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Reader.hx
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Reader.hx
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/*
* Copyright (C)2005-2019 Haxe Foundation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package haxe.zip;
import haxe.zip.Entry;
import haxe.ds.List;
// see http://www.pkware.com/documents/casestudies/APPNOTE.TXT
class Reader {
var i : haxe.io.Input;
public function new(i) {
this.i = i;
}
function readZipDate() {
var t = i.readUInt16();
var hour = (t >> 11) & 31;
var min = (t >> 5) & 63;
var sec = t & 31;
var d = i.readUInt16();
var year = d >> 9;
var month = (d >> 5) & 15;
var day = d & 31;
return new Date(year + 1980, month-1, day, hour, min, sec << 1);
}
function readExtraFields(length) {
var fields = new List();
while( length > 0 ) {
if( length < 4 ) throw "Invalid extra fields data";
var tag = i.readUInt16();
var len = i.readUInt16();
if( length < len ) throw "Invalid extra fields data";
switch( tag ) {
case 0x7075:
var version = i.readByte();
if( version != 1 ) {
var data = new haxe.io.BytesBuffer();
data.addByte(version);
data.add(i.read(len-1));
fields.add(FUnknown(tag,data.getBytes()));
} else {
var crc = i.readInt32();
var name = i.read(len - 5).toString();
fields.add(FInfoZipUnicodePath(name,crc));
}
default:
fields.add(FUnknown(tag,i.read(len)));
}
length -= 4 + len;
}
return fields;
}
public function readEntryHeader() : Entry {
var i = this.i;
var h = i.readInt32();
if( h == 0x02014B50 || h == 0x06054B50 )
return null;
if( h != 0x04034B50 )
throw "Invalid Zip Data";
var version = i.readUInt16();
var flags = i.readUInt16();
var utf8 = flags & 0x800 != 0;
if( (flags & 0xF7F1) != 0 )
throw "Unsupported flags "+flags;
var compression = i.readUInt16();
var compressed = (compression != 0);
if( compressed && compression != 8 )
throw "Unsupported compression "+compression;
var mtime = readZipDate();
var crc32 : Null<Int> = i.readInt32();
var csize = i.readInt32();
var usize = i.readInt32();
var fnamelen = i.readInt16();
var elen = i.readInt16();
var fname = i.readString(fnamelen);
var fields = readExtraFields(elen);
if( utf8 )
fields.push(FUtf8);
var data = null;
// we have a data descriptor that store the real crc/sizes
// after the compressed data, let's wait for it
if( (flags & 8) != 0 )
crc32 = null;
return {
fileName : fname,
fileSize : usize,
fileTime : mtime,
compressed : compressed,
dataSize : csize,
data : data,
crc32 : crc32,
extraFields : fields,
};
}
public function read() : List<Entry> {
var l = new List();
var buf = null;
var tmp = null;
while( true ) {
var e = readEntryHeader();
if( e == null )
break;
// do we have a data descriptor? (see readEntryHeader)
if( e.crc32 == null ) {
if( e.compressed ) {
#if neko
// enter progressive mode : we use a different input which has
// a temporary buffer, this is necessary since we have to uncompress
// progressively, and after that we might have pending read data
// that needs to be processed
var bufSize = 65536;
if( buf == null ) {
buf = new haxe.io.BufferInput(i, haxe.io.Bytes.alloc(bufSize));
tmp = haxe.io.Bytes.alloc(bufSize);
i = buf;
}
var out = new haxe.io.BytesBuffer();
var z = new neko.zip.Uncompress(-15);
z.setFlushMode(neko.zip.Flush.SYNC);
while( true ) {
if( buf.available == 0 )
buf.refill();
var p = bufSize - buf.available;
if( p != buf.pos ) {
// because of lack of "srcLen" in zip api, we need to always be stuck to the buffer end
buf.buf.blit(p, buf.buf, buf.pos, buf.available);
buf.pos = p;
}
var r = z.execute(buf.buf, buf.pos, tmp, 0);
out.addBytes(tmp, 0, r.write);
buf.pos += r.read;
buf.available -= r.read;
if( r.done ) break;
}
e.data = out.getBytes();
#else
var bufSize = 65536;
if( tmp == null )
tmp = haxe.io.Bytes.alloc(bufSize);
var out = new haxe.io.BytesBuffer();
var z = new InflateImpl(i, false, false);
while( true ) {
var n = z.readBytes(tmp, 0, bufSize);
out.addBytes(tmp, 0, n);
if( n < bufSize )
break;
}
e.data = out.getBytes();
#end
} else
e.data = i.read(e.dataSize);
e.crc32 = i.readInt32();
if( e.crc32 == 0x08074b50 )
e.crc32 = i.readInt32();
e.dataSize = i.readInt32();
e.fileSize = i.readInt32();
// set data to uncompressed
e.dataSize = e.fileSize;
e.compressed = false;
} else
e.data = i.read(e.dataSize);
l.add(e);
}
return l;
}
public static function readZip( i : haxe.io.Input ) {
var r = new Reader(i);
return r.read();
}
public static function unzip( f : Entry ) {
if( !f.compressed )
return f.data;
var c = new haxe.zip.Uncompress(-15);
var s = haxe.io.Bytes.alloc(f.fileSize);
var r = c.execute(f.data,0,s,0);
c.close();
if( !r.done || r.read != f.data.length || r.write != f.fileSize )
throw "Invalid compressed data for "+f.fileName;
f.compressed = false;
f.dataSize = f.fileSize;
f.data = s;
return f.data;
}
}