--- /dev/null
+
+// == Extend Node primitives to use iconv-lite =================================
+
+module.exports = function (iconv) {
+ var original = undefined; // Place to keep original methods.
+
+ iconv.extendNodeEncodings = function extendNodeEncodings() {
+ if (original) return;
+ original = {};
+
+ 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 nodeNativeEncodings[enc && 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();
+ start = +start || 0;
+ if (typeof end !== 'number') end = this.length;
+
+ // Fastpath empty strings
+ if (+end == start)
+ return '';
+
+ // 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) {
+ // Try to use original function when possible.
+ if (Buffer.isNativeEncoding(enc))
+ return original.ReadableSetEncoding.call(this, enc);
+
+ // Try to use our own decoder, it has the same interface.
+ this._readableState.decoder = iconv.getCodec(enc).decoder(options);
+ this._readableState.encoding = enc;
+ }
+
+ Readable.prototype.collect = iconv._collect;
+ }
+ }
+
+ // Remove iconv-lite Node primitive extensions.
+ iconv.undoExtendNodeEncodings = function undoExtendNodeEncodings() {
+ 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;
+ }
+}
Code Review / sdnc / oam.git / blobdiff