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extend-node.js 8.50 KiB
"use strict";
var Buffer = require("buffer").Buffer;
// Note: not polyfilled with safer-buffer on a purpose, as overrides Buffer
// == Extend Node primitives to use iconv-lite =================================
module.exports = function (iconv) {
    var original = undefined; // Place to keep original methods.
    // Node authors rewrote Buffer internals to make it compatible with
    // Uint8Array and we cannot patch key functions since then.
    // Note: this does use older Buffer API on a purpose
    iconv.supportsNodeEncodingsExtension = !(Buffer.from || new Buffer(0) instanceof Uint8Array);
    iconv.extendNodeEncodings = function extendNodeEncodings() {
        if (original) return;
        original = {};
        if (!iconv.supportsNodeEncodingsExtension) {
            console.error("ACTION NEEDED: require('iconv-lite').extendNodeEncodings() is not supported in your version of Node");
            console.error("See more info at https://github.com/ashtuchkin/iconv-lite/wiki/Node-v4-compatibility");
            return;
        var nodeNativeEncodings = {
            'hex': true, 'utf8': true, 'utf-8': true, 'ascii': true, 'binary': true, 
            'base64': true, 'ucs2': true, 'ucs-2': true, 'utf16le': true, 'utf-16le': true,
        Buffer.isNativeEncoding = function(enc) {
            return enc && nodeNativeEncodings[enc.toLowerCase()];
        // -- SlowBuffer -----------------------------------------------------------
        var SlowBuffer = require('buffer').SlowBuffer;
        original.SlowBufferToString = SlowBuffer.prototype.toString;
        SlowBuffer.prototype.toString = function(encoding, start, end) {
            encoding = String(encoding || 'utf8').toLowerCase();
            // Use native conversion when possible
            if (Buffer.isNativeEncoding(encoding))
                return original.SlowBufferToString.call(this, encoding, start, end);
            // Otherwise, use our decoding method.
            if (typeof start == 'undefined') start = 0;
            if (typeof end == 'undefined') end = this.length;
            return iconv.decode(this.slice(start, end), encoding);
        original.SlowBufferWrite = SlowBuffer.prototype.write;
        SlowBuffer.prototype.write = function(string, offset, length, encoding) {
            // Support both (string, offset, length, encoding)
            // and the legacy (string, encoding, offset, length)
            if (isFinite(offset)) {
                if (!isFinite(length)) {
                    encoding = length;
                    length = undefined;
            } else {  // legacy
                var swap = encoding;
                encoding = offset;
                offset = length;
                length = swap;
            offset = +offset || 0;
            var remaining = this.length - offset;
            if (!length) {
                length = remaining;
} else { length = +length; if (length > remaining) { length = remaining; } } encoding = String(encoding || 'utf8').toLowerCase(); // Use native conversion when possible if (Buffer.isNativeEncoding(encoding)) return original.SlowBufferWrite.call(this, string, offset, length, encoding); if (string.length > 0 && (length < 0 || offset < 0)) throw new RangeError('attempt to write beyond buffer bounds'); // Otherwise, use our encoding method. var buf = iconv.encode(string, encoding); if (buf.length < length) length = buf.length; buf.copy(this, offset, 0, length); return length; } // -- Buffer --------------------------------------------------------------- original.BufferIsEncoding = Buffer.isEncoding; Buffer.isEncoding = function(encoding) { return Buffer.isNativeEncoding(encoding) || iconv.encodingExists(encoding); } original.BufferByteLength = Buffer.byteLength; Buffer.byteLength = SlowBuffer.byteLength = function(str, encoding) { encoding = String(encoding || 'utf8').toLowerCase(); // Use native conversion when possible if (Buffer.isNativeEncoding(encoding)) return original.BufferByteLength.call(this, str, encoding); // Slow, I know, but we don't have a better way yet. return iconv.encode(str, encoding).length; } original.BufferToString = Buffer.prototype.toString; Buffer.prototype.toString = function(encoding, start, end) { encoding = String(encoding || 'utf8').toLowerCase(); // Use native conversion when possible if (Buffer.isNativeEncoding(encoding)) return original.BufferToString.call(this, encoding, start, end); // Otherwise, use our decoding method. if (typeof start == 'undefined') start = 0; if (typeof end == 'undefined') end = this.length; return iconv.decode(this.slice(start, end), encoding); } original.BufferWrite = Buffer.prototype.write; Buffer.prototype.write = function(string, offset, length, encoding) { var _offset = offset, _length = length, _encoding = encoding; // Support both (string, offset, length, encoding) // and the legacy (string, encoding, offset, length) if (isFinite(offset)) { if (!isFinite(length)) { encoding = length; length = undefined; } } else { // legacy var swap = encoding; encoding = offset; offset = length; length = swap;
} encoding = String(encoding || 'utf8').toLowerCase(); // Use native conversion when possible if (Buffer.isNativeEncoding(encoding)) return original.BufferWrite.call(this, string, _offset, _length, _encoding); offset = +offset || 0; var remaining = this.length - offset; if (!length) { length = remaining; } else { length = +length; if (length > remaining) { length = remaining; } } if (string.length > 0 && (length < 0 || offset < 0)) throw new RangeError('attempt to write beyond buffer bounds'); // Otherwise, use our encoding method. var buf = iconv.encode(string, encoding); if (buf.length < length) length = buf.length; buf.copy(this, offset, 0, length); return length; // TODO: Set _charsWritten. } // -- Readable ------------------------------------------------------------- if (iconv.supportsStreams) { var Readable = require('stream').Readable; original.ReadableSetEncoding = Readable.prototype.setEncoding; Readable.prototype.setEncoding = function setEncoding(enc, options) { // Use our own decoder, it has the same interface. // We cannot use original function as it doesn't handle BOM-s. this._readableState.decoder = iconv.getDecoder(enc, options); this._readableState.encoding = enc; } Readable.prototype.collect = iconv._collect; } } // Remove iconv-lite Node primitive extensions. iconv.undoExtendNodeEncodings = function undoExtendNodeEncodings() { if (!iconv.supportsNodeEncodingsExtension) return; if (!original) throw new Error("require('iconv-lite').undoExtendNodeEncodings(): Nothing to undo; extendNodeEncodings() is not called.") delete Buffer.isNativeEncoding; var SlowBuffer = require('buffer').SlowBuffer; SlowBuffer.prototype.toString = original.SlowBufferToString; SlowBuffer.prototype.write = original.SlowBufferWrite; Buffer.isEncoding = original.BufferIsEncoding; Buffer.byteLength = original.BufferByteLength; Buffer.prototype.toString = original.BufferToString; Buffer.prototype.write = original.BufferWrite; if (iconv.supportsStreams) { var Readable = require('stream').Readable;
Readable.prototype.setEncoding = original.ReadableSetEncoding; delete Readable.prototype.collect; } original = undefined; } }