// --- load ---
/// <summary>Loads a database from a byte array.</summary>
/// <param name="bytes">The byte array.</param>
/// <returns>The database.</returns>
internal static Database Load(byte[] bytes)
{
/*
* Parse the enclosing file format that holds the
* compressed (gzip) data and then decompress the data.
* */
int version;
byte[] compressed;
byte[] md5;
using (MemoryStream stream = new MemoryStream(bytes)) {
using (BinaryReader reader = new BinaryReader(stream, Encoding.UTF8)) {
// 0x5453494C5F46535 = "TSF_LIST"
if (reader.ReadUInt64() != 0x5453494C5F465354)
{
throw new InvalidDataException("The identifier in the header is invalid.");
}
version = reader.ReadInt32();
if (version != 2)
{
throw new InvalidDataException("The version number in the header is invalid.");
}
md5 = reader.ReadBytes(16);
int length = reader.ReadInt32();
compressed = reader.ReadBytes(length);
// 0x444E455F = "_END"
if (reader.ReadUInt32() != 0x444E455F)
{
throw new InvalidDataException("The identifier in the footer is invalid.");
}
}
}
byte[] check = (new MD5CryptoServiceProvider()).ComputeHash(compressed);
for (int i = 0; i < 16; i++)
{
if (md5[i] != check[i])
{
throw new InvalidDataException("The MD5 does not match.");
}
}
byte[] decompressed = Gzip.Decompress(compressed);
/*
* Parse the raw file format and extract the database.
* */
Database database = new Database();
using (MemoryStream stream = new MemoryStream(decompressed)) {
using (BinaryReader reader = new BinaryReader(stream)) {
// 0x74727473 = "strt"
if (reader.ReadUInt32() != 0x74727473)
{
throw new InvalidDataException("The uncompressed stream is invalid.");
}
database.Packages = new Package[reader.ReadInt32()];
for (int i = 0; i < database.Packages.Length; i++)
{
database.Packages[i] = new Package();
database.Packages[i].Name = reader.ReadString();
database.Packages[i].Versions = new Version[reader.ReadInt32()];
for (int j = 0; j < database.Packages[i].Versions.Length; j++)
{
database.Packages[i].Versions[j] = new Version();
database.Packages[i].Versions[j].Name = database.Packages[i].Name;
database.Packages[i].Versions[j].Number = reader.ReadString();
database.Packages[i].Versions[j].Sources = new Source[reader.ReadInt32()];
for (int k = 0; k < database.Packages[i].Versions[j].Sources.Length; k++)
{
database.Packages[i].Versions[j].Sources[k].Size = reader.ReadInt32();
database.Packages[i].Versions[j].Sources[k].MD5 = reader.ReadBytes(16);
database.Packages[i].Versions[j].Sources[k].Url = reader.ReadString();
}
database.Packages[i].Versions[j].Dependencies = new Dependency[reader.ReadInt32()];
for (int k = 0; k < database.Packages[i].Versions[j].Dependencies.Length; k++)
{
database.Packages[i].Versions[j].Dependencies[k] = new Dependency();
database.Packages[i].Versions[j].Dependencies[k].Name = reader.ReadString();
database.Packages[i].Versions[j].Dependencies[k].Version = reader.ReadString();
}
database.Packages[i].Versions[j].Suggestions = new Dependency[reader.ReadInt32()];
for (int k = 0; k < database.Packages[i].Versions[j].Suggestions.Length; k++)
{
database.Packages[i].Versions[j].Suggestions[k] = new Dependency();
database.Packages[i].Versions[j].Suggestions[k].Name = reader.ReadString();
database.Packages[i].Versions[j].Suggestions[k].Version = reader.ReadString();
}
database.Packages[i].Versions[j].Metadata = new KeyValuePair[reader.ReadInt32()];
for (int k = 0; k < database.Packages[i].Versions[j].Metadata.Length; k++)
{
string key = reader.ReadString();
string value = reader.ReadString();
database.Packages[i].Versions[j].Metadata[k] = new KeyValuePair(key, value);
}
}
}
if (reader.ReadUInt32() != 0x646E655F)
{
throw new InvalidDataException("The uncompressed stream is invalid.");
}
}
}
return(database);
}
/// <summary>Installs the specified package, but not its dependencies.</summary>
/// <param name="version">The specific version of the package.</param>
/// <param name="size">Accumulates the size of the downloaded data in an interlocked operation. If the operation fails, all accumulated size is subtracted again.</param>
/// <returns>Whether the package was successfully installed.</returns>
internal bool InstallPackage(Version version, ref int size)
{
try {
/*
* Check whether the package is protected.
* */
if (IsInstalledPackageProtected(version.Name))
{
return(false);
}
/*
* Remove existing versions of this package.
*/
string packageDirectory = GetInstalledPackageDirectory(version.Name);
if (packageDirectory != null)
{
RemoveDirectory(packageDirectory);
}
else
{
packageDirectory = Path.Combine(Program.FileSystem.ManagedContentFolders[0], version.Name);
}
/*
* Install the package.
* */
Source[] sources = version.Sources;
Shuffle(sources);
int attemps = sources.Length == 1 ? 3 : sources.Length == 2 ? 2 : 1;
for (int a = 0; a < attemps; a++)
{
for (int i = 0; i < sources.Length; i++)
{
byte[] bytes;
if (Internet.TryDownloadBytesFromUrl(sources[i].Url, out bytes, ref size))
{
if (bytes.Length == sources[i].Size)
{
byte[] md5 = (new MD5CryptoServiceProvider()).ComputeHash(bytes);
bool add = true;
for (int k = 0; k < 16; k++)
{
if (md5[k] != sources[i].Md5[k])
{
add = false;
break;
}
}
if (add)
{
if (bytes.Length >= 2 && bytes[0] == 0x1F && bytes[1] == 0x8B)
{
/* GZIP-compressed */
bytes = Gzip.Decompress(bytes);
}
if ((bytes.Length & 0x1FF) == 0)
{
/* TAR archive */
RemoveDirectory(packageDirectory);
CreateDirectory(packageDirectory);
Tar.Unpack(bytes, packageDirectory, version.Name);
}
else
{
add = false;
}
if (add)
{
/*
* The installation was successful. Save some of
* the package information for offline storage.
* */
StringBuilder builder = new StringBuilder();
builder.AppendLine("name = " + version.Name);
builder.AppendLine("version = " + version.Number);
if (version.Sources.Length != 0)
{
builder.Append("sources = ");
for (int j = 0; j < version.Sources.Length; j++)
{
if (j != 0)
{
builder.Append(',').Append(' ');
}
builder.Append(version.Sources[j].Url);
}
builder.AppendLine();
}
if (version.Dependencies.Length != 0)
{
builder.Append("dependencies = ");
for (int j = 0; j < version.Dependencies.Length; j++)
{
if (j != 0)
{
builder.Append(',').Append(' ');
}
builder.Append(version.Dependencies[j].Name);
builder.Append(' ').Append('(');
builder.Append(version.Dependencies[j].Version);
builder.Append(')');
}
builder.AppendLine();
}
if (version.Suggestions.Length != 0)
{
builder.Append("suggestions = ");
for (int j = 0; j < version.Suggestions.Length; j++)
{
if (j != 0)
{
builder.Append(',').Append(' ');
}
builder.Append(version.Suggestions[j].Name);
builder.Append(' ').Append('(');
builder.Append(version.Suggestions[j].Version);
builder.Append(')');
}
builder.AppendLine();
}
builder.AppendLine();
foreach (KeyValuePair pair in version.Metadata)
{
if (
!string.Equals(pair.Key, "protected", StringComparison.OrdinalIgnoreCase) &&
!string.Equals(pair.Key, "wip", StringComparison.OrdinalIgnoreCase)
)
{
builder.AppendLine(pair.ToString());
}
}
string file = Path.Combine(packageDirectory, "package.cfg");
File.WriteAllText(file, builder.ToString(), new UTF8Encoding(true));
return(true);
}
}
}
Interlocked.Add(ref size, -bytes.Length);
}
}
Thread.Sleep(1000);
}
return(false);
} catch {
return(false);
}
}
