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);
}
/// Return a new instance of ByteQueue object for current code bytes
/// </summary>
/// <returns></returns>
- public ByteQueue GetByteQUeue()
+ public ByteQueue GetByteQueue()
{
- return new ByteQueue(codeBytes);
+ return new ByteQueue(ref codeBytes);
}
/// <summary>
/// <param name="opcode"></param>
public void AddInstruction(instruction opcode)
{
- if (opcode < instruction.OP_0 || opcode > instruction.OP_INVALIDOPCODE)
- {
- throw new CScriptException("CScript::AddInstruction() : invalid instruction");
- }
+ Contract.Requires<ArgumentException>(opcode >= instruction.OP_0 && opcode <= instruction.OP_INVALIDOPCODE, "Invalid instruction.");
codeBytes.Add((byte)opcode);
}
public void AddHash(Hash160 hash)
{
codeBytes.Add((byte)hash.hashSize);
- codeBytes.AddRange(hash.hashBytes);
+ codeBytes.AddRange((byte[])hash);
}
/// <summary>
public void AddHash(Hash256 hash)
{
codeBytes.Add((byte)hash.hashSize);
- codeBytes.AddRange(hash.hashBytes);
+ codeBytes.AddRange((byte[])hash);
}
/// <summary>
}
else if (nCount < 0xffff)
{
- // OP_PUSHDATA1 0x00 0x01 [0x5a]
+ // 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]
+ // 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(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.Length).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)
+ {
+ // No data, put instruction on its place
+ newScript.AddInstruction(opcode);
+ }
+ else if (!pushData.SequenceEqual(pattern))
+ {
+ // No match, create push operator
+ newScript.PushData(pushData);
+ }
+ else
{
- yield return i;
+ 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(byte[] pattern)
+ /// <param name="op">Instruction</param>
+ /// <returns>Matches count</returns>
+ public int RemoveInstruction(instruction op)
{
- var resultBytes = new List<byte>(codeBytes);
- int count = 0;
-
- 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 * pattern.Length, pattern.Length);
- count++;
+ // Replace current script if any matches were found
+ codeBytes = newScript.codeBytes;
}
- codeBytes = resultBytes;
-
return count;
}
{
get
{
- var wCodeBytes = new ByteQueue(codeBytes);
+ var wCodeBytes = new ByteQueue(ref codeBytes);
- instruction opcode; // Current opcode
+ instruction opcode; // Current instruction
byte[] pushArgs; // OP_PUSHDATAn argument
- // Scan opcodes sequence
+ // Scan instructions sequence
while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
if (opcode > instruction.OP_16)
{
- // We don't allow control opcodes here
+ // We don't allow control instructions here
return false;
}
}
{
get
{
- var wCodeBytes = new ByteQueue(codeBytes);
+ var wCodeBytes = new ByteQueue(ref codeBytes);
byte[] pushArgs; // OP_PUSHDATAn argument
- instruction opcode; // Current opcode
+ instruction opcode; // Current instruction
- // Scan opcodes sequence
+ // Scan instructions sequence
while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
var data = pushArgs;
/// </summary>
/// <param name="fAccurate">Legacy mode flag</param>
/// <returns>Amount of sigops</returns>
- public int GetSigOpCount(bool fAccurate)
+ public uint GetSigOpCount(bool fAccurate)
{
- var wCodeBytes = new ByteQueue(codeBytes);
+ var wCodeBytes = new ByteQueue(ref codeBytes);
- instruction opcode; // Current opcode
+ instruction opcode; // Current instruction
byte[] pushArgs; // OP_PUSHDATAn argument
- int nCount = 0;
+ 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 == instruction.OP_CHECKSIG || opcode == instruction.OP_CHECKSIGVERIFY)
{
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)
{
// This is a pay-to-script-hash scriptPubKey;
// get the last item that the scriptSig
// pushes onto the stack:
- ByteQueue wScriptSig = scriptSig.GetByteQUeue();
+ ByteQueue wScriptSig = scriptSig.GetByteQueue();
+ int nScriptSigSize = scriptSig.Size;
+
+ instruction opcode; // Current instruction
+ byte[] pushArgs = new byte[0]; // OP_PUSHDATAn argument
- instruction opcode; // Current opcode
- byte[] pushArgs; // OP_PUSHDATAn argument
- while (ScriptCode.GetOp(ref wScriptSig, out opcode, out pushArgs))
+ while (wScriptSig.Index < nScriptSigSize)
{
+ if (!ScriptCode.GetOp(ref wScriptSig, out opcode, out pushArgs))
+ {
+ return 0;
+ }
+
if (opcode > instruction.OP_16)
{
return 0;
public void SetDestination(CPubKey pubKey)
{
codeBytes.Clear();
- PushData(pubKey.PublicBytes);
+ PushData(pubKey);
AddInstruction(instruction.OP_CHECKSIG);
}
foreach (var key in keys)
{
- PushData(key.PublicBytes);
+ PushData(key);
}
AddInstruction(ScriptCode.EncodeOP_N(keys.Length));
/// <summary>
/// Access to script code.
/// </summary>
- public byte[] Bytes
+ public static implicit operator byte[] (CScript script)
+ {
+ return script.codeBytes.ToArray();
+ }
+
+ /// <summary>
+ /// Script size
+ /// </summary>
+ public int Size
{
- get { return codeBytes.ToArray(); }
+ get { return codeBytes.Count; }
}
public CScriptID ScriptID
public override string ToString()
{
var sb = new StringBuilder();
- var wCodeBytes = new ByteQueue(codeBytes);
+ var wCodeBytes = new ByteQueue(ref codeBytes);
- instruction opcode; // Current opcode
+ instruction opcode; // Current instruction
byte[] pushArgs; // OP_PUSHDATAn argument
while (ScriptCode.GetOp(ref wCodeBytes, out opcode, out pushArgs))
{
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