script encoding.
This commit is contained in:
Christopher Jeffrey
parent
94b20355ea
commit
4b1e055a05
@ -2466,25 +2466,16 @@ Script.sign = function sign(msg, key, type) {
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Script.decode = function decode(buf) {
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var code = [];
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var i = 0;
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var off = 0;
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var b, opcode, len;
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if (!buf)
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return [];
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while (i < buf.length) {
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b = buf[i++];
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// Next `b` bytes should be pushed to stack
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if (b >= 0x01 && b <= 0x4b) {
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code.push(utils.slice(buf, i, i + b));
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i += b;
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utils.hidden(code[code.length - 1], 'pushdata', {
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opcode: null,
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len: b
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});
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continue;
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}
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// NOTE: We can't use a BufferReader here since
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// script parsing was originally non-strict.
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while (off < buf.length) {
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b = buf[off++];
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// OP_0, OP_FALSE
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// Special case: this is an empty array
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@ -2494,6 +2485,17 @@ Script.decode = function decode(buf) {
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continue;
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}
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// Next `b` bytes should be pushed to stack
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if (b >= 0x01 && b <= 0x4b) {
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code.push(utils.slice(buf, off, off + b));
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off += b;
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utils.hidden(code[code.length - 1], 'pushdata', {
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opcode: null,
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len: b
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});
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continue;
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}
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// OP_1, OP_TRUE, OP_2-OP_16
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// Special case: these get to be number
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// literals. Note: 1negate is not included.
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@ -2504,34 +2506,34 @@ Script.decode = function decode(buf) {
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opcode = constants.opcodesByVal[b];
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if (i >= buf.length) {
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if (off >= buf.length) {
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code.push(opcode || b);
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continue;
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}
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if (opcode === 'pushdata1') {
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len = buf[i];
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i += 1;
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code.push(utils.slice(buf, i, i + len));
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i += len;
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len = buf[off];
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off += 1;
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code.push(utils.slice(buf, off, off + len));
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off += len;
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utils.hidden(code[code.length - 1], 'pushdata', {
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opcode: opcode,
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len: len
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});
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} else if (opcode === 'pushdata2') {
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len = utils.readU16(buf, i);
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i += 2;
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code.push(utils.slice(buf, i, i + len));
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i += len;
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len = utils.readU16(buf, off);
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off += 2;
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code.push(utils.slice(buf, off, off + len));
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off += len;
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utils.hidden(code[code.length - 1], 'pushdata', {
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opcode: opcode,
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len: len
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});
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} else if (opcode === 'pushdata4') {
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len = utils.readU32(buf, i);
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i += 4;
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code.push(utils.slice(buf, i, i + len));
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i += len;
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len = utils.readU32(buf, off);
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off += 4;
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code.push(utils.slice(buf, off, off + len));
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off += len;
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utils.hidden(code[code.length - 1], 'pushdata', {
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opcode: opcode,
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len: len
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@ -2545,111 +2547,65 @@ Script.decode = function decode(buf) {
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};
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Script.encode = function encode(code) {
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var p = new bcoin.protocol.framer.BufferWriter();
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var opcodes = constants.opcodes;
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var i = 0;
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var instr;
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var total = 0;
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var off = 0;
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var buf;
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if (!code)
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return new Buffer([]);
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if (code._raw)
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return code._raw;
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var op;
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for (i = 0; i < code.length; i++) {
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instr = code[i];
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if (Buffer.isBuffer(instr)) {
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if (instr.pushdata) {
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if (instr.pushdata.opcode === null) {
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total += 1 + instr.length;
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} else if (instr.pushdata.opcode === 'pushdata1') {
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total += 1 + 1 + instr.length;
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} else if (instr.pushdata.opcode === 'pushdata2') {
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total += 1 + 2 + instr.length;
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} else if (instr.pushdata.opcode === 'pushdata4') {
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total += 1 + 4 + instr.length;
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}
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continue;
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}
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if (instr.length === 0) {
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total += 1;
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} else if (1 <= instr.length && instr.length <= 0x4b) {
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total += 1 + instr.length;
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} else if (instr.length <= 0xff) {
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total += 1 + 1 + instr.length;
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} else if (instr.length <= 0xffff) {
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total += 1 + 2 + instr.length;
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} else {
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total += 1 + 4 + instr.length;
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}
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continue;
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}
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total += 1;
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}
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buf = new Buffer(total);
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for (i = 0; i < code.length; i++) {
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instr = code[i];
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assert(!Array.isArray(instr));
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op = code[i];
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// Push value to stack
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if (Buffer.isBuffer(instr)) {
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if (Buffer.isBuffer(op)) {
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// Check for nonstandard pushdatas that
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// may have been decoded from before.
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if (instr.pushdata) {
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if (instr.pushdata.opcode === null) {
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buf[off++] = instr.pushdata.len;
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off += instr.copy(buf, off, 0, instr.length);
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} else if (instr.pushdata.opcode === 'pushdata1') {
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buf[off++] = opcodes.pushdata1;
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buf[off++] = instr.pushdata.len;
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off += instr.copy(buf, off, 0, instr.length);
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} else if (instr.pushdata.opcode === 'pushdata2') {
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buf[off++] = opcodes.pushdata2;
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off += utils.writeU16(buf, instr.pushdata.len, off);
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off += instr.copy(buf, off, 0, instr.length);
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} else if (instr.pushdata.opcode === 'pushdata4') {
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buf[off++] = opcodes.pushdata4;
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off += utils.writeU32(buf, instr.pushdata.len, off);
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off += instr.copy(buf, off, 0, instr.length);
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if (op.pushdata) {
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if (op.pushdata.opcode === null) {
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p.writeU8(op.pushdata.len);
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p.writeBytes(op);
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} else if (op.pushdata.opcode === 'pushdata1') {
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p.writeU8(opcodes.pushdata1);
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p.writeU8(op.pushdata.len);
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p.writeBytes(op);
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} else if (op.pushdata.opcode === 'pushdata2') {
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p.writeU8(opcodes.pushdata2);
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p.writeU16(op.pushdata.len);
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p.writeBytes(op);
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} else if (op.pushdata.opcode === 'pushdata4') {
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p.writeU8(opcodes.pushdata4);
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p.writeU32(op.pushdata.len);
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p.writeBytes(op);
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}
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continue;
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}
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if (instr.length === 0) {
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buf[off++] = opcodes['0'];
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} else if (1 <= instr.length && instr.length <= 0x4b) {
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buf[off++] = instr.length;
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off += instr.copy(buf, off, 0, instr.length);
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} else if (instr.length <= 0xff) {
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buf[off++] = opcodes.pushdata1;
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buf[off++] = instr.length;
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off += instr.copy(buf, off, 0, instr.length);
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} else if (instr.length <= 0xffff) {
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buf[off++] = opcodes.pushdata2;
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off += utils.writeU16(buf, instr.length, off);
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off += instr.copy(buf, off, 0, instr.length);
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// Standard minimaldata encoding
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if (op.length === 0) {
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p.writeU8(opcodes['0']);
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} else if (op.length <= 0x4b) {
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p.writeU8(op.length);
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p.writeBytes(op);
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} else if (op.length <= 0xff) {
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p.writeU8(opcodes.pushdata1);
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p.writeU8(op.length);
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p.writeBytes(op);
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} else if (op.length <= 0xffff) {
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p.writeU8(opcodes.pushdata2);
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p.writeU16(op.length);
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p.writeBytes(op);
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} else {
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buf[off++] = opcodes.pushdata4;
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off += utils.writeU32(buf, instr.length, off);
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off += instr.copy(buf, off, 0, instr.length);
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p.writeU8(opcodes.pushdata4);
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p.writeU32(op.length);
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p.writeBytes(op);
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}
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continue;
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}
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assert(opcodes[instr] != null || typeof instr === 'number');
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assert(opcodes[op] != null || typeof op === 'number');
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buf[off++] = opcodes[instr] || instr;
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p.writeU8(opcodes[op] || op);
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}
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assert(off === buf.length);
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return buf;
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return p.render();
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};
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Script.witness = Witness;
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