mirror of
https://github.com/YunoHost-Apps/keeweb_ynh.git
synced 2024-09-03 19:26:33 +02:00
849 lines
29 KiB
JavaScript
849 lines
29 KiB
JavaScript
/**
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* @license node-stream-zip | (c) 2015 Antelle | https://github.com/antelle/node-stream-zip/blob/master/MIT-LICENSE.txt
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* Portions copyright https://github.com/cthackers/adm-zip | https://raw.githubusercontent.com/cthackers/adm-zip/master/MIT-LICENSE.txt
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*/
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// region Deps
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var
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util = require('util'),
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fs = require('fs'),
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path = require('path'),
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events = require('events'),
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zlib = require('zlib'),
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stream = require('stream');
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// endregion
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// region Constants
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var consts = {
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/* The local file header */
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LOCHDR : 30, // LOC header size
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LOCSIG : 0x04034b50, // "PK\003\004"
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LOCVER : 4, // version needed to extract
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LOCFLG : 6, // general purpose bit flag
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LOCHOW : 8, // compression method
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LOCTIM : 10, // modification time (2 bytes time, 2 bytes date)
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LOCCRC : 14, // uncompressed file crc-32 value
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LOCSIZ : 18, // compressed size
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LOCLEN : 22, // uncompressed size
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LOCNAM : 26, // filename length
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LOCEXT : 28, // extra field length
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/* The Data descriptor */
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EXTSIG : 0x08074b50, // "PK\007\008"
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EXTHDR : 16, // EXT header size
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EXTCRC : 4, // uncompressed file crc-32 value
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EXTSIZ : 8, // compressed size
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EXTLEN : 12, // uncompressed size
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/* The central directory file header */
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CENHDR : 46, // CEN header size
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CENSIG : 0x02014b50, // "PK\001\002"
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CENVEM : 4, // version made by
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CENVER : 6, // version needed to extract
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CENFLG : 8, // encrypt, decrypt flags
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CENHOW : 10, // compression method
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CENTIM : 12, // modification time (2 bytes time, 2 bytes date)
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CENCRC : 16, // uncompressed file crc-32 value
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CENSIZ : 20, // compressed size
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CENLEN : 24, // uncompressed size
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CENNAM : 28, // filename length
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CENEXT : 30, // extra field length
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CENCOM : 32, // file comment length
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CENDSK : 34, // volume number start
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CENATT : 36, // internal file attributes
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CENATX : 38, // external file attributes (host system dependent)
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CENOFF : 42, // LOC header offset
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/* The entries in the end of central directory */
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ENDHDR : 22, // END header size
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ENDSIG : 0x06054b50, // "PK\005\006"
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ENDSUB : 8, // number of entries on this disk
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ENDTOT : 10, // total number of entries
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ENDSIZ : 12, // central directory size in bytes
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ENDOFF : 16, // offset of first CEN header
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ENDCOM : 20, // zip file comment length
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MAXFILECOMMENT : 0xFFFF,
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/* Compression methods */
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STORED : 0, // no compression
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SHRUNK : 1, // shrunk
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REDUCED1 : 2, // reduced with compression factor 1
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REDUCED2 : 3, // reduced with compression factor 2
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REDUCED3 : 4, // reduced with compression factor 3
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REDUCED4 : 5, // reduced with compression factor 4
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IMPLODED : 6, // imploded
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// 7 reserved
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DEFLATED : 8, // deflated
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ENHANCED_DEFLATED: 9, // enhanced deflated
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PKWARE : 10,// PKWare DCL imploded
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// 11 reserved
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BZIP2 : 12, // compressed using BZIP2
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// 13 reserved
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LZMA : 14, // LZMA
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// 15-17 reserved
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IBM_TERSE : 18, // compressed using IBM TERSE
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IBM_LZ77 : 19, //IBM LZ77 z
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/* General purpose bit flag */
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FLG_ENC : 0, // encrypted file
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FLG_COMP1 : 1, // compression option
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FLG_COMP2 : 2, // compression option
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FLG_DESC : 4, // data descriptor
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FLG_ENH : 8, // enhanced deflation
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FLG_STR : 16, // strong encryption
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FLG_LNG : 1024, // language encoding
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FLG_MSK : 4096, // mask header values
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FLG_ENTRY_ENC : 1,
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/* 4.5 Extensible data fields */
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EF_ID : 0,
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EF_SIZE : 2,
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/* Header IDs */
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ID_ZIP64 : 0x0001,
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ID_AVINFO : 0x0007,
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ID_PFS : 0x0008,
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ID_OS2 : 0x0009,
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ID_NTFS : 0x000a,
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ID_OPENVMS : 0x000c,
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ID_UNIX : 0x000d,
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ID_FORK : 0x000e,
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ID_PATCH : 0x000f,
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ID_X509_PKCS7 : 0x0014,
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ID_X509_CERTID_F : 0x0015,
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ID_X509_CERTID_C : 0x0016,
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ID_STRONGENC : 0x0017,
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ID_RECORD_MGT : 0x0018,
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ID_X509_PKCS7_RL : 0x0019,
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ID_IBM1 : 0x0065,
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ID_IBM2 : 0x0066,
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ID_POSZIP : 0x4690,
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EF_ZIP64_OR_32 : 0xffffffff,
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EF_ZIP64_OR_16 : 0xffff,
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EF_ZIP64_SUNCOMP : 0,
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EF_ZIP64_SCOMP : 8,
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EF_ZIP64_RHO : 16,
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EF_ZIP64_DSN : 24
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};
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// endregion
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// region StreamZip
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var StreamZip = function(config) {
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var
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fd,
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fileSize,
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chunkSize,
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ready = false,
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that = this,
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op,
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centralDirectory,
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entries = config.storeEntries !== false ? {} : null,
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fileName = config.file;
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open();
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function open() {
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fs.open(fileName, 'r', function(err, f) {
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if (err)
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return that.emit('error', err);
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fd = f;
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fs.fstat(fd, function(err, stat) {
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if (err)
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return that.emit('error', err);
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fileSize = stat.size;
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chunkSize = config.chunkSize || Math.round(fileSize / 1000);
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chunkSize = Math.max(Math.min(chunkSize, Math.min(128*1024, fileSize)), Math.min(1024, fileSize));
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readCentralDirectory();
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});
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});
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}
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function readCentralDirectory() {
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var totalReadLength = Math.min(consts.ENDHDR + consts.MAXFILECOMMENT, fileSize);
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op = {
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win: new FileWindowBuffer(fd),
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totalReadLength: totalReadLength,
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minPos: fileSize - totalReadLength,
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lastPos: fileSize,
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chunkSize: 1024
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};
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op.win.read(fileSize - op.chunkSize, op.chunkSize, readCentralDirectoryCallback);
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}
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function readCentralDirectoryCallback(err, bytesRead) {
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if (err || !bytesRead)
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return that.emit('error', err || 'Archive read error');
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var
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buffer = op.win.buffer,
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pos = op.lastPos,
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bufferPosition = pos - op.win.position,
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minPos = Math.max(op.minPos, bufferPosition);
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while (--pos >= minPos && --bufferPosition >= 0) {
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if (buffer[bufferPosition] === 0x50) { // quick check that the byte is 'P'
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if (buffer.readUInt32LE(bufferPosition) === consts.ENDSIG) { // "PK\005\006"
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op = {};
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try {
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centralDirectory = new CentralDirectoryHeader();
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centralDirectory.read(buffer.slice(bufferPosition, bufferPosition + consts.ENDHDR));
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centralDirectory.headerOffset = pos;
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if (centralDirectory.commentLength)
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that.comment = buffer.slice(bufferPosition + consts.ENDHDR,
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bufferPosition + consts.ENDHDR + centralDirectory.commentLength).toString();
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else
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that.comment = null;
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that.entriesCount = centralDirectory.volumeEntries;
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that.centralDirectory = centralDirectory;
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readEntries();
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} catch (err) {
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that.emit('error', err);
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}
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return;
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}
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}
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}
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if (pos === minPos) {
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return that.emit('error', 'Bad archive format');
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}
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op.lastPos = pos + 1;
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op.chunkSize *= 2;
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if (pos <= minPos)
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return that.emit('error', 'Bad archive');
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var expandLength = Math.min(op.chunkSize, pos - minPos);
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op.win.expandLeft(expandLength, readCentralDirectoryCallback);
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}
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function readEntries() {
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op = {
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win: new FileWindowBuffer(fd),
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pos: centralDirectory.offset,
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chunkSize: chunkSize,
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entriesLeft: centralDirectory.volumeEntries
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};
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op.win.read(op.pos, Math.min(chunkSize, fileSize - op.pos), readEntriesCallback);
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}
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function readEntriesCallback(err, bytesRead) {
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if (err || !bytesRead)
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return that.emit('error', err || 'Entries read error');
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var
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buffer = op.win.buffer,
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bufferPos = op.pos - op.win.position,
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bufferLength = buffer.length,
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entry = op.entry;
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try {
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while (op.entriesLeft > 0) {
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if (!entry) {
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entry = new ZipEntry();
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entry.readHeader(buffer, bufferPos);
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entry.headerOffset = op.pos;
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op.entry = entry;
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op.pos += consts.CENHDR;
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bufferPos += consts.CENHDR;
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}
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var entryHeaderSize = entry.fnameLen + entry.extraLen + entry.comLen;
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var advanceBytes = entryHeaderSize + (op.entriesLeft > 1 ? consts.CENHDR : 0);
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if (bufferLength - bufferPos < advanceBytes) {
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op.win.moveRight(chunkSize, readEntriesCallback, bufferPos);
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op.move = true;
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return;
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}
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entry.read(buffer, bufferPos);
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if (entries)
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entries[entry.name] = entry;
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that.emit('entry', entry);
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op.entry = entry = null;
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op.entriesLeft--;
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op.pos += entryHeaderSize;
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bufferPos += entryHeaderSize;
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}
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that.emit('ready');
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} catch (err) {
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that.emit('error', err);
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}
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}
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function checkEntriesExist() {
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if (!entries)
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throw 'storeEntries disabled';
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}
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Object.defineProperty(this, 'ready', { get: function() { return ready; } });
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this.entry = function(name) {
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checkEntriesExist();
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return entries[name];
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};
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this.entries = function() {
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checkEntriesExist();
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return entries;
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};
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this.stream = function(entry, callback) {
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return openEntry(entry, function(err, entry) {
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if (err)
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return callback(err);
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var offset = dataOffset(entry);
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var entryStream = new EntryDataReaderStream(fd, offset, entry.compressedSize);
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if (entry.method === consts.STORED) {
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} else if (entry.method === consts.DEFLATED || entry.method === consts.ENHANCED_DEFLATED) {
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entryStream = entryStream.pipe(zlib.createInflateRaw());
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} else {
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return callback('Unknown compression method: ' + entry.method);
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}
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if (canVerifyCrc(entry))
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entryStream = entryStream.pipe(new EntryVerifyStream(entryStream, entry.crc, entry.size));
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callback(null, entryStream);
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}, false);
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};
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this.entryDataSync = function(entry) {
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var err = null;
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openEntry(entry, function(e, en) {
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err = e;
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entry = en;
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}, true);
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if (err)
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throw err;
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var
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data = new Buffer(entry.compressedSize),
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bytesRead;
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new FsRead(fd, data, 0, entry.compressedSize, dataOffset(entry), function(e, br) {
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err = e;
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bytesRead = br;
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}).read(true);
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if (err)
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throw err;
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if (entry.method === consts.STORED) {
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} else if (entry.method === consts.DEFLATED || entry.method === consts.ENHANCED_DEFLATED) {
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data = zlib.inflateRawSync(data);
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} else {
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throw 'Unknown compression method: ' + entry.method;
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}
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if (data.length !== entry.size)
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throw 'Invalid size';
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if (canVerifyCrc(entry)) {
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var verify = new CrcVerify(entry.crc, entry.size);
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verify.data(data);
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}
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return data;
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};
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function openEntry(entry, callback, sync) {
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if (typeof entry === 'string') {
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checkEntriesExist();
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entry = entries[entry];
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if (!entry)
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return callback('Entry not found');
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}
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if (!entry.isFile)
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return callback('Entry is not file');
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if (!fd)
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return callback('Archive closed');
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var buffer = new Buffer(consts.LOCHDR);
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new FsRead(fd, buffer, 0, buffer.length, entry.offset, function(err) {
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if (err)
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return callback(err);
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try {
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entry.readDataHeader(buffer);
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if (entry.encrypted) {
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return callback('Entry encrypted');
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}
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callback(null, entry);
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} catch (ex) {
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callback(ex);
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}
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}).read(sync);
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}
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function dataOffset(entry) {
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return entry.offset + consts.LOCHDR + entry.fnameLen + entry.extraLen;
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}
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function canVerifyCrc(entry) {
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// if bit 3 (0x08) of the general-purpose flags field is set, then the CRC-32 and file sizes are not known when the header is written
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return (entry.flags & 0x8) != 0x8
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}
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function extract(entry, outPath, callback) {
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that.stream(entry, function (err, stm) {
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if (err) {
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callback(err);
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} else {
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var fsStm, errThrown;
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stm.on('error', function(err) {
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errThrown = err;
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if (fsStm) {
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stm.unpipe(fsStm);
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fsStm.close(function () {
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callback(err);
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});
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}
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});
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fs.open(outPath, 'w', function(err, fdFile) {
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if (err)
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return callback(err || errThrown);
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if (errThrown) {
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fs.close(fd, function() {
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callback(errThrown);
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});
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return;
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}
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fsStm = fs.createWriteStream(outPath, { fd: fdFile });
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fsStm.on('finish', function() {
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that.emit('extract', entry, outPath);
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if (!errThrown)
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callback();
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});
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stm.pipe(fsStm);
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});
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}
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});
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}
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function createDirectories(baseDir, dirs, callback) {
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if (!dirs.length)
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return callback();
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var dir = dirs.shift();
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dir = path.join(baseDir, path.join.apply(path, dir));
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fs.mkdir(dir, function(err) {
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if (err && err.code !== 'EEXIST')
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return callback(err);
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createDirectories(baseDir, dirs, callback);
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});
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}
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function extractFiles(baseDir, baseRelPath, files, callback, extractedCount) {
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if (!files.length)
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return callback(null, extractedCount);
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var file = files.shift();
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var targetPath = path.join(baseDir, file.name.replace(baseRelPath, ''));
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extract(file, targetPath, function (err) {
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if (err)
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return callback(err, extractedCount);
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extractFiles(baseDir, baseRelPath, files, callback, extractedCount + 1);
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});
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}
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this.extract = function(entry, outPath, callback) {
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var entryName = entry || '';
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if (typeof entry === 'string') {
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entry = this.entry(entry);
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if (entry) {
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entryName = entry.name;
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} else {
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if (entryName.length && entryName[entryName.length - 1] !== '/')
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entryName += '/';
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}
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}
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if (!entry || entry.isDirectory) {
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var files = [], dirs = [], allDirs = {};
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for (var e in entries) {
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if (Object.prototype.hasOwnProperty.call(entries, e) && e.lastIndexOf(entryName, 0) === 0) {
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var relPath = e.replace(entryName, '');
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var childEntry = entries[e];
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if (childEntry.isFile) {
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files.push(childEntry);
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relPath = path.dirname(relPath);
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}
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if (relPath && !allDirs[relPath] && relPath[0] !== '.') {
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allDirs[relPath] = true;
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var parts = relPath.split('/').filter(function (f) { return f; });
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if (parts.length)
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dirs.push(parts);
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}
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}
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}
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dirs.sort(function(x, y) { return x.length - y.length; });
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if (dirs.length) {
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createDirectories(outPath, dirs, function (err) {
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if (err)
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callback(err);
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else
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extractFiles(outPath, entryName, files, callback, 0);
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});
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} else {
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extractFiles(outPath, entryName, files, callback, 0);
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}
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} else {
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fs.stat(outPath, function(err, stat) {
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if (stat && stat.isDirectory())
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extract(entry, path.join(outPath, path.basename(entry.name)), callback);
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else
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extract(entry, outPath, callback);
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});
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}
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};
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this.close = function() {
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if (fd) {
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fs.close(fd, function() {
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fd = null;
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});
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}
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};
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};
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|
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util.inherits(StreamZip, events.EventEmitter);
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|
|
// endregion
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|
|
// region CentralDirectoryHeader
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|
|
|
var CentralDirectoryHeader = function() {
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};
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|
|
|
CentralDirectoryHeader.prototype.read = function(data) {
|
|
if (data.length != consts.ENDHDR || data.readUInt32LE(0) != consts.ENDSIG)
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throw 'Invalid central directoty';
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|
// number of entries on this volume
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|
this.volumeEntries = data.readUInt16LE(consts.ENDSUB);
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|
// total number of entries
|
|
this.totalEntries = data.readUInt16LE(consts.ENDTOT);
|
|
// central directory size in bytes
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|
this.size = data.readUInt32LE(consts.ENDSIZ);
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|
// offset of first CEN header
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|
this.offset = data.readUInt32LE(consts.ENDOFF);
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|
// zip file comment length
|
|
this.commentLength = data.readUInt16LE(consts.ENDCOM);
|
|
};
|
|
|
|
// endregion
|
|
|
|
// region ZipEntry
|
|
|
|
var ZipEntry = function() {
|
|
};
|
|
|
|
ZipEntry.prototype.readHeader = function(data, offset) {
|
|
// data should be 46 bytes and start with "PK 01 02"
|
|
if (data.length < offset + consts.CENHDR || data.readUInt32LE(offset) != consts.CENSIG) {
|
|
throw 'Invalid entry header';
|
|
}
|
|
// version made by
|
|
this.verMade = data.readUInt16LE(offset + consts.CENVEM);
|
|
// version needed to extract
|
|
this.version = data.readUInt16LE(offset + consts.CENVER);
|
|
// encrypt, decrypt flags
|
|
this.flags = data.readUInt16LE(offset + consts.CENFLG);
|
|
// compression method
|
|
this.method = data.readUInt16LE(offset + consts.CENHOW);
|
|
// modification time (2 bytes time, 2 bytes date)
|
|
this.time = data.readUInt32LE(offset + consts.CENTIM);
|
|
// uncompressed file crc-32 value
|
|
this.crc = data.readUInt32LE(offset + consts.CENCRC);
|
|
// compressed size
|
|
this.compressedSize = data.readUInt32LE(offset + consts.CENSIZ);
|
|
// uncompressed size
|
|
this.size = data.readUInt32LE(offset + consts.CENLEN);
|
|
// filename length
|
|
this.fnameLen = data.readUInt16LE(offset + consts.CENNAM);
|
|
// extra field length
|
|
this.extraLen = data.readUInt16LE(offset + consts.CENEXT);
|
|
// file comment length
|
|
this.comLen = data.readUInt16LE(offset + consts.CENCOM);
|
|
// volume number start
|
|
this.diskStart = data.readUInt16LE(offset + consts.CENDSK);
|
|
// internal file attributes
|
|
this.inattr = data.readUInt16LE(offset + consts.CENATT);
|
|
// external file attributes
|
|
this.attr = data.readUInt32LE(offset + consts.CENATX);
|
|
// LOC header offset
|
|
this.offset = data.readUInt32LE(offset + consts.CENOFF);
|
|
};
|
|
|
|
ZipEntry.prototype.readDataHeader = function(data) {
|
|
// 30 bytes and should start with "PK\003\004"
|
|
if (data.readUInt32LE(0) != consts.LOCSIG) {
|
|
throw 'Invalid local header';
|
|
}
|
|
// version needed to extract
|
|
this.version = data.readUInt16LE(consts.LOCVER);
|
|
// general purpose bit flag
|
|
this.flags = data.readUInt16LE(consts.LOCFLG);
|
|
// compression method
|
|
this.method = data.readUInt16LE(consts.LOCHOW);
|
|
// modification time (2 bytes time ; 2 bytes date)
|
|
this.time = data.readUInt32LE(consts.LOCTIM);
|
|
// uncompressed file crc-32 value
|
|
this.crc = data.readUInt32LE(consts.LOCCRC) || this.crc;
|
|
// compressed size
|
|
this.compressedSize = data.readUInt32LE(consts.LOCSIZ) || this.compressedSize;
|
|
// uncompressed size
|
|
this.size = data.readUInt32LE(consts.LOCLEN) || this.size;
|
|
// filename length
|
|
this.fnameLen = data.readUInt16LE(consts.LOCNAM);
|
|
// extra field length
|
|
this.extraLen = data.readUInt16LE(consts.LOCEXT);
|
|
};
|
|
|
|
ZipEntry.prototype.read = function(data, offset) {
|
|
this.name = data.slice(offset, offset += this.fnameLen).toString();
|
|
var lastChar = data[offset - 1];
|
|
this.isDirectory = (lastChar == 47) || (lastChar == 92);
|
|
|
|
if (this.extraLen) {
|
|
this.readExtra(data, offset);
|
|
offset += this.extraLen;
|
|
}
|
|
this.comment = this.comLen ? data.slice(offset, offset + this.comLen).toString() : null;
|
|
};
|
|
|
|
ZipEntry.prototype.readExtra = function(data, offset) {
|
|
var signature, size, maxPos = offset + this.extraLen;
|
|
while (offset < maxPos) {
|
|
signature = data.readUInt16LE(offset);
|
|
offset += 2;
|
|
size = data.readUInt16LE(offset);
|
|
offset += 2;
|
|
if (consts.ID_ZIP64 === signature) {
|
|
this.parseZip64Extra(data, offset, size);
|
|
}
|
|
offset += size;
|
|
}
|
|
};
|
|
|
|
ZipEntry.prototype.parseZip64Extra = function(data, offset, length) {
|
|
if (length >= consts.EF_ZIP64_SCOMP && this.size === consts.EF_ZIP64_OR_32)
|
|
this.size = this.readUInt64LE(data, offset + consts.EF_ZIP64_SUNCOMP);
|
|
if (length >= consts.EF_ZIP64_RHO && this.compressedSize === consts.EF_ZIP64_OR_32)
|
|
this.compressedSize = this.readUInt64LE(data, offset + consts.EF_ZIP64_SCOMP);
|
|
if (length >= consts.EF_ZIP64_DSN && this.offset === consts.EF_ZIP64_OR_32)
|
|
this.offset = this.readUInt64LE(data, offset + consts.EF_ZIP64_RHO);
|
|
if (length >= consts.EF_ZIP64_DSN + 4 && this.diskStart === consts.EF_ZIP64_OR_16)
|
|
this.diskStart = data.readUInt32LE(consts.EF_ZIP64_DSN);
|
|
};
|
|
|
|
ZipEntry.prototype.readUInt64LE = function(buffer, offset) {
|
|
return (buffer.readUInt32LE(offset + 4) << 4) + buffer.readUInt32LE(offset);
|
|
};
|
|
|
|
Object.defineProperty(ZipEntry.prototype, 'encrypted', {
|
|
get: function() { return (this.flags & consts.FLG_ENTRY_ENC) == consts.FLG_ENTRY_ENC; }
|
|
});
|
|
|
|
Object.defineProperty(ZipEntry.prototype, 'isFile', {
|
|
get: function() { return !this.isDirectory; }
|
|
});
|
|
|
|
// endregion
|
|
|
|
// region FsRead
|
|
|
|
var FsRead = function(fd, buffer, offset, length, position, callback) {
|
|
this.fd = fd;
|
|
this.buffer = buffer;
|
|
this.offset = offset;
|
|
this.length = length;
|
|
this.position = position;
|
|
this.callback = callback;
|
|
this.bytesRead = 0;
|
|
this.waiting = false;
|
|
};
|
|
|
|
FsRead.prototype.read = function(sync) {
|
|
//console.log('read', this.position, this.bytesRead, this.length, this.offset);
|
|
this.waiting = true;
|
|
if (sync) {
|
|
try {
|
|
var bytesRead = fs.readSync(this.fd, this.buffer, this.offset + this.bytesRead,
|
|
this.length - this.bytesRead, this.position + this.bytesRead);
|
|
this.readCallback(sync, null, bytesRead);
|
|
} catch (err) {
|
|
this.readCallback(sync, err, null);
|
|
}
|
|
} else {
|
|
fs.read(this.fd, this.buffer, this.offset + this.bytesRead,
|
|
this.length - this.bytesRead, this.position + this.bytesRead,
|
|
this.readCallback.bind(this, sync));
|
|
}
|
|
};
|
|
|
|
FsRead.prototype.readCallback = function(sync, err, bytesRead) {
|
|
if (typeof bytesRead === 'number')
|
|
this.bytesRead += bytesRead;
|
|
if (err || !bytesRead || this.bytesRead === this.length) {
|
|
this.waiting = false;
|
|
return this.callback(err, this.bytesRead);
|
|
} else {
|
|
this.read(sync);
|
|
}
|
|
};
|
|
|
|
// endregion
|
|
|
|
// region FileWindowBuffer
|
|
|
|
var FileWindowBuffer = function(fd) {
|
|
this.position = 0;
|
|
this.buffer = new Buffer(0);
|
|
|
|
var fsOp = null;
|
|
|
|
this.checkOp = function() {
|
|
if (fsOp && fsOp.waiting)
|
|
throw 'Operation in progress';
|
|
};
|
|
|
|
this.read = function(pos, length, callback) {
|
|
this.checkOp();
|
|
if (this.buffer.length < length)
|
|
this.buffer = new Buffer(length);
|
|
this.position = pos;
|
|
fsOp = new FsRead(fd, this.buffer, 0, length, this.position, callback).read();
|
|
};
|
|
|
|
this.expandLeft = function(length, callback) {
|
|
this.checkOp();
|
|
this.buffer = Buffer.concat([new Buffer(length), this.buffer]);
|
|
this.position -= length;
|
|
if (this.position < 0)
|
|
this.position = 0;
|
|
fsOp = new FsRead(fd, this.buffer, 0, length, this.position, callback).read();
|
|
};
|
|
|
|
this.expandRight = function(length, callback) {
|
|
this.checkOp();
|
|
var offset = this.buffer.length;
|
|
this.buffer = Buffer.concat([this.buffer, new Buffer(length)]);
|
|
fsOp = new FsRead(fd, this.buffer, offset, length, this.position + offset, callback).read();
|
|
};
|
|
|
|
this.moveRight = function(length, callback, shift) {
|
|
this.checkOp();
|
|
if (shift) {
|
|
this.buffer.copy(this.buffer, 0, shift);
|
|
} else {
|
|
shift = 0;
|
|
}
|
|
this.position += shift;
|
|
fsOp = new FsRead(fd, this.buffer, this.buffer.length - shift, shift, this.position + this.buffer.length - shift, callback).read();
|
|
};
|
|
};
|
|
|
|
// endregion
|
|
|
|
// region EntryDataReaderStream
|
|
|
|
var EntryDataReaderStream = function(fd, offset, length) {
|
|
stream.Readable.prototype.constructor.call(this);
|
|
this.fd = fd;
|
|
this.offset = offset;
|
|
this.length = length;
|
|
this.pos = 0;
|
|
this.readCallback = this.readCallback.bind(this);
|
|
};
|
|
|
|
util.inherits(EntryDataReaderStream, stream.Readable);
|
|
|
|
EntryDataReaderStream.prototype._read = function(n) {
|
|
var buffer = new Buffer(Math.min(n, this.length - this.pos));
|
|
if (buffer.length) {
|
|
fs.read(this.fd, buffer, 0, buffer.length, this.offset + this.pos, this.readCallback);
|
|
} else {
|
|
this.push(null);
|
|
}
|
|
};
|
|
|
|
EntryDataReaderStream.prototype.readCallback = function(err, bytesRead, buffer) {
|
|
this.pos += bytesRead;
|
|
if (err) {
|
|
this.emit('error', err);
|
|
this.push(null);
|
|
} else if (!bytesRead) {
|
|
this.push(null);
|
|
} else {
|
|
if (bytesRead !== buffer.length)
|
|
buffer = buffer.slice(0, bytesRead);
|
|
this.push(buffer);
|
|
}
|
|
};
|
|
|
|
// endregion
|
|
|
|
// region EntryVerifyStream
|
|
|
|
var EntryVerifyStream = function(baseStm, crc, size) {
|
|
stream.Transform.prototype.constructor.call(this);
|
|
this.verify = new CrcVerify(crc, size);
|
|
var that = this;
|
|
baseStm.on('error', function(e) {
|
|
that.emit('error', e);
|
|
});
|
|
};
|
|
|
|
util.inherits(EntryVerifyStream, stream.Transform);
|
|
|
|
EntryVerifyStream.prototype._transform = function(data, encoding, callback) {
|
|
try {
|
|
this.verify.data(data);
|
|
callback(null, data);
|
|
} catch (err) {
|
|
callback(err, data);
|
|
}
|
|
};
|
|
|
|
// endregion
|
|
|
|
// region CrcVerify
|
|
|
|
var CrcVerify = function(crc, size) {
|
|
this.crc = crc;
|
|
this.size = size;
|
|
this.state = {
|
|
crc: ~0,
|
|
size: 0
|
|
};
|
|
};
|
|
|
|
CrcVerify.prototype.data = function(data) {
|
|
var crcTable = CrcVerify.getCrcTable();
|
|
var crc = this.state.crc, off = 0, len = data.length;
|
|
while (--len >= 0)
|
|
crc = crcTable[(crc ^ data[off++]) & 0xff] ^ (crc >>> 8);
|
|
this.state.crc = crc;
|
|
this.state.size += data.length;
|
|
if (this.state.size >= this.size) {
|
|
var buf = new Buffer(4);
|
|
buf.writeInt32LE(~this.state.crc & 0xffffffff, 0);
|
|
crc = buf.readUInt32LE(0);
|
|
if (crc !== this.crc)
|
|
throw 'Invalid CRC';
|
|
if (this.state.size !== this.size)
|
|
throw 'Invalid size';
|
|
}
|
|
};
|
|
|
|
CrcVerify.getCrcTable = function() {
|
|
var crcTable = CrcVerify.crcTable;
|
|
if (!crcTable) {
|
|
CrcVerify.crcTable = crcTable = [];
|
|
var b = new Buffer(4);
|
|
for (var n = 0; n < 256; n++) {
|
|
var c = n;
|
|
for (var k = 8; --k >= 0; )
|
|
if ((c & 1) != 0) { c = 0xedb88320 ^ (c >>> 1); } else { c = c >>> 1; }
|
|
if (c < 0) {
|
|
b.writeInt32LE(c, 0);
|
|
c = b.readUInt32LE(0);
|
|
}
|
|
crcTable[n] = c;
|
|
}
|
|
}
|
|
return crcTable;
|
|
};
|
|
|
|
// endregion
|
|
|
|
// region exports
|
|
|
|
module.exports = StreamZip;
|
|
|
|
// endregion
|