Web3EncodeRLPHeader.js

/*
Author: Chance Santana-Wees
Contact Email: figs999@gmail.com
*/

var encodeRLPHeader = function(block) {
	var output = 
		encode_with_length(block.parentHash.slice(2),128) +
		encode_with_length(block.sha3Uncles.slice(2),128) +
		encode_with_length(block.miner.slice(2),128) +
		encode_with_length(block.stateRoot.slice(2),128) +
		encode_with_length(block.transactionsRoot.slice(2),128) +
		encode_with_length(block.receiptsRoot.slice(2),128) +
		encode_with_length(block.logsBloom.slice(2),128) + 
		encode_with_length(block.difficulty.toString(16),128) +
		encode_with_length(block.number.toString(16),128) + 
		encode_with_length(block.gasLimit.toString(16),128) + 
		encode_with_length(block.gasUsed.toString(16),128) + 
		encode_with_length(block.timestamp.toString(16),128) + 
		encode_with_length(block.extraData.slice(2),128) +
		encode_with_length(block.mixHash.slice(2),128) + 
		encode_with_length(block.nonce.slice(2),128);
	return encode_length(output, 192) + output;
}

var encode_length = function(input, offset) {
	L = input.length/2;
	if(L < 56) {
		return (L + offset).toString(16);
	} else {
		return encode_with_length(L.toString(16),55+offset);
	}
}

var encode_with_length = function(input, offset) {
	if(input.length % 2 != 0)
		input = "0" + input;
	return encode_length(input, offset) + input;
}

function hexToBytes(hex) {
	for (var bytes = [], c = 0; c < hex.length; c += 2)
	bytes.push(parseInt(hex.substr(c, 2), 16));
	return bytes;
}