public unsafe static string GetAsciiString(this MemoryPoolIterator start, MemoryPoolIterator end)
{
if (start.IsDefault || end.IsDefault)
{
return(null);
}
var length = start.GetLength(end);
if (length == 0)
{
return(null);
}
var inputOffset = start.Index;
var block = start.Block;
var asciiString = new string('\0', length);
fixed(char *outputStart = asciiString)
{
var output = outputStart;
var remaining = length;
var endBlock = end.Block;
var endIndex = end.Index;
var outputOffset = 0;
while (true)
{
int following = (block != endBlock ? block.End : endIndex) - inputOffset;
if (following > 0)
{
if (!AsciiUtilities.TryGetAsciiString(block.DataFixedPtr + inputOffset, output + outputOffset, following))
{
throw new BadHttpRequestException("The input string contains non-ASCII or null characters.");
}
outputOffset += following;
remaining -= following;
}
if (remaining == 0)
{
break;
}
block = block.Next;
inputOffset = block.Start;
}
}
return(asciiString);
}
public static ArraySegment <byte> GetArraySegment(this MemoryPoolIterator start, MemoryPoolIterator end)
{
if (start.IsDefault || end.IsDefault)
{
return(default(ArraySegment <byte>));
}
if (end.Block == start.Block)
{
return(new ArraySegment <byte>(start.Block.Array, start.Index, end.Index - start.Index));
}
var length = start.GetLength(end);
var array = new byte[length];
start.CopyTo(array, 0, length, out length);
return(new ArraySegment <byte>(array, 0, length));
}
public static string GetUtf8String(this MemoryPoolIterator start, MemoryPoolIterator end)
{
if (start.IsDefault || end.IsDefault)
{
return(default(string));
}
if (end.Block == start.Block)
{
return(_utf8.GetString(start.Block.Array, start.Index, end.Index - start.Index));
}
var decoder = _utf8.GetDecoder();
var length = start.GetLength(end);
var charLength = length * 2;
var chars = new char[charLength];
var charIndex = 0;
var block = start.Block;
var index = start.Index;
var remaining = length;
while (true)
{
int bytesUsed;
int charsUsed;
bool completed;
var following = block.End - index;
if (remaining <= following)
{
decoder.Convert(
block.Array,
index,
remaining,
chars,
charIndex,
charLength - charIndex,
true,
out bytesUsed,
out charsUsed,
out completed);
return(new string(chars, 0, charIndex + charsUsed));
}
else if (block.Next == null)
{
decoder.Convert(
block.Array,
index,
following,
chars,
charIndex,
charLength - charIndex,
true,
out bytesUsed,
out charsUsed,
out completed);
return(new string(chars, 0, charIndex + charsUsed));
}
else
{
decoder.Convert(
block.Array,
index,
following,
chars,
charIndex,
charLength - charIndex,
false,
out bytesUsed,
out charsUsed,
out completed);
charIndex += charsUsed;
remaining -= following;
block = block.Next;
index = block.Start;
}
}
}
