[System.Security.SecurityCritical] // auto-generated
private unsafe bool FindCodePage(int codePage)
{
Debug.Assert(m_codePageHeader != null && m_codePageHeader.Length == CODEPAGE_HEADER_SIZE, "m_codePageHeader expected to match in size the struct CodePageHeader");
// Loop through all of the m_pCodePageIndex[] items to find our code page
byte[] codePageIndex = new byte[sizeof(CodePageIndex)];
lock (s_streamLock)
{
// seek to the first CodePageIndex entry
s_codePagesEncodingDataStream.Seek(CODEPAGE_DATA_FILE_HEADER_SIZE, SeekOrigin.Begin);
int codePagesCount;
fixed(byte *pBytes = &s_codePagesDataHeader[0])
{
CodePageDataFileHeader *pDataHeader = (CodePageDataFileHeader *)pBytes;
codePagesCount = pDataHeader->CodePageCount;
}
fixed(byte *pBytes = &codePageIndex[0])
{
CodePageIndex *pCodePageIndex = (CodePageIndex *)pBytes;
for (int i = 0; i < codePagesCount; i++)
{
s_codePagesEncodingDataStream.Read(codePageIndex, 0, codePageIndex.Length);
if (pCodePageIndex->CodePage == codePage)
{
// Found it!
long position = s_codePagesEncodingDataStream.Position;
s_codePagesEncodingDataStream.Seek((long)pCodePageIndex->Offset, SeekOrigin.Begin);
s_codePagesEncodingDataStream.Read(m_codePageHeader, 0, m_codePageHeader.Length);
m_firstDataWordOffset = (int)s_codePagesEncodingDataStream.Position; // stream now pointing to the codepage data
if (i == codePagesCount - 1) // last codepage
{
m_dataSize = (int)(s_codePagesEncodingDataStream.Length - pCodePageIndex->Offset - m_codePageHeader.Length);
}
else
{
// Read Next codepage data to get the offset and then calculate the size
s_codePagesEncodingDataStream.Seek(position, SeekOrigin.Begin);
int currentOffset = pCodePageIndex->Offset;
s_codePagesEncodingDataStream.Read(codePageIndex, 0, codePageIndex.Length);
m_dataSize = pCodePageIndex->Offset - currentOffset - m_codePageHeader.Length;
}
return(true);
}
}
}
}
// Couldn't find it
return(false);
}
internal static unsafe EncodingInfo [] GetEncodings(CodePagesEncodingProvider provider)
{
lock (s_streamLock)
{
s_codePagesEncodingDataStream.Seek(CODEPAGE_DATA_FILE_HEADER_SIZE, SeekOrigin.Begin);
int codePagesCount;
fixed(byte *pBytes = &s_codePagesDataHeader[0])
{
CodePageDataFileHeader *pDataHeader = (CodePageDataFileHeader *)pBytes;
codePagesCount = pDataHeader->CodePageCount;
}
EncodingInfo [] encodingInfoList = new EncodingInfo[codePagesCount];
CodePageIndex codePageIndex = default;
Span <byte> pCodePageIndex = new Span <byte>(&codePageIndex, Unsafe.SizeOf <CodePageIndex>());
for (int i = 0; i < codePagesCount; i++)
{
s_codePagesEncodingDataStream.Read(pCodePageIndex);
string codePageName;
switch (codePageIndex.CodePage)
{
// Fixup some encoding names.
case 950: codePageName = "big5"; break;
case 10002: codePageName = "x-mac-chinesetrad"; break;
case 20833: codePageName = "x-ebcdic-koreanextended"; break;
default: codePageName = new string(&codePageIndex.CodePageName); break;
}
string?resourceName = EncodingNLS.GetLocalizedEncodingNameResource(codePageIndex.CodePage);
string?displayName = null;
if (resourceName != null && resourceName.StartsWith("Globalization_cp_", StringComparison.OrdinalIgnoreCase))
{
displayName = SR.GetResourceString(resourceName);
}
encodingInfoList[i] = new EncodingInfo(provider, codePageIndex.CodePage, codePageName, displayName ?? codePageName);
}
return(encodingInfoList);
}
}
[System.Security.SecurityCritical] // auto-generated
internal static unsafe int GetCodePageByteSize(int codePage)
{
// Loop through all of the m_pCodePageIndex[] items to find our code page
byte[] codePageIndex = new byte[sizeof(CodePageIndex)];
lock (s_streamLock)
{
// seek to the first CodePageIndex entry
s_codePagesEncodingDataStream.Seek(CODEPAGE_DATA_FILE_HEADER_SIZE, SeekOrigin.Begin);
int codePagesCount;
fixed(byte *pBytes = &s_codePagesDataHeader[0])
{
CodePageDataFileHeader *pDataHeader = (CodePageDataFileHeader *)pBytes;
codePagesCount = pDataHeader->CodePageCount;
}
fixed(byte *pBytes = &codePageIndex[0])
{
CodePageIndex *pCodePageIndex = (CodePageIndex *)pBytes;
for (int i = 0; i < codePagesCount; i++)
{
s_codePagesEncodingDataStream.Read(codePageIndex, 0, codePageIndex.Length);
if (pCodePageIndex->CodePage == codePage)
{
Debug.Assert(pCodePageIndex->ByteCount == 1 || pCodePageIndex->ByteCount == 2,
"[BaseCodePageEncoding] Code page (" + codePage + ") has invalid byte size (" + pCodePageIndex->ByteCount + ") in table");
// Return what it says for byte count
return(pCodePageIndex->ByteCount);
}
}
}
}
// Couldn't find it
return(0);
}
