internal static BimilItem Parse(BimilDocument document, byte[] buffer, int offset, int count)
{
if (count < 4)
{
throw new FormatException("Invalid buffer size.");
}
var res = new BimilItem(document);
var currOffset = offset;
while (currOffset < (offset + count))
{
var keyLength = GetInt32(buffer, currOffset);
var valueLength = GetInt32(buffer, currOffset + 4);
var type = (BimilRecordFormat)GetInt32(buffer, currOffset + 8);
var key = BimilValue.Parse(document, buffer, currOffset + 12, keyLength);
var value = BimilValue.Parse(document, buffer, currOffset + 12 + keyLength, valueLength);
res.Records.Add(new BimilRecord(document, key.Text, value.Text, type));
currOffset += 12 + keyLength + valueLength;
}
if (currOffset != (offset + count))
{
throw new FormatException("Invalid buffer content.");
}
return(res);
}
/// <summary>
/// Returns document.
/// </summary>
/// <param name="stream">Stream.</param>
/// <param name="password">Password.</param>
/// <exception cref="FormatException">Cannot parse document.</exception>
public static BimilDocument Open(Stream stream, string password)
{
try {
using (var timer = new Medo.Diagnostics.LifetimeWatch("Open")) {
var doc = new BimilDocument();
var salt = new byte[16];
stream.Read(salt, 0, 16);
doc.PasswordSalt = salt;
var deriveBytes = new Rfc2898DeriveBytes(UTF8Encoding.UTF8.GetBytes(password), doc.PasswordSalt, 4096);
doc.Crypto.Key = deriveBytes.GetBytes(16);
doc.Crypto.IV = deriveBytes.GetBytes(16);
var encBuffer = new byte[stream.Length - 16];
stream.Read(encBuffer, 0, encBuffer.Length);
byte[] decBuffer;
using (var dec = doc.Crypto.CreateDecryptor()) {
decBuffer = dec.TransformFinalBlock(encBuffer, 0, encBuffer.Length);
}
if ((decBuffer[0] == 0x41) && (decBuffer[1] == 0x31) && (decBuffer[2] == 0x32) && (decBuffer[3] == 0x38))
{
if ((decBuffer[decBuffer.Length - 4] != 0x41) || (decBuffer[decBuffer.Length - 3] != 0x31) || (decBuffer[decBuffer.Length - 2] != 0x32) || (decBuffer[decBuffer.Length - 1] != 0x38))
{
throw new FormatException("Invalid secondary identifier.");
}
doc.Id = "A128";
}
else
{
throw new FormatException("Invalid primary identifier.");
}
var currOffset = 4;
while (currOffset < (decBuffer.Length - 4))
{
var itemLen = GetInt32(decBuffer, currOffset);
var item = BimilItem.Parse(doc, decBuffer, currOffset + 4, itemLen);
doc.Items.Add(item);
currOffset += 4 + itemLen;
}
return(doc);
}
} catch (CryptographicException ex) {
throw new FormatException("Cannot parse document.", ex);
} catch (OverflowException ex) {
throw new FormatException("Cannot parse document.", ex);
} catch (SecurityException ex) {
throw new FormatException("Cannot parse document.", ex);
}
}
internal static BimilValue Parse(BimilDocument document, byte[] buffer, int offset, int count)
{
var encBuffer = new byte[count];
Buffer.BlockCopy(buffer, offset, encBuffer, 0, count);
return(new BimilValue(document)
{
Bytes = encBuffer
});
}
/// <summary>
/// Saves current document to stream using another password. Current document is not affected.
/// </summary>
/// <param name="stream">Stream.</param>
/// <param name="newPassword">Password.</param>
public void Save(Stream stream, string newPassword)
{
using (var newDoc = new BimilDocument(newPassword)) {
foreach (var item in this.Items)
{
var newItem = newDoc.AddItem(item.Name, item.IconIndex);
foreach (var record in item.Records)
{
newItem.AddRecord(record.Key.Text, record.Value.Text, record.Format);
}
}
newDoc.Save(stream);
}
}
internal BimilValue(BimilDocument document)
{
this.Document = document;
this.Text = "";
}
internal BimilItem(BimilDocument document)
{
this.Document = document;
this.Records = new List <BimilRecord>();
}
