/// <summary>
/// Builds a CDB file from a CDB-format <see cref="Stream"/>, excluding
/// records with data matching keys in `ignoreCdb'.
/// </summary>
/// <param name="stream">The <see cref="Stream"/> to read from.</param>
/// <param name="cdbFilepath">The CDB file to create.</param>
/// <param name="tempFilepath">The temporary file to use when creating the
/// CDB file.</param>
/// <param name="ignoreCdb">If the data for an entry matches a key in this
/// CDB file, the entry will not be added to the new file.</param>
/// <exception cref="System.IO.IOException">if an error occurs rebuilding the
/// CDB file.</exception>
public static void Make(Stream stream, string cdbFilepath, string tempFilepath, CdbReader ignoreCdb)
{
/* Create the CdbMake object. */
using (CdbWriter cdbMake = new CdbWriter(tempFilepath))
{
/* Process the data file. */
int ch;
while (true)
{
/* Read and process a byte. */
ch = stream.ReadByte();
if (ch == -1)
{
break;
}
if (ch == '\n')
{
break;
}
if (ch != '+')
{
throw new ArgumentException("input file not in correct format");
}
/* Get the key length. */
int klen = 0;
for (;;)
{
ch = stream.ReadByte();
if (ch == ',')
{
break;
}
if ((ch < '0') || (ch > '9'))
{
throw new ArgumentException("input file not in correct format");
}
if (klen > 429496720)
{
throw new ArgumentException("key length is too big");
}
klen = klen * 10 + (ch - '0');
}
/* Get the data length. */
int dlen = 0;
for (;;)
{
ch = stream.ReadByte();
if (ch == ':')
{
break;
}
if ((ch < '0') || (ch > '9'))
{
throw new ArgumentException("input file not in correct format");
}
if (dlen > 429496720)
{
throw new ArgumentException("data length is too big");
}
dlen = dlen * 10 + (ch - '0');
}
/* Read in the key. */
byte[] key = new byte[klen];
for (int i = 0; i < klen; i++)
{
/* Read the character. */
ch = stream.ReadByte();
if (ch == -1)
{
throw new ArgumentException("input file is truncated");
}
/* Store the character. */
key[i] = unchecked ((byte)(ch & 0xff));
}
/* Read key/data separator characters. */
ch = stream.ReadByte();
if (ch != '-')
{
throw new ArgumentException("input file not in correct format");
}
ch = stream.ReadByte();
if (ch != '>')
{
throw new ArgumentException("input file not in correct format");
}
/* Read in the data. */
byte[] data = new byte[dlen];
for (int i = 0; i < dlen; i++)
{
/* Read the character. */
ch = stream.ReadByte();
if (ch == -1)
{
throw new ArgumentException("input file is truncated");
}
/* Store the character. */
data[i] = unchecked ((byte)(ch & 0xff));
}
/* Add the key/data pair to the database if it is not in
* ignoreCdb. */
if ((ignoreCdb == null) || (ignoreCdb.Find(data) == null))
{
cdbMake.Add(key, data);
}
/* Read the terminating LF. */
ch = stream.ReadByte();
if (ch != '\n')
{
throw new ArgumentException("input file not in correct format");
}
}
}
/* Rename the data file. */
File.Move(tempFilepath, cdbFilepath);
}
/// <summary>
/// Builds a CDB file from a CDB-format text file, excluding records
/// with data matching keys in `ignoreCdb'.
/// </summary>
/// <param name="dataFilePath">The CDB data file to read.</param>
/// <param name="cdbFilePath">The CDB file to create.</param>
/// <param name="tempFilePath">The temporary file to use when creating the
/// CDB file.</param>
/// <param name="ignoreCdb">If the data for an entry matches a key in this
/// CDB file, the entry will not be added to the new file.</param>
/// <exception cref="System.IO.IOException">if an error occurs rebuilding the
/// CDB file.</exception>
public static void Make(string dataFilePath, string cdbFilePath, string tempFilePath, CdbReader ignoreCdb)
{
/* Open the data file. */
using (FileStream fileStream = new FileStream(dataFilePath, FileMode.CreateNew, FileAccess.ReadWrite))
{
/* Build the database. */
Make(fileStream, cdbFilePath, tempFilePath, ignoreCdb);
}
}