/*
* Internal constructor. Creates a new ZipEntry by reading the
* Central Directory Entry (CDE) from "in", which must be positioned
* at the CDE signature.
*
* On exit, "in" will be positioned at the start of the next entry
* in the Central Directory.
*/
ZipEntry(byte[] cdeHdrBuf, InputStream cdStream) throws IOException {
Streams.readFully(cdStream, cdeHdrBuf, 0, cdeHdrBuf.length);
BufferIterator it =
HeapBufferIterator.iterator(cdeHdrBuf, 0, cdeHdrBuf.length, ByteOrder.LITTLE_ENDIAN);
int sig = it.readInt();
if (sig != CENSIG) {
ZipFile.throwZipException("Central Directory Entry", sig);
}
it.seek(8);
int gpbf = it.readShort() & 0xffff;
if ((gpbf & ZipFile.GPBF_UNSUPPORTED_MASK) != 0) {
throw new ZipException("Invalid General Purpose Bit Flag: " + gpbf);
}
compressionMethod = it.readShort() & 0xffff;
time = it.readShort() & 0xffff;
modDate = it.readShort() & 0xffff;
// These are 32-bit values in the file, but 64-bit fields in this object.
crc = ((long) it.readInt()) & 0xffffffffL;
compressedSize = ((long) it.readInt()) & 0xffffffffL;
size = ((long) it.readInt()) & 0xffffffffL;
nameLength = it.readShort() & 0xffff;
int extraLength = it.readShort() & 0xffff;
int commentByteCount = it.readShort() & 0xffff;
// This is a 32-bit value in the file, but a 64-bit field in this object.
it.seek(42);
localHeaderRelOffset = ((long) it.readInt()) & 0xffffffffL;
byte[] nameBytes = new byte[nameLength];
Streams.readFully(cdStream, nameBytes, 0, nameBytes.length);
if (containsNulByte(nameBytes)) {
throw new ZipException("Filename contains NUL byte: " + Arrays.toString(nameBytes));
}
name = new String(nameBytes, 0, nameBytes.length, StandardCharsets.UTF_8);
if (extraLength > 0) {
extra = new byte[extraLength];
Streams.readFully(cdStream, extra, 0, extraLength);
}
// The RI has always assumed UTF-8. (If GPBF_UTF8_FLAG isn't set, the encoding is
// actually IBM-437.)
if (commentByteCount > 0) {
byte[] commentBytes = new byte[commentByteCount];
Streams.readFully(cdStream, commentBytes, 0, commentByteCount);
comment = new String(commentBytes, 0, commentBytes.length, StandardCharsets.UTF_8);
}
}
/** Copy a {@link Resources#openRawResource(int)} into {@link File} for testing purposes. */
private void stageFile(int rawId, File file) throws Exception {
new File(file.getParent()).mkdirs();
InputStream in = null;
OutputStream out = null;
try {
in = getContext().getResources().openRawResource(rawId);
out = new FileOutputStream(file);
Streams.copy(in, out);
} finally {
IoUtils.closeQuietly(in);
IoUtils.closeQuietly(out);
}
}
public void write(int oneByte) throws IOException {
Streams.writeSingleByte(this, oneByte);
}
/**
* Skip up to {@code byteCount} bytes of data on the underlying input stream. Any skipped bytes
* are added to the running checksum value.
*
* @param byteCount the number of bytes to skip.
* @throws IOException if this stream is closed or another I/O error occurs.
* @return the number of bytes skipped.
*/
@Override
public long skip(long byteCount) throws IOException {
return Streams.skipByReading(this, byteCount);
}
