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