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Code Issues Releases Wiki Activity

Updated 'compressed-stream' to be more configurable

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Added zip-writer coapability
updated zip-reader to show logs when enabled
This commit is contained in:
Bryan Roe
2020-06-17 17:02:09 -07:00
parent 6adbbd8897
commit ad5e6c4dc3
4 changed files with 394 additions and 12 deletions
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78
modules/zip-reader.js
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@@ -233,7 +233,37 @@ function zippedObject(table)
extractNext(ret);
return (ret);
}
};
this._readLocalHeaderSink = function _readLocalHeaderSink(err, bytesRead, buffer)
{
var info = _readLocalHeaderSink.info;
console.info1('Local File Record -> ');
var filenameLength = buffer.readUInt32LE(26);
console.info1(' General Purpose Flag: ' + buffer.readUInt16LE(6));
console.info1(' CRC-32 of uncompressed data: ' + buffer.readUInt32LE(14));
console.info1(' Compression Method: ' + buffer.readUInt16LE(8));
console.info1(' Compressed Size: ' + buffer.readUInt32LE(18));
console.info1(' Uncompressed Size: ' + buffer.readUInt32LE(22));
console.info1(' Last Modification Time: ' + buffer.readUInt16LE(10));
console.info1(' Last Modification Date: ' + buffer.readUInt16LE(12));
console.info1(' Extra Field Length: ' + buffer.readUInt16LE(28));
require('fs').read(info.fd, { buffer: Buffer.alloc(filenameLength) }, function (e, b, f)
{
console.info1(' File Name: ' + f.toString());
require('fs').read(info.fd, { buffer: Buffer.alloc(10) }, function (e2, b2, f2)
{
console.info1(' Compressed Data Sample: ' + f2.toString('hex'));
});
});
};
this._readLocalHeaderSink.self = this;
this.readLocalHeader = function readLocalHeader(name)
{
var info = this._table[name];
this._readLocalHeaderSink.info = info;
require('fs').read(info.fd, { buffer: Buffer.alloc(30), position: info.offset }, this._readLocalHeaderSink);
};
}
function read(path)
@@ -244,6 +274,19 @@ function read(path)
ret._rej('File not found');
return (ret);
}
ret._tmp = {};
require('events').EventEmitter.call(ret._tmp);
ret._tmp.on('~', function () { if (this._fd) { require('fs').closeSync(this._fd); } });
ret.close = function close()
{
if (this._fd)
{
require('fs').closeSync(this._fd);
this._fd = null;
}
}
ret._len = require('fs').statSync(path).size;
ret._fd = require('fs').openSync(path, require('fs').constants.O_RDONLY);
ret._cdr = function _cdr(err, bytesRead, buffer)
@@ -257,7 +300,30 @@ function read(path)
var comLength = buffer.readUInt16LE(32);
var name = buffer.slice(46, 46 + nameLength).toString();
table[name] = { name: name, compressedSize: buffer.readUInt32LE(20), offset: buffer.readUInt32LE(42), fd: _cdr.self._fd, compression: buffer.readUInt16LE(10), crc: buffer.readUInt32LE(16) };
console.info1('Central Directory Record:');
console.info1(' Version: ' + buffer.readUInt16LE(4));
console.info1(' Minimum: ' + buffer.readUInt16LE(6));
console.info1(' Name: ' + name);
console.info1(' CRC-32 of Uncompressed data: ' + buffer.readUInt32LE(16));
console.info1(' Uncompressed Size: ' + buffer.readUInt32LE(24));
console.info1(' Compressed Size: ' + buffer.readUInt32LE(20));
console.info1(' File Last Modification Time: ' + buffer.readUInt16LE(12));
console.info1(' File Last Modification Date: ' + buffer.readUInt16LE(14));
console.info1(' Internal Attributes: ' + buffer.readUInt16LE(36));
console.info1(' External Attributes: ' + buffer.readUInt32LE(38));
console.info1(' Local Header at: ' + buffer.readUInt32LE(42));
table[name] =
{
name: name,
compressedSize: buffer.readUInt32LE(20),
uncompressedSize: buffer.readUInt32LE(24),
offset: buffer.readUInt32LE(42),
fd: _cdr.self._fd,
compression: buffer.readUInt16LE(10),
crc: buffer.readUInt32LE(16)
};
buffer = buffer.slice(46 + nameLength + efLength + comLength);
}
@@ -272,6 +338,14 @@ function read(path)
{
if ((record = buffer.slice(buffer.length - i)).readUInt32LE() == EOCDR)
{
console.info1('Found Start of ECD Record ' + i + ' bytes from end of file');
console.info1('-------------------------');
console.info1(' Disk #: ' + record.readUInt16LE(4));
console.info1(' Number of Central Directory Records on this disc: ' + record.readUInt16LE(8));
console.info1(' Total number of Central Directory Records: ' + record.readUInt16LE(10));
console.info1(' Size of Central Directory: ' + record.readUInt32LE(12) + ' bytes');
console.info1(' Central Directory Records should be at offset: ' + record.readUInt32LE(16));
require('fs').read(_eocdr.self._fd, { buffer: Buffer.alloc(record.readUInt32LE(12)), position: record.readUInt32LE(16) }, _eocdr.self._cdr);
break;
}