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<h1 class="page-title">Source: operations/Compress.js</h1>
<section>
<article>
<pre
class="sunlight-highlight-javascript linenums">/* globals Zlib, bzip2 */
/**
* Compression operations.
*
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright 2016
* @license Apache-2.0
*
* @namespace
*/
var Compress = {
/**
* @constant
* @default
*/
COMPRESSION_TYPE: ["Dynamic Huffman Coding", "Fixed Huffman Coding", "None (Store)"],
/**
* @constant
* @default
*/
INFLATE_BUFFER_TYPE: ["Adaptive", "Block"],
/**
* @constant
* @default
*/
COMPRESSION_METHOD: ["Deflate", "None (Store)"],
/**
* @constant
* @default
*/
OS: ["MSDOS", "Unix", "Macintosh"],
/**
* @constant
* @default
*/
RAW_COMPRESSION_TYPE_LOOKUP: {
"Fixed Huffman Coding" : Zlib.RawDeflate.CompressionType.FIXED,
"Dynamic Huffman Coding" : Zlib.RawDeflate.CompressionType.DYNAMIC,
"None (Store)" : Zlib.RawDeflate.CompressionType.NONE,
},
/**
* Raw Deflate operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_raw_deflate: function(input, args) {
var deflate = new Zlib.RawDeflate(input, {
compressionType: Compress.RAW_COMPRESSION_TYPE_LOOKUP[args[0]]
});
return Array.prototype.slice.call(deflate.compress());
},
/**
* @constant
* @default
*/
INFLATE_INDEX: 0,
/**
* @constant
* @default
*/
INFLATE_BUFFER_SIZE: 0,
/**
* @constant
* @default
*/
INFLATE_RESIZE: false,
/**
* @constant
* @default
*/
INFLATE_VERIFY: false,
/**
* @constant
* @default
*/
RAW_BUFFER_TYPE_LOOKUP: {
"Adaptive" : Zlib.RawInflate.BufferType.ADAPTIVE,
"Block" : Zlib.RawInflate.BufferType.BLOCK,
},
/**
* Raw Inflate operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_raw_inflate: function(input, args) {
// Deal with character encoding issues
input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
var inflate = new Zlib.RawInflate(input, {
index: args[0],
bufferSize: args[1],
bufferType: Compress.RAW_BUFFER_TYPE_LOOKUP[args[2]],
resize: args[3],
verify: args[4]
}),
result = Array.prototype.slice.call(inflate.decompress());
// Raw Inflate somethimes messes up and returns nonsense like this:
// ]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]...
// e.g. Input data of [8b, 1d, dc, 44]
// Look for the first two square brackets:
if (result.length > 158 &amp;&amp; result[0] == 93 &amp;&amp; result[5] == 93) {
// If the first two square brackets are there, check that the others
// are also there. If they are, throw an error. If not, continue.
var valid = false;
for (var i = 0; i &lt; 155; i += 5) {
if (result[i] != 93) {
valid = true;
}
}
if (!valid) {
throw "Error: Unable to inflate data";
}
}
// Trust me, this is the easiest way...
return result;
},
/**
* @constant
* @default
*/
ZLIB_COMPRESSION_TYPE_LOOKUP: {
"Fixed Huffman Coding" : Zlib.Deflate.CompressionType.FIXED,
"Dynamic Huffman Coding" : Zlib.Deflate.CompressionType.DYNAMIC,
"None (Store)" : Zlib.Deflate.CompressionType.NONE,
},
/**
* Zlib Deflate operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_zlib_deflate: function(input, args) {
var deflate = new Zlib.Deflate(input, {
compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[0]]
});
return Array.prototype.slice.call(deflate.compress());
},
/**
* @constant
* @default
*/
ZLIB_BUFFER_TYPE_LOOKUP: {
"Adaptive" : Zlib.Inflate.BufferType.ADAPTIVE,
"Block" : Zlib.Inflate.BufferType.BLOCK,
},
/**
* Zlib Inflate operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_zlib_inflate: function(input, args) {
// Deal with character encoding issues
input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
var inflate = new Zlib.Inflate(input, {
index: args[0],
bufferSize: args[1],
bufferType: Compress.ZLIB_BUFFER_TYPE_LOOKUP[args[2]],
resize: args[3],
verify: args[4]
});
return Array.prototype.slice.call(inflate.decompress());
},
/**
* @constant
* @default
*/
GZIP_CHECKSUM: false,
/**
* Gzip operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_gzip: function(input, args) {
var filename = args[1],
comment = args[2],
options = {
deflateOptions: {
compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[0]]
},
flags: {
fhcrc: args[3]
}
};
if (filename.length) {
options.flags.fname = true;
options.filename = filename;
}
if (comment.length) {
options.flags.fcommenct = true;
options.comment = comment;
}
var gzip = new Zlib.Gzip(input, options);
return Array.prototype.slice.call(gzip.compress());
},
/**
* Gunzip operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_gunzip: function(input, args) {
// Deal with character encoding issues
input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
var gunzip = new Zlib.Gunzip(input);
return Array.prototype.slice.call(gunzip.decompress());
},
/**
* @constant
* @default
*/
PKZIP_FILENAME: "file.txt",
/**
* @constant
* @default
*/
ZIP_COMPRESSION_METHOD_LOOKUP: {
"Deflate" : Zlib.Zip.CompressionMethod.DEFLATE,
"None (Store)" : Zlib.Zip.CompressionMethod.STORE
},
/**
* @constant
* @default
*/
ZIP_OS_LOOKUP: {
"MSDOS" : Zlib.Zip.OperatingSystem.MSDOS,
"Unix" : Zlib.Zip.OperatingSystem.UNIX,
"Macintosh" : Zlib.Zip.OperatingSystem.MACINTOSH
},
/**
* Zip operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {byte_array}
*/
run_pkzip: function(input, args) {
var password = Utils.str_to_byte_array(args[2]),
options = {
filename: Utils.str_to_byte_array(args[0]),
comment: Utils.str_to_byte_array(args[1]),
compressionMethod: Compress.ZIP_COMPRESSION_METHOD_LOOKUP[args[3]],
os: Compress.ZIP_OS_LOOKUP[args[4]],
deflateOption: {
compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[5]]
},
},
zip = new Zlib.Zip();
if (password.length)
zip.setPassword(password);
zip.addFile(input, options);
return Array.prototype.slice.call(zip.compress());
},
/**
* @constant
* @default
*/
PKUNZIP_VERIFY: false,
/**
* Unzip operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*/
run_pkunzip: function(input, args) {
var options = {
password: Utils.str_to_byte_array(args[0]),
verify: args[1]
},
file = "",
unzip = new Zlib.Unzip(input, options),
filenames = unzip.getFilenames(),
output = "&lt;div style='padding: 5px;'>" + filenames.length + " file(s) found&lt;/div>\n";
output += "&lt;div class='panel-group' id='zip-accordion' role='tablist' aria-multiselectable='true'>";
window.uzip = unzip;
for (var i = 0; i &lt; filenames.length; i++) {
file = Utils.byte_array_to_utf8(unzip.decompress(filenames[i]));
output += "&lt;div class='panel panel-default'>" +
"&lt;div class='panel-heading' role='tab' id='heading" + i + "'>" +
"&lt;h4 class='panel-title'>" +
"&lt;a class='collapsed' role='button' data-toggle='collapse' data-parent='#zip-accordion' href='#collapse" + i +
"' aria-expanded='true' aria-controls='collapse" + i + "'>" +
filenames[i] + "&lt;span class='pull-right'>" + file.length.toLocaleString() + " bytes&lt;/span>&lt;/a>&lt;/h4>&lt;/div>" +
"&lt;div id='collapse" + i + "' class='panel-collapse collapse' role='tabpanel' aria-labelledby='heading" + i + "'>" +
"&lt;div class='panel-body'>" +
Utils.escape_html(file) + "&lt;/div>&lt;/div>&lt;/div>";
}
return output + "&lt;/div>";
},
/**
* Bzip2 Decompress operation.
*
* @param {byte_array} input
* @param {Object[]} args
* @returns {string}
*/
run_bzip2_decompress: function(input, args) {
var compressed = new Uint8Array(input),
bzip2_reader,
plain = "";
bzip2_reader = bzip2.array(compressed);
plain = bzip2.simple(bzip2_reader);
return plain;
},
};
</pre>
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