Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Globalization / BaseInfoTable.cs / 2 / BaseInfoTable.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== namespace System.Globalization { using System; using System.Collections; using System.IO; using System.Runtime.Remoting; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using System.Threading; using System.Security.Permissions; using System.Runtime.Versioning; //////////////////////////////////////////////////////////////////////// // // Base class used to read NLS+ data tables for culture/region/calendar data // // // Data types supported in this version: // 0: WORD A WORD value. It is returend as signed int. The interpretation of sign is left to caller. // 1: String A string value. The first WORD is the size of the string. // 2: WORD[] A WORD array. The first DWORD is the size of the array, and it is followed by the DWORD values. // 3: String[] A string array. The first WORD is the size of the string array. And it is folowed by offsets to counted string values. // //////////////////////////////////////////////////////////////////////// internal abstract class BaseInfoTable { // The base pointer of the data table (beginning of the data file) unsafe internal byte* m_pDataFileStart; protected AgileSafeNativeMemoryHandle memoryMapFile = null; // The pointer to the main header unsafe protected CultureTableHeader* m_pCultureHeader; // The pointer to where the item data begins. unsafe internal byte* m_pItemData; // The total number of data items. internal uint m_numItem; // The size of each data item. This is the total size (in bytes) of each calendar or culture record. internal uint m_itemSize; internal unsafe ushort* m_pDataPool; // Where we came from internal bool fromAssembly; internal String fileName; protected bool m_valid = true; //private static String m_InternationalRegKey = "Control Panel\\International"; //////////////////////////////////////////////////////////////////////// // // Read the table and set up pointers pointing to different parts of // the table. // Parameters: // fromAssembly When true, we will load data table from mscorlib assembly. // //////////////////////////////////////////////////////////////////////// [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] internal unsafe BaseInfoTable(String fileName, bool fromAssembly) { this.fileName = fileName; this.fromAssembly = fromAssembly; InitializeBaseInfoTablePointers(fileName, fromAssembly); } [ResourceExposure(ResourceScope.Machine)] [ResourceConsumption(ResourceScope.Machine)] internal unsafe void InitializeBaseInfoTablePointers(String fileName, bool fromAssembly) { if (fromAssembly) { m_pDataFileStart = GlobalizationAssembly.GetGlobalizationResourceBytePtr(typeof(BaseInfoTable).Assembly, fileName); } else { this.memoryMapFile = new AgileSafeNativeMemoryHandle(fileName); if (this.memoryMapFile.FileSize == 0) { m_valid = false; return; } this.m_pDataFileStart = this.memoryMapFile.GetBytePtr(); } EndianessHeader* pEndianHeader = (EndianessHeader*)m_pDataFileStart; // Set up pointer to the CultureTableHeader #if BIGENDIAN BCLDebug.Assert(pEndianHeader->beOffset != 0, "Big-Endian data is expected."); m_pCultureHeader = (CultureTableHeader*)(m_pDataFileStart + pEndianHeader->beOffset); #else BCLDebug.Assert(pEndianHeader->leOffset != 0, "Little-Endian data is expected."); m_pCultureHeader = (CultureTableHeader*)(m_pDataFileStart + pEndianHeader->leOffset); #endif // Set up misc pointers and variables. // Different data items for calendar and culture, so they each have their own setting thingy. SetDataItemPointers(); } // // IsValid // tell if the current object is valid to use or not. note the only cases this object br invalid is // when we have corrupted custom culture file. // internal bool IsValid { get { return m_valid; } } public override unsafe bool Equals(Object value) { BaseInfoTable that = value as BaseInfoTable; return (that != null) && (this.fromAssembly == that.fromAssembly && CultureInfo.InvariantCulture.CompareInfo.Compare( this.fileName, that.fileName, CompareOptions.IgnoreCase ) == 0); } public override int GetHashCode() { return (this.fileName.GetHashCode()); } //////////////////////////////////////////////////////////////////////// // // Set Data Item Pointers that are unique to calendar or culture table // //////////////////////////////////////////////////////////////////////// internal abstract unsafe void SetDataItemPointers(); //////////////////////////////////////////////////////////////////////// // // Read a string from the string pool using the given string offset // //////////////////////////////////////////////////////////////////////// internal unsafe String GetStringPoolString(uint offset) { char* pCharValues = unchecked((char*)(m_pDataPool + offset)); // In the case of empty string, pCharValues[0] will have a size of 1, so we should check pCharValues[1] for empty string. if (pCharValues[1] == 0) return (String.Empty); return (new String(pCharValues + 1, 0, (int)pCharValues[0])); } //////////////////////////////////////////////////////////////////////// // // Read a string array from the pool using the given offset // //////////////////////////////////////////////////////////////////////// internal unsafe String[] GetStringArray(uint iOffset) { // If its empty return null if (iOffset == 0) return new String[0]; // The offset value is in char, and is related to the begining of string pool. ushort* pCount = m_pDataPool + iOffset; int count = (int)pCount[0]; // The number of strings in the array String[] values = new String[count]; // Get past count and cast to uint uint* pStringArray = (uint*)(pCount + 1); // Get our strings for (int i = 0; i < count; i++) values[i] = GetStringPoolString(pStringArray[i]); return (values); } //////////////////////////////////////////////////////////////////////// // // Return multiple WORD field arrays values for the specified data item in the data table. // The result is retured as an array of int since that's what most CI/NFI/DTFI properties return. // //////////////////////////////////////////////////////////////////////// internal unsafe int[][] GetWordArrayArray(uint iOffset) { // if its empty return null if (iOffset == 0) return new int[0][]; // The offset value is in char, and is related to the begining of string pool. // Need short* to get proper negative numbers for negative eras. short* pCount = (short*)(m_pDataPool + iOffset); int countArrays = (int)pCount[0]; // The number of word arrays in the array int[][] values = new int[countArrays][]; // Get past count and cast to uint to get the pointers to the word arrays uint* pWordArrays = (uint*)(pCount + 1); // Get our word arrays for (int i = 0; i < countArrays; i++) { pCount = (short*)(m_pDataPool + pWordArrays[i]); int count = pCount[0]; pCount++; // Advance past count and reuse for word pointer values[i] = new int[count]; for (int j = 0; j < count; j++) { values[i][j] = pCount[j]; } } return (values); } //////////////////////////////////////////////////////////////////////// // // Compare a managed string to a string pool using the given string offset. // Does binary comparisons. This is a bit better for perf. and reources than // creating a string object and making an f-call. // // Parameters // name: The name to be compared. // offset: an offset into the string table. // // Note // name should be in lowercase when this is called. // //////////////////////////////////////////////////////////////////////// internal unsafe int CompareStringToStringPoolStringBinary(String name, int offset) { int test = 0; char* pCharValues = unchecked((char*)(m_pDataPool + offset)); // In the case of empty string, pCharValues[0] will have a size of 1, so we should check pCharValues[1] for empty string. if (pCharValues[1] == 0) { if(name.Length == 0) { return (0); } return (1); } for(int i = 0; (i < (int)pCharValues[0]) && (i < name.Length); i++) { BCLDebug.Assert(!(name[i] >= 'A' && name[i] <= 'Z'), "name should be in lowercase"); // A little case insensitivity, for ASCII only. test = name[i] - ((pCharValues[i + 1] <= 'Z' && pCharValues[i + 1] >= 'A') ? (pCharValues[i + 1] + 'a' - 'A'): (pCharValues[i + 1])); if(test != 0) { break; } } return(test == 0 ? name.Length - (int)pCharValues[0] : test); } } }
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