// 4.3.6 Overall.ZIP file format:
//[local file header 1]
//[encryption header 1]
//[file data 1]
//[data descriptor 1]
// .
// .
// .
//[local file header n]
//[encryption header n]
//[file data n]
//[data descriptor n]
//[archive decryption header]
//[archive extra data record]
//[central directory header 1]
// .
// .
// .
//[central directory header n]
//[zip64 end of central directory record]
//[zip64 end of central directory locator]
//[end of central directory record]
/// <summary>
/// Retrieve the file given by the descriptor (from our list)
/// and return the content as string
/// </summary>
/// <param name="file">A file descriptor from this list</param>
/// <returns>The content of the file or an empty string</returns>
public byte[] GetFile(string p4kFilename, p4kFile file)
{
if (!File.Exists(p4kFilename))
{
return new byte[] { }
}
;
using (p4kRecReader reader = new p4kRecReader(p4kFilename)) {
return(file.GetFile(reader));
}
}
/// <summary>
/// Scans directory entries and return the a file descriptor (string.EndsWith is used)
/// </summary>
/// <param name="p4kFilename">The p4k file</param>
/// <param name="filename">The filename to look for</param>
public p4kFile ScanDirectoryFor(string p4kFilename, string filename)
{
if (!File.Exists(p4kFilename))
{
return(null);
}
using (p4kRecReader reader = new p4kRecReader(p4kFilename)) {
// work from the end of the file
reader.GotoLastPage( );
m_endOfCentralDirRecord = new p4kEndOfCentralDirRecord(reader);
// position first
reader.Seek(m_endOfCentralDirRecord.RecordOffset - p4kRecReader.PageSize);
m_z64EndOfCentralDirLocator = new p4kZ64EndOfCentralDirLocator(reader);
// for the next the position should be found already - seek it
reader.Seek(m_z64EndOfCentralDirLocator.Z64EndOfCentralDir);
m_z64EndOfCentralDirRecord = new p4kZ64EndOfCentralDirRecord(reader);
// now we should have the start of the directory entries...
// position first
reader.Seek(m_z64EndOfCentralDirRecord.Z64StartOfCentralDir);
// loop all file - as per dir reporting
for (long i = 0; i < m_z64EndOfCentralDirRecord.NumberOfEntries; i++)
{
p4kDirectoryEntry de = new p4kDirectoryEntry(reader);
if (!string.IsNullOrEmpty(filename) && de.Filename.ToLower( ).EndsWith(filename.ToLower( )))
{
var p = new p4kFile(de); // FOUND
reader.TheReader.Close( );
return(p); // bail out if found
}
}
}
return(null);
}
/// <summary>
/// Scans directory entries and return the a list of matching file descriptors (string.Contains is used)
/// </summary>
/// <param name="p4kFilename">The p4k file</param>
/// <param name="filenamepart">The filename part to look for</param>
public IList <p4kFile> ScanDirectoryContaining(string p4kFilename, string filenamepart)
{
if (!File.Exists(p4kFilename))
{
return(null);
}
List <p4kFile> fileList = new List <p4kFile>( );
using (p4kRecReader reader = new p4kRecReader(p4kFilename)) {
// work from the end of the file
reader.GotoLastPage( );
m_endOfCentralDirRecord = new p4kEndOfCentralDirRecord(reader);
// position first
reader.Seek(m_endOfCentralDirRecord.RecordOffset - p4kRecReader.PageSize);
m_z64EndOfCentralDirLocator = new p4kZ64EndOfCentralDirLocator(reader);
// for the next the position should be found already - seek it
reader.Seek(m_z64EndOfCentralDirLocator.Z64EndOfCentralDir);
m_z64EndOfCentralDirRecord = new p4kZ64EndOfCentralDirRecord(reader);
// now we should have the start of the directory entries...
// position first
reader.Seek(m_z64EndOfCentralDirRecord.Z64StartOfCentralDir);
// loop all file - as per dir reporting
for (long i = 0; i < m_z64EndOfCentralDirRecord.NumberOfEntries; i++)
{
p4kDirectoryEntry de = new p4kDirectoryEntry(reader);
if (!string.IsNullOrEmpty(filenamepart) && de.Filename.ToLower( ).Contains(filenamepart.ToLower( )))
{
var p = new p4kFile(de); // FOUND
fileList.Add(p);
}
}
}
return(fileList);
}