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Add support for non-standard ABC-compressed SWF file

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This commit is contained in:
honfika@gmail.com
2015-02-09 13:31:32 +01:00
parent 6917a16454
commit 4106f764bf
2 changed files with 64 additions and 39 deletions
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92
libsrc/ffdec_lib/src/com/jpexs/decompiler/flash/SWF.java
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@@ -540,6 +540,14 @@ public final class SWF implements SWFContainerItem, Timelined {
}
public String getHeaderBytes() {
return getHeaderBytes(compression, gfx);
}
private String getHeaderBytes(SWFCompression compression, boolean gfx) {
if (compression == SWFCompression.LZMA_ABC) {
return "ABC";
}
String ret = "";
if (compression == SWFCompression.LZMA) {
ret += 'Z';
@@ -585,30 +593,14 @@ public final class SWF implements SWFContainerItem, Timelined {
sos.writeUI16(0);
}
sos.close();
if (compression == SWFCompression.LZMA) {
os.write('Z');
} else if (compression == SWFCompression.ZLIB) {
os.write('C');
} else {
if (gfx) {
os.write('G');
} else {
os.write('F');
}
}
if (gfx) {
os.write('F');
os.write('X');
} else {
os.write('W');
os.write('S');
}
os.write(Utf8Helper.getBytes(getHeaderBytes(compression, gfx)));
os.write(version);
byte[] data = baos.toByteArray();
sos = new SWFOutputStream(os, version);
sos.writeUI32(data.length + 8);
if (compression == SWFCompression.LZMA) {
if (compression == SWFCompression.LZMA || compression == SWFCompression.LZMA_ABC) {
long uncompressedLength = data.length;
Encoder enc = new Encoder();
int val = lzmaProperties[0] & 0xFF;
int lc = val % 9;
@@ -628,13 +620,27 @@ public final class SWF implements SWFContainerItem, Timelined {
enc.SetEndMarkerMode(true);
enc.Code(new ByteArrayInputStream(data), baos, -1, -1, null);
data = baos.toByteArray();
byte[] udata = new byte[4];
udata[0] = (byte) (data.length & 0xFF);
udata[1] = (byte) ((data.length >> 8) & 0xFF);
udata[2] = (byte) ((data.length >> 16) & 0xFF);
udata[3] = (byte) ((data.length >> 24) & 0xFF);
os.write(udata);
if (compression == SWFCompression.LZMA) {
byte[] udata = new byte[4];
udata[0] = (byte) (data.length & 0xFF);
udata[1] = (byte) ((data.length >> 8) & 0xFF);
udata[2] = (byte) ((data.length >> 16) & 0xFF);
udata[3] = (byte) ((data.length >> 24) & 0xFF);
os.write(udata);
}
enc.WriteCoderProperties(os);
if (compression == SWFCompression.LZMA_ABC) {
byte[] udata = new byte[8];
udata[0] = (byte) (uncompressedLength & 0xFF);
udata[1] = (byte) ((uncompressedLength >> 8) & 0xFF);
udata[2] = (byte) ((uncompressedLength >> 16) & 0xFF);
udata[3] = (byte) ((uncompressedLength >> 24) & 0xFF);
udata[4] = (byte) ((uncompressedLength >> 32) & 0xFF);
udata[5] = (byte) ((uncompressedLength >> 40) & 0xFF);
udata[6] = (byte) ((uncompressedLength >> 48) & 0xFF);
udata[7] = (byte) ((uncompressedLength >> 56) & 0xFF);
os.write(udata);
}
} else if (compression == SWFCompression.ZLIB) {
os = new DeflaterOutputStream(os);
}
@@ -948,6 +954,16 @@ public final class SWF implements SWFContainerItem, Timelined {
}
}
private static void decodeLZMAStream(InputStream is, OutputStream os, byte[] lzmaProperties, long fileSize) throws IOException {
Decoder decoder = new Decoder();
if (!decoder.SetDecoderProperties(lzmaProperties)) {
throw new IOException("LZMA:Incorrect stream properties");
}
if (!decoder.Code(is, os, fileSize - 8)) {
throw new IOException("LZMA:Error in data stream");
}
}
private static SWFHeader decompress(InputStream is, OutputStream os, boolean allowUncompressed) throws IOException {
byte[] hdr = new byte[8];
@@ -962,7 +978,8 @@ public final class SWF implements SWFContainerItem, Timelined {
"CWS", // ZLib compressed Flash
"ZWS", // LZMA compressed Flash
"GFX", // Uncompressed ScaleForm GFx
"CFX" // Compressed ScaleForm GFx
"CFX", // Compressed ScaleForm GFx
"ABC" // Non-standard LZMA compressed Flash
).contains(signature)) {
throw new IOException("Invalid SWF file");
}
@@ -979,7 +996,7 @@ public final class SWF implements SWFContainerItem, Timelined {
}
try (SWFOutputStream sos = new SWFOutputStream(os, version)) {
sos.write(Utf8Helper.getBytes("FWS"));
sos.write(Utf8Helper.getBytes(header.gfx ? "GFX" : "FWS"));
sos.writeUI8(version);
sos.writeUI32(fileSize);
@@ -1000,18 +1017,25 @@ public final class SWF implements SWFContainerItem, Timelined {
if (lzmaProperties.length != propertiesSize) {
throw new IOException("LZMA:input .lzma file is too short");
}
Decoder decoder = new Decoder();
if (!decoder.SetDecoderProperties(lzmaProperties)) {
throw new IOException("LZMA:Incorrect stream properties");
}
if (!decoder.Code(is, os, fileSize - 8)) {
throw new IOException("LZMA:Error in data stream");
}
decodeLZMAStream(is, os, lzmaProperties, fileSize);
header.compression = SWFCompression.LZMA;
header.lzmaProperties = lzmaProperties;
break;
}
case 'A': { // ABC
byte[] lzmaProperties = new byte[5];
is.read(lzmaProperties);
byte[] uncompressedLength = new byte[8];
is.read(uncompressedLength);
decodeLZMAStream(is, os, lzmaProperties, fileSize);
header.compression = SWFCompression.LZMA_ABC;
header.lzmaProperties = lzmaProperties;
break;
}
default: { // FWS, GFX
if (allowUncompressed) {
Helper.copyStream(is, os, fileSize - 8);