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349
src/js/operations/Compress.js
Executable file
349
src/js/operations/Compress.js
Executable file
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/* globals Zlib, bzip2 */
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/**
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* Compression operations.
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*
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* @author n1474335 [n1474335@gmail.com]
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* @copyright Crown Copyright 2016
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* @license Apache-2.0
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*
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* @namespace
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*/
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var Compress = {
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/**
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* @constant
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* @default
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*/
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COMPRESSION_TYPE: ["Dynamic Huffman Coding", "Fixed Huffman Coding", "None (Store)"],
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/**
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* @constant
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* @default
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*/
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INFLATE_BUFFER_TYPE: ["Adaptive", "Block"],
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/**
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* @constant
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* @default
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*/
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COMPRESSION_METHOD: ["Deflate", "None (Store)"],
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/**
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* @constant
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* @default
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*/
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OS: ["MSDOS", "Unix", "Macintosh"],
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/**
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* @constant
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* @default
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*/
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RAW_COMPRESSION_TYPE_LOOKUP: {
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"Fixed Huffman Coding" : Zlib.RawDeflate.CompressionType.FIXED,
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"Dynamic Huffman Coding" : Zlib.RawDeflate.CompressionType.DYNAMIC,
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"None (Store)" : Zlib.RawDeflate.CompressionType.NONE,
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},
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/**
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* Raw Deflate operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_raw_deflate: function(input, args) {
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var deflate = new Zlib.RawDeflate(input, {
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compressionType: Compress.RAW_COMPRESSION_TYPE_LOOKUP[args[0]]
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});
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return Array.prototype.slice.call(deflate.compress());
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},
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/**
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* @constant
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* @default
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*/
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INFLATE_INDEX: 0,
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/**
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* @constant
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* @default
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*/
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INFLATE_BUFFER_SIZE: 0,
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/**
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* @constant
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* @default
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*/
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INFLATE_RESIZE: false,
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/**
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* @constant
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* @default
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*/
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INFLATE_VERIFY: false,
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/**
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* @constant
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* @default
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*/
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RAW_BUFFER_TYPE_LOOKUP: {
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"Adaptive" : Zlib.RawInflate.BufferType.ADAPTIVE,
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"Block" : Zlib.RawInflate.BufferType.BLOCK,
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},
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/**
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* Raw Inflate operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_raw_inflate: function(input, args) {
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// Deal with character encoding issues
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input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
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var inflate = new Zlib.RawInflate(input, {
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index: args[0],
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bufferSize: args[1],
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bufferType: Compress.RAW_BUFFER_TYPE_LOOKUP[args[2]],
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resize: args[3],
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verify: args[4]
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}),
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result = Array.prototype.slice.call(inflate.decompress());
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// Raw Inflate somethimes messes up and returns nonsense like this:
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// ]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]....]...
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// e.g. Input data of [8b, 1d, dc, 44]
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// Look for the first two square brackets:
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if (result.length > 158 && result[0] == 93 && result[5] == 93) {
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// If the first two square brackets are there, check that the others
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// are also there. If they are, throw an error. If not, continue.
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var valid = false;
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for (var i = 0; i < 155; i += 5) {
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if (result[i] != 93) {
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valid = true;
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}
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}
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if (!valid) {
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throw "Error: Unable to inflate data";
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}
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}
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// Trust me, this is the easiest way...
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return result;
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},
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/**
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* @constant
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* @default
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*/
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ZLIB_COMPRESSION_TYPE_LOOKUP: {
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"Fixed Huffman Coding" : Zlib.Deflate.CompressionType.FIXED,
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"Dynamic Huffman Coding" : Zlib.Deflate.CompressionType.DYNAMIC,
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"None (Store)" : Zlib.Deflate.CompressionType.NONE,
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},
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/**
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* Zlib Deflate operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_zlib_deflate: function(input, args) {
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var deflate = new Zlib.Deflate(input, {
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compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[0]]
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});
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return Array.prototype.slice.call(deflate.compress());
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},
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/**
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* @constant
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* @default
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*/
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ZLIB_BUFFER_TYPE_LOOKUP: {
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"Adaptive" : Zlib.Inflate.BufferType.ADAPTIVE,
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"Block" : Zlib.Inflate.BufferType.BLOCK,
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},
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/**
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* Zlib Inflate operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_zlib_inflate: function(input, args) {
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// Deal with character encoding issues
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input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
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var inflate = new Zlib.Inflate(input, {
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index: args[0],
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bufferSize: args[1],
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bufferType: Compress.ZLIB_BUFFER_TYPE_LOOKUP[args[2]],
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resize: args[3],
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verify: args[4]
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});
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return Array.prototype.slice.call(inflate.decompress());
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},
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/**
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* @constant
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* @default
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*/
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GZIP_CHECKSUM: false,
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/**
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* Gzip operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_gzip: function(input, args) {
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var filename = args[1],
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comment = args[2],
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options = {
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deflateOptions: {
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compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[0]]
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},
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flags: {
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fhcrc: args[3]
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}
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};
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if (filename.length) {
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options.flags.fname = true;
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options.filename = filename;
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}
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if (comment.length) {
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options.flags.fcommenct = true;
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options.comment = comment;
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}
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var gzip = new Zlib.Gzip(input, options);
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return Array.prototype.slice.call(gzip.compress());
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},
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/**
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* Gunzip operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_gunzip: function(input, args) {
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// Deal with character encoding issues
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input = Utils.str_to_byte_array(Utils.byte_array_to_utf8(input));
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var gunzip = new Zlib.Gunzip(input);
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return Array.prototype.slice.call(gunzip.decompress());
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},
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/**
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* @constant
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* @default
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*/
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PKZIP_FILENAME: "file.txt",
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/**
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* @constant
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* @default
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*/
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ZIP_COMPRESSION_METHOD_LOOKUP: {
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"Deflate" : Zlib.Zip.CompressionMethod.DEFLATE,
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"None (Store)" : Zlib.Zip.CompressionMethod.STORE
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},
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/**
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* @constant
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* @default
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*/
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ZIP_OS_LOOKUP: {
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"MSDOS" : Zlib.Zip.OperatingSystem.MSDOS,
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"Unix" : Zlib.Zip.OperatingSystem.UNIX,
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"Macintosh" : Zlib.Zip.OperatingSystem.MACINTOSH
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},
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/**
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* Zip operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {byte_array}
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*/
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run_pkzip: function(input, args) {
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var password = Utils.str_to_byte_array(args[2]),
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options = {
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filename: Utils.str_to_byte_array(args[0]),
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comment: Utils.str_to_byte_array(args[1]),
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compressionMethod: Compress.ZIP_COMPRESSION_METHOD_LOOKUP[args[3]],
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os: Compress.ZIP_OS_LOOKUP[args[4]],
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deflateOption: {
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compressionType: Compress.ZLIB_COMPRESSION_TYPE_LOOKUP[args[5]]
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},
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},
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zip = new Zlib.Zip();
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if (password.length)
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zip.setPassword(password);
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zip.addFile(input, options);
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return Array.prototype.slice.call(zip.compress());
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},
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/**
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* @constant
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* @default
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*/
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PKUNZIP_VERIFY: false,
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/**
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* Unzip operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run_pkunzip: function(input, args) {
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var options = {
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password: Utils.str_to_byte_array(args[0]),
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verify: args[1]
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},
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file = "",
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unzip = new Zlib.Unzip(input, options),
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filenames = unzip.getFilenames(),
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output = "<div style='padding: 5px;'>" + filenames.length + " file(s) found</div>\n";
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output += "<div class='panel-group' id='zip-accordion' role='tablist' aria-multiselectable='true'>";
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window.uzip = unzip;
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for (var i = 0; i < filenames.length; i++) {
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file = Utils.byte_array_to_utf8(unzip.decompress(filenames[i]));
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output += "<div class='panel panel-default'>" +
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"<div class='panel-heading' role='tab' id='heading" + i + "'>" +
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"<h4 class='panel-title'>" +
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"<a class='collapsed' role='button' data-toggle='collapse' data-parent='#zip-accordion' href='#collapse" + i +
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"' aria-expanded='true' aria-controls='collapse" + i + "'>" +
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filenames[i] + "<span class='pull-right'>" + file.length.toLocaleString() + " bytes</span></a></h4></div>" +
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"<div id='collapse" + i + "' class='panel-collapse collapse' role='tabpanel' aria-labelledby='heading" + i + "'>" +
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"<div class='panel-body'>" +
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Utils.escape_html(file) + "</div></div></div>";
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}
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return output + "</div>";
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},
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/**
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* Bzip2 Decompress operation.
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*
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* @param {byte_array} input
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* @param {Object[]} args
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* @returns {string}
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*/
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run_bzip2_decompress: function(input, args) {
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var compressed = new Uint8Array(input),
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bzip2_reader,
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plain = "";
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bzip2_reader = bzip2.array(compressed);
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plain = bzip2.simple(bzip2_reader);
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return plain;
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},
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};
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