protected unsafe byte *GetSharedMemory(int iSize)
{
// Build our name
String strName = GetMemorySectionName();
IntPtr mappedFileHandle;
// This gets shared memory for our map. If its can't, it gives us clean memory.
Byte *pMemorySection = EncodingTable.nativeCreateOpenFileMapping(strName, iSize, out mappedFileHandle);
Contract.Assert(pMemorySection != null,
"[BaseCodePageEncoding.GetSharedMemory] Expected non-null memory section to be opened");
// If that failed, we have to die.
if (pMemorySection == null)
{
throw new OutOfMemoryException(
Environment.GetResourceString("Arg_OutOfMemoryException"));
}
// if we have null file handle. this means memory was allocated after
// failing to open the mapped file.
if (mappedFileHandle != IntPtr.Zero)
{
safeMemorySectionHandle = new SafeViewOfFileHandle((IntPtr)pMemorySection, true);
safeFileMappingHandle = new SafeFileMappingHandle(mappedFileHandle, true);
}
return(pMemorySection);
}
// Returns an Encoding object for a given name or a given code page value.
//
/// <include file='doc\Encoding.uex' path='docs/doc[@for="Encoding.GetEncoding"]/*' />
public static Encoding GetEncoding(String name)
{
//
// NOTENOTE: If you add a new encoding that can be get by name, be sure to
// add the corresponding item in EncodingTable.
// Otherwise, the code below will throw exception when trying to call
// EncodingTable.GetCodePageFromName().
//
return(GetEncoding(EncodingTable.GetCodePageFromName(name)));
}
public override Encoding GetEncoding(string name)
{
int codepage = EncodingTable.GetCodePageFromName(name);
if (codepage == 0)
{
return(null);
}
return(GetEncoding(codepage));
}
private void GetDataItem()
{
if (dataItem == null)
{
dataItem = EncodingTable.GetCodePageDataItem(m_codePage);
if (dataItem == null)
{
throw new NotSupportedException(String.Format(Environment.GetResourceString("NotSupported_NoCodepageData"), m_codePage));
}
}
}
protected unsafe byte *GetSharedMemory(int iSize)
{
IntPtr ptr;
byte * numPtr = EncodingTable.nativeCreateOpenFileMapping(this.GetMemorySectionName(), iSize, out ptr);
if (numPtr == null)
{
throw new OutOfMemoryException(Environment.GetResourceString("Arg_OutOfMemoryException"));
}
if (ptr != IntPtr.Zero)
{
this.safeMemorySectionHandle = new SafeViewOfFileHandle((IntPtr)numPtr, true);
this.safeFileMappingHandle = new SafeFileMappingHandle(ptr, true);
}
return(numPtr);
}
protected unsafe byte *GetSharedMemory(int iSize)
{
IntPtr mappedFileHandle;
byte * openFileMapping = EncodingTable.nativeCreateOpenFileMapping(this.GetMemorySectionName(), iSize, out mappedFileHandle);
if ((IntPtr)openFileMapping == IntPtr.Zero)
{
throw new OutOfMemoryException(Environment.GetResourceString("Arg_OutOfMemoryException"));
}
if (mappedFileHandle != IntPtr.Zero)
{
this.safeMemorySectionHandle = new SafeViewOfFileHandle((IntPtr)((void *)openFileMapping), true);
this.safeFileMappingHandle = new SafeFileMappingHandle(mappedFileHandle, true);
}
return(openFileMapping);
}
Dictionary<char, int> ParseCmapTable(Stream stream, BinaryReader reader, TableHeader header)
{
stream.Position = header.Offset + 2;
int tableCount = reader.ReadUInt16();
var tableList = new List<EncodingTable>();
for (int i = 0; i < tableCount; i++)
{
var table = new EncodingTable()
{
PlatformId = reader.ReadUInt16(),
EncodingId = reader.ReadUInt16(),
Offset = reader.ReadUInt32(),
};
tableList.Add(table);
}
EncodingTable unicodeTable = tableList.Find(table => table.PlatformId == 3 && table.EncodingId == 1);
stream.Position = header.Offset + unicodeTable.Offset + 2;
int length = reader.ReadUInt16();
stream.Position += 2;
int segCount = reader.ReadUInt16() / 2;
stream.Position += 6;
var endCode = new int[segCount];
for (int i = 0; i < segCount; i++)
endCode[i] = reader.ReadUInt16();
stream.Position += 2;
var startCode = new int[segCount];
for (int i = 0; i < segCount; i++)
startCode[i] = reader.ReadUInt16();
var idDelta = new int[segCount];
for (int i = 0; i < segCount; i++)
idDelta[i] = reader.ReadInt16();
long offset = stream.Position;
var idRangeOffset = new int[segCount];
for (int i = 0; i < segCount; i++)
idRangeOffset[i] = reader.ReadUInt16();
var glyphDictionary = new Dictionary<char, int>();
for (int i = 0; i < segCount - 1; i++)
{
if (idRangeOffset[i] == 0)
{
for (int c = startCode[i]; c <= endCode[i]; c++)
glyphDictionary.Add((char)c, idDelta[i] + c);
}
else
{
for (int c = startCode[i]; c <= endCode[i]; c++)
{
stream.Position = idRangeOffset[i] + 2 * (c - startCode[i]) + offset + i * 2;
glyphDictionary.Add((char)c, idDelta[i] + reader.ReadUInt16());
}
}
}
return glyphDictionary;
}