public unsafe void DefaultDecodingFallbackMatchesBcl()
{
byte[] buffer;
int bytesRead;
var decoder = MetadataStringDecoder.DefaultUTF8;
// dangling lead byte
fixed (byte* ptr = (buffer = new byte[] { 0xC0 }))
{
string s = new MemoryBlock(ptr, buffer.Length).PeekUtf8NullTerminated(0, null, decoder, out bytesRead);
Assert.Equal("\uFFFD", new MemoryBlock(ptr, buffer.Length).PeekUtf8NullTerminated(0, null, decoder, out bytesRead));
Assert.Equal(s, Encoding.UTF8.GetString(buffer));
Assert.Equal(buffer.Length, bytesRead);
s = new MemoryBlock(ptr, buffer.Length).PeekUtf8NullTerminated(0, Encoding.UTF8.GetBytes("Hello"), decoder, out bytesRead);
Assert.Equal("Hello\uFFFD", s);
Assert.Equal(s, "Hello" + Encoding.UTF8.GetString(buffer));
Assert.Equal(buffer.Length, bytesRead);
Assert.Equal("\uFFFD", new MemoryBlock(ptr, buffer.Length).PeekUtf8(0, buffer.Length));
}
// overlong encoding
fixed (byte* ptr = (buffer = new byte[] { (byte)'a', 0xC0, 0xAF, (byte)'b', 0x0 }))
{
var block = new MemoryBlock(ptr, buffer.Length);
Assert.Equal("a\uFFFD\uFFFDb", block.PeekUtf8NullTerminated(0, null, decoder, out bytesRead));
Assert.Equal(buffer.Length, bytesRead);
}
// TODO: There are a bunch more error cases of course, but this is enough to break the old code
// and we now just call the BCL, so from a white box perspective, we needn't get carried away.
}
public unsafe void ReadFromMemoryBlock()
{
byte[] buffer = new byte[4] { 0, 1, 0, 2 };
fixed (byte* bufferPtr = buffer)
{
var block = new MemoryBlock(bufferPtr, buffer.Length);
Assert.Throws<BadImageFormatException>(() => block.PeekUInt32(Int32.MaxValue));
Assert.Throws<BadImageFormatException>(() => block.PeekUInt32(-1));
Assert.Throws<BadImageFormatException>(() => block.PeekUInt32(Int32.MinValue));
Assert.Throws<BadImageFormatException>(() => block.PeekUInt32(4));
Assert.Throws<BadImageFormatException>(() => block.PeekUInt32(1));
Assert.Equal(0x02000100U, block.PeekUInt32(0));
Assert.Throws<BadImageFormatException>(() => block.PeekUInt16(Int32.MaxValue));
Assert.Throws<BadImageFormatException>(() => block.PeekUInt16(-1));
Assert.Throws<BadImageFormatException>(() => block.PeekUInt16(Int32.MinValue));
Assert.Throws<BadImageFormatException>(() => block.PeekUInt16(4));
Assert.Equal(0x0200, block.PeekUInt16(2));
int bytesRead;
MetadataStringDecoder stringDecoder = MetadataStringDecoder.DefaultUTF8;
Assert.Throws<BadImageFormatException>(() => block.PeekUtf8NullTerminated(Int32.MaxValue, null, stringDecoder, out bytesRead));
Assert.Throws<BadImageFormatException>(() => block.PeekUtf8NullTerminated(-1, null, stringDecoder, out bytesRead));
Assert.Throws<BadImageFormatException>(() => block.PeekUtf8NullTerminated(Int32.MinValue, null, stringDecoder, out bytesRead));
Assert.Throws<BadImageFormatException>(() => block.PeekUtf8NullTerminated(5, null, stringDecoder, out bytesRead));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(-1, 1));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(1, -1));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(0, -1));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(-1, 0));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(-Int32.MaxValue, Int32.MaxValue));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(Int32.MaxValue, -Int32.MaxValue));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(Int32.MaxValue, Int32.MaxValue));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(block.Length, -1));
Assert.Throws<BadImageFormatException>(() => block.GetMemoryBlockAt(-1, block.Length));
Assert.Equal("\u0001", block.PeekUtf8NullTerminated(1, null, stringDecoder, out bytesRead));
Assert.Equal(bytesRead, 2);
Assert.Equal("\u0002", block.PeekUtf8NullTerminated(3, null, stringDecoder, out bytesRead));
Assert.Equal(bytesRead, 1);
Assert.Equal("", block.PeekUtf8NullTerminated(4, null, stringDecoder, out bytesRead));
Assert.Equal(bytesRead, 0);
byte[] helloPrefix = Encoding.UTF8.GetBytes("Hello");
Assert.Equal("Hello\u0001", block.PeekUtf8NullTerminated(1, helloPrefix, stringDecoder, out bytesRead));
Assert.Equal(bytesRead, 2);
Assert.Equal("Hello\u0002", block.PeekUtf8NullTerminated(3, helloPrefix, stringDecoder, out bytesRead));
Assert.Equal(bytesRead, 1);
Assert.Equal("Hello", block.PeekUtf8NullTerminated(4, helloPrefix, stringDecoder, out bytesRead));
Assert.Equal(bytesRead, 0);
}
}