = 0;
SRECT bbox;
memset(&bbox, 0, sizeof(SRECT));
if(extractids) {
for(t=0;t<65536;t++) {
if(is_in_range(t, extractids)) {
id = t;
number++;
}
}
}
if(number>=2) {
printf("warning! You should use the -P when extracting multiple objects\n");
}
if(number == 1) {
/* if there is only one object, we will scale it.
So let's figure out its bounding box */
TAG*tag = swf->firstTag;
while(tag) {
if(swf_isDefiningTag(tag) && tag->id != ST_DEFINESPRITE) {
if(swf_GetDefineID(tag) == id)
bbox = swf_GetDefineBBox(tag);
objtag = tag;
}
tag = tag->next;
}
newswf.movieSize.xmin = 0;
newswf.movieSize.ymin = 0;
newswf.movieSize.xmax = 512*20;
newswf.movieSize.ymax = 512*20;
} else {
if((objectbbox.xmin|objectbbox.ymin|objectbbox.xmax|objectbbox.ymax)!=0)
newswf.movieSize = objectbbox;
}
if(extractname_id>=0) {
desttag = swf_InsertTag(desttag, ST_PLACEOBJECT2);
swf_ObjectPlace(desttag, extractname_id, extractname_id, 0,0,extractname);
} else {
for(t=0;t<65536;t++) {
if(is_in_range(t, extractids)) {
MATRIX m;
desttag = swf_InsertTag(desttag, ST_PLACEOBJECT2);
swf_GetMatrix(0, &m);
if(objtag) {
int width = bbox.xmax - bbox.xmin;
int height = bbox.ymax - bbox.ymin;
int max = width>height?width:height;
m.tx = -bbox.xmin;
m.ty = -bbox.ymin;
if(max) {
m.sx = (512*20*65536)/max;
m.sy = (512*20*65536)/max;
}
//newswf.movieSize = swf_TurnRect(newswf.movieSize, &m);
}
swf_ObjectPlace(desttag, t, t, &m,0,0);
}
}
}
}
desttag = swf_InsertTag(desttag,ST_SHOWFRAME);
}
desttag = swf_InsertTag(desttag,ST_END);
f = open(filename, O_TRUNC|O_WRONLY|O_CREAT|O_BINARY, 0644);
if FAILED(swf_WriteSWF(f,&newswf)) fprintf(stderr,"WriteSWF() failed.\n");
close(f);
swf_FreeTags(&newswf); // cleanup
}
int isOfType(int t, TAG*tag)
{
int show = 0;
if(t == 0 && (tag->id == ST_DEFINESHAPE ||
tag->id == ST_DEFINESHAPE2 ||
tag->id == ST_DEFINESHAPE3)) {
show = 1;
}
if(t==1 && tag->id == ST_DEFINESPRITE) {
show = 1;
}
if(t == 2 && (tag->id == ST_DEFINEBITS ||
tag->id == ST_DEFINEBITSJPEG2 ||
tag->id == ST_DEFINEBITSJPEG3)) {
show = 1;
}
if(t == 3 && (tag->id == ST_DEFINEBITSLOSSLESS ||
tag->id == ST_DEFINEBITSLOSSLESS2)) {
show = 1;
}
if(t == 4 && (tag->id == ST_DEFINESOUND)) {
show = 1;
}
if(t == 5 && (tag->id == ST_DEFINEFONT || tag->id == ST_DEFINEFONT2 || tag->id == ST_DEFINEFONT3)) {
show = 1;
}
if (t== 6 && (tag->id == ST_DEFINEBINARY)) {
show = 1;
}
if (t== 7 && (tag->id == ST_DEFINESPRITE)) {
int wasFolded = swf_IsFolded(tag);
TAG *toFold = tag;
if(wasFolded)
swf_UnFoldSprite(tag);
while(tag->id != ST_END) {
tag = tag->next;
if(tag->id == ST_SOUNDSTREAMHEAD || tag->id == ST_SOUNDSTREAMHEAD2) {
show = 1;
break;
}
}
if(wasFolded)
swf_FoldSprite(toFold);
}
return show;
}
void listObjects(SWF*swf)
{
TAG*tag;
char first;
int t;
int frame = 0;
char*names[] = {"Shape", "MovieClip", "JPEG", "PNG", "Sound", "Font", "Binary", "Embedded MP3"};
char*options[] = {"-i", "-i", "-j", "-p", "-s", "-F","-b","-M"};
int mp3=0;
printf("Objects in file %s:\n",filename);
swf_FoldAll(swf);
for(t=0;t<sizeof(names)/sizeof(names[0]);t++) {
int nr=0;
int lastid = -2, lastprint=-1;
int follow=0;
tag = swf->firstTag;
first = 1;
while(tag) {
if(tag->id == ST_SOUNDSTREAMHEAD || tag->id == ST_SOUNDSTREAMHEAD2)
mp3 = 1;
if(isOfType(t,tag))
nr++;
tag = tag->next;
}
if(!nr)
continue;
printf(" [%s] %d %s%s: ID(s) ", options[t], nr, names[t], nr>1?"s":"");
tag = swf->firstTag;
while(tag) {
char text[80];
char show = isOfType(t,tag);
int id;
if(!show) {
tag = tag->next;
continue;
}
id = swf_GetDefineID(tag);
if(id == lastid+1) {
follow=1;
} else {
if(first || !follow) {
if(!first)
printf(", ");
printf("%d", id);
} else {
if(lastprint + 1 == lastid)
printf(", %d, %d", lastid, id);
else
printf("-%d, %d", lastid, id);
}
lastprint = id;
first = 0;
follow = 0;
}
lastid = id;
tag=tag->next;
}
if(follow) {
if(lastprint + 1 == lastid)
printf(", %d", lastid);
else
printf("-%d", lastid);
}
printf("\n");
}
if(frame)
printf(" [-f] %d Frames: ID(s) 0-%d\n", frame, frame);
else
printf(" [-f] 1 Frame: ID(s) 0\n");
if(mp3)
printf(" [-m] 1 MP3 Soundstream\n");
}
int handlefont(SWF*swf, TAG*tag)
{
SWFFONT* f=0;
U16 id;
char name[80];
char*filename = name;
int t;
id = swf_GetDefineID(tag);
prepare_name(name, sizeof(name), "font", "swf", id);
if(numextracts==1) {
filename = destfilename;
}
swf_FontExtract(swf, id, &f);
if(!f) {
if (!extractanyids) {
printf("Couldn't extract font %d\n", id);
}
return 0;
}
swf_WriteFont(f, filename);
swf_FontFree(f);
return 1;
}
static char has_jpegtables=0;
static U8*jpegtables = 0;
static int jpegtablessize = 0;
void handlejpegtables(TAG*tag)
{
if(tag->id == ST_JPEGTABLES) {
jpegtables = tag->data;
jpegtablessize = tag->len;
has_jpegtables = 1;
}
}
FILE* save_fopen(char* name, char* mode)
{
FILE*fi = fopen(name, mode);
if(!fi) {
fprintf(stderr, "Error: Couldn't open %s\n", name);
exit(1);
}
return fi;
}
int findjpegboundary(U8*data, int len)
{
int t;
int pos=-1;
for(t=0;t<len-4;t++) {
if(data[t ]==0xff &&
data[t+1]==0xd9 &&
data[t+2]==0xff &&
data[t+3]==0xd8) {
pos = t;
}
}
return pos;
}
/* extract jpeg data out of a tag */
int handlejpeg(TAG*tag)
{
char name[80];
char*filename = name;
FILE*fi;
if(tag->id != ST_DEFINEBITSJPEG3) {
prepare_name(name, sizeof(name), "pic", "jpg", GET16(tag->data));
if(numextracts==1) {
filename = destfilename;
if(!strcmp(filename,"output.swf"))
filename = "output.jpg";
}
} else {
prepare_name(name, sizeof(name), "pic", "png", GET16(tag->data));
if(numextracts==1) {
filename = destfilename;
if(!strcmp(filename,"output.swf"))
filename = "output.png";
}
}
/* swf jpeg images have two streams, which both start with ff d8 and
end with ff d9. The following code handles sorting the middle
<ff d9 ff d8> bytes out, so that one stream remains */
if(tag->id == ST_DEFINEBITSJPEG && tag->len>2 && has_jpegtables) {
fi = save_fopen(filename, "wb");
if(jpegtablessize>=2) {
fwrite(jpegtables, 1, jpegtablessize-2, fi); //don't write end tag (ff,d8)
fwrite(&tag->data[2+2], tag->len-2-2, 1, fi); //don't write start tag (ff,d9)
} else {
fwrite(tag->data+2, tag->len-2, 1, fi);
}
fclose(fi);
}
else if(tag->id == ST_DEFINEBITSJPEG2 && tag->len>2) {
int end = tag->len;
int pos = findjpegboundary(&tag->data[2], tag->len-2);
if(pos>=0) {
pos+=2;
fi = save_fopen(filename, "wb");
fwrite(&tag->data[2], pos-2, 1, fi);
fwrite(&tag->data[pos+4], end-(pos+4), 1, fi);
fclose(fi);
} else {
fi = save_fopen(filename, "wb");
fwrite(&tag->data[2], end-2, 1, fi);
fclose(fi);
}
}
else if(tag->id == ST_DEFINEBITSJPEG3 && tag->len>6) {
U32 end = GET32(&tag->data[2])+6;
int pos = findjpegboundary(&tag->data[6], end);
if(end >= tag->len) {
msg("<error> zlib data out of bounds in definebitsjpeg3");
return 0;
}
if(pos) {
/* TODO: do we actually need this? */
memmove(&tag->data[pos], &tag->data[pos+4], end-(pos+4));
}
unsigned char*image;
unsigned width=0, height=0;
jpeg_load_from_mem(&tag->data[6], end-6, &image, &width, &height);
uLongf datalen = width*height;
Bytef *data = malloc(datalen);
int error = uncompress(data, &datalen, &tag->data[end], (uLong)(tag->len - end));
if(error != Z_OK) {
fprintf(stderr, "Zlib error %d\n", error);
return 0;
}
int t, size = width*height;
for(t=0;t<size;t++) {
image[t*4+0] = data[t];
}
free(data);
png_write(filename, image, width, height);
free(image);
}
else {
int id = GET16(tag->data);
if (!extractanyids) {
fprintf(stderr, "Object %d is not a JPEG picture!\n", id);
exit(1);
}
return 0;
}
return 1;
}
#ifdef _ZLIB_INCLUDED_
static U32 mycrc32;
static U32*crc32_table = 0;
static void make_crc32_table(void)
{
int t;
if(crc32_table)
return;
crc32_table = (U32*)malloc(1024);
for (t = 0; t < 256; t++) {
U32 c = t;
int s;
for (s = 0; s < 8; s++) {
c = (0xedb88320L*(c&1)) ^ (c >> 1);
}
crc32_table[t] = c;
}
}
static inline void png_write_byte(FILE*fi, U8 byte)
{
fwrite(&byte,1,1,fi);
mycrc32 = crc32_table[(mycrc32 ^ byte) & 0xff] ^ (mycrc32 >> 8);
}
static void png_start_chunk(FILE*fi, char*type, int len)
{
U8 mytype[4]={0,0,0,0};
U32 mylen = BE_32_TO_NATIVE(len);
memcpy(mytype,type,strlen(type));
fwrite(&mylen, 4, 1, fi);
mycrc32=0xffffffff;
png_write_byte(fi,mytype[0]);
png_write_byte(fi,mytype[1]);
png_write_byte(fi,mytype[2]);
png_write_byte(fi,mytype[3]);
}
static void png_write_bytes(FILE*fi, U8*bytes, int len)
{
int t;
for(t=0;t<len;t++)
png_write_byte(fi,bytes[t]);
}
static void png_write_dword(FILE*fi, U32 dword)
{
png_write_byte(fi,dword>>24);
png_write_byte(fi,dword>>16);
png_write_byte(fi,dword>>8);
png_write_byte(fi,dword);
}
static void png_end_chunk(FILE*fi)
{
U32 tmp = BE_32_TO_NATIVE((mycrc32^0xffffffff));
fwrite(&tmp,4,1,fi);
}
/* extract a lossless image (png) out of a tag
This routine was originally meant to be a one-pager. I just
didn't know png is _that_ much fun. :) -mk
*/
int handlelossless(TAG*tag)
{
char name[80];
char*filename = name;
FILE*fi;
int width, height;
int crc;
int id;
int t;
U8 bpp = 1;
U8 format;
U8 tmp;
Bytef* data=0;
U8* data2=0;
U8* data3=0;
uLongf datalen;
uLongf datalen2;
U32 datalen3;
U8 head[] = {137,80,78,71,13,10,26,10};
int cols;
char alpha = tag->id == ST_DEFINEBITSLOSSLESS2;
RGBA* palette;
int pos;
int error;
U32 tmp32;
make_crc32_table();
if(tag->id != ST_DEFINEBITSLOSSLESS &&
tag->id != ST_DEFINEBITSLOSSLESS2) {
int id = GET16(tag->data);
if (!extractanyids) {
fprintf(stderr, "Object %d is not a PNG picture!\n",id);
exit(1);
}
return 0;
}
id =swf_GetU16(tag);
format = swf_GetU8(tag);
if(format == 3) bpp = 8;
if(format == 4) bpp = 16;
if(format == 5) bpp = 32;
if(format!=3 && format!=5) {
if(format==4)
fprintf(stderr, "Can't handle 16-bit palette images yet (image %d)\n",id);
else
fprintf(stderr, "Unknown image type %d in image %d\n", format, id);
return 0;
}
width = swf_GetU16(tag);
height = swf_GetU16(tag);
if(format == 3) cols = swf_GetU8(tag) + 1;
// this is what format means according to the flash specification. (which is
// clearly wrong)
// if(format == 4) cols = swf_GetU16(tag) + 1;
// if(format == 5) cols = swf_GetU32(tag) + 1;
else cols = 0;
msg("<verbose> Width %d", width);
msg("<verbose> Height %d", height);
msg("<verbose> Format %d", format);
msg("<verbose> Cols %d", cols);
msg("<verbose> Bpp %d", bpp);
datalen = (width*height*bpp/8+cols*8);
do {
if(data)
free(data);
datalen+=4096;
data = malloc(datalen);
error = uncompress (data, &datalen, &tag->data[tag->pos], tag->len-tag->pos);
} while(error == Z_BUF_ERROR);
if(error != Z_OK) {
fprintf(stderr, "Zlib error %d (image %d)\n", error, id);
return 0;
}
msg("<verbose> Uncompressed image is %d bytes (%d colormap)", datalen, (3+alpha)*cols);
pos = 0;
datalen2 = datalen+16;
data2 = malloc(datalen2);
palette = (RGBA*)malloc(cols*sizeof(RGBA));
for(t=0;t<cols;t++) {
palette[t].r = data[pos++];
palette[t].g = data[pos++];
palette[t].b = data[pos++];
if(alpha) {
palette[t].a = data[pos++];
}
}
prepare_name(name, sizeof(name), "pic", "png", id);
if(numextracts==1) {
filename = destfilename;
if(!strcmp(filename,"output.swf"))
filename = "output.png";
}
fi = save_fopen(filename, "wb");
fwrite(head,sizeof(head),1,fi);
png_start_chunk(fi, "IHDR", 13);
png_write_dword(fi,width);
png_write_dword(fi,height);
png_write_byte(fi,8);
if(format == 3)
png_write_byte(fi,3); //indexed
else if(format == 5 && alpha==0)
png_write_byte(fi,2); //rgb
else if(format == 5 && alpha==1)
png_write_byte(fi,6); //rgba
else return 0;
png_write_byte(fi,0); //compression mode
png_write_byte(fi,0); //filter mode
png_write_byte(fi,0); //interlace mode
png_end_chunk(fi);
if(format == 3) {
png_start_chunk(fi, "PLTE", 768);
for(t=0;t<256;t++) {
png_write_byte(fi,palette[t].r);
png_write_byte(fi,palette[t].g);
png_write_byte(fi,palette[t].b);
}
png_end_chunk(fi);
if(alpha) {
/* write alpha palette */
png_start_chunk(fi, "tRNS", 256);
for(t=0;t<256;t++) {
png_write_byte(fi,palette[t].a);
}
png_end_chunk(fi);