public void TestTwoItemsNoChange()
{
int[] expected = { 1, 1 };
byte[] data = { 0, 0, 0, 2, 1, 0 };
FingerprintDecompressor decompressor = new FingerprintDecompressor();
int algorithm = -1;
int[] actual = decompressor.Decompress(Base64.ByteEncoding.GetString(data), out algorithm);
Assert.AreEqual(0, algorithm);
CollectionAssert.AreEqual(actual, expected);
}
public void TestOneItemOneBitExcept2()
{
int[] expected = { 1 << 8 };
byte[] data = { 0, 0, 0, 1, 7, 2 };
FingerprintDecompressor decompressor = new FingerprintDecompressor();
int algorithm = -1;
int[] actual = decompressor.Decompress(Base64.ByteEncoding.GetString(data), out algorithm);
Assert.AreEqual(0, algorithm);
CollectionAssert.AreEqual(actual, expected);
}
public void TestOneItemThreeBits()
{
int[] expected = { 7 };
byte[] data = { 0, 0, 0, 1, 73, 0 };
FingerprintDecompressor decompressor = new FingerprintDecompressor();
int algorithm = -1;
int[] actual = decompressor.Decompress(Base64.ByteEncoding.GetString(data), ref algorithm);
Assert.AreEqual(0, algorithm);
CollectionAssert.AreEqual(actual, expected);
}
public void TestInvalid1()
{
byte[] data = { 0, 255, 255, 255 };
FingerprintDecompressor decompressor = new FingerprintDecompressor();
int algorithm = -1;
int[] value = decompressor.Decompress(Base64.ByteEncoding.GetString(data), out algorithm);
Assert.AreEqual(value.Length, 0);
Assert.AreEqual(0, algorithm);
}
public void TestLong()
{
int[] expected = { -587455133,-591649759,-574868448,-576973520,-543396544,1330439488,1326360000,1326355649,1191625921,1192674515,1194804466,1195336818,1165981042,1165956451,1157441379,1157441299,1291679571,1291673457,1170079601 };
string data = Base64.Decode("AQAAEwkjrUmSJQpUHflR9mjSJMdZpcO_Imdw9dCO9Clu4_wQPvhCB01w6xAtXNcAp5RASgDBhDSCGGIAcwA");
FingerprintDecompressor decompressor = new FingerprintDecompressor();
int algorithm = -1;
int[] value = decompressor.Decompress(data, out algorithm);
Assert.AreEqual(1, algorithm);
CollectionAssert.AreEqual(value, expected);
}
/// <summary>
/// Uncompress and optionally base64-decode an encoded fingerprint.
/// </summary>
/// <param name="encoded_fp">Pointer to an encoded fingerprint</param>
/// <param name="base64">Whether the encoded_fp parameter contains binary data or base64-encoded
/// ASCII data. If 1, it will base64-decode the data before uncompressing the fingerprint.</param>
/// <param name="algorithm">Chromaprint algorithm version which was used to generate the raw
/// fingerprint</param>
/// <returns>The decoded raw fingerprint (array of 32-bit integers)</returns>
public static int[] DecodeFingerprint(byte[] encoded_fp, bool base64, out int algorithm)
{
string encoded = Base64.ByteEncoding.GetString(encoded_fp);
string compressed = base64 ? Base64.Decode(encoded) : encoded;
algorithm = 0;
FingerprintDecompressor decompressor = new FingerprintDecompressor();
int[] uncompressed = decompressor.Decompress(compressed, ref algorithm);
int size = uncompressed.Length;
int[] fp = new int[size];
// TODO: copying necessary?
Array.Copy(uncompressed, fp, size);
return fp;
}
