BaseInfoTable.cs source code in C# .NET

Source code for the .NET framework in C#

                        
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                         / 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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