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https://github.com/janeczku/calibre-web
synced 2024-11-24 18:47:23 +00:00
Code cosmetics unrar
This commit is contained in:
OzzieIsaacs
parent
d2ea10e90e
commit
7dac87fa5d
@ -160,7 +160,7 @@ var RarVolumeHeader = function(bstream) {
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// read in filename
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this.filename = bstream.readBytes(this.nameSize);
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var _s = ""
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var _s = "";
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for (var _i = 0; _i < this.filename.length ; _i++) {
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_s += String.fromCharCode(this.filename[_i]);
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}
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@ -313,7 +313,7 @@ function RarReadTables(bstream) {
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//console.log(DecodeLen, DecodePos, DecodeNum);
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for (i = 0; i < TableSize;) {
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var N;
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var num = RarDecodeNumber(bstream, BD);
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var num = rarDecodeNumber(bstream, BD);
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if (num < 16) {
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Table[i] = (num + UnpOldTable[i]) & 0xf;
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i++;
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@ -345,7 +345,7 @@ function RarReadTables(bstream) {
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}
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function RarDecodeNumber(bstream, dec) {
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function rarDecodeNumber(bstream, dec) {
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var DecodeLen = dec.DecodeLen, DecodePos = dec.DecodePos, DecodeNum = dec.DecodeNum;
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var bitField = bstream.getBits() & 0xfffe;
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//some sort of rolled out binary search
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@ -365,7 +365,7 @@ function RarDecodeNumber(bstream, dec) {
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((bitField < DecodeLen[13]) ? 13 : 14)
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: 15));
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bstream.readBits(bits);
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var N = DecodePos[bits] + ((bitField - DecodeLen[bits -1]) >>> (16 - bits));
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var N = DecodePos[bits] + ((bitField - DecodeLen[bits - 1]) >>> (16 - bits));
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return DecodeNum[N];
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}
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@ -373,46 +373,56 @@ function RarDecodeNumber(bstream, dec) {
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function rarMakeDecodeTables(BitLength, offset, dec, size) {
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var DecodeLen = dec.DecodeLen, DecodePos = dec.DecodePos, DecodeNum = dec.DecodeNum;
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var LenCount = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
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TmpPos = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
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var LenCount = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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TmpPos = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
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N = 0, M = 0;
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for (var i = DecodeNum.length; i--;) DecodeNum[i] = 0;
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for (var i = 0; i < size; i++) {
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var i;
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for (i = DecodeNum.length; i--;) DecodeNum[i] = 0;
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for (i = 0; i < size; i++) {
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LenCount[BitLength[i + offset] & 0xF]++;
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}
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LenCount[0] = 0;
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TmpPos[0] = 0;
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DecodePos[0] = 0;
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DecodeLen[0] = 0;
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for (var I = 1; I < 16; ++I) {
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var I;
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for (I = 1; I < 16; ++I) {
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N = 2 * (N + LenCount[I]);
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M = (N << (15-I));
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if (M > 0xFFFF)
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M = (N << (15 - I));
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if (M > 0xFFFF){
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M = 0xFFFF;
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}
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DecodeLen[I] = M;
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DecodePos[I] = DecodePos[I-1] + LenCount[I-1];
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DecodePos[I] = DecodePos[I - 1] + LenCount[I - 1];
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TmpPos[I] = DecodePos[I];
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}
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for (I = 0; I < size; ++I) {
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if (BitLength[I + offset] != 0) {
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if (BitLength[I + offset] !== 0) {
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DecodeNum[ TmpPos[ BitLength[offset + I] & 0xF ]++] = I;
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}
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}
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}
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// TODO: implement
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function Unpack15(bstream, Solid) {
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function Unpack15() { //bstream, Solid) {
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info("ERROR! RAR 1.5 compression not supported");
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}
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function Unpack20(bstream, Solid) {
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var lowDistRepCount = 0, prevLowDist = 0;
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var rOldDist = [0, 0, 0, 0];
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var lastDist = 0;
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var lastLength = 0;
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function Unpack20(bstream) { //, Solid) {
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var destUnpSize = rBuffer.data.length;
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var oldDistPtr = 0;
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RarReadTables20(bstream);
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rarReadTables20(bstream);
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while (destUnpSize > rBuffer.ptr) {
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var num = RarDecodeNumber(bstream, LD);
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var num = rarDecodeNumber(bstream, LD);
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var Bits;
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if (num < 256) {
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rBuffer.insertByte(num);
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continue;
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@ -422,35 +432,35 @@ function Unpack20(bstream, Solid) {
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if ((Bits = rLBits[num]) > 0) {
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Length += bstream.readBits(Bits);
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}
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var DistNumber = RarDecodeNumber(bstream, DD);
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var DistNumber = rarDecodeNumber(bstream, DD);
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var Distance = rDDecode[DistNumber] + 1;
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if ((Bits = rDBits[DistNumber]) > 0) {
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Distance += bstream.readBits(Bits);
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}
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if (Distance >= 0x2000) {
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Length++;
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if(Distance >= 0x40000) Length++;
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if (Distance >= 0x40000) Length++;
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}
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lastLength = Length;
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lastDist = rOldDist[oldDistPtr++ & 3] = Distance;
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RarCopyString(Length, Distance);
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rarCopyString(Length, Distance);
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continue;
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}
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if (num === 269) {
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RarReadTables20(bstream);
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rarReadTables20(bstream);
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RarUpdateProgress()
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rarUpdateProgress();
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continue;
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}
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if (num === 256) {
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lastDist = rOldDist[oldDistPtr++ & 3] = lastDist;
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RarCopyString(lastLength, lastDist);
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rarCopyString(lastLength, lastDist);
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continue;
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}
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if (num < 261) {
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var Distance = rOldDist[(oldDistPtr - (num - 256)) & 3];
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var LengthNumber = RarDecodeNumber(bstream, RD);
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var LengthNumber = rarDecodeNumber(bstream, RD);
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var Length = rLDecode[LengthNumber] +2;
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if ((Bits = rLBits[LengthNumber]) > 0) {
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Length += bstream.readBits(Bits);
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@ -464,7 +474,7 @@ function Unpack20(bstream, Solid) {
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}
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lastLength = Length;
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lastDist = rOldDist[oldDistPtr++ & 3] = Distance;
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RarCopyString(Length, Distance);
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rarCopyString(Length, Distance);
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continue;
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}
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if (num < 270) {
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@ -474,14 +484,14 @@ function Unpack20(bstream, Solid) {
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}
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lastLength = 2;
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lastDist = rOldDist[oldDistPtr++ & 3] = Distance;
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RarCopyString(2, Distance);
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rarCopyString(2, Distance);
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continue;
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}
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}
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RarUpdateProgress()
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rarUpdateProgress()
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}
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function RarUpdateProgress() {
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function rarUpdateProgress() {
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var change = rBuffer.ptr - currentBytesUnarchivedInFile;
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currentBytesUnarchivedInFile = rBuffer.ptr;
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currentBytesUnarchived += change;
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@ -497,7 +507,7 @@ var rNC20 = 298,
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var UnpOldTable20 = new Array(rMC20 * 4);
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function RarReadTables20(bstream) {
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function rarReadTables20(bstream) {
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var BitLength = new Array(rBC20);
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var Table = new Array(rMC20 * 4);
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var TableSize, N, I;
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@ -510,7 +520,7 @@ function RarReadTables20(bstream) {
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rarMakeDecodeTables(BitLength, 0, BD, rBC20);
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I = 0;
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while (I < TableSize) {
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var num = RarDecodeNumber(bstream, BD);
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var num = rarDecodeNumber(bstream, BD);
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if (num < 16) {
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Table[I] = num + UnpOldTable20[I] & 0xf;
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I++;
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@ -537,12 +547,6 @@ function RarReadTables20(bstream) {
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for (var i = UnpOldTable20.length; i--;) UnpOldTable20[i] = Table[i];
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}
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var lowDistRepCount = 0, prevLowDist = 0;
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var rOldDist = [0,0,0,0];
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var lastDist;
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var lastLength;
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function Unpack29(bstream, Solid) {
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// lazy initialize rDDecode and rDBits
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@ -562,7 +566,7 @@ function Unpack29(bstream, Solid) {
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var Bits;
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//tablesRead = false;
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rOldDist = [0,0,0,0]
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rOldDist = [0, 0, 0, 0]
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lastDist = 0;
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lastLength = 0;
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@ -573,7 +577,7 @@ function Unpack29(bstream, Solid) {
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RarReadTables(bstream);
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while (true) {
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var num = RarDecodeNumber(bstream, LD);
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var num = rarDecodeNumber(bstream, LD);
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if (num < 256) {
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rBuffer.insertByte(num);
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@ -584,7 +588,7 @@ function Unpack29(bstream, Solid) {
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if ((Bits = rLBits[num]) > 0) {
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Length += bstream.readBits(Bits);
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}
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var DistNumber = RarDecodeNumber(bstream, DD);
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var DistNumber = rarDecodeNumber(bstream, DD);
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var Distance = DDecode[DistNumber]+1;
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if ((Bits = DBits[DistNumber]) > 0) {
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if (DistNumber > 9) {
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@ -597,7 +601,7 @@ function Unpack29(bstream, Solid) {
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lowDistRepCount--;
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Distance += prevLowDist;
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} else {
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var LowDist = RarDecodeNumber(bstream, LDD);
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var LowDist = rarDecodeNumber(bstream, LDD);
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if (LowDist === 16) {
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lowDistRepCount = rLowDistRepCount - 1;
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Distance += prevLowDist;
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@ -618,7 +622,7 @@ function Unpack29(bstream, Solid) {
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}
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RarInsertOldDist(Distance);
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RarInsertLastMatch(Length, Distance);
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RarCopyString(Length, Distance);
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rarCopyString(Length, Distance);
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continue;
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}
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if (num === 256) {
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@ -632,7 +636,7 @@ function Unpack29(bstream, Solid) {
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}
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if (num === 258) {
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if (lastLength != 0) {
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RarCopyString(lastLength, lastDist);
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rarCopyString(lastLength, lastDist);
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}
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continue;
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}
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@ -645,13 +649,13 @@ function Unpack29(bstream, Solid) {
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}
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rOldDist[0] = Distance;
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var LengthNumber = RarDecodeNumber(bstream, RD);
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var LengthNumber = rarDecodeNumber(bstream, RD);
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var Length = rLDecode[LengthNumber] + 2;
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if ((Bits = rLBits[LengthNumber]) > 0) {
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Length += bstream.readBits(Bits);
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}
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RarInsertLastMatch(Length, Distance);
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RarCopyString(Length, Distance);
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rarCopyString(Length, Distance);
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continue;
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}
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if (num < 272) {
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@ -661,16 +665,16 @@ function Unpack29(bstream, Solid) {
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}
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RarInsertOldDist(Distance);
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RarInsertLastMatch(2, Distance);
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RarCopyString(2, Distance);
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rarCopyString(2, Distance);
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continue;
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}
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}
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RarUpdateProgress()
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rarUpdateProgress()
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}
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function RarReadEndOfBlock(bstream) {
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RarUpdateProgress()
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rarUpdateProgress()
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var NewTable = false, NewFile = false;
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if (bstream.readBits(1)) {
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@ -719,7 +723,7 @@ function RarInsertOldDist(distance) {
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}
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//this is the real function, the other one is for debugging
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function RarCopyString(length, distance) {
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function rarCopyString(length, distance) {
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var destPtr = rBuffer.ptr - distance;
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if(destPtr < 0){
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var l = rOldBuffers.length;
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@ -751,11 +755,11 @@ function unpack(v) {
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switch(Ver) {
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case 15: // rar 1.5 compression
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Unpack15(bstream, Solid);
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Unpack15(); //(bstream, Solid);
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break;
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case 20: // rar 2.x compression
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case 26: // files larger than 2GB
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Unpack20(bstream, Solid);
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Unpack20(bstream); //, Solid);
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break;
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case 29: // rar 3.x compression
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case 36: // alternative hash
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@ -520,7 +520,7 @@ function inflate(compressedData, numDecompressedBytes) {
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if (bType === 0) {
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// skip remaining bits in this byte
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while (bstream.bitPtr !== 0) bstream.readBits(1);
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var len = bstream.readBits(16),
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var len = bstream.readBits(16);
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// nlen = bstream.readBits(16);
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// TODO: check if nlen is the ones-complement of len?
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