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Add support for fixed_chunk_size to async Range downloads (#755)

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Adrian Siekierka 2022-11-01 20:30:38 +01:00 committed by GitHub
parent 875e01202c
commit 7f5fb11faf
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 24 additions and 5 deletions
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2
src/browser/starter.js
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@ -441,7 +441,7 @@ V86Starter.prototype.continue_init = async function(emulator, options)
}
else
{
buffer = new v86util.AsyncXHRBuffer(file.url, file.size);
buffer = new v86util.AsyncXHRBuffer(file.url, file.size, file.fixed_chunk_size);
}
files_to_load.push({

27
src/buffer.js
View file

@ -94,8 +94,9 @@
* @constructor
* @param {string} filename Name of the file to download
* @param {number|undefined} size
* @param {number|undefined} fixed_chunk_size
*/
function AsyncXHRBuffer(filename, size)
function AsyncXHRBuffer(filename, size, fixed_chunk_size)
{
this.filename = filename;
@ -104,6 +105,9 @@
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;
}
@ -194,14 +198,29 @@
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(offset, len, block);
fn(block);
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: offset, length: len },
range: { start: requested_start, length: requested_length },
});
};