73 lines
1.8 KiB
JavaScript
73 lines
1.8 KiB
JavaScript
var bcoin = require('../bcoin');
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var constants = bcoin.protocol.constants;
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var utils = bcoin.protocol.utils;
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var script = exports;
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script.decode = function decode(s) {
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if (!s)
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return [];
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var opcodes = [];
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for (var i = 0; i < s.length;) {
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var b = s[i++];
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// Next `b` bytes should be pushed to stack
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if (b >= 0x01 && b <= 0x75) {
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opcodes.push(s.slice(i, i + b));
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i += b;
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continue;
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}
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var opcode = constants.opcodesByVal[b];
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if (opcode === 'pushdata1') {
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var len = s[i++];
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opcodes.push(s.slice(i, i + len));
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i += 2 + len;
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} else if (opcode === 'pushdata2') {
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var len = readU16(s, i);
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i += 2;
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opcodes.push(s.slice(i, i + len));
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i += len;
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} else if (opcode === 'pushdata4') {
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var len = readU32(s, i);
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i += 4;
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opcodes.push(s.slice(i, i + len));
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i += len;
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} else {
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opcodes.push(opcode || b);
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}
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}
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return opcodes;
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};
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script.encode = function encode(s) {
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if (!s)
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return [];
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var opcodes = constants.opcodes;
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var res = [];
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for (var i = 0; i < s.length; i++) {
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var instr = s[i];
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// Push value to stack
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if (Array.isArray(instr)) {
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if (1 <= instr.length && instr.length <= 0x75) {
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res = res.concat(instr.length, instr);
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} else if (instr.length <= 0xff) {
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res = res.concat(opcodes['pushdata1'], instr.length, instr);
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} else if (instr.length <= 0xffff) {
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res.push(opcodes['pushdata2']);
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utils.writeU16(res, instr.length, res.length);
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res = res.concat(instr);
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} else {
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res.push(opcodes['pushdata4']);
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utils.writeU32(res, instr.length, res.length);
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res = res.concat(instr);
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}
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continue;
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}
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res.push(opcodes[instr] || instr);
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}
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return res;
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};
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