Imported Upstream version 5.4.0.167

Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa

mcs/class/Mono.Posix/Mono.Unix/UnixEncoding.cs

@@ -300,17 +300,35 @@ public class UnixEncoding : Encoding
 			throw new ArgumentOutOfRangeException ("byteIndex", _("ArgRange_Array"));
 		}
 
+		unsafe {
+			fixed (char* p = s) {
+				fixed (byte* b = bytes) {
+					return GetBytes (p + charIndex, charCount, b + byteIndex, bytes.Length - byteIndex);
+				}
+			}
+		}
+	}
+
+	public unsafe override int GetBytes(char* chars, int charCount, byte* bytes, int byteCount)
+	{
+		if (bytes == null || chars == null)
+			throw new ArgumentNullException (bytes == null ? "bytes" : "chars");
+
+		if (charCount < 0 || byteCount < 0)
+			throw new ArgumentOutOfRangeException (charCount < 0 ? "charCount" : "byteCount");
+			
 		// Convert the characters into bytes.
 		char ch;
-		int length = bytes.Length;
+		int length = byteCount;
 		uint pair;
-		int posn = byteIndex;
+		int posn = 0;
+		int charIndex = 0;
 		while (charCount > 0) {
 			// Fetch the next UTF-16 character pair value.
-			ch = s[charIndex++];
+			ch = chars [charIndex++];
 			if (ch >= '\uD800' && ch <= '\uDBFF' && charCount > 1) {
 				// This may be the start of a surrogate pair.
-				pair = (uint)(s[charIndex]);
+				pair = (uint)(chars[charIndex]);
 				if (pair >= (uint)0xDC00 && pair <= (uint)0xDFFF) {
 					pair = (pair - (uint)0xDC00) +
 						   ((((uint)ch) - (uint)0xD800) << 10) +
@@ -326,7 +344,7 @@ public class UnixEncoding : Encoding
 				}
 				charCount -= 2;
 				if (charCount >= 0) {
-					bytes[posn++] = (byte) s [charIndex++];
+					bytes[posn++] = (byte)chars [charIndex++];
 				}
 				continue;
 			} else {
@@ -365,7 +383,7 @@ public class UnixEncoding : Encoding
 		}
 
 		// Return the final count to the caller.
-		return posn - byteIndex;
+		return posn;
 	}
 
 	// Internal version of "GetCharCount" which can handle a rolling
@@ -394,7 +412,7 @@ public class UnixEncoding : Encoding
 		uint leftSoFar = (leftOverCount & (uint)0x0F);
 		uint leftSize = ((leftOverCount >> 4) & (uint)0x0F);
 		while (count > 0) {
-			ch = (uint)(bytes[index++]);
+			ch = (uint)(bytes [index++]);
 			++next_raw;
 			--count;
 			if (leftSize == 0) {