mailiverse/web/WebContent/js/zip/support.js

59 lines
1.1 KiB
JavaScript

// because the inflate.js & deflate.js write to the zip variable blah
zip = {};
function join_uint8arrays (arrays)
{
var l = 0, i, j;
for (i=0; i<arrays.length; ++i)
l += arrays[i] ? arrays[i].length : 0;
var result = new Uint8Array(l);
l = 0;
for (i=0; i<arrays.length; ++i)
{
var array = arrays[i];
if (array)
{
for (j=0; j<array.length; j++)
result[l++] = array[j];
}
}
return result;
}
function do_inflate(data)
{
data = join_uint8arrays([data]);
var inflater = new zip.Inflater();
var dataWithoutHeaderOrCrc = data.subarray(2, data.length-4);
var results = [ inflater.append(dataWithoutHeaderOrCrc) ];
results.push(inflater.flush());
return join_uint8arrays(results);
}
function do_deflate(data)
{
data = join_uint8arrays([data]);
var deflater = new zip.Deflater();
var header = new Uint8Array(2);
header[0] = 0x78;
header[1] = 0x9c;
var crc = new Uint8Array(4);
crc[0] = crc[1] = crc[2] = crc[3] = 0;
var results = [];
results.push(header);
results.push(deflater.append(data));
results.push(deflater.flush());
results.push(crc);
return join_uint8arrays(results);
}