LegacyConsoleArchive/jpexs-decompiler
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faster swf extract

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Honfika
2014-02-26 20:46:10 +01:00
parent 0a3d158dce
commit c5770daf41
10 changed files with 190 additions and 21 deletions
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trunk/src/com/jpexs/decompiler/flash/SWF.java
+76 -10
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@@ -335,9 +335,83 @@ public final class SWF implements TreeItem {
* @throws java.lang.InterruptedException
*/
public SWF(InputStream is, ProgressListener listener, boolean parallelRead) throws IOException, InterruptedException {
this(is, listener, parallelRead, false, false);
this(is, listener, parallelRead, false);
}
/**
* Faster constructor to check SWF only
* @param is
*/
public SWF(InputStream is) throws IOException {
byte[] hdr = new byte[3];
is.read(hdr);
String shdr = new String(hdr, Utf8Helper.charset);
if (!Arrays.asList(
"FWS", //Uncompressed Flash
"CWS", //ZLib compressed Flash
"ZWS", //LZMA compressed Flash
"GFX", //Uncompressed ScaleForm GFx
"CFX" //Compressed ScaleForm GFx
).contains(shdr)) {
throw new IOException("Invalid SWF file");
}
version = is.read();
fileSize = (is.read() + (is.read() << 8) + (is.read() << 16) + (is.read() << 24)) & 0xffffffff;
if (hdr[0] == 'C') {
is = new InflaterInputStream(is);
}
if (hdr[0] == 'Z') {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
//outSize
is.read();
is.read();
is.read();
is.read();
int propertiesSize = 5;
lzmaProperties = new byte[propertiesSize];
if (is.read(lzmaProperties, 0, propertiesSize) != propertiesSize) {
throw new IOException("LZMA:input .lzma file is too short");
}
long dictionarySize = 0;
for (int i = 0; i < 4; i++) {
dictionarySize += ((int) (lzmaProperties[1 + i]) & 0xFF) << (i * 8);
if (dictionarySize > Runtime.getRuntime().freeMemory()) {
throw new IOException("LZMA: Too large dictionary size");
}
}
SevenZip.Compression.LZMA.Decoder decoder = new SevenZip.Compression.LZMA.Decoder();
if (!decoder.SetDecoderProperties(lzmaProperties)) {
throw new IOException("LZMA:Incorrect stream properties");
}
if (!decoder.Code(is, baos, fileSize - 8)) {
throw new IOException("LZMA:Error in data stream");
}
} else {
long toRead = fileSize - 8;
if (toRead > 0) {
byte[] bytes = new byte[4096];
while (toRead > 4096) {
int read = is.read(bytes);
if (read == -1) {
throw new IOException("Invalid SWF file");
}
toRead -= read;
}
while (toRead > 0) {
int read = is.read(bytes, 0, (int) toRead);
if (read == -1) {
throw new IOException("Invalid SWF file");
}
toRead -= read;
}
}
}
}
/**
* Construct SWF from stream
*
@@ -345,11 +419,10 @@ public final class SWF implements TreeItem {
* @param listener
* @param parallelRead Use parallel threads?
* @param checkOnly Check only file validity
* @param skipTagReading
* @throws IOException
* @throws java.lang.InterruptedException
*/
public SWF(InputStream is, ProgressListener listener, boolean parallelRead, boolean checkOnly, boolean skipTagReading) throws IOException, InterruptedException {
public SWF(InputStream is, ProgressListener listener, boolean parallelRead, boolean checkOnly) throws IOException, InterruptedException {
byte[] hdr = new byte[3];
is.read(hdr);
String shdr = new String(hdr, Utf8Helper.charset);
@@ -412,13 +485,6 @@ public final class SWF implements TreeItem {
sis.readUI8(); //tmpFirstByetOfFrameRate
frameRate = sis.readUI8();
frameCount = sis.readUI16();
if (skipTagReading) {
long toRead = fileSize - sis.getPos();
if (toRead > 0) {
sis.readBytes(toRead);
}
return;
}
tags = sis.readTagList(this, 0, parallelRead, true, !checkOnly, gfx);
if (!checkOnly) {
Map<Long, Tag> tagMap = new HashMap<>();