diff options
Diffstat (limited to 'src/de/danoeh/antennapod/util/vorbiscommentreader/VorbisCommentReader.java')
| -rw-r--r-- | src/de/danoeh/antennapod/util/vorbiscommentreader/VorbisCommentReader.java | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/src/de/danoeh/antennapod/util/vorbiscommentreader/VorbisCommentReader.java b/src/de/danoeh/antennapod/util/vorbiscommentreader/VorbisCommentReader.java deleted file mode 100644 index 718a4f30f..000000000 --- a/src/de/danoeh/antennapod/util/vorbiscommentreader/VorbisCommentReader.java +++ /dev/null @@ -1,194 +0,0 @@ -package de.danoeh.antennapod.util.vorbiscommentreader; - -import org.apache.commons.io.EndianUtils; -import org.apache.commons.io.IOUtils; - -import java.io.IOException; -import java.io.InputStream; -import java.io.UnsupportedEncodingException; -import java.nio.ByteBuffer; -import java.nio.charset.Charset; -import java.util.Arrays; - - -public abstract class VorbisCommentReader { - /** Length of first page in an ogg file in bytes. */ - private static final int FIRST_PAGE_LENGTH = 58; - private static final int SECOND_PAGE_MAX_LENGTH = 64 * 1024 * 1024; - private static final int PACKET_TYPE_IDENTIFICATION = 1; - private static final int PACKET_TYPE_COMMENT = 3; - - /** Called when Reader finds identification header. */ - public abstract void onVorbisCommentFound(); - - public abstract void onVorbisCommentHeaderFound(VorbisCommentHeader header); - - /** - * Is called every time the Reader finds a content vector. The handler - * should return true if it wants to handle the content vector. - */ - public abstract boolean onContentVectorKey(String content); - - /** - * Is called if onContentVectorKey returned true for the key. - * - * @throws VorbisCommentReaderException - */ - public abstract void onContentVectorValue(String key, String value) - throws VorbisCommentReaderException; - - public abstract void onNoVorbisCommentFound(); - - public abstract void onEndOfComment(); - - public abstract void onError(VorbisCommentReaderException exception); - - public void readInputStream(InputStream input) - throws VorbisCommentReaderException { - try { - // look for identification header - if (findIdentificationHeader(input)) { - - onVorbisCommentFound(); - input = new OggInputStream(input); - if (findCommentHeader(input)) { - VorbisCommentHeader commentHeader = readCommentHeader(input); - if (commentHeader != null) { - onVorbisCommentHeaderFound(commentHeader); - for (int i = 0; i < commentHeader - .getUserCommentLength(); i++) { - try { - long vectorLength = EndianUtils - .readSwappedUnsignedInteger(input); - String key = readContentVectorKey(input, - vectorLength).toLowerCase(); - boolean readValue = onContentVectorKey(key); - if (readValue) { - String value = readUTF8String( - input, - (int) (vectorLength - key.length() - 1)); - onContentVectorValue(key, value); - } else { - IOUtils.skipFully(input, - vectorLength - key.length() - 1); - } - } catch (IOException e) { - e.printStackTrace(); - } - } - onEndOfComment(); - } - - } else { - onError(new VorbisCommentReaderException( - "No comment header found")); - } - } else { - onNoVorbisCommentFound(); - } - } catch (IOException e) { - onError(new VorbisCommentReaderException(e)); - } - } - - private String readUTF8String(InputStream input, long length) - throws IOException { - byte[] buffer = new byte[(int) length]; - - IOUtils.readFully(input, buffer); - Charset charset = Charset.forName("UTF-8"); - return charset.newDecoder().decode(ByteBuffer.wrap(buffer)).toString(); - } - - /** - * Looks for an identification header in the first page of the file. If an - * identification header is found, it will be skipped completely and the - * method will return true, otherwise false. - * - * @throws IOException - */ - private boolean findIdentificationHeader(InputStream input) - throws IOException { - byte[] buffer = new byte[FIRST_PAGE_LENGTH]; - IOUtils.readFully(input, buffer); - int i; - for (i = 6; i < buffer.length; i++) { - if (buffer[i - 5] == 'v' && buffer[i - 4] == 'o' - && buffer[i - 3] == 'r' && buffer[i - 2] == 'b' - && buffer[i - 1] == 'i' && buffer[i] == 's' - && buffer[i - 6] == PACKET_TYPE_IDENTIFICATION) { - return true; - } - } - return false; - } - - private boolean findCommentHeader(InputStream input) throws IOException { - char[] buffer = new char["vorbis".length() + 1]; - for (int bytesRead = 0; bytesRead < SECOND_PAGE_MAX_LENGTH; bytesRead++) { - char c = (char) input.read(); - int dest = -1; - switch (c) { - case PACKET_TYPE_COMMENT: - dest = 0; - break; - case 'v': - dest = 1; - break; - case 'o': - dest = 2; - break; - case 'r': - dest = 3; - break; - case 'b': - dest = 4; - break; - case 'i': - dest = 5; - break; - case 's': - dest = 6; - break; - } - if (dest >= 0) { - buffer[dest] = c; - if (buffer[1] == 'v' && buffer[2] == 'o' && buffer[3] == 'r' - && buffer[4] == 'b' && buffer[5] == 'i' - && buffer[6] == 's' && buffer[0] == PACKET_TYPE_COMMENT) { - return true; - } - } else { - Arrays.fill(buffer, (char) 0); - } - } - return false; - } - - private VorbisCommentHeader readCommentHeader(InputStream input) - throws IOException, VorbisCommentReaderException { - try { - long vendorLength = EndianUtils.readSwappedUnsignedInteger(input); - String vendorName = readUTF8String(input, vendorLength); - long userCommentLength = EndianUtils - .readSwappedUnsignedInteger(input); - return new VorbisCommentHeader(vendorName, userCommentLength); - } catch (UnsupportedEncodingException e) { - throw new VorbisCommentReaderException(e); - } - } - - private String readContentVectorKey(InputStream input, long vectorLength) - throws IOException { - StringBuffer buffer = new StringBuffer(); - for (int i = 0; i < vectorLength; i++) { - char c = (char) input.read(); - if (c == '=') { - return buffer.toString(); - } else { - buffer.append(c); - } - } - return null; // no key found - } -} |