diff options
Diffstat (limited to 'vnfmarket/src/main/webapp/vnfmarket/node_modules/fd-slicer/index.js')
-rw-r--r-- | vnfmarket/src/main/webapp/vnfmarket/node_modules/fd-slicer/index.js | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/vnfmarket/src/main/webapp/vnfmarket/node_modules/fd-slicer/index.js b/vnfmarket/src/main/webapp/vnfmarket/node_modules/fd-slicer/index.js new file mode 100644 index 00000000..140e0038 --- /dev/null +++ b/vnfmarket/src/main/webapp/vnfmarket/node_modules/fd-slicer/index.js @@ -0,0 +1,277 @@ +var fs = require('fs'); +var util = require('util'); +var stream = require('stream'); +var Readable = stream.Readable; +var Writable = stream.Writable; +var PassThrough = stream.PassThrough; +var Pend = require('pend'); +var EventEmitter = require('events').EventEmitter; + +exports.createFromBuffer = createFromBuffer; +exports.createFromFd = createFromFd; +exports.BufferSlicer = BufferSlicer; +exports.FdSlicer = FdSlicer; + +util.inherits(FdSlicer, EventEmitter); +function FdSlicer(fd, options) { + options = options || {}; + EventEmitter.call(this); + + this.fd = fd; + this.pend = new Pend(); + this.pend.max = 1; + this.refCount = 0; + this.autoClose = !!options.autoClose; +} + +FdSlicer.prototype.read = function(buffer, offset, length, position, callback) { + var self = this; + self.pend.go(function(cb) { + fs.read(self.fd, buffer, offset, length, position, function(err, bytesRead, buffer) { + cb(); + callback(err, bytesRead, buffer); + }); + }); +}; + +FdSlicer.prototype.write = function(buffer, offset, length, position, callback) { + var self = this; + self.pend.go(function(cb) { + fs.write(self.fd, buffer, offset, length, position, function(err, written, buffer) { + cb(); + callback(err, written, buffer); + }); + }); +}; + +FdSlicer.prototype.createReadStream = function(options) { + return new ReadStream(this, options); +}; + +FdSlicer.prototype.createWriteStream = function(options) { + return new WriteStream(this, options); +}; + +FdSlicer.prototype.ref = function() { + this.refCount += 1; +}; + +FdSlicer.prototype.unref = function() { + var self = this; + self.refCount -= 1; + + if (self.refCount > 0) return; + if (self.refCount < 0) throw new Error("invalid unref"); + + if (self.autoClose) { + fs.close(self.fd, onCloseDone); + } + + function onCloseDone(err) { + if (err) { + self.emit('error', err); + } else { + self.emit('close'); + } + } +}; + +util.inherits(ReadStream, Readable); +function ReadStream(context, options) { + options = options || {}; + Readable.call(this, options); + + this.context = context; + this.context.ref(); + + this.start = options.start || 0; + this.endOffset = options.end; + this.pos = this.start; + this.destroyed = false; +} + +ReadStream.prototype._read = function(n) { + var self = this; + if (self.destroyed) return; + + var toRead = Math.min(self._readableState.highWaterMark, n); + if (self.endOffset != null) { + toRead = Math.min(toRead, self.endOffset - self.pos); + } + if (toRead <= 0) { + self.destroyed = true; + self.push(null); + self.context.unref(); + return; + } + self.context.pend.go(function(cb) { + if (self.destroyed) return cb(); + var buffer = new Buffer(toRead); + fs.read(self.context.fd, buffer, 0, toRead, self.pos, function(err, bytesRead) { + if (err) { + self.destroy(err); + } else if (bytesRead === 0) { + self.destroyed = true; + self.push(null); + self.context.unref(); + } else { + self.pos += bytesRead; + self.push(buffer.slice(0, bytesRead)); + } + cb(); + }); + }); +}; + +ReadStream.prototype.destroy = function(err) { + if (this.destroyed) return; + err = err || new Error("stream destroyed"); + this.destroyed = true; + this.emit('error', err); + this.context.unref(); +}; + +util.inherits(WriteStream, Writable); +function WriteStream(context, options) { + options = options || {}; + Writable.call(this, options); + + this.context = context; + this.context.ref(); + + this.start = options.start || 0; + this.endOffset = (options.end == null) ? Infinity : +options.end; + this.bytesWritten = 0; + this.pos = this.start; + this.destroyed = false; + + this.on('finish', this.destroy.bind(this)); +} + +WriteStream.prototype._write = function(buffer, encoding, callback) { + var self = this; + if (self.destroyed) return; + + if (self.pos + buffer.length > self.endOffset) { + var err = new Error("maximum file length exceeded"); + err.code = 'ETOOBIG'; + self.destroy(); + callback(err); + return; + } + self.context.pend.go(function(cb) { + if (self.destroyed) return cb(); + fs.write(self.context.fd, buffer, 0, buffer.length, self.pos, function(err, bytes) { + if (err) { + self.destroy(); + cb(); + callback(err); + } else { + self.bytesWritten += bytes; + self.pos += bytes; + self.emit('progress'); + cb(); + callback(); + } + }); + }); +}; + +WriteStream.prototype.destroy = function() { + if (this.destroyed) return; + this.destroyed = true; + this.context.unref(); +}; + +util.inherits(BufferSlicer, EventEmitter); +function BufferSlicer(buffer) { + EventEmitter.call(this); + + this.refCount = 0; + this.buffer = buffer; +} + +BufferSlicer.prototype.read = function(buffer, offset, length, position, callback) { + var end = position + length; + var delta = end - this.buffer.length; + var written = (delta > 0) ? delta : length; + this.buffer.copy(buffer, offset, position, end); + setImmediate(function() { + callback(null, written); + }); +}; + +BufferSlicer.prototype.write = function(buffer, offset, length, position, callback) { + buffer.copy(this.buffer, position, offset, offset + length); + setImmediate(function() { + callback(null, length, buffer); + }); +}; + +BufferSlicer.prototype.createReadStream = function(options) { + options = options || {}; + var readStream = new PassThrough(options); + readStream.start = options.start || 0; + readStream.endOffset = options.end; + readStream.pos = readStream.endOffset || this.buffer.length; // yep, we're already done + readStream.destroyed = false; + readStream.write(this.buffer.slice(readStream.start, readStream.pos)); + readStream.end(); + readStream.destroy = function() { + readStream.destroyed = true; + }; + return readStream; +}; + +BufferSlicer.prototype.createWriteStream = function(options) { + var bufferSlicer = this; + options = options || {}; + var writeStream = new Writable(options); + writeStream.start = options.start || 0; + writeStream.endOffset = (options.end == null) ? this.buffer.length : +options.end; + writeStream.bytesWritten = 0; + writeStream.pos = writeStream.start; + writeStream.destroyed = false; + writeStream._write = function(buffer, encoding, callback) { + if (writeStream.destroyed) return; + + var end = writeStream.pos + buffer.length; + if (end > writeStream.endOffset) { + var err = new Error("maximum file length exceeded"); + err.code = 'ETOOBIG'; + writeStream.destroyed = true; + callback(err); + return; + } + buffer.copy(bufferSlicer.buffer, writeStream.pos, 0, buffer.length); + + writeStream.bytesWritten += buffer.length; + writeStream.pos = end; + writeStream.emit('progress'); + callback(); + }; + writeStream.destroy = function() { + writeStream.destroyed = true; + }; + return writeStream; +}; + +BufferSlicer.prototype.ref = function() { + this.refCount += 1; +}; + +BufferSlicer.prototype.unref = function() { + this.refCount -= 1; + + if (this.refCount < 0) { + throw new Error("invalid unref"); + } +}; + +function createFromBuffer(buffer) { + return new BufferSlicer(buffer); +} + +function createFromFd(fd, options) { + return new FdSlicer(fd, options); +} |