What Is poi-5.2.3.jar?
What Is poi-5.2.3.jar?
✍: FYIcenter.com
poi-5.2.3.jar is one of the JAR files for Apache POI 5.2.3, which
provides an API for Microsoft document files of Word, Excel, PowerPoint, and Visio.
poi-5.2.3.jar supports Apache POI components that read and write Microsoft's OLE 2 Compound document format, which is used in early versions of Microsoft Office tools like Word 97, Excel 97, PowerPoint 97, etc.
poi-5.2.3.jar is distributed as part of the poi-bin-5.2.3-20220909.zip download file.
JAR File Size and Download Location:
JAR name: poi-5.2.3.jar Target JDK version: 9 File name: poi.jar, poi-5.2.3.jar File size: 2964641 bytes Release date: 09-09-2022 Download: Apache POI Website
Here are Java Source Code files for poi-5.2.3.jar:
⏎ org/apache/poi/util/RLEDecompressingInputStream.java
/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.util;
import java.io.IOException;
import java.io.InputStream;
import java.util.Locale;
import org.apache.commons.io.input.UnsynchronizedByteArrayInputStream;
import org.apache.commons.io.output.UnsynchronizedByteArrayOutputStream;
/**
* Wrapper of InputStream which provides Run Length Encoding (RLE)
* decompression on the fly. Uses MS-OVBA decompression algorithm. See
* http://download.microsoft.com/download/2/4/8/24862317-78F0-4C4B-B355-C7B2C1D997DB/[MS-OVBA].pdf
*/
public class RLEDecompressingInputStream extends InputStream {
/**
* Bitmasks for performance
*/
private static final int[] POWER2 = new int[] {
0x0001, // 2^0
0x0002, // 2^1
0x0004, // 2^2
0x0008, // 2^3
0x0010, // 2^4
0x0020, // 2^5
0x0040, // 2^6
0x0080, // 2^7
0x0100, // 2^8
0x0200, // 2^9
0x0400, // 2^10
0x0800, // 2^11
0x1000, // 2^12
0x2000, // 2^13
0x4000, // 2^14
0x8000 // 2^15
};
/** the wrapped inputstream */
private final InputStream in;
/** a byte buffer with size 4096 for storing a single chunk */
private final byte[] buf;
/** the current position in the byte buffer for reading */
private int pos;
/** the number of bytes in the byte buffer */
private int len;
/**
* Creates a new wrapper RLE Decompression InputStream.
*
* @param in The stream to wrap with the RLE Decompression
*/
public RLEDecompressingInputStream(InputStream in) throws IOException {
this.in = in;
buf = new byte[4096];
pos = 0;
int header = in.read();
if (header != 0x01) {
throw new IllegalArgumentException(String.format(Locale.ROOT, "Header byte 0x01 expected, received 0x%02X", header & 0xFF));
}
len = readChunk();
}
@Override
public int read() throws IOException {
if (len == -1) {
return -1;
}
if (pos >= len) {
if ((len = readChunk()) == -1) {
return -1;
}
}
return buf[pos++]& 0xFF;
}
@Override
public int read(byte[] b) throws IOException {
return read(b, 0, b.length);
}
@Override
public int read(byte[] b, int off, int l) throws IOException {
if (len == -1) {
return -1;
}
int offset = off;
int length = l;
while (length > 0) {
if (pos >= len) {
if ((len = readChunk()) == -1) {
return offset > off ? offset - off : -1;
}
}
int c = Math.min(length, len - pos);
System.arraycopy(buf, pos, b, offset, c);
pos += c;
length -= c;
offset += c;
}
return l;
}
@Override
public long skip(long n) throws IOException {
//this relies on readChunk's readFully to skipFully
long length = n;
while (length > 0) {
if (pos >= len) {
if ((len = readChunk()) == -1) {
return -1;
}
}
int c = (int) Math.min(n, len - (long)pos);
pos += c;
length -= c;
}
return n;
}
@Override
public int available() {
return (len > 0 ? len - pos : 0);
}
@Override
public void close() throws IOException {
in.close();
}
/**
* Reads a single chunk from the underlying inputstream.
*
* @return number of bytes that were read, or -1 if the end of the stream was reached.
*/
private int readChunk() throws IOException {
pos = 0;
int w = readShort(in);
if (w == -1 || w == 0) {
return -1;
}
int chunkSize = (w & 0x0FFF) + 1; // plus 3 bytes minus 2 for the length
if ((w & 0x7000) != 0x3000) {
throw new IllegalArgumentException(String.format(Locale.ROOT, "Chunksize header A should be 0x3000, received 0x%04X", w & 0xE000));
}
boolean rawChunk = (w & 0x8000) == 0;
if (rawChunk) {
if (IOUtils.readFully(in, buf, 0, chunkSize) < chunkSize) {
throw new IllegalStateException(String.format(Locale.ROOT, "Not enough bytes read, expected %d", chunkSize));
}
return chunkSize;
} else {
int inOffset = 0;
int outOffset = 0;
while (inOffset < chunkSize) {
int tokenFlags = in.read();
inOffset++;
if (tokenFlags == -1) {
break;
}
for (int n = 0; n < 8; n++) {
if (inOffset >= chunkSize) {
break;
}
if ((tokenFlags & POWER2[n]) == 0) {
// literal
final int b = in.read();
if (b == -1) {
return -1;
}
buf[outOffset++] = (byte) b;
inOffset++;
} else {
// compressed token
int token = readShort(in);
if (token == -1) {
return -1;
}
inOffset += 2;
int copyLenBits = getCopyLenBits(outOffset - 1);
int copyOffset = (token >> (copyLenBits)) + 1;
int copyLen = (token & (POWER2[copyLenBits] - 1)) + 3;
int startPos = outOffset - copyOffset;
int endPos = startPos + copyLen;
for (int i = startPos; i < endPos; i++) {
buf[outOffset++] = buf[i];
}
}
}
}
return outOffset;
}
}
/**
* Helper method to determine how many bits in the CopyToken are used for the CopyLength.
*
* @return returns the number of bits in the copy token (a value between 4 and 12)
*/
static int getCopyLenBits(int offset) {
for (int n = 11; n >= 4; n--) {
if ((offset & POWER2[n]) != 0) {
return 15 - n;
}
}
return 12;
}
/**
* Convenience method for read a 2-bytes short in little endian encoding.
*
* @return short value from the stream, -1 if end of stream is reached
*/
public int readShort() throws IOException {
return readShort(this);
}
/**
* Convenience method for read a 4-bytes int in little endian encoding.
*
* @return integer value from the stream, -1 if end of stream is reached
*/
public int readInt() throws IOException {
return readInt(this);
}
private int readShort(InputStream stream) throws IOException {
int b0, b1;
if ((b0 = stream.read()) == -1) {
return -1;
}
if ((b1 = stream.read()) == -1) {
return -1;
}
return (b0 & 0xFF) | ((b1 & 0xFF) << 8);
}
private int readInt(InputStream stream) throws IOException {
int b0, b1, b2, b3;
if ((b0 = stream.read()) == -1) {
return -1;
}
if ((b1 = stream.read()) == -1) {
return -1;
}
if ((b2 = stream.read()) == -1) {
return -1;
}
if ((b3 = stream.read()) == -1) {
return -1;
}
return (b0 & 0xFF) | ((b1 & 0xFF) << 8) | ((b2 & 0xFF) << 16) | ((b3 & 0xFF) << 24);
}
public static byte[] decompress(byte[] compressed) throws IOException {
return decompress(compressed, 0, compressed.length);
}
public static byte[] decompress(byte[] compressed, int offset, int length) throws IOException {
try (UnsynchronizedByteArrayOutputStream out = new UnsynchronizedByteArrayOutputStream();
InputStream instream = new UnsynchronizedByteArrayInputStream(compressed, offset, length);
InputStream stream = new RLEDecompressingInputStream(instream)) {
IOUtils.copy(stream, out);
return out.toByteArray();
}
}
}
⏎ org/apache/poi/util/RLEDecompressingInputStream.java
Or download all of them as a single archive file:
File name: poi-5.2.3-src.zip File size: 2479830 bytes Release date: 2022-09-09 Download
⇒ What Is poi-ooxml-5.2.3.jar?
⇐ What Is poi-bin-5.2.3-20220909.zip?
2017-04-04, ≈334🔥, 0💬
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