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@@ -0,0 +1,753 @@
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+"use strict";
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+
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+(function()
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+{
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+ v86util.SyncBuffer = SyncBuffer;
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+ v86util.AsyncXHRBuffer = AsyncXHRBuffer;
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+ v86util.AsyncXHRPartfileBuffer = AsyncXHRPartfileBuffer;
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+ v86util.AsyncFileBuffer = AsyncFileBuffer;
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+ v86util.SyncFileBuffer = SyncFileBuffer;
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+
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+ // The smallest size the emulated hardware can emit
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+ const BLOCK_SIZE = 256;
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+
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+ const ASYNC_SAFE = false;
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+
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+ /**
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+ * Synchronous access to ArrayBuffer
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+ * @constructor
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+ */
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+ function SyncBuffer(buffer)
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+ {
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+ dbg_assert(buffer instanceof ArrayBuffer);
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+
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+ this.buffer = buffer;
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+ this.byteLength = buffer.byteLength;
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+ this.onload = undefined;
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+ this.onprogress = undefined;
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+ }
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+
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+ SyncBuffer.prototype.load = function()
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+ {
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+ this.onload && this.onload({ buffer: this.buffer });
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+ };
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+
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+ /**
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+ * @param {number} start
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+ * @param {number} len
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+ * @param {function(!Uint8Array)} fn
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+ */
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+ SyncBuffer.prototype.get = function(start, len, fn)
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+ {
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+ dbg_assert(start + len <= this.byteLength);
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+ fn(new Uint8Array(this.buffer, start, len));
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+ };
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+
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+ /**
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+ * @param {number} start
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+ * @param {!Uint8Array} slice
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+ * @param {function()} fn
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+ */
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+ SyncBuffer.prototype.set = function(start, slice, fn)
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+ {
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+ dbg_assert(start + slice.byteLength <= this.byteLength);
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+
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+ new Uint8Array(this.buffer, start, slice.byteLength).set(slice);
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+ fn();
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+ };
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+
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+ /**
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+ * @param {function(!ArrayBuffer)} fn
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+ */
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+ SyncBuffer.prototype.get_buffer = function(fn)
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+ {
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+ fn(this.buffer);
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+ };
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+
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+ SyncBuffer.prototype.get_state = function()
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+ {
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+ const state = [];
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+ state[0] = this.byteLength;
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+ state[1] = new Uint8Array(this.buffer);
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+ return state;
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+ };
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+
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+ SyncBuffer.prototype.set_state = function(state)
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+ {
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+ this.byteLength = state[0];
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+ this.buffer = state[1].slice().buffer;
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+ };
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+
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+ /**
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+ * Asynchronous access to ArrayBuffer, loading blocks lazily as needed,
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+ * using the `Range: bytes=...` header
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+ *
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+ * @constructor
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+ * @param {string} filename Name of the file to download
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+ * @param {number|undefined} size
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+ */
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+ function AsyncXHRBuffer(filename, size)
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+ {
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+ this.filename = filename;
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+
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+ this.byteLength = size;
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+
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+ this.block_cache = new Map();
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+ this.block_cache_is_write = new Set();
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+
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+ this.onload = undefined;
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+ this.onprogress = undefined;
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+ }
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+
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+ AsyncXHRBuffer.prototype.load = function()
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+ {
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+ if(this.byteLength !== undefined)
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+ {
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+ this.onload && this.onload(Object.create(null));
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+ return;
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+ }
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+
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+ // Determine the size using a request
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+
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+ determine_size(this.filename, (error, size) =>
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+ {
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+ if(error)
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+ {
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+ throw new Error("Cannot use: " + this.filename + ". " + error);
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+ }
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+ else
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+ {
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+ dbg_assert(size >= 0);
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+ this.byteLength = size;
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+ this.onload && this.onload(Object.create(null));
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+ }
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+ });
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+ };
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+
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+ /**
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+ * @param {number} offset
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+ * @param {number} len
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+ * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
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+ */
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+ AsyncXHRBuffer.prototype.get_from_cache = function(offset, len)
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+ {
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+ var number_of_blocks = len / BLOCK_SIZE;
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+ var block_index = offset / BLOCK_SIZE;
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+
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+ for(var i = 0; i < number_of_blocks; i++)
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+ {
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+ var block = this.block_cache.get(block_index + i);
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+
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+ if(!block)
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+ {
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+ return;
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+ }
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+ }
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+
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+ if(number_of_blocks === 1)
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+ {
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+ return this.block_cache.get(block_index);
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+ }
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+ else
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+ {
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+ var result = new Uint8Array(len);
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+ for(var i = 0; i < number_of_blocks; i++)
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+ {
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+ result.set(this.block_cache.get(block_index + i), i * BLOCK_SIZE);
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+ }
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+ return result;
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+ }
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+ };
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+
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+ /**
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+ * @param {number} offset
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+ * @param {number} len
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+ * @param {function(!Uint8Array)} fn
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+ */
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+ AsyncXHRBuffer.prototype.get = function(offset, len, fn)
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+ {
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+ dbg_assert(offset + len <= this.byteLength);
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+ dbg_assert(offset % BLOCK_SIZE === 0);
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+ dbg_assert(len % BLOCK_SIZE === 0);
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+ dbg_assert(len);
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+
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+ var block = this.get_from_cache(offset, len);
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+ if(block)
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+ {
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+ if(ASYNC_SAFE)
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+ {
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+ setTimeout(fn.bind(this, block), 0);
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+ }
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+ else
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+ {
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+ fn(block);
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+ }
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+ return;
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+ }
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+
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+ v86util.load_file(this.filename, {
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+ done: function done(buffer)
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+ {
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+ var block = new Uint8Array(buffer);
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+ this.handle_read(offset, len, block);
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+ fn(block);
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+ }.bind(this),
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+ range: { start: offset, length: len },
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+ });
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+ };
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+
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+ /**
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+ * Relies on this.byteLength and this.block_cache
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+ *
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+ * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
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+ *
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+ * @param {number} start
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+ * @param {!Uint8Array} data
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+ * @param {function()} fn
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+ */
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+ AsyncXHRBuffer.prototype.set = function(start, data, fn)
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+ {
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+ var len = data.length;
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+ dbg_assert(start + data.byteLength <= this.byteLength);
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+ dbg_assert(start % BLOCK_SIZE === 0);
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+ dbg_assert(len % BLOCK_SIZE === 0);
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+ dbg_assert(len);
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+
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+ var start_block = start / BLOCK_SIZE;
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+ var block_count = len / BLOCK_SIZE;
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+
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+ for(var i = 0; i < block_count; i++)
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+ {
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+ var block = this.block_cache.get(start_block + i);
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+
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+ if(block === undefined)
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+ {
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+ block = new Uint8Array(BLOCK_SIZE);
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+ this.block_cache.set(start_block + i, block);
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+ }
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+
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+ var data_slice = data.subarray(i * BLOCK_SIZE, (i + 1) * BLOCK_SIZE);
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+ block.set(data_slice);
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+
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+ dbg_assert(block.byteLength === data_slice.length);
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+
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+ this.block_cache_is_write.add(start_block + i);
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+ }
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+
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+ fn();
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+ };
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+
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+ /**
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+ * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
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+ * @param {number} offset
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+ * @param {number} len
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+ * @param {!Uint8Array} block
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+ */
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+ AsyncXHRBuffer.prototype.handle_read = function(offset, len, block)
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+ {
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+ // Used by AsyncXHRBuffer, AsyncXHRPartfileBuffer and AsyncFileBuffer
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+ // Overwrites blocks from the original source that have been written since
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+
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+ var start_block = offset / BLOCK_SIZE;
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+ var block_count = len / BLOCK_SIZE;
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+
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+ for(var i = 0; i < block_count; i++)
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+ {
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+ const cached_block = this.block_cache.get(start_block + i);
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+
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+ if(cached_block)
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+ {
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+ block.set(cached_block, i * BLOCK_SIZE);
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+ }
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+ else if(this.cache_reads)
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+ {
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+ const cached = new Uint8Array(BLOCK_SIZE);
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+ cached.set(block.subarray(i * BLOCK_SIZE, (i + 1) * BLOCK_SIZE));
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+ this.block_cache.set(start_block + i, cached);
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+ }
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+ }
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+ };
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+
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+ AsyncXHRBuffer.prototype.get_buffer = function(fn)
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+ {
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+ // We must download all parts, unlikely a good idea for big files
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+ fn();
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+ };
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+
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+ ///**
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+ // * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
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+ // */
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+ //AsyncXHRBuffer.prototype.get_block_cache = function()
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+ //{
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+ // var count = Object.keys(this.block_cache).length;
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+
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+ // var buffer = new Uint8Array(count * BLOCK_SIZE);
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+ // var indices = [];
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+
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+ // var i = 0;
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+ // for(var index of Object.keys(this.block_cache))
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+ // {
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+ // var block = this.block_cache.get(index);
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+ // dbg_assert(block.length === BLOCK_SIZE);
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+ // index = +index;
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+ // indices.push(index);
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+ // buffer.set(
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+ // block,
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+ // i * BLOCK_SIZE
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+ // );
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+ // i++;
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+ // }
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+
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+ // return {
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+ // buffer,
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+ // indices,
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+ // block_size: BLOCK_SIZE,
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+ // };
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+ //};
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+
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+ /**
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+ * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
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+ */
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+ AsyncXHRBuffer.prototype.get_state = function()
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+ {
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+ const state = [];
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+ const block_cache = [];
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+
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+ for(let [index, block] of this.block_cache)
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+ {
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+ dbg_assert(isFinite(index));
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+ if(this.block_cache_is_write.has(index))
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+ {
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+ block_cache.push([index, block]);
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+ }
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+ }
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+
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+ state[0] = block_cache;
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+ return state;
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+ };
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+
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+ /**
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+ * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
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+ */
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+ AsyncXHRBuffer.prototype.set_state = function(state)
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+ {
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+ const block_cache = state[0];
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+ this.block_cache.clear();
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+ this.block_cache_is_write.clear();
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+
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+ for(let [index, block] of block_cache)
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+ {
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+ dbg_assert(isFinite(index));
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+ this.block_cache.set(index, block);
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+ this.block_cache_is_write.add(index);
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+ }
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+ };
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+
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+ /**
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+ * Asynchronous access to ArrayBuffer, loading blocks lazily as needed,
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+ * downloading files named filename-%d-%d.ext (where the %d are start and end offset).
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+ * Or, if partfile_alt_format is set, filename-%08d.ext (where %d is the part number, compatible with gnu split).
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+ *
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+ * @constructor
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+ * @param {string} filename Name of the file to download
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+ * @param {number|undefined} size
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+ * @param {number|undefined} fixed_chunk_size
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+ * @param {boolean|undefined} partfile_alt_format
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+ */
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+ function AsyncXHRPartfileBuffer(filename, size, fixed_chunk_size, partfile_alt_format)
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+ {
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+ const parts = filename.match(/(.*)(\..*)/);
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+
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+ if(parts)
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+ {
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+ this.basename = parts[1];
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+ this.extension = parts[2];
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+ }
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+ else
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+ {
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+ this.basename = filename;
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+ this.extension = "";
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+ }
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+
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+ this.block_cache = new Map();
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+ this.block_cache_is_write = new Set();
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+
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+ this.byteLength = size;
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+ this.fixed_chunk_size = fixed_chunk_size;
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+ this.partfile_alt_format = !!partfile_alt_format;
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+
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+ this.cache_reads = !!fixed_chunk_size; // TODO: could also be useful in other cases (needs testing)
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+
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+ this.onload = undefined;
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+ this.onprogress = undefined;
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+ }
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+
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+ AsyncXHRPartfileBuffer.prototype.load = function()
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+ {
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+ if(this.byteLength !== undefined)
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+ {
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+ this.onload && this.onload(Object.create(null));
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+ return;
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+ }
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+ dbg_assert(false);
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+ this.onload && this.onload(Object.create(null));
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+ };
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+
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+ /**
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+ * @param {number} offset
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+ * @param {number} len
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+ * @param {function(!Uint8Array)} fn
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+ */
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+ AsyncXHRPartfileBuffer.prototype.get = function(offset, len, fn)
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+ {
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+ dbg_assert(offset + len <= this.byteLength);
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+ dbg_assert(offset % BLOCK_SIZE === 0);
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+ dbg_assert(len % BLOCK_SIZE === 0);
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+ dbg_assert(len);
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+
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+ const block = this.get_from_cache(offset, len);
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+
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+ if(block)
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+ {
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+ if(ASYNC_SAFE)
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+ {
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+ setTimeout(fn.bind(this, block), 0);
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+ }
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+ else
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+ {
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+ fn(block);
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+ }
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+ return;
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+ }
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+
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+ if(this.fixed_chunk_size)
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+ {
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+ const start_index = Math.floor(offset / this.fixed_chunk_size);
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+ const m_offset = offset - start_index * this.fixed_chunk_size;
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+ dbg_assert(m_offset >= 0);
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+ const total_count = Math.ceil((m_offset + len) / this.fixed_chunk_size);
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+ const blocks = new Uint8Array(total_count * this.fixed_chunk_size);
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+ let finished = 0;
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+
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+ for(let i = 0; i < total_count; i++)
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+ {
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+ const offset = (start_index + i) * this.fixed_chunk_size;
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+
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+ const part_filename =
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+ this.partfile_alt_format ?
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+ // matches output of gnu split:
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+ // split -b 512 -a8 -d --additional-suffix .img w95.img w95-
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+ this.basename + "-" + (start_index + i + "").padStart(8, "0") + this.extension
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+ :
|
|
|
+ this.basename + "-" + offset + "-" + (offset + this.fixed_chunk_size) + this.extension;
|
|
|
+
|
|
|
+ // XXX: unnecessary allocation
|
|
|
+ const block = this.get_from_cache(offset, this.fixed_chunk_size);
|
|
|
+
|
|
|
+ if(block)
|
|
|
+ {
|
|
|
+ const cur = i * this.fixed_chunk_size;
|
|
|
+ blocks.set(block, cur);
|
|
|
+ finished++;
|
|
|
+ if(finished === total_count)
|
|
|
+ {
|
|
|
+ const tmp_blocks = blocks.subarray(m_offset, m_offset + len);
|
|
|
+ fn(tmp_blocks);
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ v86util.load_file(part_filename, {
|
|
|
+ done: function done(buffer)
|
|
|
+ {
|
|
|
+ const cur = i * this.fixed_chunk_size;
|
|
|
+ const block = new Uint8Array(buffer);
|
|
|
+ this.handle_read((start_index + i) * this.fixed_chunk_size, this.fixed_chunk_size|0, block);
|
|
|
+ blocks.set(block, cur);
|
|
|
+ finished++;
|
|
|
+ if(finished === total_count)
|
|
|
+ {
|
|
|
+ const tmp_blocks = blocks.subarray(m_offset, m_offset + len);
|
|
|
+ fn(tmp_blocks);
|
|
|
+ }
|
|
|
+ }.bind(this),
|
|
|
+ });
|
|
|
+ }
|
|
|
+ }
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ const part_filename = this.basename + "-" + offset + "-" + (offset + len) + this.extension;
|
|
|
+
|
|
|
+ v86util.load_file(part_filename, {
|
|
|
+ done: function done(buffer)
|
|
|
+ {
|
|
|
+ dbg_assert(buffer.byteLength === len);
|
|
|
+ var block = new Uint8Array(buffer);
|
|
|
+ this.handle_read(offset, len, block);
|
|
|
+ fn(block);
|
|
|
+ }.bind(this),
|
|
|
+ });
|
|
|
+ }
|
|
|
+ };
|
|
|
+
|
|
|
+ AsyncXHRPartfileBuffer.prototype.get_from_cache = AsyncXHRBuffer.prototype.get_from_cache;
|
|
|
+ AsyncXHRPartfileBuffer.prototype.set = AsyncXHRBuffer.prototype.set;
|
|
|
+ AsyncXHRPartfileBuffer.prototype.handle_read = AsyncXHRBuffer.prototype.handle_read;
|
|
|
+ //AsyncXHRPartfileBuffer.prototype.get_block_cache = AsyncXHRBuffer.prototype.get_block_cache;
|
|
|
+ AsyncXHRPartfileBuffer.prototype.get_state = AsyncXHRBuffer.prototype.get_state;
|
|
|
+ AsyncXHRPartfileBuffer.prototype.set_state = AsyncXHRBuffer.prototype.set_state;
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Synchronous access to File, loading blocks from the input type=file
|
|
|
+ * The whole file is loaded into memory during initialisation
|
|
|
+ *
|
|
|
+ * @constructor
|
|
|
+ */
|
|
|
+ function SyncFileBuffer(file)
|
|
|
+ {
|
|
|
+ this.file = file;
|
|
|
+ this.byteLength = file.size;
|
|
|
+
|
|
|
+ if(file.size > (1 << 30))
|
|
|
+ {
|
|
|
+ console.warn("SyncFileBuffer: Allocating buffer of " + (file.size >> 20) + " MB ...");
|
|
|
+ }
|
|
|
+
|
|
|
+ this.buffer = new ArrayBuffer(file.size);
|
|
|
+
|
|
|
+ this.onload = undefined;
|
|
|
+ this.onprogress = undefined;
|
|
|
+ }
|
|
|
+
|
|
|
+ SyncFileBuffer.prototype.load = function()
|
|
|
+ {
|
|
|
+ this.load_next(0);
|
|
|
+ };
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param {number} start
|
|
|
+ */
|
|
|
+ SyncFileBuffer.prototype.load_next = function(start)
|
|
|
+ {
|
|
|
+ /** @const */
|
|
|
+ var PART_SIZE = 4 << 20;
|
|
|
+
|
|
|
+ var filereader = new FileReader();
|
|
|
+
|
|
|
+ filereader.onload = function(e)
|
|
|
+ {
|
|
|
+ var buffer = new Uint8Array(e.target.result);
|
|
|
+ new Uint8Array(this.buffer, start).set(buffer);
|
|
|
+ this.load_next(start + PART_SIZE);
|
|
|
+ }.bind(this);
|
|
|
+
|
|
|
+ if(this.onprogress)
|
|
|
+ {
|
|
|
+ this.onprogress({
|
|
|
+ loaded: start,
|
|
|
+ total: this.byteLength,
|
|
|
+ lengthComputable: true,
|
|
|
+ });
|
|
|
+ }
|
|
|
+
|
|
|
+ if(start < this.byteLength)
|
|
|
+ {
|
|
|
+ var end = Math.min(start + PART_SIZE, this.byteLength);
|
|
|
+ var slice = this.file.slice(start, end);
|
|
|
+ filereader.readAsArrayBuffer(slice);
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ this.file = undefined;
|
|
|
+ this.onload && this.onload({ buffer: this.buffer });
|
|
|
+ }
|
|
|
+ };
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param {number} start
|
|
|
+ * @param {number} len
|
|
|
+ * @param {function(!Uint8Array)} fn
|
|
|
+ */
|
|
|
+ SyncFileBuffer.prototype.get = function(start, len, fn)
|
|
|
+ {
|
|
|
+ dbg_assert(start + len <= this.byteLength);
|
|
|
+ fn(new Uint8Array(this.buffer, start, len));
|
|
|
+ };
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param {number} offset
|
|
|
+ * @param {!Uint8Array} slice
|
|
|
+ * @param {function()} fn
|
|
|
+ */
|
|
|
+ SyncFileBuffer.prototype.set = function(offset, slice, fn)
|
|
|
+ {
|
|
|
+ dbg_assert(offset + slice.byteLength <= this.byteLength);
|
|
|
+
|
|
|
+ new Uint8Array(this.buffer, offset, slice.byteLength).set(slice);
|
|
|
+ fn();
|
|
|
+ };
|
|
|
+
|
|
|
+ SyncFileBuffer.prototype.get_buffer = function(fn)
|
|
|
+ {
|
|
|
+ fn(this.buffer);
|
|
|
+ };
|
|
|
+
|
|
|
+ SyncFileBuffer.prototype.get_state = function()
|
|
|
+ {
|
|
|
+ const state = [];
|
|
|
+ state[0] = this.byteLength;
|
|
|
+ state[1] = new Uint8Array(this.buffer);
|
|
|
+ return state;
|
|
|
+ };
|
|
|
+
|
|
|
+ SyncFileBuffer.prototype.set_state = function(state)
|
|
|
+ {
|
|
|
+ this.byteLength = state[0];
|
|
|
+ this.buffer = state[1].slice().buffer;
|
|
|
+ };
|
|
|
+
|
|
|
+ /**
|
|
|
+ * Asynchronous access to File, loading blocks from the input type=file
|
|
|
+ *
|
|
|
+ * @constructor
|
|
|
+ */
|
|
|
+ function AsyncFileBuffer(file)
|
|
|
+ {
|
|
|
+ this.file = file;
|
|
|
+ this.byteLength = file.size;
|
|
|
+
|
|
|
+ this.block_cache = new Map();
|
|
|
+ this.block_cache_is_write = new Set();
|
|
|
+
|
|
|
+ this.onload = undefined;
|
|
|
+ this.onprogress = undefined;
|
|
|
+ }
|
|
|
+
|
|
|
+ AsyncFileBuffer.prototype.load = function()
|
|
|
+ {
|
|
|
+ this.onload && this.onload(Object.create(null));
|
|
|
+ };
|
|
|
+
|
|
|
+ /**
|
|
|
+ * @param {number} offset
|
|
|
+ * @param {number} len
|
|
|
+ * @param {function(!Uint8Array)} fn
|
|
|
+ */
|
|
|
+ AsyncFileBuffer.prototype.get = function(offset, len, fn)
|
|
|
+ {
|
|
|
+ dbg_assert(offset % BLOCK_SIZE === 0);
|
|
|
+ dbg_assert(len % BLOCK_SIZE === 0);
|
|
|
+ dbg_assert(len);
|
|
|
+
|
|
|
+ var block = this.get_from_cache(offset, len);
|
|
|
+ if(block)
|
|
|
+ {
|
|
|
+ fn(block);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+
|
|
|
+ var fr = new FileReader();
|
|
|
+
|
|
|
+ fr.onload = function(e)
|
|
|
+ {
|
|
|
+ var buffer = e.target.result;
|
|
|
+ var block = new Uint8Array(buffer);
|
|
|
+
|
|
|
+ this.handle_read(offset, len, block);
|
|
|
+ fn(block);
|
|
|
+ }.bind(this);
|
|
|
+
|
|
|
+ fr.readAsArrayBuffer(this.file.slice(offset, offset + len));
|
|
|
+ };
|
|
|
+ AsyncFileBuffer.prototype.get_from_cache = AsyncXHRBuffer.prototype.get_from_cache;
|
|
|
+ AsyncFileBuffer.prototype.set = AsyncXHRBuffer.prototype.set;
|
|
|
+ AsyncFileBuffer.prototype.handle_read = AsyncXHRBuffer.prototype.handle_read;
|
|
|
+ AsyncFileBuffer.prototype.get_state = AsyncXHRBuffer.prototype.get_state;
|
|
|
+ AsyncFileBuffer.prototype.set_state = AsyncXHRBuffer.prototype.set_state;
|
|
|
+
|
|
|
+ AsyncFileBuffer.prototype.get_buffer = function(fn)
|
|
|
+ {
|
|
|
+ // We must load all parts, unlikely a good idea for big files
|
|
|
+ fn();
|
|
|
+ };
|
|
|
+
|
|
|
+ AsyncFileBuffer.prototype.get_as_file = function(name)
|
|
|
+ {
|
|
|
+ var parts = [];
|
|
|
+ var existing_blocks = Array.from(this.block_cache.keys()).sort(function(x, y) { return x - y; });
|
|
|
+
|
|
|
+ var current_offset = 0;
|
|
|
+
|
|
|
+ for(var i = 0; i < existing_blocks.length; i++)
|
|
|
+ {
|
|
|
+ var block_index = existing_blocks[i];
|
|
|
+ var block = this.block_cache.get(block_index);
|
|
|
+ var start = block_index * BLOCK_SIZE;
|
|
|
+ dbg_assert(start >= current_offset);
|
|
|
+
|
|
|
+ if(start !== current_offset)
|
|
|
+ {
|
|
|
+ parts.push(this.file.slice(current_offset, start));
|
|
|
+ current_offset = start;
|
|
|
+ }
|
|
|
+
|
|
|
+ parts.push(block);
|
|
|
+ current_offset += block.length;
|
|
|
+ }
|
|
|
+
|
|
|
+ if(current_offset !== this.file.size)
|
|
|
+ {
|
|
|
+ parts.push(this.file.slice(current_offset));
|
|
|
+ }
|
|
|
+
|
|
|
+ var file = new File(parts, name);
|
|
|
+ dbg_assert(file.size === this.file.size);
|
|
|
+
|
|
|
+ return file;
|
|
|
+ };
|
|
|
+
|
|
|
+ if(typeof XMLHttpRequest === "undefined")
|
|
|
+ {
|
|
|
+ var determine_size = function(path, cb)
|
|
|
+ {
|
|
|
+ require("fs")["stat"](path, (err, stats) =>
|
|
|
+ {
|
|
|
+ if(err)
|
|
|
+ {
|
|
|
+ cb(err);
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ cb(null, stats.size);
|
|
|
+ }
|
|
|
+ });
|
|
|
+ };
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ var determine_size = function(url, cb)
|
|
|
+ {
|
|
|
+ v86util.load_file(url, {
|
|
|
+ done: (buffer, http) =>
|
|
|
+ {
|
|
|
+ var header = http.getResponseHeader("Content-Range") || "";
|
|
|
+ var match = header.match(/\/(\d+)\s*$/);
|
|
|
+
|
|
|
+ if(match)
|
|
|
+ {
|
|
|
+ cb(null, +match[1]);
|
|
|
+ }
|
|
|
+ else
|
|
|
+ {
|
|
|
+ const error = "`Range: bytes=...` header not supported (Got `" + header + "`)";
|
|
|
+ cb(error);
|
|
|
+ }
|
|
|
+ },
|
|
|
+ headers: {
|
|
|
+ Range: "bytes=0-0",
|
|
|
+ }
|
|
|
+ });
|
|
|
+ };
|
|
|
+ }
|
|
|
+})();
|
Fabian