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- "use strict";
- (function()
- {
- v86util.SyncBuffer = SyncBuffer;
- v86util.AsyncXHRBuffer = AsyncXHRBuffer;
- v86util.AsyncXHRPartfileBuffer = AsyncXHRPartfileBuffer;
- v86util.AsyncFileBuffer = AsyncFileBuffer;
- v86util.SyncFileBuffer = SyncFileBuffer;
- v86util.buffer_from_object = buffer_from_object;
- // The smallest size the emulated hardware can emit
- const BLOCK_SIZE = 256;
- const ASYNC_SAFE = false;
- /**
- * Synchronous access to ArrayBuffer
- * @constructor
- */
- function SyncBuffer(buffer)
- {
- dbg_assert(buffer instanceof ArrayBuffer);
- this.buffer = buffer;
- this.byteLength = buffer.byteLength;
- this.onload = undefined;
- this.onprogress = undefined;
- }
- SyncBuffer.prototype.load = function()
- {
- this.onload && this.onload({ buffer: this.buffer });
- };
- /**
- * @this {SyncBuffer|SyncFileBuffer}
- * @param {number} start
- * @param {number} len
- * @param {function(!Uint8Array)} fn
- */
- SyncBuffer.prototype.get = function(start, len, fn)
- {
- dbg_assert(start + len <= this.byteLength);
- fn(new Uint8Array(this.buffer, start, len));
- };
- /**
- * @this {SyncBuffer|SyncFileBuffer}
- * @param {number} start
- * @param {!Uint8Array} slice
- * @param {function()} fn
- */
- SyncBuffer.prototype.set = function(start, slice, fn)
- {
- dbg_assert(start + slice.byteLength <= this.byteLength);
- new Uint8Array(this.buffer, start, slice.byteLength).set(slice);
- fn();
- };
- /**
- * @this {SyncBuffer|SyncFileBuffer}
- * @param {function(!ArrayBuffer)} fn
- */
- SyncBuffer.prototype.get_buffer = function(fn)
- {
- fn(this.buffer);
- };
- /**
- * @this {SyncBuffer|SyncFileBuffer}
- */
- SyncBuffer.prototype.get_state = function()
- {
- const state = [];
- state[0] = this.byteLength;
- state[1] = new Uint8Array(this.buffer);
- return state;
- };
- /**
- * @this {SyncBuffer|SyncFileBuffer}
- */
- SyncBuffer.prototype.set_state = function(state)
- {
- this.byteLength = state[0];
- this.buffer = state[1].slice().buffer;
- };
- /**
- * Asynchronous access to ArrayBuffer, loading blocks lazily as needed,
- * using the `Range: bytes=...` header
- *
- * @constructor
- * @param {string} filename Name of the file to download
- * @param {number|undefined} size
- * @param {number|undefined} fixed_chunk_size
- */
- function AsyncXHRBuffer(filename, size, fixed_chunk_size)
- {
- this.filename = filename;
- this.byteLength = size;
- this.block_cache = new Map();
- this.block_cache_is_write = new Set();
- this.fixed_chunk_size = fixed_chunk_size;
- this.cache_reads = !!fixed_chunk_size; // TODO: could also be useful in other cases (needs testing)
- this.onload = undefined;
- this.onprogress = undefined;
- }
- AsyncXHRBuffer.prototype.load = function()
- {
- if(this.byteLength !== undefined)
- {
- this.onload && this.onload(Object.create(null));
- return;
- }
- // Determine the size using a request
- determine_size(this.filename, (error, size) =>
- {
- if(error)
- {
- throw new Error("Cannot use: " + this.filename + ". " + error);
- }
- else
- {
- dbg_assert(size >= 0);
- this.byteLength = size;
- this.onload && this.onload(Object.create(null));
- }
- });
- };
- /**
- * @param {number} offset
- * @param {number} len
- * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
- */
- AsyncXHRBuffer.prototype.get_from_cache = function(offset, len)
- {
- var number_of_blocks = len / BLOCK_SIZE;
- var block_index = offset / BLOCK_SIZE;
- for(var i = 0; i < number_of_blocks; i++)
- {
- var block = this.block_cache.get(block_index + i);
- if(!block)
- {
- return;
- }
- }
- if(number_of_blocks === 1)
- {
- return this.block_cache.get(block_index);
- }
- else
- {
- var result = new Uint8Array(len);
- for(var i = 0; i < number_of_blocks; i++)
- {
- result.set(this.block_cache.get(block_index + i), i * BLOCK_SIZE);
- }
- return result;
- }
- };
- /**
- * @param {number} offset
- * @param {number} len
- * @param {function(!Uint8Array)} fn
- */
- AsyncXHRBuffer.prototype.get = function(offset, len, fn)
- {
- dbg_assert(offset + len <= this.byteLength);
- 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)
- {
- if(ASYNC_SAFE)
- {
- setTimeout(fn.bind(this, block), 0);
- }
- else
- {
- fn(block);
- }
- return;
- }
- var requested_start = offset;
- var requested_length = len;
- if(this.fixed_chunk_size)
- {
- requested_start = offset - (offset % this.fixed_chunk_size);
- requested_length = Math.ceil((offset - requested_start + len) / this.fixed_chunk_size) * this.fixed_chunk_size;
- }
- v86util.load_file(this.filename, {
- done: function done(buffer)
- {
- var block = new Uint8Array(buffer);
- this.handle_read(requested_start, requested_length, block);
- if(requested_start === offset && requested_length === len)
- {
- fn(block);
- }
- else
- {
- fn(block.subarray(offset - requested_start, offset - requested_start + len));
- }
- }.bind(this),
- range: { start: requested_start, length: requested_length },
- });
- };
- /**
- * Relies on this.byteLength and this.block_cache
- *
- * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
- *
- * @param {number} start
- * @param {!Uint8Array} data
- * @param {function()} fn
- */
- AsyncXHRBuffer.prototype.set = function(start, data, fn)
- {
- var len = data.length;
- dbg_assert(start + data.byteLength <= this.byteLength);
- dbg_assert(start % BLOCK_SIZE === 0);
- dbg_assert(len % BLOCK_SIZE === 0);
- dbg_assert(len);
- var start_block = start / BLOCK_SIZE;
- var block_count = len / BLOCK_SIZE;
- for(var i = 0; i < block_count; i++)
- {
- var block = this.block_cache.get(start_block + i);
- if(block === undefined)
- {
- const data_slice = data.slice(i * BLOCK_SIZE, (i + 1) * BLOCK_SIZE);
- this.block_cache.set(start_block + i, data_slice);
- }
- else
- {
- const data_slice = data.subarray(i * BLOCK_SIZE, (i + 1) * BLOCK_SIZE);
- dbg_assert(block.byteLength === data_slice.length);
- block.set(data_slice);
- }
- this.block_cache_is_write.add(start_block + i);
- }
- fn();
- };
- /**
- * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
- * @param {number} offset
- * @param {number} len
- * @param {!Uint8Array} block
- */
- AsyncXHRBuffer.prototype.handle_read = function(offset, len, block)
- {
- // Used by AsyncXHRBuffer, AsyncXHRPartfileBuffer and AsyncFileBuffer
- // Overwrites blocks from the original source that have been written since
- var start_block = offset / BLOCK_SIZE;
- var block_count = len / BLOCK_SIZE;
- for(var i = 0; i < block_count; i++)
- {
- const cached_block = this.block_cache.get(start_block + i);
- if(cached_block)
- {
- block.set(cached_block, i * BLOCK_SIZE);
- }
- else if(this.cache_reads)
- {
- this.block_cache.set(start_block + i, block.slice(i * BLOCK_SIZE, (i + 1) * BLOCK_SIZE));
- }
- }
- };
- AsyncXHRBuffer.prototype.get_buffer = function(fn)
- {
- // We must download all parts, unlikely a good idea for big files
- fn();
- };
- ///**
- // * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
- // */
- //AsyncXHRBuffer.prototype.get_block_cache = function()
- //{
- // var count = Object.keys(this.block_cache).length;
- // var buffer = new Uint8Array(count * BLOCK_SIZE);
- // var indices = [];
- // var i = 0;
- // for(var index of Object.keys(this.block_cache))
- // {
- // var block = this.block_cache.get(index);
- // dbg_assert(block.length === BLOCK_SIZE);
- // index = +index;
- // indices.push(index);
- // buffer.set(
- // block,
- // i * BLOCK_SIZE
- // );
- // i++;
- // }
- // return {
- // buffer,
- // indices,
- // block_size: BLOCK_SIZE,
- // };
- //};
- /**
- * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
- */
- AsyncXHRBuffer.prototype.get_state = function()
- {
- const state = [];
- const block_cache = [];
- for(let [index, block] of this.block_cache)
- {
- dbg_assert(isFinite(index));
- if(this.block_cache_is_write.has(index))
- {
- block_cache.push([index, block]);
- }
- }
- state[0] = block_cache;
- return state;
- };
- /**
- * @this {AsyncXHRBuffer|AsyncXHRPartfileBuffer|AsyncFileBuffer}
- */
- AsyncXHRBuffer.prototype.set_state = function(state)
- {
- const block_cache = state[0];
- this.block_cache.clear();
- this.block_cache_is_write.clear();
- for(let [index, block] of block_cache)
- {
- dbg_assert(isFinite(index));
- this.block_cache.set(index, block);
- this.block_cache_is_write.add(index);
- }
- };
- /**
- * Asynchronous access to ArrayBuffer, loading blocks lazily as needed,
- * downloading files named filename-%d-%d.ext (where the %d are start and end offset).
- * Or, if partfile_alt_format is set, filename-%08d.ext (where %d is the part number, compatible with gnu split).
- *
- * @constructor
- * @param {string} filename Name of the file to download
- * @param {number|undefined} size
- * @param {number|undefined} fixed_chunk_size
- * @param {boolean|undefined} partfile_alt_format
- */
- function AsyncXHRPartfileBuffer(filename, size, fixed_chunk_size, partfile_alt_format, zstd_decompress)
- {
- const parts = filename.match(/\.[^\.]+(\.zst)?$/);
- this.extension = parts ? parts[0] : "";
- this.basename = filename.substring(0, filename.length - this.extension.length);
- this.is_zstd = this.extension.endsWith(".zst");
- if(!this.basename.endsWith("/"))
- {
- this.basename += "-";
- }
- this.block_cache = new Map();
- this.block_cache_is_write = new Set();
- this.byteLength = size;
- this.fixed_chunk_size = fixed_chunk_size;
- this.partfile_alt_format = !!partfile_alt_format;
- this.zstd_decompress = zstd_decompress;
- this.cache_reads = !!fixed_chunk_size; // TODO: could also be useful in other cases (needs testing)
- this.onload = undefined;
- this.onprogress = undefined;
- }
- AsyncXHRPartfileBuffer.prototype.load = function()
- {
- if(this.byteLength !== undefined)
- {
- this.onload && this.onload(Object.create(null));
- return;
- }
- dbg_assert(false);
- this.onload && this.onload(Object.create(null));
- };
- /**
- * @param {number} offset
- * @param {number} len
- * @param {function(!Uint8Array)} fn
- */
- AsyncXHRPartfileBuffer.prototype.get = function(offset, len, fn)
- {
- dbg_assert(offset + len <= this.byteLength);
- dbg_assert(offset % BLOCK_SIZE === 0);
- dbg_assert(len % BLOCK_SIZE === 0);
- dbg_assert(len);
- const block = this.get_from_cache(offset, len);
- if(block)
- {
- if(ASYNC_SAFE)
- {
- setTimeout(fn.bind(this, block), 0);
- }
- else
- {
- fn(block);
- }
- return;
- }
- if(this.fixed_chunk_size)
- {
- const start_index = Math.floor(offset / this.fixed_chunk_size);
- const m_offset = offset - start_index * this.fixed_chunk_size;
- dbg_assert(m_offset >= 0);
- const total_count = Math.ceil((m_offset + len) / this.fixed_chunk_size);
- const blocks = new Uint8Array(total_count * this.fixed_chunk_size);
- let finished = 0;
- for(let i = 0; i < total_count; i++)
- {
- const offset = (start_index + i) * this.fixed_chunk_size;
- const part_filename =
- this.partfile_alt_format ?
- // matches output of gnu split:
- // split -b 512 -a8 -d --additional-suffix .img w95.img w95-
- this.basename + (start_index + i + "").padStart(8, "0") + this.extension
- :
- 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)
- {
- blocks.set(block, i * this.fixed_chunk_size);
- finished++;
- if(finished === total_count)
- {
- fn(blocks.subarray(m_offset, m_offset + len));
- }
- }
- else
- {
- v86util.load_file(part_filename, {
- done: async function done(buffer)
- {
- let block = new Uint8Array(buffer);
- if(this.is_zstd)
- {
- const decompressed = await this.zstd_decompress(this.fixed_chunk_size, block);
- block = new Uint8Array(decompressed);
- }
- blocks.set(block, i * this.fixed_chunk_size);
- this.handle_read((start_index + i) * this.fixed_chunk_size, this.fixed_chunk_size|0, block);
- finished++;
- if(finished === total_count)
- {
- fn(blocks.subarray(m_offset, m_offset + len));
- }
- }.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 });
- }
- };
- SyncFileBuffer.prototype.get = SyncBuffer.prototype.get;
- SyncFileBuffer.prototype.set = SyncBuffer.prototype.set;
- SyncFileBuffer.prototype.get_buffer = SyncBuffer.prototype.get_buffer;
- SyncFileBuffer.prototype.get_state = SyncBuffer.prototype.get_state;
- SyncFileBuffer.prototype.set_state = SyncBuffer.prototype.set_state;
- /**
- * 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",
- }
- });
- };
- }
- function buffer_from_object(obj, zstd_decompress_worker)
- {
- // TODO: accept Uint8Array, ArrayBuffer, File, url rather than { url }
- if(obj.buffer instanceof ArrayBuffer)
- {
- return new v86util.SyncBuffer(obj.buffer);
- }
- else if(typeof File !== "undefined" && obj.buffer instanceof File)
- {
- // SyncFileBuffer:
- // - loads the whole disk image into memory, impossible for large files (more than 1GB)
- // - can later serve get/set operations fast and synchronously
- // - takes some time for first load, neglectable for small files (up to 100Mb)
- //
- // AsyncFileBuffer:
- // - loads slices of the file asynchronously as requested
- // - slower get/set
- // Heuristics: If file is larger than or equal to 256M, use AsyncFileBuffer
- let is_async = obj.async;
- if(is_async === undefined)
- {
- is_async = obj.buffer.size >= 256 * 1024 * 1024;
- }
- if(is_async)
- {
- return new v86util.AsyncFileBuffer(obj.buffer);
- }
- else
- {
- return new v86util.SyncFileBuffer(obj.buffer);
- }
- }
- else if(obj.url)
- {
- // Note: Only async for now
- if(obj.use_parts)
- {
- return new v86util.AsyncXHRPartfileBuffer(obj.url, obj.size, obj.fixed_chunk_size, false, zstd_decompress_worker);
- }
- else
- {
- return new v86util.AsyncXHRBuffer(obj.url, obj.size, obj.fixed_chunk_size);
- }
- }
- else
- {
- dbg_log("Ignored file: url=" + obj.url + " buffer=" + obj.buffer);
- }
- }
- })();
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