ethonion10/v86
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Implement alternative format for partfiles

Browse source
This commit is contained in:
Fabian 2022-07-28 02:58:45 +09:00
commit d2ca7b1afc
1 changed files with 18 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

23
src/browser/lib.js
View file

@ -495,14 +495,16 @@ var ASYNC_SAFE = false;
/**
* Asynchronous access to ArrayBuffer, loading blocks lazily as needed,
* downloading files named filename-\d-\d.ext.
* 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)
function AsyncXHRPartfileBuffer(filename, size, fixed_chunk_size, partfile_alt_format)
{
const parts = filename.match(/(.*)(\..*)/);
@ -524,6 +526,7 @@ var ASYNC_SAFE = false;
this.byteLength = size;
this.fixed_chunk_size = fixed_chunk_size;
this.partfile_alt_format = !!partfile_alt_format;
this.cache_reads = !!fixed_chunk_size; // TODO: could also be useful in other cases (needs testing)
@ -579,9 +582,19 @@ var ASYNC_SAFE = false;
for(let i = 0; i < total_count; i++)
{
// matches output of gnu split:
// split -b 512 -a8 -d --additional-suffix .img w95.img w95-
const part_filename = this.basename + "-" + (start_index + i + "").padStart(8, "0") + this.extension;
let part_filename;
if(this.partfile_alt_format)
{
// matches output of gnu split:
// split -b 512 -a8 -d --additional-suffix .img w95.img w95-
part_filename = this.basename + "-" + (start_index + i + "").padStart(8, "0") + this.extension;
}
else
{
const offset = ((start_index + i) * this.fixed_chunk_size);
part_filename = this.basename + "-" + offset + "-" + (offset + this.fixed_chunk_size) + this.extension;
}
v86util.load_file(part_filename, {
done: function done(buffer)