|
static private ReadDirEntry ( |
||
| zf | /// The zipfile for which a directory entry will be read. From this param, the /// method gets the ReadStream and the expected text encoding /// (ProvisionalAlternateEncoding) which is used if the entry is not marked /// UTF-8. /// | |
| previouslySeen | Object>.Dictionary | /// a list of previously seen entry names; used to prevent duplicates. /// |
| return | ||
// build the TOC by reading each entry in the file.
private static void ReadIntoInstance_Orig(ZipFile zf)
{
zf.OnReadStarted();
//zf._entries = new System.Collections.Generic.List<ZipEntry>();
zf._entries = new System.Collections.Generic.Dictionary <String, ZipEntry>();
ZipEntry e;
if (zf.Verbose)
{
if (zf.Name == null)
{
zf.StatusMessageTextWriter.WriteLine("Reading zip from stream...");
}
else
{
zf.StatusMessageTextWriter.WriteLine("Reading zip {0}...", zf.Name);
}
}
// work item 6647: PK00 (packed to removable disk)
bool firstEntry = true;
ZipContainer zc = new ZipContainer(zf);
while ((e = ZipEntry.ReadEntry(zc, firstEntry)) != null)
{
if (zf.Verbose)
{
zf.StatusMessageTextWriter.WriteLine(" {0}", e.FileName);
}
zf._entries.Add(e.FileName, e);
firstEntry = false;
}
// read the zipfile's central directory structure here.
// workitem 9912
// But, because it may be corrupted, ignore errors.
try
{
ZipEntry de;
// in lieu of hashset, use a dictionary
var previouslySeen = new Dictionary <String, Object>();
while ((de = ZipEntry.ReadDirEntry(zf, previouslySeen)) != null)
{
// Housekeeping: Since ZipFile exposes ZipEntry elements in the enumerator,
// we need to copy the comment that we grab from the ZipDirEntry
// into the ZipEntry, so the application can access the comment.
// Also since ZipEntry is used to Write zip files, we need to copy the
// file attributes to the ZipEntry as appropriate.
ZipEntry e1 = zf._entries[de.FileName];
if (e1 != null)
{
e1._Comment = de.Comment;
if (de.IsDirectory)
{
e1.MarkAsDirectory();
}
}
previouslySeen.Add(de.FileName, null); // to prevent dupes
}
// workitem 8299
if (zf._locEndOfCDS > 0)
{
zf.ReadStream.Seek(zf._locEndOfCDS, SeekOrigin.Begin);
}
ReadCentralDirectoryFooter(zf);
if (zf.Verbose && !String.IsNullOrEmpty(zf.Comment))
{
zf.StatusMessageTextWriter.WriteLine("Zip file Comment: {0}", zf.Comment);
}
}
catch (ZipException) { }
catch (IOException) { }
zf.OnReadCompleted();
}
private static void ReadCentralDirectory(ZipFile zf)
{
// We must have the central directory footer record, in order to properly
// read zip dir entries from the central directory. This because the logic
// knows when to open a spanned file when the volume number for the central
// directory differs from the volume number for the zip entry. The
// _diskNumberWithCd was set when originally finding the offset for the
// start of the Central Directory.
// workitem 9214
bool inputUsesZip64 = false;
ZipEntry de;
// in lieu of hashset, use a dictionary
var previouslySeen = new Dictionary <String, object>();
while ((de = ZipEntry.ReadDirEntry(zf, previouslySeen)) != null)
{
de.ResetDirEntry();
zf.OnReadEntry(true, null);
if (zf.Verbose)
{
zf.StatusMessageTextWriter.WriteLine("entry {0}", de.FileName);
}
zf._entries.Add(de.FileName, de);
// workitem 9214
if (de._InputUsesZip64)
{
inputUsesZip64 = true;
}
previouslySeen.Add(de.FileName, null); // to prevent dupes
}
// workitem 9214; auto-set the zip64 flag
if (inputUsesZip64)
{
zf.UseZip64WhenSaving = Zip64Option.Always;
}
// workitem 8299
if (zf._locEndOfCDS > 0)
{
zf.ReadStream.Seek(zf._locEndOfCDS, SeekOrigin.Begin);
}
ReadCentralDirectoryFooter(zf);
if (zf.Verbose && !String.IsNullOrEmpty(zf.Comment))
{
zf.StatusMessageTextWriter.WriteLine("Zip file Comment: {0}", zf.Comment);
}
// We keep the read stream open after reading.
if (zf.Verbose)
{
zf.StatusMessageTextWriter.WriteLine("read in {0} entries.", zf._entries.Count);
}
zf.OnReadCompleted();
}
