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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Core.WindowsInstaller.Bind
{
using System;
using System.IO;
using System.Reflection.Metadata;
using System.Reflection.PortableExecutable;
using System.Security.Cryptography;
using System.Text;
using System.Xml;
using System.Xml.XPath;
using WixToolset.Data;
internal static class AssemblyNameReader
{
public static AssemblyName ReadAssembly(SourceLineNumber sourceLineNumbers, string assemblyPath, string fileVersion)
{
try
{
using (var stream = File.OpenRead(assemblyPath))
using (var peReader = new PEReader(stream))
{
var reader = peReader.GetMetadataReader();
var headers = peReader.PEHeaders;
var assembly = reader.GetAssemblyDefinition();
var attributes = assembly.GetCustomAttributes();
var name = ReadString(reader, assembly.Name);
var culture = ReadString(reader, assembly.Culture);
var architecture = headers.PEHeader.Magic == PEMagic.PE32Plus ? "x64" : (headers.CorHeader.Flags & CorFlags.Requires32Bit) == CorFlags.Requires32Bit ? "x86" : null;
var version = assembly.Version.ToString();
var publicKeyToken = ReadPublicKeyToken(reader, assembly.PublicKey);
// There is a bug in v1 fusion that requires the assembly's "version" attribute
// to be equal to or longer than the "fileVersion" in length when its present;
// the workaround is to prepend zeroes to the last version number in the assembly
// version.
var targetNetfx1 = (headers.CorHeader.MajorRuntimeVersion == 2) && (headers.CorHeader.MinorRuntimeVersion == 0);
if (targetNetfx1 && !String.IsNullOrEmpty(fileVersion) && fileVersion.Length > version.Length)
{
var versionParts = version.Split('.');
if (versionParts.Length > 0)
{
var padding = new string('0', fileVersion.Length - version.Length);
versionParts[versionParts.Length - 1] = String.Concat(padding, versionParts[versionParts.Length - 1]);
version = String.Join(".", versionParts);
}
}
return new AssemblyName(name, culture, version, fileVersion, architecture, publicKeyToken, null);
}
}
catch (Exception e) when (e is FileNotFoundException || e is BadImageFormatException || e is InvalidOperationException)
{
throw new WixException(ErrorMessages.InvalidAssemblyFile(sourceLineNumbers, assemblyPath, $"{e.GetType().Name}: {e.Message}"));
}
}
public static AssemblyName ReadAssemblyManifest(SourceLineNumber sourceLineNumbers, string manifestPath)
{
string win32Type = null;
string win32Name = null;
string win32Version = null;
string win32ProcessorArchitecture = null;
string win32PublicKeyToken = null;
// Loading the dom is expensive we want more performant APIs than the DOM
// Navigator is cheaper than dom. Perhaps there is a cheaper API still.
try
{
var doc = new XPathDocument(manifestPath);
var nav = doc.CreateNavigator();
nav.MoveToRoot();
// This assumes a particular schema for a win32 manifest and does not
// provide error checking if the file does not conform to schema.
// The fallback case here is that nothing is added to the MsiAssemblyName
// table for an out of tolerance Win32 manifest. Perhaps warnings needed.
if (nav.MoveToFirstChild())
{
while (nav.NodeType != XPathNodeType.Element || nav.Name != "assembly")
{
nav.MoveToNext();
}
if (nav.MoveToFirstChild())
{
var hasNextSibling = true;
while (nav.NodeType != XPathNodeType.Element || nav.Name != "assemblyIdentity" && hasNextSibling)
{
hasNextSibling = nav.MoveToNext();
}
if (!hasNextSibling)
{
throw new WixException(ErrorMessages.InvalidManifestContent(sourceLineNumbers, manifestPath));
}
if (nav.MoveToAttribute("type", String.Empty))
{
win32Type = nav.Value;
nav.MoveToParent();
}
if (nav.MoveToAttribute("name", String.Empty))
{
win32Name = nav.Value;
nav.MoveToParent();
}
if (nav.MoveToAttribute("version", String.Empty))
{
win32Version = nav.Value;
nav.MoveToParent();
}
if (nav.MoveToAttribute("processorArchitecture", String.Empty))
{
win32ProcessorArchitecture = nav.Value;
nav.MoveToParent();
}
if (nav.MoveToAttribute("publicKeyToken", String.Empty))
{
win32PublicKeyToken = nav.Value;
nav.MoveToParent();
}
}
}
}
catch (FileNotFoundException fe)
{
throw new WixException(ErrorMessages.FileNotFound(sourceLineNumbers, fe.FileName, "AssemblyManifest"));
}
catch (XmlException xe)
{
throw new WixException(ErrorMessages.InvalidXml(sourceLineNumbers, "manifest", xe.Message));
}
return new AssemblyName(win32Name, null, win32Version, null, win32ProcessorArchitecture, win32PublicKeyToken, win32Type);
}
private static string ReadString(MetadataReader reader, StringHandle handle)
{
return handle.IsNil ? null : reader.GetString(handle);
}
private static string ReadPublicKeyToken(MetadataReader reader, BlobHandle handle)
{
if (handle.IsNil)
{
return null;
}
var bytes = reader.GetBlobBytes(handle);
if (bytes.Length == 0)
{
return null;
}
var result = new StringBuilder();
// If we have the full public key, calculate the public key token from the
// last 8 bytes (in reverse order) of the public key's SHA1 hash.
if (bytes.Length > 8)
{
using (var sha1 = SHA1.Create())
{
var hash = sha1.ComputeHash(bytes);
for (var i = 1; i <= 8; ++i)
{
result.Append(hash[hash.Length - i].ToString("X2"));
}
}
}
else
{
foreach (var b in bytes)
{
result.Append(b.ToString("X2"));
}
}
return result.ToString();
}
}
}
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