diff options
Diffstat (limited to 'node_modules/block-stream/block-stream.js')
| -rw-r--r-- | node_modules/block-stream/block-stream.js | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/node_modules/block-stream/block-stream.js b/node_modules/block-stream/block-stream.js deleted file mode 100644 index 008de03..0000000 --- a/node_modules/block-stream/block-stream.js +++ /dev/null @@ -1,209 +0,0 @@ -// write data to it, and it'll emit data in 512 byte blocks. -// if you .end() or .flush(), it'll emit whatever it's got, -// padded with nulls to 512 bytes. - -module.exports = BlockStream - -var Stream = require("stream").Stream - , inherits = require("inherits") - , assert = require("assert").ok - , debug = process.env.DEBUG ? console.error : function () {} - -function BlockStream (size, opt) { - this.writable = this.readable = true - this._opt = opt || {} - this._chunkSize = size || 512 - this._offset = 0 - this._buffer = [] - this._bufferLength = 0 - if (this._opt.nopad) this._zeroes = false - else { - this._zeroes = new Buffer(this._chunkSize) - for (var i = 0; i < this._chunkSize; i ++) { - this._zeroes[i] = 0 - } - } -} - -inherits(BlockStream, Stream) - -BlockStream.prototype.write = function (c) { - // debug(" BS write", c) - if (this._ended) throw new Error("BlockStream: write after end") - if (c && !Buffer.isBuffer(c)) c = new Buffer(c + "") - if (c.length) { - this._buffer.push(c) - this._bufferLength += c.length - } - // debug("pushed onto buffer", this._bufferLength) - if (this._bufferLength >= this._chunkSize) { - if (this._paused) { - // debug(" BS paused, return false, need drain") - this._needDrain = true - return false - } - this._emitChunk() - } - return true -} - -BlockStream.prototype.pause = function () { - // debug(" BS pausing") - this._paused = true -} - -BlockStream.prototype.resume = function () { - // debug(" BS resume") - this._paused = false - return this._emitChunk() -} - -BlockStream.prototype.end = function (chunk) { - // debug("end", chunk) - if (typeof chunk === "function") cb = chunk, chunk = null - if (chunk) this.write(chunk) - this._ended = true - this.flush() -} - -BlockStream.prototype.flush = function () { - this._emitChunk(true) -} - -BlockStream.prototype._emitChunk = function (flush) { - // debug("emitChunk flush=%j emitting=%j paused=%j", flush, this._emitting, this._paused) - - // emit a <chunkSize> chunk - if (flush && this._zeroes) { - // debug(" BS push zeroes", this._bufferLength) - // push a chunk of zeroes - var padBytes = (this._bufferLength % this._chunkSize) - if (padBytes !== 0) padBytes = this._chunkSize - padBytes - if (padBytes > 0) { - // debug("padBytes", padBytes, this._zeroes.slice(0, padBytes)) - this._buffer.push(this._zeroes.slice(0, padBytes)) - this._bufferLength += padBytes - // debug(this._buffer[this._buffer.length - 1].length, this._bufferLength) - } - } - - if (this._emitting || this._paused) return - this._emitting = true - - // debug(" BS entering loops") - var bufferIndex = 0 - while (this._bufferLength >= this._chunkSize && - (flush || !this._paused)) { - // debug(" BS data emission loop", this._bufferLength) - - var out - , outOffset = 0 - , outHas = this._chunkSize - - while (outHas > 0 && (flush || !this._paused) ) { - // debug(" BS data inner emit loop", this._bufferLength) - var cur = this._buffer[bufferIndex] - , curHas = cur.length - this._offset - // debug("cur=", cur) - // debug("curHas=%j", curHas) - // If it's not big enough to fill the whole thing, then we'll need - // to copy multiple buffers into one. However, if it is big enough, - // then just slice out the part we want, to save unnecessary copying. - // Also, need to copy if we've already done some copying, since buffers - // can't be joined like cons strings. - if (out || curHas < outHas) { - out = out || new Buffer(this._chunkSize) - cur.copy(out, outOffset, - this._offset, this._offset + Math.min(curHas, outHas)) - } else if (cur.length === outHas && this._offset === 0) { - // shortcut -- cur is exactly long enough, and no offset. - out = cur - } else { - // slice out the piece of cur that we need. - out = cur.slice(this._offset, this._offset + outHas) - } - - if (curHas > outHas) { - // means that the current buffer couldn't be completely output - // update this._offset to reflect how much WAS written - this._offset += outHas - outHas = 0 - } else { - // output the entire current chunk. - // toss it away - outHas -= curHas - outOffset += curHas - bufferIndex ++ - this._offset = 0 - } - } - - this._bufferLength -= this._chunkSize - assert(out.length === this._chunkSize) - // debug("emitting data", out) - // debug(" BS emitting, paused=%j", this._paused, this._bufferLength) - this.emit("data", out) - out = null - } - // debug(" BS out of loops", this._bufferLength) - - // whatever is left, it's not enough to fill up a block, or we're paused - this._buffer = this._buffer.slice(bufferIndex) - if (this._paused) { - // debug(" BS paused, leaving", this._bufferLength) - this._needsDrain = true - this._emitting = false - return - } - - // if flushing, and not using null-padding, then need to emit the last - // chunk(s) sitting in the queue. We know that it's not enough to - // fill up a whole block, because otherwise it would have been emitted - // above, but there may be some offset. - var l = this._buffer.length - if (flush && !this._zeroes && l) { - if (l === 1) { - if (this._offset) { - this.emit("data", this._buffer[0].slice(this._offset)) - } else { - this.emit("data", this._buffer[0]) - } - } else { - var outHas = this._bufferLength - , out = new Buffer(outHas) - , outOffset = 0 - for (var i = 0; i < l; i ++) { - var cur = this._buffer[i] - , curHas = cur.length - this._offset - cur.copy(out, outOffset, this._offset) - this._offset = 0 - outOffset += curHas - this._bufferLength -= curHas - } - this.emit("data", out) - } - // truncate - this._buffer.length = 0 - this._bufferLength = 0 - this._offset = 0 - } - - // now either drained or ended - // debug("either draining, or ended", this._bufferLength, this._ended) - // means that we've flushed out all that we can so far. - if (this._needDrain) { - // debug("emitting drain", this._bufferLength) - this._needDrain = false - this.emit("drain") - } - - if ((this._bufferLength === 0) && this._ended && !this._endEmitted) { - // debug("emitting end", this._bufferLength) - this._endEmitted = true - this.emit("end") - } - - this._emitting = false - - // debug(" BS no longer emitting", flush, this._paused, this._emitting, this._bufferLength, this._chunkSize) -} |