/// <summary>Advances the enumerator to the next element of the collection.</summary>
/// <summary>Sets <see cref="Current"/> to the next zip entry.</summary>
/// <returns><c>true</c> if the next entry is not <c>null</c>; otherwise <c>false</c>.</returns>
public bool MoveNext()
{
// close any open entry
CloseEntry();
int result;
if (_current == null)
{
result = ZipLib.unzGoToFirstFile(_handle);
}
else
{
result = ZipLib.unzGoToNextFile(_handle);
}
if (result < 0)
{
// last entry found - not an exceptional case
_current = null;
}
else
{
// entry found
OpenEntry();
}
return(_current != null);
}
/// <summary>Creates a new zip entry in the directory and positions the stream to the start of the entry data.</summary>
/// <param name="entry">The zip entry to be written.</param>
/// <remarks>Closes the current entry if still active.</remarks>
public void AddEntry(ZipEntry entry)
{
ZipFileEntryInfo info;
info.DateTime = entry.ModifiedTime;
int result;
unsafe {
byte[] extra = null;
uint extraLength = 0;
if (entry.ExtraField != null)
{
extra = entry.ExtraField;
extraLength = (uint)entry.ExtraField.Length;
}
result = ZipLib.zipOpenNewFileInZip(
_handle,
entry.Name,
&info,
extra,
extraLength,
null, 0,
entry.Comment,
(int)entry.Method,
entry.Level);
}
_entryOpen = true;
}
private void CloseEntry()
{
if (_entryOpen)
{
int result = ZipLib.zipCloseFileInZip(_handle);
_entryOpen = false;
}
}
/// <summary>Initializes a instance of the <see cref="ZipReader"/> class for reading the zip file with the given name.</summary>
/// <param name="fileName">The name of zip file that will be read.</param>
public ZipReader(string fileName)
{
_fileName = fileName;
_handle = ZipLib.unzOpen(fileName);
if (_handle == IntPtr.Zero)
{
string msg = String.Format("Could not open zip file '{0}'.", fileName);
throw new ZipException(msg);
}
}
/// <summary>Initializes a new instance fo the <see cref="ZipWriter"/> class with a specified file name. Any Existing file will be overwritten.</summary>
/// <param name="fileName">The name of the zip file to create.</param>
public ZipWriter(string fileName)
{
_fileName = fileName;
_handle = ZipLib.zipOpen(fileName, 0);
if (_handle == IntPtr.Zero)
{
string msg = String.Format("Could not open zip file '{0}' for writing.", fileName);
throw new ZipException(msg);
}
}
private void OpenEntry()
{
_current = new ZipEntry(_handle);
int result = ZipLib.unzOpenCurrentFile(_handle);
if (result < 0)
{
_current = null;
throw new ZipException("Could not open entry for reading.");
}
_entryOpen = true;
}
/// <summary>Seek to the specified entry.</summary>
/// <param name="entryName">The name of the entry to seek to.</param>
public void Seek(string entryName)
{
CloseEntry();
int result = ZipLib.unzLocateFile(_handle, entryName, 0);
if (result < 0)
{
string msg = String.Format("Could not locate entry named '{0}'.", entryName);
throw new ZipException(msg);
}
OpenEntry();
}
private void CloseFile()
{
if (_handle != IntPtr.Zero)
{
CloseEntry();
int result = ZipLib.unzClose(_handle);
if (result < 0)
{
throw new ZipException("Could not close zip file.");
}
_handle = IntPtr.Zero;
}
}
/// <summary>Uncompress a block of bytes from the current zip entry and writes the data in a given buffer.</summary>
/// <param name="buffer">The array to write data into.</param>
/// <param name="index">The byte offset in <paramref name="buffer"/> at which to begin writing.</param>
/// <param name="count">The maximum number of bytes to read.</param>
public int Read(byte[] buffer, int index, int count)
{
if (index != 0)
{
throw new ArgumentException("index", "Only index values of zero currently supported.");
}
int bytesRead = ZipLib.unzReadCurrentFile(_handle, buffer, (uint)count);
if (bytesRead < 0)
{
throw new ZipException("Error reading zip entry.");
}
return(bytesRead);
}
/// <summary>Creates a new Zip file entry reading values from a zip file.</summary>
internal ZipEntry(IntPtr handle)
{
ZipEntryInfo entryInfo;
int result = 0;
unsafe {
result = ZipLib.unzGetCurrentFileInfo(handle, &entryInfo, null, 0, null, 0, null, 0);
}
if (result != 0)
{
throw new ZipException("Could not read entries from zip file " + Name);
}
ExtraField = new byte[entryInfo.ExtraFieldLength];
sbyte[] entryNameBuffer = new sbyte[entryInfo.FileNameLength];
sbyte[] commentBuffer = new sbyte[entryInfo.CommentLength];
unsafe {
result = ZipLib.unzGetCurrentFileInfo(handle, &entryInfo,
entryNameBuffer, (uint)entryNameBuffer.Length,
ExtraField, (uint)ExtraField.Length,
commentBuffer, (uint)commentBuffer.Length);
}
if (result != 0)
{
throw new ZipException("Could not read entries from zip file " + Name);
}
_name = ZipLib.AnsiToString(entryNameBuffer);
_comment = ZipLib.AnsiToString(commentBuffer);
_crc = entryInfo.Crc;
_compressedLength = entryInfo.CompressedSize;
_uncompressedLength = entryInfo.UncompressedSize;
_method = (CompressionMethod)entryInfo.CompressionMethod;
_modifiedTime = new DateTime(
(int)entryInfo.DateTime.Year,
(int)entryInfo.DateTime.Month + 1,
(int)entryInfo.DateTime.Day,
(int)entryInfo.DateTime.Hours,
(int)entryInfo.DateTime.Minutes,
(int)entryInfo.DateTime.Seconds);
}
private void CloseEntry()
{
if (_entryOpen)
{
int result = ZipLib.unzCloseCurrentFile(_handle);
if (result < 0)
{
switch ((ErrorCode)result)
{
case ErrorCode.CrcError:
throw new ZipException("All the file was read but the CRC did not match.");
default:
throw new ZipException("Could not close zip entry.");
}
}
_entryOpen = false;
}
}
/// <summary>Compress a block of bytes from the given buffer and writes them into the current zip entry.</summary>
/// <param name="buffer">The array to read data from.</param>
/// <param name="index">The byte offset in <paramref name="buffer"/> at which to begin reading.</param>
/// <param name="count">The maximum number of bytes to write.</param>
public void Write(byte[] buffer, int index, int count)
{
int result = ZipLib.zipWriteInFileInZip(_handle, buffer, (uint)count);
}
