mirror of
https://github.com/gorhill/uBlock.git
synced 2024-09-22 21:57:47 +02:00
9f7e385a5c
Related commit:
- fb4e94f92c
A bidi-trie can't store strings longer than 255 characters
because the string segment lengths are encoded into a single
byte. This commit ensures only strings smaller than
256 characters are stored in the bidi-tries.
682 lines
24 KiB
JavaScript
682 lines
24 KiB
JavaScript
/*******************************************************************************
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uBlock Origin - a browser extension to block requests.
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Copyright (C) 2019-present Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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'use strict';
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// *****************************************************************************
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// start of local namespace
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{
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/*******************************************************************************
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A BidiTrieContainer is mostly a large buffer in which distinct but related
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tries are stored. The memory layout of the buffer is as follow:
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0-255: reserved
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256-259: offset to start of trie data section (=> trie0)
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260-263: offset to end of trie data section (=> trie1)
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264-267: offset to start of character data section (=> char0)
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268-271: offset to end of character data section (=> char1)
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272: start of trie data section
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+--------------+
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Normal cell: | And | If "Segment info" matches:
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(aka CELL) +--------------+ Goto "And"
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| Or | Else
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+--------------+ Goto "Or"
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| Segment info |
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+--------------+
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+--------------+
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Boundary cell: | Right And | "Right And" and/or "Left And"
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(aka BCELL) +--------------+ can be 0 in last-segment condition.
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| Left And |
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+--------------+
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| 0 |
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+--------------+
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Given following filters and assuming token is "ad" for all of them:
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-images/ad-
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/google_ad.
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/images_ad.
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_images/ad.
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We get the following internal representation:
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+-----------+ +-----------+ +---+
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| |---->| |---->| 0 |
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+-----------+ +-----------+ +---+ +-----------+
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| 0 | +--| | | |---->| 0 |
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+-----------+ | +-----------+ +---+ +-----------+
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| ad | | | - | | 0 | | 0 |
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+-----------+ | +-----------+ +---+ +-----------+
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| | -images/ |
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| +-----------+ +---+ +-----------+
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+->| |---->| 0 |
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+-----------+ +---+ +-----------+ +-----------+
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| 0 | | |---->| |---->| 0 |
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+-----------+ +---+ +-----------+ +-----------+
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| . | | 0 | +--| | +--| |
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+-----------+ +---+ | +-----------+ | +-----------+
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| | _ | | | /google |
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| +-----------+ | +-----------+
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| |
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| +->| 0 |
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| +-----------+
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| | 0 |
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| +-----------+
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| | /images |
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| +-----------+
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| +-----------+
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+->| 0 |
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+-----------+
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| 0 |
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+-----------+
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| _images/ |
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+-----------+
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*/
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const PAGE_SIZE = 65536;
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// i32 / i8
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const TRIE0_SLOT = 256 >>> 2; // 64 / 256
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const TRIE1_SLOT = TRIE0_SLOT + 1; // 65 / 260
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const CHAR0_SLOT = TRIE0_SLOT + 2; // 66 / 264
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const CHAR1_SLOT = TRIE0_SLOT + 3; // 67 / 268
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const TRIE0_START = TRIE0_SLOT + 4 << 2; // 272
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const CELL_BYTE_LENGTH = 12;
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const MIN_FREE_CELL_BYTE_LENGTH = CELL_BYTE_LENGTH * 4;
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const CELL_AND = 0;
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const CELL_OR = 1;
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const BCELL_RIGHT_AND = 0;
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const BCELL_LEFT_AND = 1;
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const SEGMENT_INFO = 2;
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µBlock.BidiTrieContainer = class {
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constructor(details) {
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if ( details instanceof Object === false ) { details = {}; }
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const len = (details.byteLength || 0) + PAGE_SIZE-1 & ~(PAGE_SIZE-1);
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this.buf = new Uint8Array(Math.max(len, 131072));
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this.buf32 = new Uint32Array(this.buf.buffer);
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this.buf32[TRIE0_SLOT] = TRIE0_START;
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this.buf32[TRIE1_SLOT] = this.buf32[TRIE0_SLOT];
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this.buf32[CHAR0_SLOT] = details.char0 || 65536;
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this.buf32[CHAR1_SLOT] = this.buf32[CHAR0_SLOT];
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}
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//--------------------------------------------------------------------------
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// Public methods
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//--------------------------------------------------------------------------
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reset() {
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this.buf32[TRIE1_SLOT] = this.buf32[TRIE0_SLOT];
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this.buf32[CHAR1_SLOT] = this.buf32[CHAR0_SLOT];
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}
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matches(iroot, a, i) {
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const buf32 = this.buf32;
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const buf8 = this.buf;
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const char0 = buf32[CHAR0_SLOT];
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const aR = a.length;
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let icell = iroot;
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let al = i;
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let c, v, bl, n;
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for (;;) {
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c = a.charCodeAt(al);
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al += 1;
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// find first segment with a first-character match
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for (;;) {
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v = buf32[icell+SEGMENT_INFO];
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bl = char0 + (v & 0x00FFFFFF);
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if ( buf8[bl] === c ) { break; }
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icell = buf32[icell+CELL_OR];
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if ( icell === 0 ) { return -1; }
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}
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// all characters in segment must match
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n = v >>> 24;
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if ( n > 1 ) {
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n -= 1;
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if ( (al + n) > aR ) { return -1; }
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bl += 1;
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for ( let i = 0; i < n; i++ ) {
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if ( a.charCodeAt(al+i) !== buf8[bl+i] ) { return -1; }
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}
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al += n;
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}
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// next segment
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icell = buf32[icell+CELL_AND];
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if ( /* icell === 0 || */ buf32[icell+SEGMENT_INFO] === 0 ) {
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const inext = buf32[icell+BCELL_LEFT_AND];
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if ( inext === 0 ) { return (i << 16) | al; }
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const r = this.matchesLeft(inext, a, i);
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if ( r !== -1 ) { return (r << 16) | al; }
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icell = buf32[icell+CELL_AND];
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if ( icell === 0 ) { return -1; }
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}
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if ( al === aR ) { return -1; }
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}
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}
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matchesLeft(iroot, a, i) {
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const buf32 = this.buf32;
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const buf8 = this.buf;
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const char0 = buf32[CHAR0_SLOT];
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let icell = iroot;
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let ar = i;
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let c, v, br, n;
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for (;;) {
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ar -= 1;
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c = a.charCodeAt(ar);
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// find first segment with a first-character match
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for (;;) {
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v = buf32[icell+SEGMENT_INFO];
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n = v >>> 24;
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br = char0 + (v & 0x00FFFFFF) + n - 1;
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if ( buf8[br] === c ) { break; }
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icell = buf32[icell+CELL_OR];
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if ( icell === 0 ) { return -1; }
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}
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// all characters in segment must match
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if ( n > 1 ) {
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n -= 1;
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if ( n > ar ) { return -1; }
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for ( let i = 1; i <= n; i++ ) {
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if ( a.charCodeAt(ar-i) !== buf8[br-i] ) { return -1; }
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}
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ar -= n;
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}
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// next segment
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icell = buf32[icell+CELL_AND];
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if ( icell === 0 || buf32[icell+SEGMENT_INFO] === 0 ) { return ar; }
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if ( ar === 0 ) { return -1; }
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}
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}
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createOne(args) {
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if ( Array.isArray(args) ) {
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return new this.STrieRef(this, args[0], args[1]);
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}
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// grow buffer if needed
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if ( (this.buf32[CHAR0_SLOT] - this.buf32[TRIE1_SLOT]) < CELL_BYTE_LENGTH ) {
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this.growBuf(CELL_BYTE_LENGTH, 0);
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}
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const iroot = this.buf32[TRIE1_SLOT] >>> 2;
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this.buf32[TRIE1_SLOT] += CELL_BYTE_LENGTH;
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this.buf32[iroot+CELL_OR] = 0;
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this.buf32[iroot+CELL_AND] = 0;
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this.buf32[iroot+SEGMENT_INFO] = 0;
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return new this.STrieRef(this, iroot, 0);
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}
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compileOne(trieRef) {
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return [ trieRef.iroot, trieRef.size ];
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}
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add(iroot, a, i = 0) {
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const aR = a.length;
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if ( aR === 0 ) { return 0; }
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// grow buffer if needed
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if (
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(this.buf32[CHAR0_SLOT] - this.buf32[TRIE1_SLOT]) < MIN_FREE_CELL_BYTE_LENGTH ||
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(this.buf.length - this.buf32[CHAR1_SLOT]) < 256
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) {
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this.growBuf(MIN_FREE_CELL_BYTE_LENGTH, 256);
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}
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const buf32 = this.buf32;
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let icell = iroot;
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// special case: first node in trie
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if ( buf32[icell+SEGMENT_INFO] === 0 ) {
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buf32[icell+SEGMENT_INFO] = this.addSegment(a, i, aR);
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return this.addLeft(icell, a, i);
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}
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const buf8 = this.buf;
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const char0 = buf32[CHAR0_SLOT];
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let al = i;
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let inext;
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// find a matching cell: move down
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for (;;) {
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const binfo = buf32[icell+SEGMENT_INFO];
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// skip boundary cells
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if ( binfo === 0 ) {
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icell = buf32[icell+BCELL_RIGHT_AND];
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continue;
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}
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let bl = char0 + (binfo & 0x00FFFFFF);
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// if first character is no match, move to next descendant
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if ( buf8[bl] !== a.charCodeAt(al) ) {
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inext = buf32[icell+CELL_OR];
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if ( inext === 0 ) {
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inext = this.addCell(0, 0, this.addSegment(a, al, aR));
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buf32[icell+CELL_OR] = inext;
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return this.addLeft(inext, a, i);
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}
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icell = inext;
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continue;
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}
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// 1st character was tested
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let bi = 1;
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al += 1;
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// find 1st mismatch in rest of segment
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const bR = binfo >>> 24;
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if ( bR !== 1 ) {
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for (;;) {
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if ( bi === bR ) { break; }
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if ( al === aR ) { break; }
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if ( buf8[bl+bi] !== a.charCodeAt(al) ) { break; }
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bi += 1;
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al += 1;
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}
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}
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// all segment characters matched
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if ( bi === bR ) {
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// needle remainder: no
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if ( al === aR ) {
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return this.addLeft(icell, a, i);
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}
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// needle remainder: yes
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inext = buf32[icell+CELL_AND];
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if ( buf32[inext+CELL_AND] !== 0 ) {
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icell = inext;
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continue;
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}
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// add needle remainder
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icell = this.addCell(0, 0, this.addSegment(a, al, aR));
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buf32[inext+CELL_AND] = icell;
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return this.addLeft(icell, a, i);
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}
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// some characters matched
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// split current segment
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bl -= char0;
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buf32[icell+SEGMENT_INFO] = bi << 24 | bl;
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inext = this.addCell(
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buf32[icell+CELL_AND],
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0,
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bR - bi << 24 | bl + bi
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);
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buf32[icell+CELL_AND] = inext;
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// needle remainder: no = need boundary cell
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if ( al === aR ) {
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return this.addLeft(icell, a, i);
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}
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// needle remainder: yes = need new cell for remaining characters
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icell = this.addCell(0, 0, this.addSegment(a, al, aR));
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buf32[inext+CELL_OR] = icell;
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return this.addLeft(icell, a, i);
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}
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}
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addLeft(icell, a, i) {
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const buf32 = this.buf32;
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// fetch boundary cell
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let inext = buf32[icell+CELL_AND];
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// add boundary cell if none exist
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if ( inext === 0 || buf32[inext+SEGMENT_INFO] !== 0 ) {
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const iboundary = this.allocateCell();
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buf32[icell+CELL_AND] = iboundary;
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buf32[iboundary+BCELL_RIGHT_AND] = inext;
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if ( i === 0 ) { return 1; }
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buf32[iboundary+BCELL_LEFT_AND] = this.allocateCell();
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inext = iboundary;
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}
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// shortest match is always first so no point storing whatever is left
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if ( buf32[inext+BCELL_LEFT_AND] === 0 ) {
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return i === 0 ? 0 : 1;
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}
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// bail out if no left segment
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if ( i === 0 ) {
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buf32[inext+BCELL_LEFT_AND] = 0;
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return 1;
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}
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// fetch root cell of left segment
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icell = buf32[inext+BCELL_LEFT_AND];
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// special case: first node in trie
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if ( buf32[icell+SEGMENT_INFO] === 0 ) {
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buf32[icell+SEGMENT_INFO] = this.addSegment(a, 0, i);
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return 1;
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}
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const buf8 = this.buf;
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const char0 = buf32[CHAR0_SLOT];
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let ar = i;
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// find a matching cell: move down
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for (;;) {
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const binfo = buf32[icell+SEGMENT_INFO];
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// skip boundary cells
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if ( binfo === 0 ) {
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icell = buf32[icell+CELL_AND];
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continue;
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}
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const bL = char0 + (binfo & 0x00FFFFFF);
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const bR = bL + (binfo >>> 24);
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let br = bR;
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// if first character is no match, move to next descendant
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if ( buf8[br-1] !== a.charCodeAt(ar-1) ) {
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inext = buf32[icell+CELL_OR];
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if ( inext === 0 ) {
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inext = this.addCell(0, 0, this.addSegment(a, 0, ar));
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buf32[icell+CELL_OR] = inext;
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return 1;
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}
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icell = inext;
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continue;
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}
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// 1st character was tested
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br -= 1;
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ar -= 1;
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// find 1st mismatch in rest of segment
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if ( br !== bL ) {
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for (;;) {
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if ( br === bL ) { break; }
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if ( ar === 0 ) { break; }
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if ( buf8[br-1] !== a.charCodeAt(ar-1) ) { break; }
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br -= 1;
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ar -= 1;
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}
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}
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// all segment characters matched
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if ( br === bL ) {
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inext = buf32[icell+CELL_AND];
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// needle remainder: no
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if ( ar === 0 ) {
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// boundary cell already present
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if ( inext === 0 || buf32[inext+SEGMENT_INFO] === 0 ) {
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return 0;
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}
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// need boundary cell
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buf32[icell+CELL_AND] = this.addCell(inext, 0, 0);
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}
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// needle remainder: yes
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else {
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if ( inext !== 0 ) {
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icell = inext;
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continue;
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}
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// boundary cell + needle remainder
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inext = this.addCell(0, 0, 0);
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buf32[icell+CELL_AND] = inext;
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buf32[inext+CELL_AND] =
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this.addCell(0, 0, this.addSegment(a, 0, ar));
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}
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}
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// some segment characters matched
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else {
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// split current cell
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buf32[icell+SEGMENT_INFO] = (bR - br) << 24 | (br - char0);
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inext = this.addCell(
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buf32[icell+CELL_AND],
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0,
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(br - bL) << 24 | (bL - char0)
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);
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buf32[icell+CELL_AND] = inext;
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// needle remainder: no = need boundary cell
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if ( ar === 0 ) {
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buf32[icell+CELL_AND] = this.addCell(inext, 0, 0);
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}
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// needle remainder: yes = need new cell for remaining characters
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else {
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buf32[inext+CELL_OR] =
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this.addCell(0, 0, this.addSegment(a, 0, ar));
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}
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}
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return 1;
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}
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}
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optimize() {
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this.shrinkBuf();
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return {
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byteLength: this.buf.byteLength,
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char0: this.buf32[CHAR0_SLOT],
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};
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}
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serialize(encoder) {
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if ( encoder instanceof Object ) {
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return encoder.encode(
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this.buf32.buffer,
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this.buf32[CHAR1_SLOT]
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);
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}
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return Array.from(
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new Uint32Array(
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this.buf32.buffer,
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0,
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this.buf32[CHAR1_SLOT] + 3 >>> 2
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)
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);
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}
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unserialize(selfie, decoder) {
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const shouldDecode = typeof selfie === 'string';
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let byteLength = shouldDecode
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? decoder.decodeSize(selfie)
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: selfie.length << 2;
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if ( byteLength === 0 ) { return false; }
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byteLength = byteLength + PAGE_SIZE-1 & ~(PAGE_SIZE-1);
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if ( byteLength > this.buf.length ) {
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this.buf = new Uint8Array(byteLength);
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this.buf32 = new Uint32Array(this.buf.buffer);
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}
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if ( shouldDecode ) {
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decoder.decode(selfie, this.buf.buffer);
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} else {
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this.buf32.set(selfie);
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}
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return true;
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}
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//--------------------------------------------------------------------------
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// Private methods
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//--------------------------------------------------------------------------
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allocateCell() {
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let icell = this.buf32[TRIE1_SLOT];
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this.buf32[TRIE1_SLOT] = icell + CELL_BYTE_LENGTH;
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icell >>>= 2;
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this.buf32[icell+0] = 0;
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this.buf32[icell+1] = 0;
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this.buf32[icell+2] = 0;
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return icell;
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}
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addCell(iand, ior, v) {
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const icell = this.allocateCell();
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this.buf32[icell+CELL_AND] = iand;
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this.buf32[icell+CELL_OR] = ior;
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this.buf32[icell+SEGMENT_INFO] = v;
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return icell;
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}
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addSegment(s, l, r) {
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const n = r - l;
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if ( n === 0 ) { return 0; }
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const buf32 = this.buf32;
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const des = buf32[CHAR1_SLOT];
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buf32[CHAR1_SLOT] = des + n;
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const buf8 = this.buf;
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for ( let i = 0; i < n; i++ ) {
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buf8[des+i] = s.charCodeAt(l+i);
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}
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return (n << 24) | (des - buf32[CHAR0_SLOT]);
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}
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growBuf(trieGrow, charGrow) {
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const char0 = Math.max(
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(this.buf32[TRIE1_SLOT] + trieGrow + PAGE_SIZE-1) & ~(PAGE_SIZE-1),
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this.buf32[CHAR0_SLOT]
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);
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const char1 = char0 + this.buf32[CHAR1_SLOT] - this.buf32[CHAR0_SLOT];
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const bufLen = Math.max(
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(char1 + charGrow + PAGE_SIZE-1) & ~(PAGE_SIZE-1),
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this.buf.length
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);
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this.resizeBuf(bufLen, char0);
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}
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shrinkBuf() {
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const char0 = this.buf32[TRIE1_SLOT] + MIN_FREE_CELL_BYTE_LENGTH;
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const char1 = char0 + this.buf32[CHAR1_SLOT] - this.buf32[CHAR0_SLOT];
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const bufLen = char1 + 256;
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this.resizeBuf(bufLen, char0);
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}
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resizeBuf(bufLen, char0) {
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bufLen = bufLen + PAGE_SIZE-1 & ~(PAGE_SIZE-1);
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if (
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bufLen === this.buf.length &&
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char0 === this.buf32[CHAR0_SLOT]
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) {
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return;
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}
|
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const charDataLen = this.buf32[CHAR1_SLOT] - this.buf32[CHAR0_SLOT];
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if ( bufLen !== this.buf.length ) {
|
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const newBuf = new Uint8Array(bufLen);
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newBuf.set(
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new Uint8Array(
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this.buf.buffer,
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0,
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this.buf32[TRIE1_SLOT]
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),
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0
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);
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newBuf.set(
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new Uint8Array(
|
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this.buf.buffer,
|
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this.buf32[CHAR0_SLOT],
|
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charDataLen
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),
|
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char0
|
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);
|
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this.buf = newBuf;
|
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this.buf32 = new Uint32Array(this.buf.buffer);
|
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this.buf32[CHAR0_SLOT] = char0;
|
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this.buf32[CHAR1_SLOT] = char0 + charDataLen;
|
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}
|
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if ( char0 !== this.buf32[CHAR0_SLOT] ) {
|
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this.buf.set(
|
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new Uint8Array(
|
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this.buf.buffer,
|
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this.buf32[CHAR0_SLOT],
|
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charDataLen
|
|
),
|
|
char0
|
|
);
|
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this.buf32[CHAR0_SLOT] = char0;
|
|
this.buf32[CHAR1_SLOT] = char0 + charDataLen;
|
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}
|
|
}
|
|
};
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/*******************************************************************************
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|
Class to hold reference to a specific trie
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*/
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µBlock.BidiTrieContainer.prototype.STrieRef = class {
|
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constructor(container, iroot, size) {
|
|
this.container = container;
|
|
this.iroot = iroot;
|
|
this.size = size;
|
|
}
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|
|
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add(s, i = 0) {
|
|
if ( this.container.add(this.iroot, s, i) === 1 ) {
|
|
this.size += 1;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
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|
|
matches(a, i) {
|
|
return this.container.matches(this.iroot, a, i);
|
|
}
|
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|
|
dump() {
|
|
for ( const s of this ) {
|
|
console.log(s);
|
|
}
|
|
}
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|
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[Symbol.iterator]() {
|
|
return {
|
|
value: undefined,
|
|
done: false,
|
|
next: function() {
|
|
if ( this.icell === 0 ) {
|
|
if ( this.forks.length === 0 ) {
|
|
this.value = undefined;
|
|
this.done = true;
|
|
return this;
|
|
}
|
|
this.charPtr = this.forks.pop();
|
|
this.icell = this.forks.pop();
|
|
}
|
|
for (;;) {
|
|
const idown = this.container.buf32[this.icell+CELL_OR];
|
|
if ( idown !== 0 ) {
|
|
this.forks.push(idown, this.charPtr);
|
|
}
|
|
const v = this.container.buf32[this.icell+SEGMENT_INFO];
|
|
let i0 = this.container.buf32[CHAR0_SLOT] + (v & 0x00FFFFFF);
|
|
const i1 = i0 + (v >>> 24);
|
|
while ( i0 < i1 ) {
|
|
this.charBuf[this.charPtr] = this.container.buf[i0];
|
|
this.charPtr += 1;
|
|
i0 += 1;
|
|
}
|
|
this.icell = this.container.buf32[this.icell+CELL_AND];
|
|
if ( this.icell === 0 ) {
|
|
return this.toPattern();
|
|
}
|
|
if ( this.container.buf32[this.icell+SEGMENT_INFO] === 0 ) {
|
|
this.icell = this.container.buf32[this.icell+CELL_AND];
|
|
return this.toPattern();
|
|
}
|
|
}
|
|
},
|
|
toPattern: function() {
|
|
this.value = this.textDecoder.decode(
|
|
new Uint8Array(this.charBuf.buffer, 0, this.charPtr)
|
|
);
|
|
return this;
|
|
},
|
|
container: this.container,
|
|
icell: this.iroot,
|
|
charBuf: new Uint8Array(256),
|
|
charPtr: 0,
|
|
forks: [],
|
|
textDecoder: new TextDecoder()
|
|
};
|
|
}
|
|
};
|
|
|
|
// end of local namespace
|
|
// *****************************************************************************
|
|
|
|
}
|