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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.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.Contracts;
using System.Text;
namespace System.Globalization
{
internal static class EncodingTable
{
// Return a list of all EncodingInfo objects describing all of our encodings
internal static EncodingInfo[] GetEncodings()
{
EncodingInfo[] arrayEncodingInfo = new EncodingInfo[s_encodingDataTableItems.Length];
for (int i = 0; i < s_encodingDataTableItems.Length; i++)
{
CodePageDataItem dataItem = s_encodingDataTableItems[i];
arrayEncodingInfo[i] = new EncodingInfo(dataItem.CodePage, dataItem.WebName,
SR.GetResourceString(dataItem.DisplayNameResourceKey));
}
return arrayEncodingInfo;
}
internal static int GetCodePageFromName(string name)
{
if (name == null)
{
throw new ArgumentNullException(nameof(name));
}
Contract.EndContractBlock();
ushort codePage;
if (s_encodingDataTable.TryGetValue(name, out codePage))
{
return codePage;
}
// The encoding name is not valid.
throw new ArgumentException(
string.Format(
CultureInfo.CurrentCulture,
SR.Argument_EncodingNotSupported, name), nameof(name));
}
internal static CodePageDataItem GetCodePageDataItem(int codepage)
{
CodePageDataItem item;
switch (codepage)
{
case 1200:
item = s_encodingDataTableItems[0];
break;
case 1201:
item = s_encodingDataTableItems[1];
break;
case 12000:
item = s_encodingDataTableItems[2];
break;
case 12001:
item = s_encodingDataTableItems[3];
break;
case 20127:
item = s_encodingDataTableItems[4];
break;
case 28591:
item = s_encodingDataTableItems[5];
break;
case 65000:
item = s_encodingDataTableItems[6];
break;
case 65001:
item = s_encodingDataTableItems[7];
break;
default:
item = null;
break;
}
Debug.Assert(item == null || item.CodePage == codepage, "item.CodePage needs to equal the specified codepage");
return item;
}
// PAL ends here.
#if DEBUG
static EncodingTable()
{
Debug.Assert(
s_encodingDataTable.Count == EncodingTableCapacity,
string.Format(CultureInfo.InvariantCulture,
"EncodingTable s_encodingDataTable's initial capacity (EncodingTableCapacity) is incorrect.{0}Expected (s_encodingDataTable.Count): {1}, Actual (EncodingTableCapacity): {2}",
Environment.NewLine,
s_encodingDataTable.Count,
EncodingTableCapacity));
}
#endif
// NOTE: the following two lists were taken from ~\src\classlibnative\nls\encodingdata.cpp
// and should be kept in sync with those lists
private const int EncodingTableCapacity = 42;
private readonly static Dictionary<string, ushort> s_encodingDataTable =
new Dictionary<string, ushort>(EncodingTableCapacity, StringComparer.OrdinalIgnoreCase)
{
{ "ANSI_X3.4-1968", 20127 },
{ "ANSI_X3.4-1986", 20127 },
{ "ascii", 20127 },
{ "cp367", 20127 },
{ "cp819", 28591 },
{ "csASCII", 20127 },
{ "csISOLatin1", 28591 },
{ "csUnicode11UTF7", 65000 },
{ "IBM367", 20127 },
{ "ibm819", 28591 },
{ "ISO-10646-UCS-2", 1200 },
{ "iso-8859-1", 28591 },
{ "iso-ir-100", 28591 },
{ "iso-ir-6", 20127 },
{ "ISO646-US", 20127 },
{ "iso8859-1", 28591 },
{ "ISO_646.irv:1991", 20127 },
{ "iso_8859-1", 28591 },
{ "iso_8859-1:1987", 28591 },
{ "l1", 28591 },
{ "latin1", 28591 },
{ "ucs-2", 1200 },
{ "unicode", 1200},
{ "unicode-1-1-utf-7", 65000 },
{ "unicode-1-1-utf-8", 65001 },
{ "unicode-2-0-utf-7", 65000 },
{ "unicode-2-0-utf-8", 65001 },
// People get confused about the FFFE here. We can't change this because it'd break existing apps.
// This has been this way for a long time, including in Mlang.
// Big Endian, BOM seems backwards, think of the BOM in little endian order.
{ "unicodeFFFE", 1201},
{ "us", 20127 },
{ "us-ascii", 20127 },
{ "utf-16", 1200 },
{ "UTF-16BE", 1201},
{ "UTF-16LE", 1200},
{ "utf-32", 12000 },
{ "UTF-32BE", 12001 },
{ "UTF-32LE", 12000 },
{ "utf-7", 65000 },
{ "utf-8", 65001 },
{ "x-unicode-1-1-utf-7", 65000 },
{ "x-unicode-1-1-utf-8", 65001 },
{ "x-unicode-2-0-utf-7", 65000 },
{ "x-unicode-2-0-utf-8", 65001 },
};
// redeclaring these constants here for readability below
private const uint MIMECONTF_MAILNEWS = Encoding.MIMECONTF_MAILNEWS;
private const uint MIMECONTF_BROWSER = Encoding.MIMECONTF_BROWSER;
private const uint MIMECONTF_SAVABLE_MAILNEWS = Encoding.MIMECONTF_SAVABLE_MAILNEWS;
private const uint MIMECONTF_SAVABLE_BROWSER = Encoding.MIMECONTF_SAVABLE_BROWSER;
// keep this array sorted by code page, so the order is consistent for GetEncodings()
// Remember to update GetCodePageDataItem() if this list is updated
private readonly static CodePageDataItem[] s_encodingDataTableItems = new[]
{
new CodePageDataItem(1200, 1200, "utf-16", MIMECONTF_SAVABLE_BROWSER), // "Unicode"
new CodePageDataItem(1201, 1200, "utf-16BE", 0), // Big Endian, old FFFE BOM seems backwards, think of the BOM in little endian order.
new CodePageDataItem(12000, 1200, "utf-32", 0), // "Unicode (UTF-32)"
new CodePageDataItem(12001, 1200, "utf-32BE", 0), // "Unicode (UTF-32 Big Endian)"
new CodePageDataItem(20127, 1252, "us-ascii", MIMECONTF_MAILNEWS | MIMECONTF_SAVABLE_MAILNEWS), // "US-ASCII"
new CodePageDataItem(28591, 1252, "iso-8859-1", MIMECONTF_MAILNEWS | MIMECONTF_BROWSER | MIMECONTF_SAVABLE_MAILNEWS | MIMECONTF_SAVABLE_BROWSER), // "Western European (ISO)"
new CodePageDataItem(65000, 1200, "utf-7", MIMECONTF_MAILNEWS | MIMECONTF_SAVABLE_MAILNEWS), // "Unicode (UTF-7)"
new CodePageDataItem(65001, 1200, "utf-8", MIMECONTF_MAILNEWS | MIMECONTF_BROWSER | MIMECONTF_SAVABLE_MAILNEWS | MIMECONTF_SAVABLE_BROWSER), // "Unicode (UTF-8)"
};
}
}
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