A source over a Blob -- in a browser, a File the user picked -- reading each range as it's asked for, without loading the whole file.
Blob
File
Optional
Readonly
Shown in error messages about this source, e.g. a file path.
Total size in bytes.
length bytes from offset, fewer only where the source ends. The returned bytes may be a view of the source's own memory, so a caller must not modify them.
length
offset
A source over a
Blob-- in a browser, aFilethe user picked -- reading each range as it's asked for, without loading the whole file.