public void DecoderPollShouldExpandShortSelfOverlappingBackref()
{
// "aaaaa" == (literal, 1), ('a'), (backref, 1 back, 4 bytes)
var input = new byte[] { 0xb0, 0x80, 0x01, 0x80 };
var output = new byte[6];
var expected = new byte[] { (byte)'a', (byte)'a', (byte)'a', (byte)'a', (byte)'a' };
var decoder = new HeatshrinkDecoder(256, 8, 7);
var sres = decoder.Sink(input, out var count);
Assert.AreEqual(DecoderSinkResult.Ok, sres);
decoder.Poll(output, out var outSz);
Assert.AreEqual(expected.Length, outSz);
for (int i = 0; i < expected.Length; ++i)
{
Assert.AreEqual(expected[i], output[i]);
}
}
public void DecoderPollShouldExpandShortLiteralAndBackref()
{
var input = new byte[] { 0xb3, 0x5b, 0xed, 0xe0, 0x41, 0x00 }; // "foofoo"
var output = new byte[6];
var decoder = new HeatshrinkDecoder(256, 7, 6);
var sres = decoder.Sink(input, out var count);
Assert.AreEqual(DecoderSinkResult.Ok, sres);
decoder.Poll(output, out var outSz);
Assert.AreEqual(6, outSz);
Assert.AreEqual((byte)'f', output[0]);
Assert.AreEqual((byte)'o', output[1]);
Assert.AreEqual((byte)'o', output[2]);
Assert.AreEqual((byte)'f', output[3]);
Assert.AreEqual((byte)'o', output[4]);
Assert.AreEqual((byte)'o', output[5]);
}
public void DecoderShouldNotGetStuckWithFinishYieldingMoreButZeroBytesOutputFromPoll()
{
var input = new byte[512];
for (var i = 0; i < 256; ++i)
{
input[i] = 0xff;
}
var decoder = new HeatshrinkDecoder(256, 8, 4);
/* Confirm that no byte of trailing context can lead to
* heatshrink_decoder_finish erroneously returning HSDR_FINISH_MORE
* when heatshrink_decoder_poll will yield 0 bytes.
*
* Before 0.3.1, a final byte of 0xFF could potentially cause
* this to happen, if at exactly the byte boundary. */
for (int b = 0; b < 256; ++b)
{
for (int i = 1; i < 512; ++i)
{
input[i] = (byte)b;
decoder.Reset();
var output = new byte[1024];
var sres = decoder.Sink(input, out var count);
Assert.AreEqual(DecoderSinkResult.Ok, sres);
var pres = decoder.Poll(output, out var outSz);
Assert.AreEqual(DecoderPollResult.Empty, pres);
var fres = decoder.Finish();
Assert.AreEqual(DecoderFinishResult.Done, fres);
input[i] = 0xff;
}
}
}
public void DecoderPollShouldExpandShortLiteralAndBackrefWhenFedInputByteByByte()
{
var input = new byte[] { 0xb3, 0x5b, 0xed, 0xe0, 0x41, 0x00 }; // "foofoo"
var output = new byte[7];
var decoder = new HeatshrinkDecoder(256, 7, 6);
for (var i = 0; i < 6; ++i)
{
var sres = decoder.Sink(input, i, 1, out var count);
Assert.AreEqual(DecoderSinkResult.Ok, sres);
}
var pres = decoder.Poll(output, out var outSz);
Assert.AreEqual(DecoderPollResult.Empty, pres);
Assert.AreEqual(6, outSz);
Assert.AreEqual((byte)'f', output[0]);
Assert.AreEqual((byte)'o', output[1]);
Assert.AreEqual((byte)'o', output[2]);
Assert.AreEqual((byte)'f', output[3]);
Assert.AreEqual((byte)'o', output[4]);
Assert.AreEqual((byte)'o', output[5]);
}
internal static void CompressAndExpandAndCheck(byte[] input, ConfigInfo cfg)
{
var encoder = new HeatshrinkEncoder(cfg.WindowSz, cfg.LookaheadSz);
var decoder = new HeatshrinkDecoder(cfg.DecoderInputBufferSize, cfg.WindowSz, cfg.LookaheadSz);
var inputSize = input.Length;
var compSz = inputSize + (inputSize / 2) + 4;
var decompSz = inputSize + (inputSize / 2) + 4;
var comp = new byte[compSz];
var decomp = new byte[decompSz];
if (cfg.LogLevel > 1)
{
Console.WriteLine("\n^^ COMPRESSING\n");
DumpBuf("input", input);
}
var sunk = 0;
var polled = 0;
while (sunk < inputSize)
{
var esres = encoder.Sink(input, sunk, inputSize - sunk, out var count);
Assert.IsTrue(esres >= 0);
sunk += count;
if (cfg.LogLevel > 1)
{
Console.WriteLine($"^^ sunk {count}");
}
if (sunk == inputSize)
{
Assert.AreEqual(EncoderFinishResult.More, encoder.Finish());
}
EncoderPollResult pres;
do
{
pres = encoder.Poll(comp, polled, compSz - polled, out count);
Assert.IsTrue(pres >= 0);
polled += count;
if (cfg.LogLevel > 1)
{
Console.WriteLine($"^^ polled {count}");
}
} while (pres == EncoderPollResult.More);
Assert.AreEqual(EncoderPollResult.Empty, pres);
if (polled >= compSz)
{
Assert.Fail("compression should never expand that much");
}
if (sunk == inputSize)
{
Assert.AreEqual(EncoderFinishResult.Done, encoder.Finish());
}
}
if (cfg.LogLevel > 0)
{
Console.Write($"in: {inputSize}, compressed: {polled} ");
}
var compressedSize = polled;
sunk = 0;
polled = 0;
if (cfg.LogLevel > 1)
{
Console.WriteLine("\n^^ DECOMPRESSING\n");
DumpBuf("comp", comp, compressedSize);
}
while (sunk < compressedSize)
{
Assert.IsTrue(decoder.Sink(comp, sunk, compressedSize - sunk, out var count) >= 0);
sunk += count;
if (cfg.LogLevel > 1)
{
Console.WriteLine($"^^ sunk {count}");
}
if (sunk == compressedSize)
{
Assert.AreEqual(DecoderFinishResult.More, decoder.Finish());
}
DecoderPollResult pres;
do
{
pres = decoder.Poll(decomp, polled, decompSz - polled, out count);
Assert.IsTrue(pres >= 0);
Assert.IsTrue(count > 0);
polled += count;
if (cfg.LogLevel > 1)
{
Console.WriteLine($"^^ polled: {count}");
}
} while (pres == DecoderPollResult.More);
Assert.AreEqual(DecoderPollResult.Empty, pres);
if (sunk == compressedSize)
{
var fres = decoder.Finish();
Assert.AreEqual(DecoderFinishResult.Done, fres);
}
if (polled > inputSize)
{
Console.WriteLine($"\nExpected: {inputSize}, got {polled}\n");
Assert.Fail("Decompressed data is larger than original input");
}
}
if (cfg.LogLevel > 0)
{
Console.WriteLine($"decompressed: {polled}");
}
if (polled != inputSize)
{
Assert.Fail("Decompressed length does not match original input length");
}
if (cfg.LogLevel > 1)
{
DumpBuf("decomp", decomp, polled);
}
for (var i = 0; i < inputSize; ++i)
{
if (input[i] != decomp[i])
{
Console.WriteLine($"*** mismatch at {i}");
}
Assert.AreEqual(input[i], decomp[i]);
}
}