/**
* Check if the digital object conforms to this Module's internal signature information.
*
* <p>HTML is one of the most ill-defined of any open formats, so checking a "signature" really
* means using some heuristics. The only required tag is TITLE, but that could occur well into the
* file. So we look for any of three strings -- taking into account case-independence and white
* space -- within the first sigBytes bytes, and call that a signature check.
*
* @param file A File object for the object being parsed
* @param stream An InputStream, positioned at its beginning, which is generated from the object
* to be parsed
* @param info A fresh RepInfo object which will be modified to reflect the results of the test
*/
public void checkSignatures(File file, InputStream stream, RepInfo info) throws IOException {
info.setFormat(_format[0]);
info.setMimeType(_mimeType[0]);
info.setModule(this);
char[][] sigtext = new char[3][];
sigtext[0] = "<!DOCTYPE HTML".toCharArray();
sigtext[1] = "<HTML".toCharArray();
sigtext[2] = "<TITLE".toCharArray();
int[] sigstate = {0, 0, 0};
JhoveBase jb = getBase();
int sigBytes = jb.getSigBytes();
int bytesRead = 0;
boolean eof = false;
DataInputStream dstream = new DataInputStream(stream);
while (!eof && bytesRead < sigBytes) {
try {
int ch = readUnsignedByte(dstream, this);
char chr = Character.toUpperCase((char) ch);
++bytesRead;
if (Character.isWhitespace(chr)) {
continue; // ignore all whitespace
}
for (int i = 0; i < 3; i++) {
int ss = sigstate[i];
char[] st = sigtext[i];
if (chr == st[ss]) {
++sigstate[i];
if (sigstate[i] == st.length) {
// One of the sig texts matches!
info.setSigMatch(_name);
return;
}
} else sigstate[i] = 0;
}
} catch (EOFException e) {
eof = true;
}
}
// If we fall through, there was no sig match
info.setWellFormed(false);
return;
}
/**
* Parses the content of a purported WAVE digital object and stores the results in RepInfo.
*
* @param stream An InputStream, positioned at its beginning, which is generated from the object
* to be parsed
* @param info A fresh RepInfo object which will be modified to reflect the results of the parsing
* @param parseIndex Must be 0 in first call to <code>parse</code>. If <code>parse</code> returns
* a nonzero value, it must be called again with <code>parseIndex</code> equal to that return
* value.
*/
public int parse(InputStream stream, RepInfo info, int parseIndex) throws IOException {
initParse();
info.setFormat(_format[0]);
info.setMimeType(_mimeType[0]);
info.setModule(this);
_aesMetadata.setPrimaryIdentifier(info.getUri());
if (info.getURLFlag()) {
_aesMetadata.setOtherPrimaryIdentifierType("URI");
} else {
_aesMetadata.setPrimaryIdentifierType(AESAudioMetadata.FILE_NAME);
}
/* We may have already done the checksums while converting a
temporary file. */
_ckSummer = null;
if (_je != null && _je.getChecksumFlag() && info.getChecksum().size() == 0) {
_ckSummer = new Checksummer();
_cstream = new ChecksumInputStream(stream, _ckSummer);
_dstream = getBufferedDataStream(_cstream, _je != null ? _je.getBufferSize() : 0);
} else {
_dstream = getBufferedDataStream(stream, _je != null ? _je.getBufferSize() : 0);
}
try {
// Check the start of the file for the right opening bytes
for (int i = 0; i < 4; i++) {
int ch = readUnsignedByte(_dstream, this);
if (ch != sigByte[i]) {
info.setMessage(new ErrorMessage("Document does not start with RIFF chunk", 0));
info.setWellFormed(false);
return 0;
}
}
/* If we got this far, take note that the signature is OK. */
info.setSigMatch(_name);
// Get the length of the Form chunk. This includes all
// the subsequent chunks in the file, but excludes the
// header ("FORM" and the length itself).
bytesRemaining = readUnsignedInt(_dstream);
// Read the file type.
String typ = read4Chars(_dstream);
bytesRemaining -= 4;
if (!"WAVE".equals(typ)) {
info.setMessage(new ErrorMessage("File type in RIFF header is not WAVE", _nByte));
info.setWellFormed(false);
return 0;
}
while (bytesRemaining > 0) {
if (!readChunk(info)) {
break;
}
}
} catch (EOFException e) {
info.setWellFormed(false);
info.setMessage(new ErrorMessage("Unexpected end of file", _nByte));
return 0;
}
// Set duration from number of samples and rate.
if (numSamples > 0) {
// _aesMetadata.setDuration((double) numSamples / sampleRate);
_aesMetadata.setDuration(numSamples);
}
// Add note and label properties, if there's anything
// to report.
if (!_labels.isEmpty()) {
_propList.add(new Property("Labels", PropertyType.PROPERTY, PropertyArity.LIST, _labels));
}
if (!_labeledText.isEmpty()) {
_propList.add(
new Property("LabeledText", PropertyType.PROPERTY, PropertyArity.LIST, _labeledText));
}
if (!_notes.isEmpty()) {
_propList.add(new Property("Notes", PropertyType.PROPERTY, PropertyArity.LIST, _notes));
}
if (!_samples.isEmpty()) {
_propList.add(new Property("Samples", PropertyType.PROPERTY, PropertyArity.LIST, _samples));
}
if (_exifInfo != null) {
_propList.add(_exifInfo.buildProperty());
}
if (!formatChunkSeen) {
info.setMessage(new ErrorMessage("No Format Chunk"));
info.setWellFormed(false);
return 0;
}
/* This file looks OK. */
if (_ckSummer != null) {
/* We may not have actually hit the end of file. If we're calculating
* checksums on the fly, we have to read and discard whatever is
* left, so it will get checksummed. */
for (; ; ) {
try {
int n = skipBytes(_dstream, 2048, this);
if (n == 0) {
break;
}
} catch (Exception e) {
break;
}
}
info.setSize(_cstream.getNBytes());
info.setChecksum(new Checksum(_ckSummer.getCRC32(), ChecksumType.CRC32));
String value = _ckSummer.getMD5();
if (value != null) {
info.setChecksum(new Checksum(value, ChecksumType.MD5));
}
if ((value = _ckSummer.getSHA1()) != null) {
info.setChecksum(new Checksum(value, ChecksumType.SHA1));
}
}
info.setProperty(_metadata);
// Indicate satisfied profiles.
if (flagPCMWaveFormat) {
info.setProfile("PCMWAVEFORMAT");
}
if (flagWaveFormatEx) {
info.setProfile("WAVEFORMATEX");
}
if (flagWaveFormatExtensible) {
info.setProfile("WAVEFORMATEXTENSIBLE");
}
if (flagBroadcastWave) {
// Need to do some additional checks.
if (!broadcastExtChunkSeen) {
flagBroadcastWave = false;
}
if (compressionCode == FormatChunk.WAVE_FORMAT_MPEG) {
if (!broadcastExtChunkSeen || !factChunkSeen) {
flagBroadcastWave = false;
}
}
if (flagBroadcastWave) {
String prof = null;
switch (broadcastVersion) {
case 0:
prof = "Broadcast Wave Version 0";
break;
case 1:
prof = "Broadcast Wave Version 1";
break;
// Other versions are unknown at this time
}
if (prof != null) {
info.setProfile(prof);
}
}
}
return 0;
}