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package de.danoeh.antennapod.parser.media.id3;
import de.danoeh.antennapod.parser.media.id3.model.FrameHeader;
import de.danoeh.antennapod.parser.media.id3.model.TagHeader;
import org.apache.commons.io.input.CountingInputStream;
import org.junit.Test;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
public class Id3ReaderTest {
@Test
public void testReadString() throws IOException {
byte[] data = {
ID3Reader.ENCODING_ISO,
'T', 'e', 's', 't',
0 // Null-terminated
};
CountingInputStream inputStream = new CountingInputStream(new ByteArrayInputStream(data));
String string = new ID3Reader(inputStream).readEncodingAndString(1000);
assertEquals("Test", string);
}
@Test
public void testReadMultipleStrings() throws IOException {
byte[] data = {
ID3Reader.ENCODING_ISO,
'F', 'o', 'o',
0, // Null-terminated
ID3Reader.ENCODING_ISO,
'B', 'a', 'r',
0 // Null-terminated
};
CountingInputStream inputStream = new CountingInputStream(new ByteArrayInputStream(data));
ID3Reader reader = new ID3Reader(inputStream);
assertEquals("Foo", reader.readEncodingAndString(1000));
assertEquals("Bar", reader.readEncodingAndString(1000));
}
@Test
public void testReadingLimit() throws IOException {
byte[] data = {
ID3Reader.ENCODING_ISO,
'A', 'B', 'C', 'D'
};
CountingInputStream inputStream = new CountingInputStream(new ByteArrayInputStream(data));
ID3Reader reader = new ID3Reader(inputStream);
assertEquals("ABC", reader.readEncodingAndString(4)); // Includes encoding
assertEquals('D', reader.readByte());
}
@Test
public void testReadUtf16RespectsBom() throws IOException {
byte[] data = {
ID3Reader.ENCODING_UTF16_WITH_BOM,
(byte) 0xff, (byte) 0xfe, // BOM: Little-endian
'A', 0, 'B', 0, 'C', 0,
0, 0, // Null-terminated
ID3Reader.ENCODING_UTF16_WITH_BOM,
(byte) 0xfe, (byte) 0xff, // BOM: Big-endian
0, 'D', 0, 'E', 0, 'F',
0, 0, // Null-terminated
};
CountingInputStream inputStream = new CountingInputStream(new ByteArrayInputStream(data));
ID3Reader reader = new ID3Reader(inputStream);
assertEquals("ABC", reader.readEncodingAndString(1000));
assertEquals("DEF", reader.readEncodingAndString(1000));
}
@Test
public void testReadUtf16NullPrefix() throws IOException {
byte[] data = {
ID3Reader.ENCODING_UTF16_WITH_BOM,
(byte) 0xff, (byte) 0xfe, // BOM
0x00, 0x01, // Latin Capital Letter A with macron (Ā)
0, 0, // Null-terminated
};
CountingInputStream inputStream = new CountingInputStream(new ByteArrayInputStream(data));
String string = new ID3Reader(inputStream).readEncodingAndString(1000);
assertEquals("Ā", string);
}
@Test
public void testReadingLimitUtf16() throws IOException {
byte[] data = {
ID3Reader.ENCODING_UTF16_WITHOUT_BOM,
'A', 0, 'B', 0, 'C', 0, 'D', 0
};
CountingInputStream inputStream = new CountingInputStream(new ByteArrayInputStream(data));
ID3Reader reader = new ID3Reader(inputStream);
reader.readEncodingAndString(6); // Includes encoding, produces broken string
assertTrue("Should respect limit even if it breaks a symbol", reader.getPosition() <= 6);
}
@Test
public void testReadTagHeader() throws IOException, ID3ReaderException {
byte[] data = generateId3Header(23);
CountingInputStream inputStream = new CountingInputStream(new ByteArrayInputStream(data));
TagHeader header = new ID3Reader(inputStream).readTagHeader();
assertEquals("ID3", header.getId());
assertEquals(42, header.getVersion());
assertEquals(23, header.getSize());
}
@Test
public void testReadFrameHeader() throws IOException {
byte[] data = generateFrameHeader("CHAP", 42);
CountingInputStream inputStream = new CountingInputStream(new ByteArrayInputStream(data));
FrameHeader header = new ID3Reader(inputStream).readFrameHeader();
assertEquals("CHAP", header.getId());
assertEquals(42, header.getSize());
}
public static byte[] generateFrameHeader(String id, int size) {
return concat(
id.getBytes(StandardCharsets.ISO_8859_1), // Frame ID
new byte[] {
(byte) (size >> 24), (byte) (size >> 16),
(byte) (size >> 8), (byte) (size), // Size
0, 0 // Flags
});
}
static byte[] generateId3Header(int size) {
return new byte[] {
'I', 'D', '3', // Identifier
0, 42, // Version
0, // Flags
(byte) (size >> 24), (byte) (size >> 16),
(byte) (size >> 8), (byte) (size), // Size
};
}
static byte[] concat(byte[]... arrays) {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
try {
for (byte[] array : arrays) {
outputStream.write(array);
}
} catch (IOException e) {
fail(e.getMessage());
}
return outputStream.toByteArray();
}
}
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