/// <summary>
/// Load all manifest entries from a given manifest in a JAR
/// </summary>
/// <param name="source">source JAR</param>
/// <param name="manifest">manifest to load</param>
/// <returns>manifest data</returns>
public ManifestData Load(IJar source, string path)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (path.IsNullOrEmpty())
{
throw new ArgumentNullException(nameof(path));
}
// If this file does not exist, obviously we cannot load it
if (!source.Contains(path))
{
throw new ManifestException($"Manifest {path} does not exist");
}
ManifestData manifest = new ManifestData
{
ManifestDigest = String.Empty,
Entries = new List <ManifestEntry>()
};
// The manifest digest is supposed to refer to the digest that THIS manifest
// expects the main manifest to have. Until set otherwise, assume this digest
// is = to our own hash (which means loading the main manifest populates this
// value with the main manifest hash for future comparison)
using (Hasher h = new Hasher())
{
manifest.ManifestDigest = source.SHA256(h, path).ToBase64();
}
try
{
using (StreamReader reader = new StreamReader(source.Open(path)))
{
string[] lines = Unwrap70(reader.ReadToEnd().Split(
new char[]
{
(char)10,
(char)13
},
StringSplitOptions.RemoveEmptyEntries));
Populate(manifest, lines);
}
}
catch (Exception ex)
{
throw new ManifestException($"Failed to open or parse manifest {path}", ex);
}
return(manifest);
}
/// <summary>
/// Populate the entries in a manfiest from the given text lines
/// </summary>
/// <param name="manifest">manifest to populate</param>
/// <param name="lines">individual manifest lines</param>
private void Populate(ManifestData manifest, string[] lines)
{
for (int ptr = 0; ptr < lines.Length; ptr++)
{
string line = lines[ptr];
// Split each line into NAME: VALUE
string[] parts = lines[ptr].Split(new char[] { ':' }, StringSplitOptions.RemoveEmptyEntries);
if (parts.Length == 2)
{
// Is it a filename?
if (parts[0].Equals("Name", StringComparison.InvariantCultureIgnoreCase))
{
// There must be a digest so split the next line in half too
string[] digestParts = lines[ptr + 1].Split(new char[] { ':' }, StringSplitOptions.RemoveEmptyEntries);
manifest.Entries.Add(new ManifestEntry
{
Path = parts[1].TrimStart(),
Digest = digestParts[1].TrimStart(),
// Preserve spacing structure for SF hashing comparison
//
// The newlines are important and this is the only document that really tells you:
// https://docs.oracle.com/javase/7/docs/technotes/tools/windows/jarsigner.html
// "hash of the **three** lines in the manifest file for the source file."
//
Original =
Wrap70(lines[ptr]) + Environment.NewLine +
Wrap70(lines[ptr + 1]) + Environment.NewLine + Environment.NewLine
});
// Skip the line after us because have already read it
ptr++;
continue;
}
// Is it the manifest hash?
if (parts[0].EndsWith("Digest-Manifest", StringComparison.InvariantCultureIgnoreCase))
{
// Second half MUST be the hash (and MANIFEST.MF cannot wrap)
manifest.ManifestDigest = parts[1].TrimStart();
}
}
}
}
