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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Text;
using System.Runtime.Remoting;
using System;
using System.Security;
namespace System.Globalization
{
//
// Data item for EncodingTable. Along with EncodingTable, they are used by
// System.Text.Encoding.
//
// This class stores a pointer to the internal data and the index into that data
// where our required information is found. We load the code page, flags and uiFamilyCodePage
// immediately because they don't require creating an object. Creating any of the string
// names is delayed until somebody actually asks for them and the names are then cached.
[Serializable]
internal class CodePageDataItem
{
internal int m_dataIndex;
internal int m_uiFamilyCodePage;
internal String m_webName;
internal String m_headerName;
internal String m_bodyName;
internal uint m_flags;
unsafe internal CodePageDataItem(int dataIndex)
{
m_dataIndex = dataIndex;
m_uiFamilyCodePage = EncodingTable.codePageDataPtr[dataIndex].uiFamilyCodePage;
m_flags = EncodingTable.codePageDataPtr[dataIndex].flags;
}
unsafe internal static String CreateString(sbyte* pStrings, uint index)
{
if (pStrings[0] == '|') // |str1|str2|str3
{
int start = 1;
for (int i = 1; true; i++)
{
sbyte ch = pStrings[i];
if ((ch == '|') || (ch == 0))
{
if (index == 0)
{
return new String(pStrings, start, i - start);
}
index--;
start = i + 1;
if (ch == 0)
{
break;
}
}
}
throw new ArgumentException(null, nameof(pStrings));
}
else
{
return new String(pStrings);
}
}
unsafe public String WebName
{
get
{
if (m_webName == null)
{
m_webName = CreateString(EncodingTable.codePageDataPtr[m_dataIndex].Names, 0);
}
return m_webName;
}
}
public virtual int UIFamilyCodePage
{
get
{
return m_uiFamilyCodePage;
}
}
unsafe public String HeaderName
{
get
{
if (m_headerName == null)
{
m_headerName = CreateString(EncodingTable.codePageDataPtr[m_dataIndex].Names, 1);
}
return m_headerName;
}
}
unsafe public String BodyName
{
get
{
if (m_bodyName == null)
{
m_bodyName = CreateString(EncodingTable.codePageDataPtr[m_dataIndex].Names, 2);
}
return m_bodyName;
}
}
unsafe public uint Flags
{
get
{
return (m_flags);
}
}
}
}
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