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using System;
using System.Collections;
using System.Diagnostics;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1
{
public class BerOctetString
: DerOctetString, IEnumerable
{
private static readonly int DefaultChunkSize = 1000;
public static BerOctetString FromSequence(Asn1Sequence seq)
{
int count = seq.Count;
Asn1OctetString[] v = new Asn1OctetString[count];
for (int i = 0; i < count; ++i)
{
v[i] = Asn1OctetString.GetInstance(seq[i]);
}
return new BerOctetString(v);
}
internal static byte[] FlattenOctetStrings(Asn1OctetString[] octetStrings)
{
int count = octetStrings.Length;
switch (count)
{
case 0:
return EmptyOctets;
case 1:
return octetStrings[0].str;
default:
{
int totalOctets = 0;
for (int i = 0; i < count; ++i)
{
totalOctets += octetStrings[i].str.Length;
}
byte[] str = new byte[totalOctets];
int pos = 0;
for (int i = 0; i < count; ++i)
{
byte[] octets = octetStrings[i].str;
Array.Copy(octets, 0, str, pos, octets.Length);
pos += octets.Length;
}
Debug.Assert(pos == totalOctets);
return str;
}
}
}
private static Asn1OctetString[] ToOctetStringArray(IEnumerable e)
{
IList list = Platform.CreateArrayList(e);
int count = list.Count;
Asn1OctetString[] v = new Asn1OctetString[count];
for (int i = 0; i < count; ++i)
{
v[i] = Asn1OctetString.GetInstance(list[i]);
}
return v;
}
private readonly int chunkSize;
private readonly Asn1OctetString[] octs;
[Obsolete("Will be removed")]
public BerOctetString(IEnumerable e)
: this(ToOctetStringArray(e))
{
}
public BerOctetString(byte[] str)
: this(str, DefaultChunkSize)
{
}
public BerOctetString(Asn1OctetString[] octs)
: this(octs, DefaultChunkSize)
{
}
public BerOctetString(byte[] str, int chunkSize)
: this(str, null, chunkSize)
{
}
public BerOctetString(Asn1OctetString[] octs, int chunkSize)
: this(FlattenOctetStrings(octs), octs, chunkSize)
{
}
private BerOctetString(byte[] str, Asn1OctetString[] octs, int chunkSize)
: base(str)
{
this.octs = octs;
this.chunkSize = chunkSize;
}
/**
* return the DER octets that make up this string.
*/
public IEnumerator GetEnumerator()
{
if (octs == null)
return new ChunkEnumerator(str, chunkSize);
return octs.GetEnumerator();
}
[Obsolete("Use GetEnumerator() instead")]
public IEnumerator GetObjects()
{
return GetEnumerator();
}
internal override void Encode(Asn1OutputStream asn1Out, bool withID)
{
if (asn1Out.IsBer)
{
if (withID)
{
asn1Out.WriteByte(Asn1Tags.Constructed | Asn1Tags.OctetString);
}
asn1Out.WriteByte(0x80);
foreach (Asn1OctetString oct in this)
{
oct.Encode(asn1Out, true);
}
asn1Out.WriteByte(0x00);
asn1Out.WriteByte(0x00);
}
else
{
base.Encode(asn1Out, withID);
}
}
private class ChunkEnumerator
: IEnumerator
{
private readonly byte[] octets;
private readonly int chunkSize;
private DerOctetString currentChunk = null;
private int nextChunkPos = 0;
internal ChunkEnumerator(byte[] octets, int chunkSize)
{
this.octets = octets;
this.chunkSize = chunkSize;
}
public object Current
{
get
{
if (null == currentChunk)
throw new InvalidOperationException();
return currentChunk;
}
}
public bool MoveNext()
{
if (nextChunkPos >= octets.Length)
{
this.currentChunk = null;
return false;
}
int length = System.Math.Min(octets.Length - nextChunkPos, chunkSize);
byte[] chunk = new byte[length];
Array.Copy(octets, nextChunkPos, chunk, 0, length);
this.currentChunk = new DerOctetString(chunk);
this.nextChunkPos += length;
return true;
}
public void Reset()
{
this.currentChunk = null;
this.nextChunkPos = 0;
}
}
}
}
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