Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / StringUtil.cs / 3 / StringUtil.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * StringUtil class * * Copyright (c) 1999 Microsoft Corporation */ namespace System.Web.Util { using System.Text; using System.Globalization; using System.Runtime.InteropServices; /* * Various string handling utilities */ internal static class StringUtil { internal static string CheckAndTrimString(string paramValue, string paramName) { return CheckAndTrimString(paramValue, paramName, true); } internal static string CheckAndTrimString(string paramValue, string paramName, bool throwIfNull) { return CheckAndTrimString(paramValue, paramName, throwIfNull, -1); } internal static string CheckAndTrimString(string paramValue, string paramName, bool throwIfNull, int lengthToCheck) { if (paramValue == null) { if (throwIfNull) { throw new ArgumentNullException(paramName); } return null; } string trimmedValue = paramValue.Trim(); if (trimmedValue.Length == 0) { throw new ArgumentException( SR.GetString(SR.PersonalizationProviderHelper_TrimmedEmptyString, paramName)); } if (lengthToCheck > -1 && trimmedValue.Length > lengthToCheck) { throw new ArgumentException( SR.GetString(SR.StringUtil_Trimmed_String_Exceed_Maximum_Length, paramValue, paramName, lengthToCheck.ToString(CultureInfo.InvariantCulture))); } return trimmedValue; } internal static bool Equals(string s1, string s2) { if (s1 == s2) { return true; } if (String.IsNullOrEmpty(s1) && String.IsNullOrEmpty(s2)) { return true; } return false; } internal static bool EqualsIgnoreCase(string s1, string s2) { if (String.IsNullOrEmpty(s1) && String.IsNullOrEmpty(s2)) { return true; } if (String.IsNullOrEmpty(s1) || String.IsNullOrEmpty(s2)) { return false; } if(s2.Length != s1.Length) { return false; } return 0 == string.Compare(s1, 0, s2, 0, s2.Length, StringComparison.OrdinalIgnoreCase); } internal static bool EqualsIgnoreCase(string s1, int index1, string s2, int index2, int length) { return String.Compare(s1, index1, s2, index2, length, StringComparison.OrdinalIgnoreCase) == 0; } internal static string StringFromWCharPtr(IntPtr ip, int length) { unsafe { return new string((char *) ip, 0, length); } } internal static string StringFromCharPtr(IntPtr ip, int length) { return Marshal.PtrToStringAnsi(ip, length); } /* * Determines if the string ends with the specified character. * Fast, non-culture aware. */ internal static bool StringEndsWith(string s, char c) { int len = s.Length; return len != 0 && s[len - 1] == c; } /* * Determines if the first string ends with the second string. * Fast, non-culture aware. */ unsafe internal static bool StringEndsWith(string s1, string s2) { int offset = s1.Length - s2.Length; if (offset < 0) { return false; } fixed (char * pch1=s1, pch2=s2) { char * p1 = pch1 + offset, p2=pch2; int c = s2.Length; while (c-- > 0) { if (*p1++ != *p2++) return false; } } return true; } /* * Determines if the first string ends with the second string, ignoring case. * Fast, non-culture aware. */ internal static bool StringEndsWithIgnoreCase(string s1, string s2) { int offset = s1.Length - s2.Length; if (offset < 0) { return false; } return 0 == string.Compare(s1, offset, s2, 0, s2.Length, StringComparison.OrdinalIgnoreCase); } /* * Determines if the string starts with the specified character. * Fast, non-culture aware. */ internal static bool StringStartsWith(string s, char c) { return s.Length != 0 && (s[0] == c); } /* * Determines if the first string starts with the second string. * Fast, non-culture aware. */ unsafe internal static bool StringStartsWith(string s1, string s2) { if (s2.Length > s1.Length) { return false; } fixed (char * pch1=s1, pch2=s2) { char * p1 = pch1, p2=pch2; int c = s2.Length; while (c-- > 0) { if (*p1++ != *p2++) return false; } } return true; } /* * Determines if the first string starts with the second string, ignoring case. * Fast, non-culture aware. */ internal static bool StringStartsWithIgnoreCase(string s1, string s2) { if (String.IsNullOrEmpty(s1) || String.IsNullOrEmpty(s2)) { return false; } if (s2.Length > s1.Length) { return false; } return 0 == string.Compare(s1, 0, s2, 0, s2.Length, StringComparison.OrdinalIgnoreCase); } internal unsafe static void UnsafeStringCopy(string src, int srcIndex, char[] dest, int destIndex, int len) { // We do not verify the parameters in this function, as the callers are assumed // to have done so. This is important for users such as HttpWriter that already // do the argument checking, and are called several times per request. Debug.Assert(len >= 0, "len >= 0"); Debug.Assert(src != null, "src != null"); Debug.Assert(srcIndex >= 0, "srcIndex >= 0"); Debug.Assert(srcIndex + len <= src.Length, "src"); Debug.Assert(dest != null, "dest != null"); Debug.Assert(destIndex >= 0, "destIndex >= 0"); Debug.Assert(destIndex + len <= dest.Length, "dest"); int cb = len * sizeof(char); fixed (char * pchSrc = src, pchDest = dest) { byte* pbSrc = (byte *) (pchSrc + srcIndex); byte* pbDest = (byte*) (pchDest + destIndex); memcpyimpl(pbSrc, pbDest, cb); } } internal static bool StringArrayEquals(string[] a, string [] b) { if ((a == null) != (b == null)) { return false; } if (a == null) { return true; } int n = a.Length; if (n != b.Length) { return false; } for (int i = 0; i < n; i++) { if (a[i] != b[i]) { return false; } } return true; } // This is copied from String.GetHashCode. We want our own copy, because the result of // String.GetHashCode is not guaranteed to be the same from build to build. But we want a // stable hash, since we persist things to disk (e.g. precomp scenario). VSWhidbey 399279. internal static int GetStringHashCode(string s) { unsafe { fixed (char* src = s) { int hash1 = (5381 << 16) + 5381; int hash2 = hash1; // 32bit machines. int* pint = (int*)src; int len = s.Length; while (len > 0) { hash1 = ((hash1 << 5) + hash1 + (hash1 >> 27)) ^ pint[0]; if (len <= 2) { break; } hash2 = ((hash2 << 5) + hash2 + (hash2 >> 27)) ^ pint[1]; pint += 2; len -= 4; } return hash1 + (hash2 * 1566083941); } } } internal unsafe static void memcpyimpl(byte* src, byte* dest, int len) { Debug.Assert(len >= 0, "Negative length in memcpyimpl!"); #if FEATURE_PAL // Portable naive implementation while (len-- > 0) *dest++ = *src++; #else #if IA64 long dstAlign = (7 & (8 - (((long)dest) & 7))); // number of bytes to copy before dest is 8-byte aligned while ((dstAlign > 0) && (len > 0)) { // < *dest++ = *src++; len--; dstAlign--; } if (len > 0) { long srcAlign = 8 - (((long)src) & 7); if (srcAlign != 8) { if (4 == srcAlign) { while (len >= 4) { ((int*)dest)[0] = ((int*)src)[0]; dest += 4; src += 4; len -= 4; } srcAlign = 2; // fall through to 2-byte copies } if ((2 == srcAlign) || (6 == srcAlign)) { while (len >= 2) { ((short*)dest)[0] = ((short*)src)[0]; dest += 2; src += 2; len -= 2; } } while (len-- > 0) { *dest++ = *src++; } } else { if (len >= 16) { do { ((long*)dest)[0] = ((long*)src)[0]; ((long*)dest)[1] = ((long*)src)[1]; dest += 16; src += 16; } while ((len -= 16) >= 16); } if(len > 0) // protection against negative len and optimization for len==16*N { if ((len & 8) != 0) { ((long*)dest)[0] = ((long*)src)[0]; dest += 8; src += 8; } if ((len & 4) != 0) { ((int*)dest)[0] = ((int*)src)[0]; dest += 4; src += 4; } if ((len & 2) != 0) { ((short*)dest)[0] = ((short*)src)[0]; dest += 2; src += 2; } if ((len & 1) != 0) { *dest++ = *src++; } } } } #else //This is Peter Sollich's faster memcpy implementation, from // COMString.cpp. For our strings, this beat the processor's // repeat & move single byte instruction, which memcpy expands into. // (You read that correctly.) // This is 3x faster than a simple while loop copying byte by byte, // for large copies. if (len >= 16) { do { #if AMD64 ((long*)dest)[0] = ((long*)src)[0]; ((long*)dest)[1] = ((long*)src)[1]; #else ((int*)dest)[0] = ((int*)src)[0]; ((int*)dest)[1] = ((int*)src)[1]; ((int*)dest)[2] = ((int*)src)[2]; ((int*)dest)[3] = ((int*)src)[3]; #endif dest += 16; src += 16; } while ((len -= 16) >= 16); } if(len > 0) // protection against negative len and optimization for len==16*N { if ((len & 8) != 0) { #if AMD64 ((long*)dest)[0] = ((long*)src)[0]; #else ((int*)dest)[0] = ((int*)src)[0]; ((int*)dest)[1] = ((int*)src)[1]; #endif dest += 8; src += 8; } if ((len & 4) != 0) { ((int*)dest)[0] = ((int*)src)[0]; dest += 4; src += 4; } if ((len & 2) != 0) { ((short*)dest)[0] = ((short*)src)[0]; dest += 2; src += 2; } if ((len & 1) != 0) *dest++ = *src++; } #endif #endif // FEATURE_PAL } internal static string[] ObjectArrayToStringArray(object[] objectArray) { String[] stringKeys = new String[objectArray.Length]; objectArray.CopyTo(stringKeys, 0); return stringKeys; } } }
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