public override int Read(byte[] buffer, int offset, int count)
{
if (currentStream == null) {
if (currentIndex == Int32.MaxValue) {
return 0;
}
if (currentIndex < listaFicheros.Count) {
currentIndex++;
}
if (currentIndex >= listaFicheros.Count) {
return 0;
}
currentFile = listaFicheros[currentIndex];
currentStream = new HashStream (
File.OpenRead (currentFile.File.FullName),
HashAlgorithm.Create ("SHA512"),
currentFile.Hash
);
}
int tmp = 0;
tmp = currentStream.Read (buffer, offset, count);
position += tmp;
if (tmp < count) {
try {
currentStream.Close ();
}
catch (ChecksumVerificationException ex)
{
throw new ChecksumVerificationException (ex.Message, currentFile.File.FullName, ex);
}
catch (IOException e) {
throw new IOException (currentFile.File + " " + e.Message);
}
currentStream = null;
tmp += this.Read(buffer, offset+tmp, count - tmp);
}
return tmp;
}
public override void Close()
{
currentIndex = Int32.MaxValue;
if (currentStream != null) {
try {
currentStream.Close ();
currentStream = null;
}
catch (ChecksumVerificationException ex)
{
throw new ChecksumVerificationException (ex.Message, currentFile.File.FullName, ex);
}
catch (IOException e) {
throw new IOException (currentFile.File + " " + e.Message);
}
}
}
protected override void _Unir(string fichero, string dirDest)
{
OnProgress (0, 1);
string nombre = new FileInfo (fichero).Name.Replace (".001.gsp", "");
string baseName = fichero.Replace (".001.gsp", "");
string fSalida = dirDest + Path.DirectorySeparatorChar + nombre;
Stream salida = UtilidadesFicheros.CreateWriter (fSalida);
HashStream hs = new HashStream (salida, MD5.Create ());
int i = 0;
byte[] buffer = new byte[Consts.BUFFER_LENGTH];
int bytesRead = 0;
long parcial = 0;
long total = 0;
int fragmentosTotales = 0;
bool hasMd5 = false;
string fileMd5 = "";
//string headerVersion;
//string headerFileName;
for (i = 1; File.Exists (String.Format (baseName + ".{0:000}.gsp", i)); i++)
{
String nombreFragmento = String.Format (baseName + ".{0:000}.gsp", i);
Stream fileInStream = File.OpenRead (nombreFragmento);
Stream inStream = fileInStream;
if (i == 1)
{
// Read header
bytesRead = inStream.Read (buffer, 0, 69);
if (bytesRead != 69)
{
throw new IOException ("Premature end of file");
}
hasMd5 = (buffer[0x38] != 0);
fragmentosTotales = UtArrays.LeerInt32BE (buffer, 0x39);
//headerVersion = UtArrays.LeerTexto (buffer, 1, 4);
//headerFileName = UtArrays.LeerTexto (buffer, 6, 50);
total = UtArrays.LeerInt64BE(buffer, 0x3D);
}
if (i == fragmentosTotales && hasMd5)
{
inStream = new SizeLimiterStream (inStream, total - parcial);
}
while ((bytesRead = inStream.Read (buffer, 0, buffer.Length)) > 0)
{
hs.Write (buffer, 0, bytesRead);
parcial += bytesRead;
OnProgress(parcial, total);
}
if (i == fragmentosTotales && hasMd5) {
bytesRead = fileInStream.Read (buffer, 0, 32);
if (bytesRead != 32) {
throw new IOException ("Premature end of file:" + nombreFragmento);
}
fileMd5 = UtArrays.LeerTexto (buffer, 0, 32);
}
fileInStream.Close ();
}
hs.Close ();
if (hasMd5 && !fileMd5.ToLower().Equals (hs.Hash.ToLower()))
{
throw new IOException ("md5 verification failed");
}
OnProgress (parcial, total);
}
private Stream CreateStream()
{
currentFileInfo = new FileInfo (info.GetFragmentFullPath (++currentFragment));
FileStream fis = currentFileInfo.OpenWrite ();
if (md5File != null && hashAlg != null) {
if (md5Stream == null)
{
md5Stream = new StreamWriter(new FileInfo (md5File).OpenWrite ());
}
HashAlgorithm ha = HashAlgorithm.Create (hashAlg);
HashStream st = new HashStream (fis, ha);
return st;
}
return fis;
}
private void ReadHeader()
{
byte[] header = new byte[XAR_HEADER_SIZE];
int leidos = this.inputStream.Read (header, 0, header.Length);
this.Count (leidos);
if (leidos != header.Length) {
throw new IOException ("Invalid header, readed " + leidos + " bytes expected " + header.Length);
}
int magic = UtArrays.LeerInt32BE (header, 0);
int size = UtArrays.LeerInt16BE (header, 4);
version = UtArrays.LeerInt16BE (header, 6);
long toc_length_compressed = UtArrays.LeerInt64BE (header, 8);
long toc_length_uncompressed = UtArrays.LeerInt64BE (header, 16);
int cksum_alg = UtArrays.LeerInt32BE (header, 24);
if (magic != XAR_HEADER_MAGIC)
{
throw new Exception ("Invalid header, not valid magic:" + magic);
}
if (size != header.Length) {
throw new IOException ("Invalid header, size = " + size);
}
this.tocHashAlgorithm = (XarHashAlgorithm)cksum_alg;
Stream s = new SizeLimiterStream (this.inputStream, toc_length_compressed);
HashStream hs1 = null;
switch (this.tocHashAlgorithm) {
case XarHashAlgorithm.Sha1:
hs1 = new HashStream (s, SHA1.Create ());
s = hs1;
break;
case XarHashAlgorithm.Md5:
hs1 = new HashStream (s, MD5.Create ());
s = hs1;
break;
default:
break;
}
Stream st = new InflaterInputStream (
s,
new Inflater (false)
);
this.ReadToc (st);
st.Close ();
this.Count ((int)toc_length_uncompressed);
streamLength = this.Position;
foreach (XarArchiveEntry e in entryList)
{
streamLength += e.Size;
}
if (this.tocHashAlgorithm != XarHashAlgorithm.None && this.tocHashOffset == 0)
{
byte[] h = new byte[this.tocHashSize];
int br = this.inputStream.Read (h, 0, h.Length);
this.heapPosition += br;
string ss = Dalle.Utilidades.UtilidadesCadenas.FormatHexHash (h).ToLower ();
if (!ss.Equals(hs1.Hash)){
throw new IOException("Invalid toc checksum : " + hs1.Hash + " expected " + ss);
}
}
}
public XarArchiveEntry GetNextXarEntry()
{
if (dataStream != null) {
while (this.Read (tmpBuffer) > 0) {
}
dataStream.Close ();
}
dataStream = null;
if (entryCursor >= entryList.Count) {
return null;
}
this.currentEntry = (XarArchiveEntry)entryList[entryCursor++];
if (this.currentEntry.IsDirectory) {
return this.currentEntry;
}
Stream s = new SizeLimiterStream (this.inputStream, this.currentEntry.Length);
if (this.currentEntry.ArchivedChecksum != null) {
switch (this.currentEntry.HashAlgorithmArchived) {
case XarHashAlgorithm.Md5:
s = new HashStream (s, MD5.Create (), this.currentEntry.ArchivedChecksum);
break;
case XarHashAlgorithm.Sha1:
s = new HashStream (s, SHA1.Create (), this.currentEntry.ArchivedChecksum);
break;
default:
break;
}
}
switch (this.currentEntry.Encoding) {
case XarEncoding.None:
dataStream = s;
break;
case XarEncoding.Gzip:
dataStream = new InflaterInputStream (s, new Inflater (false));
break;
case XarEncoding.Bzip2:
dataStream = new BZip2InputStream (s);
break;
default:
break;
}
if (this.currentEntry.ExtractedChecksum != null) {
switch (this.currentEntry.HashAlgorithmExtracted) {
case XarHashAlgorithm.Md5:
dataStream = new HashStream (dataStream, MD5.Create (), this.currentEntry.ExtractedChecksum);
break;
case XarHashAlgorithm.Sha1:
dataStream = new HashStream (dataStream, SHA1.Create (), this.currentEntry.ExtractedChecksum);
break;
default:
break;
}
}
return this.currentEntry;
}
