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package SevenZip.Archive.SevenZip;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.Vector;
import Common.BoolVector;
import Common.IntVector;
import SevenZip.IInStream;
import SevenZip.Common.StreamUtils;
public class InStream {
public static final int kNumMax = 0x7FFFFFFF;
final IInStream stream;
private final Vector _inByteVector = new Vector();
private /* TODO: final */ InByte2 _inByteBack = null;
final long archiveBeginStreamPosition;
long position;
public InStream(IInStream stream, long searchHeaderSizeLimit) throws IOException {
this.stream = stream;
this.position = stream.Seek(0, IInStream.STREAM_SEEK_CUR);
this.archiveBeginStreamPosition = FindAndReadSignature(searchHeaderSizeLimit);
}
private long FindAndReadSignature(
long searchHeaderSizeLimit) throws IOException {
this.stream.Seek(this.position, IInStream.STREAM_SEEK_SET);
byte[] signature = new byte[Header.kSignatureSize];
int processedSize = ReadDirect(this.stream, signature, 0, Header.kSignatureSize);
if (processedSize != Header.kSignatureSize)
throw new IOException("detected illegal signature length: " + processedSize + " at byte " + this.position);
if (TestSignatureCandidate(signature, 0))
return this.position;
// SFX support
final int kBufferSize = 1 << 16;
byte [] buffer = new byte[kBufferSize];
int numPrevBytes = Header.kSignatureSize - 1;
System.arraycopy(signature, 1, buffer, 0, numPrevBytes);
long curTestPos = this.position + 1;
while (searchHeaderSizeLimit == -1 ||
curTestPos - this.position <= searchHeaderSizeLimit) {
int numReadBytes = kBufferSize - numPrevBytes;
processedSize = ReadDirect(this.stream, buffer, numPrevBytes, numReadBytes);
if (processedSize == -1)
throw new IOException("unexpected EOF during search for signature");
int numBytesInBuffer = numPrevBytes + processedSize;
if (numBytesInBuffer < Header.kSignatureSize)
throw new IOException("detected illegal signature length: " + numBytesInBuffer + " at byte " + this.position);
int numTests = numBytesInBuffer - Header.kSignatureSize + 1;
for (int pos=0; pos<numTests; pos++, curTestPos++) {
if (TestSignatureCandidate(buffer, pos)) {
this.position = curTestPos + Header.kSignatureSize;
this.stream.Seek(this.position, IInStream.STREAM_SEEK_SET);
return curTestPos;
}
}
numPrevBytes = numBytesInBuffer - numTests;
System.arraycopy(buffer, numTests, buffer, 0, numPrevBytes);
}
throw new IOException("signature not found within the given " + searchHeaderSizeLimit + " bytes");
}
public void AddByteStream(byte [] buffer, int size) {
this._inByteVector.add(this._inByteBack = new InByte2(buffer, size));
}
public void DeleteByteStream() {
this._inByteVector.removeElementAt(this._inByteVector.size() - 1);
if (!this._inByteVector.isEmpty())
this._inByteBack = (InByte2)this._inByteVector.lastElement();
}
public static boolean TestSignatureCandidate(byte[] testBytes, int off) {
if (off == 0)
return Arrays.equals(testBytes, Header.kSignature);
for (int i=0; i<Header.kSignatureSize; i++) {
// System.out.println(" " + i + ":" + testBytes[i] + " " + kSignature[i]);
if (testBytes[i + off] != Header.kSignature[i])
return false;
}
return true;
}
public int ReadDirect(
IInStream stream,
byte[] data,
int off,
int size) throws IOException {
int realProcessedSize = StreamUtils.ReadStream(stream, data, off, size);
if (realProcessedSize != -1)
this.position += realProcessedSize;
return realProcessedSize;
}
public int ReadDirect(byte[] data, int size) throws IOException {
return ReadDirect(this.stream, data, 0, size);
}
public boolean SafeReadDirect(byte[] data, int size) throws IOException {
return (ReadDirect(data, size) == size);
}
public int SafeReadDirectUInt32() throws IOException {
int val = 0;
byte[] b = new byte[4];
int realProcessedSize = ReadDirect(b, 4);
if (realProcessedSize != 4)
throw new IOException("Unexpected End Of Archive"); // throw CInArchiveException(CInArchiveException::kUnexpectedEndOfArchive);
for (int i = 0; i < 4; i++)
val |= (b[i] & 0xFF) << (8 * i);
return val;
}
public int ReadUInt32() throws IOException {
int value = 0;
for (int i = 0; i < 4; i++) {
int b = ReadByte();
value |= ((b) << (8 * i));
}
return value;
}
public long ReadUInt64() throws IOException {
long value = 0;
for (int i = 0; i < 8; i++) {
int b = ReadByte();
value |= (((long)b) << (8 * i));
}
return value;
}
public boolean ReadBytes(byte data[], int size) throws IOException {
return this._inByteBack.ReadBytes(data, size);
}
public boolean ReadBytes(ByteArrayOutputStream baos, int size) throws IOException {
return this._inByteBack.readBytes(baos, size) == size;
}
public int ReadByte() throws IOException {
return this._inByteBack.ReadByte();
}
public long SafeReadDirectUInt64() throws IOException {
long val = 0;
byte [] b = new byte[8];
int realProcessedSize = ReadDirect(b, 8);
if (realProcessedSize != 8)
throw new IOException("Unexpected End Of Archive"); // throw CInArchiveException(CInArchiveException::kUnexpectedEndOfArchive);
for (int i = 0; i < 8; i++) {
val |= ((long)(b[i] & 0xFF) << (8 * i));
}
return val;
}
public char ReadWideCharLE() throws IOException {
int b1 = this._inByteBack.ReadByte();
int b2 = this._inByteBack.ReadByte();
char c = (char)(((char)(b2) << 8) + b1);
return c;
}
public long ReadNumber() throws IOException {
int firstByte = ReadByte();
int mask = 0x80;
long value = 0;
for (int i = 0; i < 8; i++) {
if ((firstByte & mask) == 0) {
long highPart = firstByte & (mask - 1);
value += (highPart << (i * 8));
return value;
}
int b = ReadByte();
if (b < 0)
throw new IOException("ReadNumber - Can't read stream");
value |= (((long)b) << (8 * i));
mask >>= 1;
}
return value;
}
public int ReadNum() throws IOException { // CNum
long value64 = ReadNumber();
if (value64 > InStream.kNumMax)
throw new IOException("ReadNum - value > CNum.kNumMax"); // return E_FAIL;
return (int)value64;
}
public long ReadID() throws IOException {
return ReadNumber();
}
public void SkeepData(long size) throws IOException {
for (long i = 0; i < size; i++)
ReadByte();
}
public void SkeepData() throws IOException {
long size = ReadNumber();
SkeepData(size);
}
public void skipToAttribute(long attribute) throws IOException {
long type;
while ((type = ReadID()) != attribute) {
if (type == Header.NID.kEnd)
throw new IOException("unexpected end of archive");
SkeepData();
}
}
public void close() throws IOException {
if (this.stream != null) this.stream.close(); // _stream.Release();
}
public BoolVector ReadBoolVector(int numItems) throws IOException {
BoolVector v = new BoolVector(numItems);
int b = 0;
int mask = 0;
for (int i=0; i<numItems; i++) {
if (mask == 0) {
b = ReadByte();
mask = 0x80;
}
v.add((b & mask) != 0);
mask >>= 1;
}
return v;
}
public BoolVector ReadBoolVector2(int numItems) throws IOException { // CBoolVector
int allAreDefined = ReadByte();
if (allAreDefined == 0)
return ReadBoolVector(numItems);
BoolVector v = new BoolVector(numItems);
for (int i = 0; i < numItems; i++)
v.add(true);
return v;
}
public IntVector ReadHashDigests(
int numItems,
BoolVector digestsDefined) throws IOException {
digestsDefined.setBoolVector(ReadBoolVector2(numItems));
final IntVector digests = new IntVector(numItems);
digests.clear();
digests.Reserve(numItems);
for (int i=0; i<numItems; i++) {
int crc = 0;
if (digestsDefined.get(i))
crc = ReadUInt32();
digests.add(crc);
}
return digests;
}
public static final long SECS_BETWEEN_EPOCHS = 11644473600L;
public static final long SECS_TO_100NS = 10000000L; /* 10^7 */
public static long FileTimeToLong(int dwHighDateTime, int dwLowDateTime) {
// The FILETIME structure is a 64-bit value representing the number of 100-nanosecond intervals since January 1
long tm = dwHighDateTime;
tm <<=32;
tm |= (dwLowDateTime & 0xFFFFFFFFL);
return (tm - (SECS_BETWEEN_EPOCHS * SECS_TO_100NS)) / (10000L); /* now convert to milliseconds */
}
}
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