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The Labs \ Source Viewer \ SSCLI \ System.Globalization \ BaseInfoTable

SSCLI

// ==++==
//
//
//
// The use and distribution terms for this software are contained in the file
// named license.txt, which can be found in the root of this distribution.
// By using this software in any fashion, you are agreeing to be bound by the
// terms of this license.
//
// You must not remove this notice, or any other, from this software.
//
//
// ==--==
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 MemoryMapFile 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;
unsafe internal 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 assemlby.
//
////////////////////////////////////////////////////////////////////////
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
unsafe internal BaseInfoTable(string fileName, bool fromAssembly)
{
this.fileName = fileName;
this.fromAssembly = fromAssembly;
InitializeBaseInfoTablePointers(fileName, fromAssembly);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
unsafe internal void InitializeBaseInfoTablePointers(string fileName, bool fromAssembly)
{
if (fromAssembly) {
m_pDataFileStart = GlobalizationAssembly.GetGlobalizationResourceBytePtr(typeof(BaseInfoTable).Assembly, fileName);
}
else {
this.memoryMapFile = new MemoryMapFile(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; }
}
unsafe public override 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
//
////////////////////////////////////////////////////////////////////////
unsafe internal abstract void SetDataItemPointers();
////////////////////////////////////////////////////////////////////////
//
// Read a string from the string pool using the given string offset
//
////////////////////////////////////////////////////////////////////////
unsafe internal 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
//
////////////////////////////////////////////////////////////////////////
unsafe internal 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.
//
////////////////////////////////////////////////////////////////////////
unsafe internal 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.
//
////////////////////////////////////////////////////////////////////////
unsafe internal 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);
}
}
}