-\feffusing System;
+\feff/**
+ * Novacoin classes library
+ * Copyright (C) 2015 Alex D. (balthazar.ad@gmail.com)
+
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+using System;
using System.Linq;
using System.Text;
using System.Collections.Generic;
+using System.Diagnostics.Contracts;
namespace Novacoin
{
- public class CScriptException : Exception
- {
- public CScriptException()
- {
- }
-
- public CScriptException(string message)
- : base(message)
- {
- }
-
- public CScriptException(string message, Exception inner)
- : base(message, inner)
- {
- }
- }
-
/// <summary>
/// Representation of script code
/// </summary>
/// Initializes new instance of CScript and fills it with supplied bytes
/// </summary>
/// <param name="bytes">Enumerator interface for byte sequence</param>
- public CScript(IEnumerable<byte> bytes)
+ public CScript(byte[] bytes)
{
codeBytes = new List<byte>(bytes);
}
/// <summary>
- /// Return a new instance of WrappedList object for current code bytes
+ /// Return a new instance of ByteQueue object for current code bytes
/// </summary>
/// <returns></returns>
- public WrappedList<byte> GetWrappedList()
+ public ByteQueue GetByteQueue()
{
- return new WrappedList<byte>(codeBytes);
+ return new ByteQueue(ref codeBytes);
}
/// <summary>
- /// Adds specified operation to opcode bytes list
+ /// Adds specified operation to instruction list
/// </summary>
/// <param name="opcode"></param>
- public void AddOp(opcodetype opcode)
+ public void AddInstruction(instruction opcode)
{
- if (opcode < opcodetype.OP_0 || opcode > opcodetype.OP_INVALIDOPCODE)
- {
- throw new CScriptException("CScript::AddOp() : invalid opcode");
- }
+ Contract.Requires<ArgumentException>(opcode >= instruction.OP_0 && opcode <= instruction.OP_INVALIDOPCODE, "Invalid instruction.");
codeBytes.Add((byte)opcode);
}
/// <summary>
- /// Adds hash to opcode bytes list.
+ /// Adds hash to instruction list.
/// New items are added in this format:
/// hash_length_byte hash_bytes
/// </summary>
public void AddHash(Hash160 hash)
{
codeBytes.Add((byte)hash.hashSize);
- codeBytes.AddRange(hash.hashBytes);
+ codeBytes.AddRange((byte[])hash);
}
/// <summary>
- /// Adds hash to opcode bytes list.
+ /// Adds hash to instruction list.
/// New items are added in this format:
/// hash_length_byte hash_bytes
/// </summary>
public void AddHash(Hash256 hash)
{
codeBytes.Add((byte)hash.hashSize);
- codeBytes.AddRange(hash.hashBytes);
+ codeBytes.AddRange((byte[])hash);
}
/// <summary>
- /// Create new OP_PUSHDATAn operator and add it to opcode bytes list
+ /// Create new OP_PUSHDATAn operator and add it to instruction list
/// </summary>
- /// <param name="dataBytes">List of data bytes</param>
- public void PushData(IList<byte> dataBytes)
+ /// <param name="dataBytes">Set of data bytes</param>
+ public void PushData(byte[] dataBytes)
{
- long nCount = dataBytes.LongCount();
+ var nCount = dataBytes.LongLength;
- if (nCount < (int)opcodetype.OP_PUSHDATA1)
+ if (nCount < (int)instruction.OP_PUSHDATA1)
{
// OP_0 and OP_FALSE
codeBytes.Add((byte)nCount);
else if (nCount < 0xff)
{
// OP_PUSHDATA1 0x01 [0x5a]
- codeBytes.Add((byte)opcodetype.OP_PUSHDATA1);
+ codeBytes.Add((byte)instruction.OP_PUSHDATA1);
codeBytes.Add((byte)nCount);
}
else if (nCount < 0xffff)
{
- // OP_PUSHDATA1 0x00 0x01 [0x5a]
- codeBytes.Add((byte)opcodetype.OP_PUSHDATA2);
+ // OP_PUSHDATA1 0x01 0x00 [0x5a]
+ codeBytes.Add((byte)instruction.OP_PUSHDATA2);
- byte[] szBytes = Interop.BEBytes((ushort)nCount);
+ var szBytes = BitConverter.GetBytes((ushort)nCount);
codeBytes.AddRange(szBytes);
}
else if (nCount < 0xffffffff)
{
- // OP_PUSHDATA1 0x00 0x00 0x00 0x01 [0x5a]
- codeBytes.Add((byte)opcodetype.OP_PUSHDATA4);
+ // OP_PUSHDATA1 0x01 0x00 0x00 0x00 [0x5a]
+ codeBytes.Add((byte)instruction.OP_PUSHDATA4);
- byte[] szBytes = Interop.BEBytes((uint)nCount);
+ var szBytes = BitConverter.GetBytes((uint)nCount);
codeBytes.AddRange(szBytes);
}
}
/// <summary>
- /// Scan code bytes for pattern
+ /// Just insert data array without including any prefixes. Please make sure that you know what you're doing,
+ /// it is recommended to use AddInstruction, AddHash or PushData instead.
+ /// </summary>
+ /// <param name="dataBytes">Data bytes</param>
+ public void AddRawData(byte[] dataBytes)
+ {
+ // Add data bytes
+ codeBytes.AddRange(dataBytes);
+ }
+
+ /// <summary>
+ /// Scan pushed data bytes for pattern and, in case of exact match, remove it.
/// </summary>
/// <param name="pattern">Pattern sequence</param>
- /// <returns>Matches enumerator</returns>
- private IEnumerable<int> FindPattern(IList<byte> pattern)
+ /// <returns>Matches count</returns>
+ public int RemovePattern(byte[] pattern)
{
- for (int i = 0; i < codeBytes.Count; i++)
+ // There is no sense to continue if pattern is empty or longer than script itself
+ if (pattern.Length == 0 || pattern.Length > codeBytes.Count)
{
- if (codeBytes.Skip(i).Take(pattern.Count).SequenceEqual(pattern))
+ return 0;
+ }
+
+ var count = 0;
+ var bq1 = new ByteQueue(ref codeBytes);
+
+ byte[] pushData;
+ instruction opcode;
+
+ var newScript = new CScript();
+
+ while (ScriptCode.GetOp(ref bq1, out opcode, out pushData))
+ {
+ if (pushData.Length == 0)
{
- yield return i;
+ // No data, put instruction on its place
+ newScript.AddInstruction(opcode);
}
+ else if (!pushData.SequenceEqual(pattern))
+ {
+ // No match, create push operator
+ newScript.PushData(pushData);
+ }
+ else
+ {
+ count++; // match
+ }
+ }
+
+ if (count > 0)
+ {
+ // Replace current script if any matches were found
+ codeBytes = newScript.codeBytes;
}
+
+ return count;
}
/// <summary>
- /// Scan code bytes for pattern and remove it
+ /// Scan script for specific instruction and remove it if there are some matches.
/// </summary>
- /// <param name="pattern">Pattern sequence</param>
- /// <returns>Matches number</returns>
- public int RemovePattern(IList<byte> pattern)
+ /// <param name="op">Instruction</param>
+ /// <returns>Matches count</returns>
+ public int RemoveInstruction(instruction op)
{
- List<byte> resultBytes = new List<byte>(codeBytes);
- int count = 0;
- int patternLen = pattern.Count;
-
- foreach (int i in FindPattern(pattern))
+ byte[] pushData;
+ instruction opcode;
+
+ var count = 0;
+ var newScript = new CScript();
+ var bq1 = new ByteQueue(ref codeBytes);
+
+ while (ScriptCode.GetOp(ref bq1, out opcode, out pushData))
+ {
+ if (pushData.Length != 0 && op != opcode)
+ {
+ // If instruction didn't match then push its data again
+ newScript.PushData(pushData);
+ }
+ else if (Enum.IsDefined(typeof(instruction), op) && op != opcode)
+ {
+ // Instruction didn't match
+ newScript.AddInstruction(opcode);
+ }
+ else
+ {
+ count++; // match
+ }
+ }
+
+ if (count > 0)
{
- resultBytes.RemoveRange(i - count * patternLen, patternLen);
- count++;
+ // Replace current script if any matches were found
+ codeBytes = newScript.codeBytes;
}
- 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()
+ public bool IsPushOnly
{
- WrappedList<byte> wCodeBytes = new WrappedList<byte>(codeBytes);
-
- opcodetype opcode; // Current opcode
- IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
-
- // Scan opcodes sequence
- while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ get
{
- if (opcode > opcodetype.OP_16)
+ var wCodeBytes = new ByteQueue(ref codeBytes);
+
+ instruction opcode; // Current instruction
+ byte[] pushArgs; // OP_PUSHDATAn argument
+
+ // Scan instructions sequence
+ while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
- // We don't allow control opcodes here
- return false;
+ if (opcode > instruction.OP_16)
+ {
+ // We don't allow control instructions here
+ return false;
+ }
}
- }
- return true;
+ return true;
+ }
}
/// <summary>
/// Is it true that script doesn't contain non-canonical push operations?
/// </summary>
- /// <returns>Checking result</returns>
- public bool HashOnlyCanonicalPushes()
+ public bool HasOnlyCanonicalPushes
{
- WrappedList<byte> wCodeBytes = new WrappedList<byte>(codeBytes);
-
- opcodetype opcode; // Current opcode
- IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
-
- // Scan opcodes sequence
- while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
+ get
{
- byte[] data = pushArgs.ToArray();
+ var wCodeBytes = new ByteQueue(ref codeBytes);
- 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)
+ byte[] pushArgs; // OP_PUSHDATAn argument
+ instruction opcode; // Current instruction
+
+ // Scan instructions sequence
+ while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
- // Could have used an OP_PUSHDATA2.
- return false;
+ var data = pushArgs;
+
+ if (opcode < instruction.OP_PUSHDATA1 && opcode > instruction.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 == instruction.OP_PUSHDATA1 && data.Length < (int)instruction.OP_PUSHDATA1)
+ {
+ // Could have used a normal n-byte push, rather than OP_PUSHDATA1.
+ return false;
+ }
+ if (opcode == instruction.OP_PUSHDATA2 && data.Length <= 0xFF)
+ {
+ // Could have used an OP_PUSHDATA1.
+ return false;
+ }
+ if (opcode == instruction.OP_PUSHDATA4 && data.LongLength <= 0xFFFF)
+ {
+ // Could have used an OP_PUSHDATA2.
+ return false;
+ }
}
- }
- return true;
+ return true;
+ }
}
/// <summary>
/// Quick test for pay-to-script-hash CScripts
/// </summary>
- /// <returns>Checking result</returns>
- public bool IsPayToScriptHash()
+ public bool IsPayToScriptHash
{
- // Sender provides redeem script hash, receiver provides signature list and redeem script
- // OP_HASH160 20 [20 byte hash] OP_EQUAL
- return (codeBytes.Count() == 23 &&
- codeBytes[0] == (byte)opcodetype.OP_HASH160 &&
- codeBytes[1] == 0x14 && // 20 bytes hash length prefix
- codeBytes[22] == (byte)opcodetype.OP_EQUAL);
+ get
+ {
+ // Sender provides redeem script hash, receiver provides signature list and redeem script
+ // OP_HASH160 20 [20 byte hash] OP_EQUAL
+ return (codeBytes.Count() == 23 &&
+ codeBytes[0] == (byte)instruction.OP_HASH160 &&
+ codeBytes[1] == 0x14 && // 20 bytes hash length prefix
+ codeBytes[22] == (byte)instruction.OP_EQUAL);
+ }
}
/// <summary>
/// Quick test for pay-to-pubkeyhash CScripts
/// </summary>
- /// <returns>Checking result</returns>
- public bool IsPayToPubKeyHash()
+ public bool IsPayToPubKeyHash
{
- // Sender provides hash of pubkey, receiver provides signature and pubkey
- // OP_DUP OP_HASH160 20 [20 byte hash] OP_EQUALVERIFY OP_CHECKSIG
-
- return (codeBytes.Count == 25 &&
- codeBytes[0] == (byte) opcodetype.OP_DUP &&
- codeBytes[1] == (byte)opcodetype.OP_HASH160 &&
- codeBytes[2] == 0x14 && // 20 bytes hash length prefix
- codeBytes[23] == (byte)opcodetype.OP_EQUALVERIFY &&
- codeBytes[24] == (byte)opcodetype.OP_CHECKSIG);
+ get
+ {
+ // Sender provides hash of pubkey, receiver provides signature and pubkey
+ // OP_DUP OP_HASH160 20 [20 byte hash] OP_EQUALVERIFY OP_CHECKSIG
+ return (codeBytes.Count == 25 &&
+ codeBytes[0] == (byte)instruction.OP_DUP &&
+ codeBytes[1] == (byte)instruction.OP_HASH160 &&
+ codeBytes[2] == 0x14 && // 20 bytes hash length prefix
+ codeBytes[23] == (byte)instruction.OP_EQUALVERIFY &&
+ codeBytes[24] == (byte)instruction.OP_CHECKSIG);
+ }
+ }
+
+ /// <summary>
+ /// Quick test for Null destination
+ /// </summary>
+ public bool IsNull
+ {
+ get { return codeBytes.Count == 0; }
}
/// <summary>
/// </summary>
/// <param name="fAccurate">Legacy mode flag</param>
/// <returns>Amount of sigops</returns>
- public int GetSigOpCount(bool fAccurate)
+ public uint GetSigOpCount(bool fAccurate)
{
- WrappedList<byte> wCodeBytes = new WrappedList<byte>(codeBytes);
+ var wCodeBytes = new ByteQueue(ref codeBytes);
- opcodetype opcode; // Current opcode
- IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
+ instruction opcode; // Current instruction
+ byte[] pushArgs; // OP_PUSHDATAn argument
- int nCount = 0;
- opcodetype lastOpcode = opcodetype.OP_INVALIDOPCODE;
+ uint nCount = 0;
+ var lastOpcode = instruction.OP_INVALIDOPCODE;
- // Scan opcodes sequence
+ // Scan instructions sequence
while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
- if (opcode == opcodetype.OP_CHECKSIG || opcode == opcodetype.OP_CHECKSIGVERIFY)
+ if (opcode == instruction.OP_CHECKSIG || opcode == instruction.OP_CHECKSIGVERIFY)
{
nCount++;
}
- else if (opcode == opcodetype.OP_CHECKMULTISIG || opcode == opcodetype.OP_CHECKMULTISIGVERIFY)
+ else if (opcode == instruction.OP_CHECKMULTISIG || opcode == instruction.OP_CHECKMULTISIGVERIFY)
{
- if (fAccurate && lastOpcode >= opcodetype.OP_1 && lastOpcode <= opcodetype.OP_16)
+ if (fAccurate && lastOpcode >= instruction.OP_1 && lastOpcode <= instruction.OP_16)
{
- nCount += ScriptCode.DecodeOP_N(lastOpcode);
+ nCount += (uint)ScriptCode.DecodeOP_N(lastOpcode);
}
else
{
/// </summary>
/// <param name="scriptSig">pay-to-script-hash scriptPubKey</param>
/// <returns>SigOps count</returns>
- public int GetSigOpCount(CScript scriptSig)
+ public uint GetSigOpCount(CScript scriptSig)
{
- if (!IsPayToScriptHash())
+ 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();
+ ByteQueue wScriptSig = scriptSig.GetByteQueue();
+ int nScriptSigSize = scriptSig.Size;
- opcodetype opcode; // Current opcode
- IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
+ instruction opcode; // Current instruction
+ byte[] pushArgs = new byte[0]; // OP_PUSHDATAn argument
- while (ScriptCode.GetOp(ref wScriptSig, out opcode, out pushArgs))
+
+ while (wScriptSig.Index < nScriptSigSize)
{
- if (opcode > opcodetype.OP_16)
+ if (!ScriptCode.GetOp(ref wScriptSig, out opcode, out pushArgs))
+ {
+ return 0;
+ }
+
+ if (opcode > instruction.OP_16)
{
return 0;
}
}
/// ... and return its opcount:
- CScript subScript = new CScript(pushArgs);
+ var subScript = new CScript(pushArgs);
return subScript.GetSigOpCount(true);
}
+ /// <summary>
+ /// Set pay-to-pubkey destination.
+ /// </summary>
+ /// <param name="pubKey">Instance of CPubKey.</param>
+ public void SetDestination(CPubKey pubKey)
+ {
+ codeBytes.Clear();
+ PushData(pubKey);
+ AddInstruction(instruction.OP_CHECKSIG);
+ }
+
+ /// <summary>
+ /// Set pay-to-pubkeyhash destination
+ /// </summary>
+ /// <param name="ID">Public key hash</param>
public void SetDestination(CKeyID ID)
{
codeBytes.Clear();
- AddOp(opcodetype.OP_DUP);
- AddOp(opcodetype.OP_HASH160);
+ AddInstruction(instruction.OP_DUP);
+ AddInstruction(instruction.OP_HASH160);
AddHash(ID);
- AddOp(opcodetype.OP_EQUAL);
+ AddInstruction(instruction.OP_EQUALVERIFY);
+ AddInstruction(instruction.OP_CHECKSIG);
}
+ /// <summary>
+ /// Set pay-to-scripthash destination
+ /// </summary>
+ /// <param name="ID">Script hash</param>
public void SetDestination(CScriptID ID)
{
codeBytes.Clear();
- AddOp(opcodetype.OP_HASH160);
+ AddInstruction(instruction.OP_HASH160);
AddHash(ID);
- AddOp(opcodetype.OP_EQUAL);
+ AddInstruction(instruction.OP_EQUAL);
+ }
+
+ /// <summary>
+ /// Reset script code buffer.
+ /// </summary>
+ public void SetNullDestination()
+ {
+ codeBytes.Clear();
}
- public void SetMultiSig(int nRequired, IEnumerable<CPubKey> keys)
+ /// <summary>
+ /// Set multisig destination.
+ /// </summary>
+ /// <param name="nRequired">Amount of required signatures.</param>
+ /// <param name="keys">Set of public keys.</param>
+ public void SetMultiSig(int nRequired, CPubKey[] keys)
{
codeBytes.Clear();
- AddOp(ScriptCode.EncodeOP_N(nRequired));
+ AddInstruction(ScriptCode.EncodeOP_N(nRequired));
- foreach (CPubKey key in keys)
+ foreach (var key in keys)
{
- PushData(key.Public.ToList());
+ PushData(key);
}
- AddOp(ScriptCode.EncodeOP_N(keys.Count()));
- AddOp(opcodetype.OP_CHECKMULTISIG);
+
+ AddInstruction(ScriptCode.EncodeOP_N(keys.Length));
+ AddInstruction(instruction.OP_CHECKMULTISIG);
}
/// <summary>
- /// Access to scrypt code.
+ /// Access to script code.
/// </summary>
- public IEnumerable<byte> Enumerable
+ public static implicit operator byte[] (CScript script)
{
- get { return codeBytes; }
+ return script.codeBytes.ToArray();
+ }
+
+ /// <summary>
+ /// Script size
+ /// </summary>
+ public int Size
+ {
+ get { return codeBytes.Count; }
+ }
+
+ public CScriptID ScriptID
+ {
+ get { return new CScriptID(Hash160.Compute160(codeBytes.ToArray())); }
}
/// <summary>
/// <returns>Code listing</returns>
public override string ToString()
{
- StringBuilder sb = new StringBuilder();
- WrappedList<byte> wCodeBytes = new WrappedList<byte>(codeBytes);
+ var sb = new StringBuilder();
+ var wCodeBytes = new ByteQueue(ref codeBytes);
- opcodetype opcode; // Current opcode
- IEnumerable<byte> pushArgs; // OP_PUSHDATAn argument
+ instruction opcode; // Current instruction
+ byte[] pushArgs; // OP_PUSHDATAn argument
while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
if (sb.Length != 0)
sb.Append(" ");
}
- if (0 <= opcode && opcode <= opcodetype.OP_PUSHDATA4)
+ if (0 <= opcode && opcode <= instruction.OP_PUSHDATA4)
{
sb.Append(ScriptCode.ValueString(pushArgs));
}
}
}
}
-
git://git.novaco.in / NovacoinLibrary.git / blobdiff