in src/main/java/org/apache/commons/compress/archivers/sevenz/SevenZFile.java [1082:1225]
private void readFilesInfo(final ByteBuffer header, final Archive archive) throws IOException {
final int numFilesInt = (int) readUint64(header);
final Map<Integer, SevenZArchiveEntry> fileMap = new LinkedHashMap<>();
BitSet isEmptyStream = null;
BitSet isEmptyFile = null;
BitSet isAnti = null;
while (true) {
final int propertyType = getUnsignedByte(header);
if (propertyType == 0) {
break;
}
final long size = readUint64(header);
switch (propertyType) {
case NID.kEmptyStream: {
isEmptyStream = readBits(header, numFilesInt);
break;
}
case NID.kEmptyFile: {
isEmptyFile = readBits(header, isEmptyStream.cardinality());
break;
}
case NID.kAnti: {
isAnti = readBits(header, isEmptyStream.cardinality());
break;
}
case NID.kName: {
/* final int external = */ getUnsignedByte(header);
final byte[] names = new byte[(int) (size - 1)];
final int namesLength = names.length;
get(header, names);
int nextFile = 0;
int nextName = 0;
for (int i = 0; i < namesLength; i += 2) {
if (names[i] == 0 && names[i + 1] == 0) {
checkEntryIsInitialized(fileMap, nextFile);
fileMap.get(nextFile).setName(new String(names, nextName, i - nextName, UTF_16LE));
nextName = i + 2;
nextFile++;
}
}
if (nextName != namesLength || nextFile != numFilesInt) {
throw new IOException("Error parsing file names");
}
break;
}
case NID.kCTime: {
final BitSet timesDefined = readAllOrBits(header, numFilesInt);
/* final int external = */ getUnsignedByte(header);
for (int i = 0; i < numFilesInt; i++) {
checkEntryIsInitialized(fileMap, i);
final SevenZArchiveEntry entryAtIndex = fileMap.get(i);
entryAtIndex.setHasCreationDate(timesDefined.get(i));
if (entryAtIndex.getHasCreationDate()) {
entryAtIndex.setCreationDate(getLong(header));
}
}
break;
}
case NID.kATime: {
final BitSet timesDefined = readAllOrBits(header, numFilesInt);
/* final int external = */ getUnsignedByte(header);
for (int i = 0; i < numFilesInt; i++) {
checkEntryIsInitialized(fileMap, i);
final SevenZArchiveEntry entryAtIndex = fileMap.get(i);
entryAtIndex.setHasAccessDate(timesDefined.get(i));
if (entryAtIndex.getHasAccessDate()) {
entryAtIndex.setAccessDate(getLong(header));
}
}
break;
}
case NID.kMTime: {
final BitSet timesDefined = readAllOrBits(header, numFilesInt);
/* final int external = */ getUnsignedByte(header);
for (int i = 0; i < numFilesInt; i++) {
checkEntryIsInitialized(fileMap, i);
final SevenZArchiveEntry entryAtIndex = fileMap.get(i);
entryAtIndex.setHasLastModifiedDate(timesDefined.get(i));
if (entryAtIndex.getHasLastModifiedDate()) {
entryAtIndex.setLastModifiedDate(getLong(header));
}
}
break;
}
case NID.kWinAttributes: {
final BitSet attributesDefined = readAllOrBits(header, numFilesInt);
/* final int external = */ getUnsignedByte(header);
for (int i = 0; i < numFilesInt; i++) {
checkEntryIsInitialized(fileMap, i);
final SevenZArchiveEntry entryAtIndex = fileMap.get(i);
entryAtIndex.setHasWindowsAttributes(attributesDefined.get(i));
if (entryAtIndex.getHasWindowsAttributes()) {
entryAtIndex.setWindowsAttributes(getInt(header));
}
}
break;
}
case NID.kDummy: {
// 7z 9.20 asserts the content is all zeros and ignores the property
// Compress up to 1.8.1 would throw an exception, now we ignore it (see COMPRESS-287
skipBytesFully(header, size);
break;
}
default: {
// Compress up to 1.8.1 would throw an exception, now we ignore it (see COMPRESS-287
skipBytesFully(header, size);
break;
}
}
}
int nonEmptyFileCounter = 0;
int emptyFileCounter = 0;
for (int i = 0; i < numFilesInt; i++) {
final SevenZArchiveEntry entryAtIndex = fileMap.get(i);
if (entryAtIndex == null) {
continue;
}
entryAtIndex.setHasStream(isEmptyStream == null || !isEmptyStream.get(i));
if (entryAtIndex.hasStream()) {
if (archive.subStreamsInfo == null) {
throw new IOException("Archive contains file with streams but no subStreamsInfo");
}
entryAtIndex.setDirectory(false);
entryAtIndex.setAntiItem(false);
entryAtIndex.setHasCrc(archive.subStreamsInfo.hasCrc.get(nonEmptyFileCounter));
entryAtIndex.setCrcValue(archive.subStreamsInfo.crcs[nonEmptyFileCounter]);
entryAtIndex.setSize(archive.subStreamsInfo.unpackSizes[nonEmptyFileCounter]);
if (entryAtIndex.getSize() < 0) {
throw new IOException("broken archive, entry with negative size");
}
++nonEmptyFileCounter;
} else {
entryAtIndex.setDirectory(isEmptyFile == null || !isEmptyFile.get(emptyFileCounter));
entryAtIndex.setAntiItem(isAnti != null && isAnti.get(emptyFileCounter));
entryAtIndex.setHasCrc(false);
entryAtIndex.setSize(0);
++emptyFileCounter;
}
}
archive.files = fileMap.values().stream().filter(Objects::nonNull).toArray(SevenZArchiveEntry[]::new);
calculateStreamMap(archive);
}