获取 org.tukaani.xz.UnsupportedOptionsException:尝试解码LZMA压缩xls文件时，未压缩的大小太大错误。非LZMA文件可以解压缩/解码而没有任何问题。两种情况都压缩相同的xls文件。
我正在使用Apache Commons compress和org.tukaani.xz。
供参考的示例代码
package com.concept.utilities.zip;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipFile;
import org.apache.commons.compress.compressors.lzma.LZMACompressorInputStream;
public class ApacheComm {
public void extractLZMAZip(File zipFile, String compressFileName, String destFolder) {
ZipFile zip = null;
try {
zip = new ZipFile(zipFile);
ZipArchiveEntry zipArchiveEntry = zip.getEntry(compressFileName);
if (null != zipArchiveEntry) {
String name = zipArchiveEntry.getName();
// InputStream is = zip.getInputStream(zipArchiveEntry);
InputStream israw = zip.getRawInputStream(zipArchiveEntry);
LZMACompressorInputStream lzma = new LZMACompressorInputStream(israw);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != zip)
ZipFile.closeQuietly(zip);
}
}
public static void main(String[] args) throws IOException {
ApacheComm c = new ApacheComm();
try {
c.extractLZMAZip(new File("H:\\archives\\rollLZMA.zip"), "roll.xls", "H:\\archives\\");
} catch (Exception e) {
e.printStackTrace();
}
}
}
错误
org.tukaani.xz.UnsupportedOptionsException: Uncompressed size is too big
at org.tukaani.xz.LZMAInputStream.initialize(Unknown Source)
at org.tukaani.xz.LZMAInputStream.<init>(Unknown Source)
at org.apache.commons.compress.compressors.lzma.LZMACompressorInputStream.<init>(LZMACompressorInputStream.java:50)
at com.concept.utilities.zip.ApacheComm.extractLZMAZip(ApacheComm.java:209)
at com.concept.utilities.zip.ApacheComm.main(ApacheComm.java:224)
我想念什么吗？还有其他方法可以通过压缩方法= LZMA 解码 zip文件吗？
最佳答案
您的代码无法正常运行的原因是，与普通的压缩LZMA文件相比，Zip LZMA压缩数据段的标头不同。
您可以在https://pkware.cachefly.net/webdocs/casestudies/APPNOTE.TXT(4.4.4通用位标志，5.8 LZMA-方法14)上阅读规范，但请引用重要的部分:
5.8.5 LZMA压缩数据段将由LZMA属性标题和LZMA压缩数据组成，如下所示:
[LZMA properties header for file 1]
[LZMA compressed data for file 1]
5.8.8 LZMA属性标题中的属性信息的存储字段如下:
LZMA Version Information 2 bytes
LZMA Properties Size 2 bytes
LZMA Properties Data variable, defined by "LZMA Properties Size"
5.8.8.2 LZMA属性大小-此字段定义剩余属性数据的大小。通常，此大小应由SDK的版本确定。包括此size字段是为了方便并帮助避免由于此压缩算法的更改而在将来引起的任何歧义。
5.8.8.3 LZMA属性数据-此可变大小的字段记录了LZMA SDK定义的解压缩器所需的值。应使用“LZMA版本信息”字段定义的SDK版本中的WriteCoderProperties()获取存储在此字段中的数据。
代码示例:
import org.apache.commons.compress.archivers.zip.ZipArchiveEntry;
import org.apache.commons.compress.archivers.zip.ZipFile;
import org.apache.commons.compress.archivers.zip.ZipMethod;
import org.apache.commons.io.IOUtils;
import org.tukaani.xz.LZMAInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
public class ApacheComm
{
public InputStream getInputstreamForEntry(ZipFile zipFile, ZipArchiveEntry ze) throws IOException
{
if (zipFile.canReadEntryData(ze))
{
return zipFile.getInputStream(ze);
} else if (ze.getMethod() == ZipMethod.LZMA.getCode()) {
InputStream inputStream = zipFile.getRawInputStream(ze);
ByteBuffer buffer = ByteBuffer.wrap(IOUtils.readFully(inputStream, 9))
.order(ByteOrder.LITTLE_ENDIAN);
// Lzma sdk version used to compress this data
int majorVersion = buffer.get();
int minorVersion = buffer.get();
// Byte count of the following data represent as an unsigned short.
// Should be = 5 (propByte + dictSize) in all versions
int size = buffer.getShort() & 0xffff;
if (size != 5)
throw new UnsupportedOperationException();
byte propByte = buffer.get();
// Dictionary size is an unsigned 32-bit little endian integer.
int dictSize = buffer.getInt();
long uncompressedSize;
if ((ze.getRawFlag() & (1 << 1)) != 0)
{
// If the entry uses EOS marker, use -1 to indicate
uncompressedSize = -1;
} else {
uncompressedSize = ze.getSize();
}
return new LZMAInputStream(inputStream, uncompressedSize, propByte, dictSize);
} else {
throw new UnsupportedOperationException();
}
}
}