readPushdata does not handle OP_0 (empty push)

[hans-crypto]

The halving block has some transactions that inscribe an ordinal and etch a rune.

Inscription 70279625

• https://ordpool.space/tx/1b37f19c0a50b7e90fba7b317a30b56ef8d3494684d7530eb6efec567ebdb32f
• https://ordinals.com/inscription/1b37f19c0a50b7e90fba7b317a30b56ef8d3494684d7530eb6efec567ebdb32fi0

Inscription 70279628

• https://ordpool.space/tx/7923e59abd8f8ab40dcc7915ae864d8b7ad6776811ba4d478f42248a7827a7f3
• https://ordinals.com/inscription/7923e59abd8f8ab40dcc7915ae864d8b7ad6776811ba4d478f42248a7827a7f3i0

The pushdata of these txns revealed a bug:

OP_PUSHBYTES_1 02
OP_0

Both inscriptions right now throw an exception, because the parser cant read the data for tag 2.
This is caused because my code for readPushdata does not handle OP_0 at all.

ordpool-parser/src/lib/reader.ts

Lines 26 to 63 in ce04d7a

	export function readPushdata(raw: Uint8Array, pointer: number): [Uint8Array, number] {
	let [opcodeSlice, newPointer] = readBytes(raw, pointer, 1);
	const opcode = opcodeSlice[0];
	// Handle the special case of OP_1NEGATE (-1)
	if (opcode === OP_1NEGATE) {
	// OP_1NEGATE pushes the value -1 onto the stack, represented as 0x81 in Bitcoin Script
	return [new Uint8Array([0x81]), newPointer];
	}
	// Handle minimal push numbers OP_PUSHNUM_1 (0x51) to OP_PUSHNUM_16 (0x60)
	// which are used to push the values 0x01 (decimal 1) through 0x10 (decimal 16) onto the stack.
	// To get the value, we can subtract OP_RESERVED (0x50) from the opcode to get the value to be pushed.
	if (opcode >= OP_PUSHNUM_1 && opcode <= OP_PUSHNUM_16) {
	// Convert opcode to corresponding byte value
	const byteValue = opcode - OP_RESERVED;
	return [Uint8Array.from([byteValue]), newPointer];
	}
	// Handle direct push of 1 to 75 bytes (OP_PUSHBYTES_1 to OP_PUSHBYTES_75)
	if (1 <= opcode && opcode <= 75) {
	return readBytes(raw, newPointer, opcode);
	}
	let numBytes: number;
	switch (opcode) {
	case OP_PUSHDATA1: numBytes = 1; break;
	case OP_PUSHDATA2: numBytes = 2; break;
	case OP_PUSHDATA4: numBytes = 4; break;
	default:
	throw new Error(`Invalid push opcode ${ opcode } at position ${pointer}`);
	}
	let [dataSizeArray, nextPointer] = readBytes(raw, newPointer, numBytes);
	let dataSize = littleEndianBytesToNumber(dataSizeArray);
	return readBytes(raw, nextPointer, dataSize);
	}