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Merge pull request #60 from twostack/expose-pre-image
V2 Refactor
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| import 'dart:typed_data'; | ||
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| import 'package:dartsv/dartsv.dart'; | ||
| import 'package:hex/hex.dart'; | ||
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| /// Utility class to represent a parsed 'token' in the encoded script. | ||
| class ScriptChunk { | ||
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| List<int> _buf; | ||
| int _len; | ||
| int _opcodenum; | ||
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| ///Construct a ScriptChunk | ||
| /// | ||
| /// [_buf] - Buffer containing data in case of OP_PUSHDATA | ||
| /// | ||
| /// [_len] - length of _buf | ||
| /// | ||
| /// [_opcodenum] - Bitcoin script OpCode. See [OpCodes]. | ||
| /// | ||
| ScriptChunk(this._buf, this._len, this._opcodenum); | ||
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| /// Returns this script chunk's numeric opcode | ||
| /// | ||
| int get opcodenum => _opcodenum; | ||
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| /// Sets this script chunk's numeric opcode | ||
| /// | ||
| set opcodenum(int value) { | ||
| _opcodenum = value; | ||
| } | ||
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| /// Returns the length of the buffer in case of PUSHDATAx instruction. Zero otherwise. | ||
| /// | ||
| int get len => _len; | ||
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| /// Sets the length of data contained in PUSHDATAx instruction. Zero otherwise. | ||
| /// | ||
| set len(int value) { | ||
| _len = value; | ||
| } | ||
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| /// Returns the byte array containing the data from a PUSHDATAx instruction. | ||
| /// | ||
| List<int> get buf => _buf; | ||
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| /// Sets the byte array of representing PUSHDATAx instruction. | ||
| /// | ||
| set buf(List<int> value) { | ||
| _buf = value; | ||
| } | ||
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| bool equalsOpCode(int opcode) { | ||
| return opcode == _opcodenum; | ||
| } | ||
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| /** | ||
| * If this chunk is a single byte of non-pushdata content (could be OP_RESERVED or some invalid Opcode) | ||
| */ | ||
| bool isOpCode() { | ||
| return _opcodenum > OpCodes.OP_PUSHDATA4; | ||
| } | ||
|
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| /** | ||
| * Returns true if this chunk is pushdata content, including the single-byte pushdatas. | ||
| */ | ||
| bool isPushData() { | ||
| return _opcodenum <= OpCodes.OP_16; | ||
| } | ||
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| /** If this chunk is an OP_N opcode returns the equivalent integer value. */ | ||
| int decodeOpN() { | ||
| return SVScript.decodeFromOpN(_opcodenum); | ||
| } | ||
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| int size() { | ||
| final int opcodeLength = 1; | ||
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| int pushDataSizeLength = 0; | ||
| if (_opcodenum == OpCodes.OP_PUSHDATA1) pushDataSizeLength = 1; | ||
| else if (_opcodenum == OpCodes.OP_PUSHDATA2) pushDataSizeLength = 2; | ||
| else if (_opcodenum == OpCodes.OP_PUSHDATA4) pushDataSizeLength = 4; | ||
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| final int dataLength = _buf == null ? 0 : _buf.length; | ||
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| return opcodeLength + pushDataSizeLength + dataLength; | ||
| } | ||
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| /// Checks to see if the PUSHDATA instruction is using the *smallest* pushdata opcode it can. | ||
| /// | ||
| /// [i] - Index of ScriptChunk. This should be a pushdata instruction. | ||
| /// | ||
| /// Returns true if the *smallest* pushdata opcode was used. | ||
| bool checkMinimalPush(int i) { | ||
|
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| if (_buf.isEmpty) { | ||
| // Could have used OP_0. | ||
| return (_opcodenum == OpCodes.OP_0); | ||
| } else if (_buf.length == 1 && buf[0] >= 1 && buf[0] <= 16) { | ||
| // Could have used OP_1 .. OP_16. | ||
| return _opcodenum == OpCodes.OP_1 + (buf[0] - 1); | ||
| } else if (_buf.length == 1 && buf[0] == 0x81) { | ||
| // Could have used OP_1NEGATE | ||
| return _opcodenum == OpCodes.OP_1NEGATE; | ||
| } else if (_buf.length <= 75) { | ||
| // Could have used a direct push (opcode indicating number of bytes pushed + those bytes). | ||
| return _opcodenum == buf.length; | ||
| } else if (_buf.length <= 255) { | ||
| // Could have used OP_PUSHDATA. | ||
| return _opcodenum == OpCodes.OP_PUSHDATA1; | ||
| } else if (_buf.length <= 65535) { | ||
| // Could have used OP_PUSHDATA2. | ||
| return _opcodenum == OpCodes.OP_PUSHDATA2; | ||
| } | ||
| return true; | ||
| } | ||
|
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| String toEncodedString(bool asm){ | ||
| StringBuffer str = new StringBuffer(); | ||
| if (_buf == null || _buf.length <= 0) { | ||
|
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| // no data chunk | ||
| if (!OpCodes.getOpCodeName(opcodenum).startsWith("NON_OP")) { | ||
| if (asm) { | ||
| // A few cases where the opcode name differs from reverseMap | ||
| // aside from 1 to 16 data pushes. | ||
| if (opcodenum == 0) { | ||
| // OP_0 -> 0 | ||
| str.write("0"); | ||
| } else if (opcodenum == 79) { | ||
| // OP_1NEGATE -> 1 | ||
| str.write("-1"); | ||
| } else { | ||
| str.write( OpCodes.getOpCodeName(opcodenum)); | ||
| } | ||
| } else { | ||
| str.write( OpCodes.getOpCodeName(opcodenum)); | ||
| } | ||
| } else { | ||
| String numstr = HEX.encode([opcodenum]); | ||
|
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| //uneven numbers get padded with a leading zero | ||
| if (numstr.length % 2 != 0) { | ||
| numstr = "0" + numstr; | ||
| } | ||
| if (asm) { | ||
| str.write( numstr); | ||
| } else { | ||
| str.write("0x" + numstr); | ||
| } | ||
| } | ||
| } else { | ||
| // data chunk | ||
| if (!asm && (opcodenum == OpCodes.OP_PUSHDATA1 || | ||
| opcodenum == OpCodes.OP_PUSHDATA2 || | ||
| opcodenum == OpCodes.OP_PUSHDATA4)) { | ||
| str.write( OpCodes.getOpCodeName(opcodenum) + " "); | ||
| } | ||
| if (_buf.length > 0) { | ||
| if (asm) { | ||
| str.write(HEX.encode(_buf)); | ||
| } else { | ||
| str.write("${_buf.length} 0x${HEX.encode(_buf)}"); | ||
| } | ||
| } | ||
| } | ||
| return str.toString(); | ||
| } | ||
|
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||
|
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
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| import 'dart:core'; | ||
| import 'dart:core'; | ||
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| enum ScriptError { | ||
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| SCRIPT_ERR_OK("OK"), | ||
| SCRIPT_ERR_UNKNOWN_ERROR("UNKNOWN_ERROR"), | ||
| SCRIPT_ERR_EVAL_FALSE("EVAL_FALSE"), | ||
| SCRIPT_ERR_OP_RETURN("OP_RETURN"), | ||
| SCRIPT_ERR_SPLIT_RANGE("SPLIT_RANGE"), | ||
| SCRIPT_ERR_INVALID_NUMBER_RANGE("INVALID_NUMBER_RANGE"), | ||
| SCRIPT_ERR_NUMBER_OVERFLOW("SCRIPTNUM_OVERFLOW"), | ||
| SCRIPT_ERR_NUMBER_MINENCODE("SCRIPTNUM_MINENCODE"), | ||
| SCRIPT_ERR_DIV_BY_ZERO("DIV_BY_ZERO"), | ||
| SCRIPT_ERR_MOD_BY_ZERO("MOD_BY_ZERO"), | ||
| SCRIPT_ERR_NONCOMPRESSED_PUBKEY("NONCOMPRESSED_PUBKEY"), | ||
| SCRIPT_ERR_ILLEGAL_FORKID("ILLEGAL_FORKID"), | ||
| SCRIPT_ERR_SIGHASH_FORKID("SIGHASH_FORKID"), | ||
| SCRIPT_ERR_MUST_USE_FORKID("MUST_USE_FORKID"), | ||
|
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| /* Max sizes */ | ||
| SCRIPT_ERR_SCRIPT_SIZE("SCRIPT_SIZE"), | ||
| SCRIPT_ERR_PUSH_SIZE("PUSH_SIZE"), | ||
| SCRIPT_ERR_OP_COUNT("OP_COUNT"), | ||
| SCRIPT_ERR_STACK_SIZE("STACK_SIZE"), | ||
| SCRIPT_ERR_SIG_COUNT("SIG_COUNT"), | ||
| SCRIPT_ERR_PUBKEY_COUNT("PUBKEY_COUNT"), | ||
| SCRIPT_ERR_OPERAND_SIZE("OPERAND_SIZE"), | ||
|
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| /* Failed verify operations */ | ||
| SCRIPT_ERR_VERIFY("VERIFY"), | ||
| SCRIPT_ERR_EQUALVERIFY("EQUALVERIFY"), | ||
| SCRIPT_ERR_CHECKMULTISIGVERIFY("CHECKMULTISIGVERIFY"), | ||
| SCRIPT_ERR_CHECKSIGVERIFY("CHECKSIGVERIFY"), | ||
| SCRIPT_ERR_NUMEQUALVERIFY("NUMEQUALVERIFY"), | ||
|
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| /* Logical/Format/Canonical errors */ | ||
| SCRIPT_ERR_BAD_OPCODE("BAD_OPCODE"), | ||
| SCRIPT_ERR_DISABLED_OPCODE("DISABLED_OPCODE"), | ||
| SCRIPT_ERR_INVALID_STACK_OPERATION("INVALID_STACK_OPERATION"), | ||
| SCRIPT_ERR_INVALID_ALTSTACK_OPERATION("INVALID_ALTSTACK_OPERATION"), | ||
| SCRIPT_ERR_UNBALANCED_CONDITIONAL("UNBALANCED_CONDITIONAL"), | ||
|
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| /* CHECKLOCKTIMEVERIFY and CHECKSEQUENCEVERIFY */ | ||
| SCRIPT_ERR_NEGATIVE_LOCKTIME("NEGATIVE_LOCKTIME"), | ||
| SCRIPT_ERR_UNSATISFIED_LOCKTIME("UNSATISFIED_LOCKTIME"), | ||
|
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| /* Malleability */ | ||
| SCRIPT_ERR_SIG_HASHTYPE("SIG_HASHTYPE"), | ||
| SCRIPT_ERR_SIG_DER("SIG_DER"), | ||
| SCRIPT_ERR_MINIMALDATA("MINIMALDATA"), | ||
| SCRIPT_ERR_SIG_PUSHONLY("SIG_PUSHONLY"), | ||
| SCRIPT_ERR_SIG_HIGH_S("SIG_HIGH_S"), | ||
| SCRIPT_ERR_SIG_NULLDUMMY("SIG_NULLDUMMY"), | ||
| SCRIPT_ERR_PUBKEYTYPE("PUBKEYTYPE"), | ||
| SCRIPT_ERR_CLEANSTACK("CLEANSTACK"), | ||
| SCRIPT_ERR_MINIMALIF("MINIMALIF"), | ||
| SCRIPT_ERR_SIG_NULLFAIL("NULLFAIL"), | ||
|
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| /* softfork safeness */ | ||
| SCRIPT_ERR_DISCOURAGE_UPGRADABLE_NOPS("DISCOURAGE_UPGRADABLE_NOPS"), | ||
| SCRIPT_ERR_DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM("DISCOURAGE_UPGRADABLE_WITNESS_PROGRAM"), | ||
|
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| /* segregated witness */ | ||
| SCRIPT_ERR_WITNESS_PROGRAM_WRONG_LENGTH("WITNESS_PROGRAM_WRONG_LENGTH"), | ||
| SCRIPT_ERR_WITNESS_PROGRAM_WITNESS_EMPTY("WITNESS_PROGRAM_WITNESS_EMPTY"), | ||
| SCRIPT_ERR_WITNESS_PROGRAM_MISMATCH("WITNESS_PROGRAM_MISMATCH"), | ||
| SCRIPT_ERR_WITNESS_MALLEATED("WITNESS_MALLEATED"), | ||
| SCRIPT_ERR_WITNESS_MALLEATED_P2SH("WITNESS_MALLEATED_P2SH"), | ||
| SCRIPT_ERR_WITNESS_UNEXPECTED("WITNESS_UNEXPECTED"), | ||
| SCRIPT_ERR_WITNESS_PUBKEYTYPE("WITNESS_PUBKEYTYPE"), | ||
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| SCRIPT_ERR_ERROR_COUNT("ERROR_COUNT"); | ||
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| final String _mnemonic; | ||
|
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| const ScriptError(this._mnemonic); | ||
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| String get mnemonic => _mnemonic; | ||
|
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| } |
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