\feffusing System;
+using System.Linq;
using System.Text;
-
-using System.Collections;
using System.Collections.Generic;
namespace Novacoin
/// <summary>
/// Initializes new instance of CScript and fills it with supplied bytes
/// </summary>
- /// <param name="bytes">List of bytes</param>
- public CScript(IList<byte> bytes)
+ /// <param name="bytes">Enumerator interface for byte sequence</param>
+ public CScript(IEnumerable<byte> bytes)
{
codeBytes = new List<byte>(bytes);
}
/// <summary>
- /// Initializes new instance of CScript and fills it with supplied bytes
+ /// Return a new instance of WrappedList object for current code bytes
/// </summary>
- /// <param name="bytes">Array of bytes</param>
- public CScript(byte[] bytes)
+ /// <returns></returns>
+ public WrappedList<byte> GetWrappedList()
{
- codeBytes = new List<byte>(bytes);
+ return new WrappedList<byte>(codeBytes);
}
/// <summary>
codeBytes.AddRange(hash.hashBytes);
}
+ /// <summary>
+ /// Create new OP_PUSHDATAn operator and add it to opcode bytes list
+ /// </summary>
+ /// <param name="dataBytes">List of data bytes</param>
public void PushData(IList<byte> dataBytes)
{
- if (dataBytes.Count < (int)opcodetype.OP_PUSHDATA1)
+ long nCount = dataBytes.LongCount();
+
+ if (nCount < (int)opcodetype.OP_PUSHDATA1)
{
- codeBytes.Add((byte)dataBytes.Count);
+ // OP_0 and OP_FALSE
+ codeBytes.Add((byte)nCount);
}
- else if (dataBytes.Count < 0xff)
+ else if (nCount < 0xff)
{
+ // OP_PUSHDATA1 0x01 [0x5a]
codeBytes.Add((byte)opcodetype.OP_PUSHDATA1);
- codeBytes.Add((byte)dataBytes.Count);
+ codeBytes.Add((byte)nCount);
}
- else if (dataBytes.Count < 0xffff)
+ else if (nCount < 0xffff)
{
+ // OP_PUSHDATA1 0x00 0x01 [0x5a]
codeBytes.Add((byte)opcodetype.OP_PUSHDATA2);
- byte[] szBytes = BitConverter.GetBytes((short)dataBytes.Count);
- if (BitConverter.IsLittleEndian)
- Array.Reverse(szBytes);
-
+ byte[] szBytes = Interop.BEBytes((ushort)nCount);
codeBytes.AddRange(szBytes);
}
- else if ((uint)dataBytes.Count < 0xffffffff)
+ else if (nCount < 0xffffffff)
{
- codeBytes.Add((byte)opcodetype.OP_PUSHDATA2);
-
- byte[] szBytes = BitConverter.GetBytes((uint)dataBytes.Count);
- if (BitConverter.IsLittleEndian)
- Array.Reverse(szBytes);
+ // OP_PUSHDATA1 0x00 0x00 0x00 0x01 [0x5a]
+ codeBytes.Add((byte)opcodetype.OP_PUSHDATA4);
+ byte[] szBytes = Interop.BEBytes((uint)nCount);
codeBytes.AddRange(szBytes);
}
+
+ // Add data bytes
codeBytes.AddRange(dataBytes);
}
/// <summary>
+ /// Scan code bytes for pattern
+ /// </summary>
+ /// <param name="pattern">Pattern sequence</param>
+ /// <returns>Matches enumerator</returns>
+ private IEnumerable<int> FindPattern(IList<byte> pattern)
+ {
+ for (int i = 0; i < codeBytes.Count; i++)
+ {
+ if (codeBytes.Skip(i).Take(pattern.Count).SequenceEqual(pattern))
+ {
+ yield return i;
+ }
+ }
+ }
+
+ /// <summary>
+ /// Scan code bytes for pattern and remove it
+ /// </summary>
+ /// <param name="pattern">Pattern sequence</param>
+ /// <returns>Matches number</returns>
+ public int RemovePattern(IList<byte> pattern)
+ {
+ List<byte> resultBytes = new List<byte>(codeBytes);
+ int count = 0;
+ int patternLen = pattern.Count;
+
+ foreach (int i in FindPattern(pattern))
+ {
+ resultBytes.RemoveRange(i - count * patternLen, patternLen);
+ count++;
+ }
+
+ codeBytes = resultBytes;
+
+ return count;
+ }
+
+ /// <summary>
+ /// Is it true that script doesn't contain anything except push value operations?
+ /// </summary>
+ /// <returns>Checking result</returns>
+ public bool IsPushonly()
+ {
+ WrappedList<byte> wCodeBytes = new WrappedList<byte>(codeBytes);
+
+ opcodetype opcode; // Current opcode
+ IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
+
+ // Scan opcodes sequence
+ while (ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ {
+ if (opcode > opcodetype.OP_16)
+ {
+ // We don't allow control opcodes here
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ /// <summary>
+ /// Is it true that script doesn't contain non-canonical push operations?
+ /// </summary>
+ /// <returns>Checking result</returns>
+ public bool HashOnlyCanonicalPushes()
+ {
+ WrappedList<byte> wCodeBytes = new WrappedList<byte>(codeBytes);
+
+ opcodetype opcode; // Current opcode
+ IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
+
+ // Scan opcodes sequence
+ while (ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ {
+ byte[] data = pushArgs.ToArray();
+
+ if (opcode < opcodetype.OP_PUSHDATA1 && opcode > opcodetype.OP_0 && (data.Length == 1 && data[0] <= 16))
+ {
+ // Could have used an OP_n code, rather than a 1-byte push.
+ return false;
+ }
+ if (opcode == opcodetype.OP_PUSHDATA1 && data.Length < (int)opcodetype.OP_PUSHDATA1)
+ {
+ // Could have used a normal n-byte push, rather than OP_PUSHDATA1.
+ return false;
+ }
+ if (opcode == opcodetype.OP_PUSHDATA2 && data.Length <= 0xFF)
+ {
+ // Could have used an OP_PUSHDATA1.
+ return false;
+ }
+ if (opcode == opcodetype.OP_PUSHDATA4 && data.LongLength <= 0xFFFF)
+ {
+ // Could have used an OP_PUSHDATA2.
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ /// <summary>
+ /// Quick test for pay-to-script-hash CScripts
+ /// </summary>
+ /// <returns>Checking result</returns>
+ public bool IsPayToScriptHash()
+ {
+ return (codeBytes.Count() == 23 &&
+ codeBytes[0] == (byte)opcodetype.OP_HASH160 &&
+ codeBytes[1] == 0x14 &&
+ codeBytes[22] == (byte)opcodetype.OP_EQUAL);
+ }
+
+ /// <summary>
+ /// Pre-version-0.6, Bitcoin always counted CHECKMULTISIGs
+ /// as 20 sigops. With pay-to-script-hash, that changed:
+ /// CHECKMULTISIGs serialized in scriptSigs are
+ /// counted more accurately, assuming they are of the form
+ /// ... OP_N CHECKMULTISIG ...
+ /// </summary>
+ /// <param name="fAccurate">Legacy mode flag</param>
+ /// <returns>Amount of sigops</returns>
+ public int GetSigOpCount(bool fAccurate)
+ {
+ WrappedList<byte> wCodeBytes = new WrappedList<byte>(codeBytes);
+
+ opcodetype opcode; // Current opcode
+ IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
+
+ int nCount = 0;
+ opcodetype lastOpcode = opcodetype.OP_INVALIDOPCODE;
+
+ // Scan opcodes sequence
+ while (ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ {
+ if (opcode == opcodetype.OP_CHECKSIG || opcode == opcodetype.OP_CHECKSIGVERIFY)
+ {
+ nCount++;
+ }
+ else if (opcode == opcodetype.OP_CHECKMULTISIG || opcode == opcodetype.OP_CHECKMULTISIGVERIFY)
+ {
+ if (fAccurate && lastOpcode >= opcodetype.OP_1 && lastOpcode <= opcodetype.OP_16)
+ {
+ nCount += ScriptOpcode.DecodeOP_N(lastOpcode);
+ }
+ else
+ {
+ nCount += 20;
+ }
+ }
+ }
+
+ return nCount;
+ }
+
+ /// <summary>
+ /// Accurately count sigOps, including sigOps in
+ /// pay-to-script-hash transactions
+ /// </summary>
+ /// <param name="scriptSig">pay-to-script-hash scriptPubKey</param>
+ /// <returns>SigOps count</returns>
+ public int GetSigOpCount(CScript scriptSig)
+ {
+ if (!IsPayToScriptHash())
+ {
+ return GetSigOpCount(true);
+ }
+
+ // This is a pay-to-script-hash scriptPubKey;
+ // get the last item that the scriptSig
+ // pushes onto the stack:
+ WrappedList<byte> wScriptSig = scriptSig.GetWrappedList();
+
+ opcodetype opcode; // Current opcode
+ IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
+
+ while (ScriptOpcode.GetOp(ref wScriptSig, out opcode, out pushArgs))
+ {
+ if (opcode > opcodetype.OP_16)
+ {
+ return 0;
+ }
+ }
+
+ /// ... and return its opcount:
+ CScript subScript = new CScript(pushArgs);
+
+ return subScript.GetSigOpCount(true);
+
+ }
+
+ public void SetDestination(CKeyID ID)
+ {
+ codeBytes.Clear();
+ AddOp(opcodetype.OP_DUP);
+ AddOp(opcodetype.OP_HASH160);
+ AddHash(ID);
+ AddOp(opcodetype.OP_EQUAL);
+ }
+
+ public void SetDestination(CScriptID ID)
+ {
+ codeBytes.Clear();
+ AddOp(opcodetype.OP_HASH160);
+ AddHash(ID);
+ AddOp(opcodetype.OP_EQUAL);
+ }
+
+ public void SetMultiSig(int nRequired, IEnumerable<CPubKey> keys)
+ {
+ codeBytes.Clear();
+ AddOp(ScriptOpcode.EncodeOP_N(nRequired));
+
+ foreach (CPubKey key in keys)
+ {
+ PushData(key.Public.ToList());
+ }
+ AddOp(ScriptOpcode.EncodeOP_N(keys.Count()));
+ AddOp(opcodetype.OP_CHECKMULTISIG);
+ }
+
+ /// <summary>
/// Disassemble current script code
/// </summary>
/// <returns>Code listing</returns>
public override string ToString()
{
StringBuilder sb = new StringBuilder();
-
WrappedList<byte> wCodeBytes = new WrappedList<byte>(codeBytes);
- while (wCodeBytes.ItemsLeft > 0)
+ opcodetype opcode; // Current opcode
+ IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
+ while (ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
if (sb.Length != 0)
{
sb.Append(" ");
}
- opcodetype opcode;
- IEnumerable<byte> pushArgs;
- if (!ScriptOpcode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
- {
- sb.Append("[error]");
- break;
- }
-
if (0 <= opcode && opcode <= opcodetype.OP_PUSHDATA4)
{
sb.Append(ScriptOpcode.ValueString(pushArgs));
git://git.novaco.in / NovacoinLibrary.git / blobdiff