owltech
Version:
This a backend for OwlTech Company
66 lines (61 loc) • 2.06 kB
JavaScript
// encodings/impl/binary
/**
* Encodes a binary JavaScript string to bytes.
* @param {string} src Source string
* @param {number} srcOffset Source offset
* @param {!ByteBuffer} dst Destination ByteBuffer
* @param {number} dstOffset Destination offset
* @param {number} count Number of char codes to encode
* @returns {number} Number of bytes encoded
* @inner
*/
function binary_encode(src, srcOffset, dst, dstOffset, count) {
var n = 0;
while (count--) {
var cc = src.charCodeAt(srcOffset++);
if (cc > 255)
throw Error("illegal binary char code: "+cc);
//? SET('cc', 'dstOffset++', 'dst');
++n;
}
return n;
}
/**
* Decodes bytes to a binary JavaScript string.
* @param {!ByteBuffer} src Source ByteBuffer
* @param {number} srcOffset Source offset
* @param {number} count Number of bytes to decode
* @returns {string} Decoded string
* @inner
*/
function binary_decode(src, srcOffset, count) {
if (count === 0)
return "";
var parts = [], // readily assembled parts
batch = []; // char codes for batch processing
while (count--) {
batch.push(/*? GET('srcOffset++', 'src') */);
if (batch.length > 1023) {
parts.push(String.fromCharCode.apply(String, batch));
batch.length = 0;
}
}
if (batch.length > 0) {
if (parts.length === 0)
return String.fromCharCode.apply(String, batch);
parts.push(String.fromCharCode.apply(String, batch));
}
return parts.join('');
}
/**
* Calculates the number of bytes required to store a binary JavaScript string.
* @param {string} src Source string
* @param {number} srcOffset Source offset
* @param {number} count Number of char codes to calculate
* @returns {number} Number of bytes required
* @inner
*/
function binary_calculate(src, srcOffset, count) {
return count;
}
ByteBuffer.registerEncoding("binary", binary_encode, binary_decode, binary_calculate);