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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.
using System.IO;
using System.Diagnostics;
using System.Globalization;
using System.Collections.Generic;
namespace System.Reflection
{
//
// Parses an assembly name.
//
internal static class AssemblyNameParser
{
internal static RuntimeAssemblyName Parse(string s)
{
Debug.Assert(s != null);
int indexOfNul = s.IndexOf((char)0);
if (indexOfNul != -1)
s = s.Substring(0, indexOfNul);
if (s.Length == 0)
throw new ArgumentException();
AssemblyNameLexer lexer = new AssemblyNameLexer(s);
// Name must come first.
string name;
AssemblyNameLexer.Token token = lexer.GetNext(out name);
if (token != AssemblyNameLexer.Token.String)
throw new FileLoadException();
if (name == string.Empty || name.IndexOfAny(s_illegalCharactersInSimpleName) != -1)
throw new FileLoadException();
Version version = null;
string cultureName = null;
byte[] pkt = null;
AssemblyNameFlags flags = 0;
List<string> alreadySeen = new List<string>();
token = lexer.GetNext();
while (token != AssemblyNameLexer.Token.End)
{
if (token != AssemblyNameLexer.Token.Comma)
throw new FileLoadException();
string attributeName;
token = lexer.GetNext(out attributeName);
if (token != AssemblyNameLexer.Token.String)
throw new FileLoadException();
token = lexer.GetNext();
// Compat note: Inside AppX apps, the desktop CLR's AssemblyName parser skips past any elements that don't follow the "<Something>=<Something>" pattern.
// (when running classic Windows apps, such an illegal construction throws an exception as expected.)
// Naturally, at least one app unwittingly takes advantage of this.
if (token == AssemblyNameLexer.Token.Comma || token == AssemblyNameLexer.Token.End)
continue;
if (token != AssemblyNameLexer.Token.Equals)
throw new FileLoadException();
string attributeValue;
token = lexer.GetNext(out attributeValue);
if (token != AssemblyNameLexer.Token.String)
throw new FileLoadException();
if (attributeName == string.Empty)
throw new FileLoadException();
for (int i = 0; i < alreadySeen.Count; i++)
{
if (alreadySeen[i].Equals(attributeName, StringComparison.OrdinalIgnoreCase))
throw new FileLoadException(); // Cannot specify the same attribute twice.
}
alreadySeen.Add(attributeName);
if (attributeName.Equals("Version", StringComparison.OrdinalIgnoreCase))
{
version = ParseVersion(attributeValue);
}
if (attributeName.Equals("Culture", StringComparison.OrdinalIgnoreCase))
{
cultureName = ParseCulture(attributeValue);
}
if (attributeName.Equals("PublicKeyToken", StringComparison.OrdinalIgnoreCase))
{
pkt = ParsePKT(attributeValue);
}
if (attributeName.Equals("ProcessorArchitecture", StringComparison.OrdinalIgnoreCase))
{
flags |= (AssemblyNameFlags)(((int)ParseProcessorArchitecture(attributeValue)) << 4);
}
if (attributeName.Equals("Retargetable", StringComparison.OrdinalIgnoreCase))
{
if (attributeValue.Equals("Yes", StringComparison.OrdinalIgnoreCase))
flags |= AssemblyNameFlags.Retargetable;
else if (attributeValue.Equals("No", StringComparison.OrdinalIgnoreCase))
{
// nothing to do
}
else
throw new FileLoadException();
}
if (attributeName.Equals("ContentType", StringComparison.OrdinalIgnoreCase))
{
if (attributeValue.Equals("WindowsRuntime", StringComparison.OrdinalIgnoreCase))
flags |= (AssemblyNameFlags)(((int)AssemblyContentType.WindowsRuntime) << 9);
else
throw new FileLoadException();
}
// Desktop compat: If we got here, the attribute name is unknown to us. Ignore it (as long it's not duplicated.)
token = lexer.GetNext();
}
return new RuntimeAssemblyName(name, version, cultureName, flags, pkt);
}
private static Version ParseVersion(string attributeValue)
{
string[] parts = attributeValue.Split('.');
if (parts.Length > 4)
throw new FileLoadException();
ushort[] versionNumbers = new ushort[4];
for (int i = 0; i < versionNumbers.Length; i++)
{
if (i >= parts.Length)
versionNumbers[i] = ushort.MaxValue;
else
{
// Desktop compat: TryParse is a little more forgiving than Fusion.
for (int j = 0; j < parts[i].Length; j++)
{
if (!char.IsDigit(parts[i][j]))
throw new FileLoadException();
}
if (!(ushort.TryParse(parts[i], out versionNumbers[i])))
{
throw new FileLoadException();
}
}
}
if (versionNumbers[0] == ushort.MaxValue || versionNumbers[1] == ushort.MaxValue)
throw new FileLoadException();
if (versionNumbers[2] == ushort.MaxValue)
return new Version(versionNumbers[0], versionNumbers[1]);
if (versionNumbers[3] == ushort.MaxValue)
return new Version(versionNumbers[0], versionNumbers[1], versionNumbers[2]);
return new Version(versionNumbers[0], versionNumbers[1], versionNumbers[2], versionNumbers[3]);
}
private static string ParseCulture(string attributeValue)
{
if (attributeValue.Equals("Neutral", StringComparison.OrdinalIgnoreCase))
{
return "";
}
else
{
CultureInfo culture = CultureInfo.GetCultureInfo(attributeValue); // Force a CultureNotFoundException if not a valid culture.
return culture.Name;
}
}
private static byte[] ParsePKT(string attributeValue)
{
if (attributeValue.Equals("null", StringComparison.OrdinalIgnoreCase) || attributeValue == string.Empty)
return Array.Empty<byte>();
if (attributeValue.Length != 8 * 2)
throw new FileLoadException();
byte[] pkt = new byte[8];
int srcIndex = 0;
for (int i = 0; i < 8; i++)
{
char hi = attributeValue[srcIndex++];
char lo = attributeValue[srcIndex++];
pkt[i] = (byte)((ParseHexNybble(hi) << 4) | ParseHexNybble(lo));
}
return pkt;
}
private static ProcessorArchitecture ParseProcessorArchitecture(string attributeValue)
{
if (attributeValue.Equals("msil", StringComparison.OrdinalIgnoreCase))
return ProcessorArchitecture.MSIL;
if (attributeValue.Equals("x86", StringComparison.OrdinalIgnoreCase))
return ProcessorArchitecture.X86;
if (attributeValue.Equals("ia64", StringComparison.OrdinalIgnoreCase))
return ProcessorArchitecture.IA64;
if (attributeValue.Equals("amd64", StringComparison.OrdinalIgnoreCase))
return ProcessorArchitecture.Amd64;
if (attributeValue.Equals("arm", StringComparison.OrdinalIgnoreCase))
return ProcessorArchitecture.Arm;
throw new FileLoadException();
}
private static byte ParseHexNybble(char c)
{
if (c >= '0' && c <= '9')
return (byte)(c - '0');
if (c >= 'a' && c <= 'f')
return (byte)(c - 'a' + 10);
if (c >= 'A' && c <= 'F')
return (byte)(c - 'A' + 10);
throw new FileLoadException();
}
private static readonly char[] s_illegalCharactersInSimpleName = { '/', '\\', ':' };
}
}
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