1 files changed, 315 insertions, 0 deletions
diff --git a/src/mscorlib/corefx/System/Globalization/CompareInfo.Unix.cs b/src/mscorlib/corefx/System/Globalization/CompareInfo.Unix.cs
new file mode 100644
index 0000000000..2aaf5a22fa
--- /dev/null
+++ b/src/mscorlib/corefx/System/Globalization/CompareInfo.Unix.cs
@@ -0,0 +1,315 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Diagnostics.Contracts;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Security;
+
+namespace System.Globalization
+{
+    public partial class CompareInfo
+    {
+        [NonSerialized]
+        private Interop.GlobalizationInterop.SafeSortHandle _sortHandle;
+
+        [NonSerialized]
+        private bool _isAsciiEqualityOrdinal;
+
+        [SecuritySafeCritical]
+        internal CompareInfo(CultureInfo culture)
+        {
+            _name = culture.m_name;
+            InitSort(culture);
+        }
+
+        private void InitSort(CultureInfo culture)
+        {
+            _sortName = culture.SortName;
+            _sortHandle = Interop.GlobalizationInterop.GetSortHandle(GetNullTerminatedUtf8String(_sortName));
+            _isAsciiEqualityOrdinal = (_sortName == "en-US" || _sortName == "");
+        }
+
+        internal static unsafe int IndexOfOrdinal(string source, string value, int startIndex, int count, bool ignoreCase)
+        {
+            Contract.Assert(source != null);
+            Contract.Assert(value != null);
+
+            if (value.Length == 0)
+            {
+                return startIndex;
+            }
+
+            if (count < value.Length)
+            {
+                return -1;
+            }
+
+            if (ignoreCase)
+            {
+                fixed (char* pSource = source)
+                {
+                    int index = Interop.GlobalizationInterop.IndexOfOrdinalIgnoreCase(value, value.Length, pSource + startIndex, count, findLast: false);
+                    return index != -1 ?
+                        startIndex + index :
+                        -1;
+                }
+            }
+
+            int endIndex = startIndex + (count - value.Length);
+            for (int i = startIndex; i <= endIndex; i++)
+            {
+                int valueIndex, sourceIndex;
+
+                for (valueIndex = 0, sourceIndex = i;
+                     valueIndex < value.Length && source[sourceIndex] == value[valueIndex];
+                     valueIndex++, sourceIndex++) ;
+
+                if (valueIndex == value.Length)
+                {
+                    return i;
+                }
+            }
+
+            return -1;
+        }
+
+        internal static unsafe int LastIndexOfOrdinal(string source, string value, int startIndex, int count, bool ignoreCase)
+        {
+            Contract.Assert(source != null);
+            Contract.Assert(value != null);
+
+            if (value.Length == 0)
+            {
+                return startIndex;
+            }
+
+            if (count < value.Length)
+            {
+                return -1;
+            }
+
+            // startIndex is the index into source where we start search backwards from. 
+            // leftStartIndex is the index into source of the start of the string that is 
+            // count characters away from startIndex.
+            int leftStartIndex = startIndex - count + 1;
+
+            if (ignoreCase)
+            {
+                fixed (char* pSource = source)
+                {
+                    int lastIndex = Interop.GlobalizationInterop.IndexOfOrdinalIgnoreCase(value, value.Length, pSource + leftStartIndex, count, findLast: true);
+                    return lastIndex != -1 ?
+                        leftStartIndex + lastIndex :
+                        -1;
+                }
+            }
+
+            for (int i = startIndex - value.Length + 1; i >= leftStartIndex; i--)
+            {
+                int valueIndex, sourceIndex;
+
+                for (valueIndex = 0, sourceIndex = i;
+                     valueIndex < value.Length && source[sourceIndex] == value[valueIndex];
+                     valueIndex++, sourceIndex++) ;
+
+                if (valueIndex == value.Length) {
+                    return i;
+                }
+            }
+
+            return -1;
+        }
+
+        private int GetHashCodeOfStringCore(string source, CompareOptions options)
+        {
+            Contract.Assert(source != null);
+            Contract.Assert((options & (CompareOptions.Ordinal | CompareOptions.OrdinalIgnoreCase)) == 0);
+
+            return GetHashCodeOfStringCore(source, options, forceRandomizedHashing: false, additionalEntropy: 0);
+        }
+
+        private static unsafe int CompareStringOrdinalIgnoreCase(char* string1, int count1, char* string2, int count2)
+        {
+            return Interop.GlobalizationInterop.CompareStringOrdinalIgnoreCase(string1, count1, string2, count2);
+        }
+
+        private unsafe int CompareString(string string1, int offset1, int length1, string string2, int offset2, int length2, CompareOptions options)
+        {
+            Contract.Assert(string1 != null);
+            Contract.Assert(string2 != null);
+            Contract.Assert((options & (CompareOptions.Ordinal | CompareOptions.OrdinalIgnoreCase)) == 0);
+
+            fixed (char* pString1 = string1)
+            {
+                fixed (char* pString2 = string2)
+                {
+                    return Interop.GlobalizationInterop.CompareString(_sortHandle, pString1 + offset1, length1, pString2 + offset2, length2, options);
+                }
+            }
+        }
+
+        private unsafe int IndexOfCore(string source, string target, int startIndex, int count, CompareOptions options)
+        {
+            Contract.Assert(!string.IsNullOrEmpty(source));
+            Contract.Assert(target != null);
+            Contract.Assert((options & CompareOptions.OrdinalIgnoreCase) == 0);
+
+            if (target.Length == 0)
+            {
+                return startIndex;
+            }
+
+            if (options == CompareOptions.Ordinal)
+            {
+                return IndexOfOrdinal(source, target, startIndex, count, ignoreCase: false);
+            }
+
+            if (_isAsciiEqualityOrdinal && CanUseAsciiOrdinalForOptions(options) && source.IsFastSort() && target.IsFastSort())
+            {
+                return IndexOf(source, target, startIndex, count, GetOrdinalCompareOptions(options));
+            }
+
+            fixed (char* pSource = source)
+            {
+                int index = Interop.GlobalizationInterop.IndexOf(_sortHandle, target, target.Length, pSource + startIndex, count, options);
+
+                return index != -1 ? index + startIndex : -1;
+            }
+        }
+
+        private unsafe int LastIndexOfCore(string source, string target, int startIndex, int count, CompareOptions options)
+        {
+            Contract.Assert(!string.IsNullOrEmpty(source));
+            Contract.Assert(target != null);
+            Contract.Assert((options & CompareOptions.OrdinalIgnoreCase) == 0);
+
+            if (target.Length == 0)
+            {
+                return startIndex;
+            }
+
+            if (options == CompareOptions.Ordinal)
+            {
+                return LastIndexOfOrdinal(source, target, startIndex, count, ignoreCase: false);
+            }
+
+            if (_isAsciiEqualityOrdinal && CanUseAsciiOrdinalForOptions(options) && source.IsFastSort() && target.IsFastSort())
+            {
+                return LastIndexOf(source, target, startIndex, count, GetOrdinalCompareOptions(options));
+            }
+
+            // startIndex is the index into source where we start search backwards from. leftStartIndex is the index into source
+            // of the start of the string that is count characters away from startIndex.
+            int leftStartIndex = (startIndex - count + 1);
+
+            fixed (char* pSource = source)
+            {
+                int lastIndex = Interop.GlobalizationInterop.LastIndexOf(_sortHandle, target, target.Length, pSource + (startIndex - count + 1), count, options);
+
+                return lastIndex != -1 ? lastIndex + leftStartIndex : -1;
+            }
+        }
+
+        [SecuritySafeCritical]
+        private bool StartsWith(string source, string prefix, CompareOptions options)
+        {
+            Contract.Assert(!string.IsNullOrEmpty(source));
+            Contract.Assert(!string.IsNullOrEmpty(prefix));
+            Contract.Assert((options & (CompareOptions.Ordinal | CompareOptions.OrdinalIgnoreCase)) == 0);
+
+            if (_isAsciiEqualityOrdinal && CanUseAsciiOrdinalForOptions(options) && source.IsFastSort() && prefix.IsFastSort())
+            {
+                return IsPrefix(source, prefix, GetOrdinalCompareOptions(options));
+            }
+
+            return Interop.GlobalizationInterop.StartsWith(_sortHandle, prefix, prefix.Length, source, source.Length, options);
+        }
+
+        [SecuritySafeCritical]
+        private bool EndsWith(string source, string suffix, CompareOptions options)
+        {
+            Contract.Assert(!string.IsNullOrEmpty(source));
+            Contract.Assert(!string.IsNullOrEmpty(suffix));
+            Contract.Assert((options & (CompareOptions.Ordinal | CompareOptions.OrdinalIgnoreCase)) == 0);
+
+            if (_isAsciiEqualityOrdinal && CanUseAsciiOrdinalForOptions(options) && source.IsFastSort() && suffix.IsFastSort())
+            {
+                return IsSuffix(source, suffix, GetOrdinalCompareOptions(options));
+            }
+
+            return Interop.GlobalizationInterop.EndsWith(_sortHandle, suffix, suffix.Length, source, source.Length, options);
+        }
+
+        // -----------------------------
+        // ---- PAL layer ends here ----
+        // -----------------------------
+
+        [SecuritySafeCritical]
+        internal unsafe int GetHashCodeOfStringCore(string source, CompareOptions options, bool forceRandomizedHashing, long additionalEntropy)
+        {
+            Contract.Assert(source != null);
+            Contract.Assert((options & (CompareOptions.Ordinal | CompareOptions.OrdinalIgnoreCase)) == 0);
+
+            if (source.Length == 0)
+            {
+                return 0;
+            }
+
+            int sortKeyLength = Interop.GlobalizationInterop.GetSortKey(_sortHandle, source, source.Length, null, 0, options);
+
+            // As an optimization, for small sort keys we allocate the buffer on the stack.
+            if (sortKeyLength <= 256)
+            {
+                byte* pSortKey = stackalloc byte[sortKeyLength];
+                Interop.GlobalizationInterop.GetSortKey(_sortHandle, source, source.Length, pSortKey, sortKeyLength, options);
+                return InternalHashSortKey(pSortKey, sortKeyLength, false, additionalEntropy);
+            }
+
+            byte[] sortKey = new byte[sortKeyLength];
+
+            fixed(byte* pSortKey = sortKey)
+            {
+                Interop.GlobalizationInterop.GetSortKey(_sortHandle, source, source.Length, pSortKey, sortKeyLength, options);
+                return InternalHashSortKey(pSortKey, sortKeyLength, false, additionalEntropy);
+            }
+        }
+
+        [DllImport(JitHelpers.QCall)]
+        [SuppressUnmanagedCodeSecurity]
+        private static unsafe extern int InternalHashSortKey(byte* sortKey, int sortKeyLength, [MarshalAs(UnmanagedType.Bool)] bool forceRandomizedHashing, long additionalEntropy);
+
+        private static CompareOptions GetOrdinalCompareOptions(CompareOptions options)
+        {
+            if ((options & CompareOptions.IgnoreCase) == CompareOptions.IgnoreCase)
+            {
+                return CompareOptions.OrdinalIgnoreCase;
+            }
+            else
+            {
+                return CompareOptions.Ordinal;
+            }
+        }
+
+        private static bool CanUseAsciiOrdinalForOptions(CompareOptions options)
+        {
+            // Unlike the other Ignore options, IgnoreSymbols impacts ASCII characters (e.g. ').
+            return (options & CompareOptions.IgnoreSymbols) == 0;
+        }
+
+        private static byte[] GetNullTerminatedUtf8String(string s)
+        {
+            int byteLen = System.Text.Encoding.UTF8.GetByteCount(s);
+
+            // Allocate an extra byte (which defaults to 0) as the null terminator.
+            byte[] buffer = new byte[byteLen + 1];
+
+            int bytesWritten = System.Text.Encoding.UTF8.GetBytes(s, 0, s.Length, buffer, 0);
+
+            Contract.Assert(bytesWritten == byteLen);
+
+            return buffer;
+        }
+    }
+}