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How to use read_bits_direct method in redwood
Best JavaScript code snippet using redwood
jsunzip.js
Source:jsunzip.js 
...293 d.tag >>= 1;294 return bit;295}296/* read a num bit value from a stream and add base */297function read_bits_direct(source, bitcount, tag, idx, num)298{299 var val = 0;300 while (bitcount < 24) {301 tag = tag | (source[idx++] & 0xff) << bitcount;302 bitcount += 8;303 }304 val = tag & (0xffff >> (16 - num));305 tag >>= num;306 bitcount -= num;307 return [bitcount, tag, idx, val];308}309this.read_bits = function(d, num, base)310{311 if (!num)312 return base;313 var ret = read_bits_direct(d.source, d.bitcount, d.tag, d.sourceIndex, num);314 d.bitcount = ret[0];315 d.tag = ret[1];316 d.sourceIndex = ret[2];317 return ret[3] + base;318}319/* given a data stream and a tree, decode a symbol */320this.decode_symbol = function(d, t)321{322 while (d.bitcount < 16) {323 d.tag = d.tag | (d.source[d.sourceIndex++] & 0xff) << d.bitcount;324 d.bitcount += 8;325 }326 327 var sum = 0, cur = 0, len = 0;...
tinf.js
Source:tinf.js
...158 this.read_bits = function(d, num, base) {159 if (!num) {160 return base;161 }162 var ret = read_bits_direct(d.source, d.bitcount, d.tag, d.sourceIndex, num);163 d.bitcount = ret[0];164 d.tag = ret[1];165 d.sourceIndex = ret[2];166 return ret[3] + base;167 };168 /* given a data stream and a tree, decode a symbol */169 this.decode_symbol = function(d, t) {170 while (d.bitcount < 16) {171 d.tag = d.tag | (d.source[d.sourceIndex++] & 0xff) << d.bitcount;172 d.bitcount += 8;173 }174 var sum = 0, cur = 0, len = 0;175 do {176 cur = 2 * cur + ((d.tag & (1 << len)) >> len);177 ++len;178 sum += t.table[len];179 cur -= t.table[len];180 } while (cur >= 0);181 d.tag >>= len;182 d.bitcount -= len;183 return t.trans[sum + cur];184 };185 /* given a data stream, decode dynamic trees from it */186 this.decode_trees = function(d, lt, dt) {187 var code_tree = new this.TREE();188 var lengths = new Array(288+32);189 var hlit, hdist, hclen;190 var i, num, length;191 /* get 5 bits HLIT (257-286) */192 hlit = this.read_bits(d, 5, 257);193 /* get 5 bits HDIST (1-32) */194 hdist = this.read_bits(d, 5, 1);195 /* get 4 bits HCLEN (4-19) */196 hclen = this.read_bits(d, 4, 4);197 for (i = 0; i < 19; ++i) { lengths[i] = 0; }198 /* read code lengths for code length alphabet */199 for (i = 0; i < hclen; ++i) {200 /* get 3 bits code length (0-7) */201 var clen = this.read_bits(d, 3, 0);202 lengths[this.clcidx[i]] = clen;203 }204 /* build code length tree */205 this.build_tree(code_tree, lengths, 0, 19);206 /* decode code lengths for the dynamic trees */207 for (num = 0; num < hlit + hdist;) {208 var sym = this.decode_symbol(d, code_tree);209 switch (sym) {210 case 16:211 /* copy previous code length 3-6 times (read 2 bits) */212 {213 var prev = lengths[num - 1];214 for (length = this.read_bits(d, 2, 3); length; --length) {215 lengths[num++] = prev;216 }217 }218 break;219 case 17:220 /* repeat code length 0 for 3-10 times (read 3 bits) */221 for (length = this.read_bits(d, 3, 3); length; --length) {222 lengths[num++] = 0;223 }224 break;225 case 18:226 /* repeat code length 0 for 11-138 times (read 7 bits) */227 for (length = this.read_bits(d, 7, 11); length; --length) {228 lengths[num++] = 0;229 }230 break;231 default:232 /* values 0-15 represent the actual code lengths */233 lengths[num++] = sym;234 break;235 }236 }237 /* build dynamic trees */238 this.build_tree(lt, lengths, 0, hlit);239 this.build_tree(dt, lengths, hlit, hdist);240 };241 /* ----------------------------- *242 * -- block inflate functions -- *243 * ----------------------------- */244 /* given a stream and two trees, inflate a block of data */245 this.inflate_block_data = function(d, lt, dt) {246 // js optimization.247 var ddest = d.dest;248 var ddestlength = ddest.length;249 while (1) {250 var sym = this.decode_symbol(d, lt);251 /* check for end of block */252 if (sym === 256) {253 return this.OK;254 }255 if (sym < 256) {256 ddest[ddestlength++] = sym; // ? String.fromCharCode(sym);257 d.history.push(sym);258 } else {259 var length, dist, offs;260 var i;261 sym -= 257;262 /* possibly get more bits from length code */263 length = this.read_bits(d, this.length_bits[sym], this.length_base[sym]);264 dist = this.decode_symbol(d, dt);265 /* possibly get more bits from distance code */266 offs = d.history.length - this.read_bits(d, this.dist_bits[dist], this.dist_base[dist]);267 if (offs < 0) {268 throw new Error('Invalid zlib offset ' + offs);269 }270 /* copy match */271 for (i = offs; i < offs + length; ++i) {272 //ddest[ddestlength++] = ddest[i];273 ddest[ddestlength++] = d.history[i];274 d.history.push(d.history[i]);275 }276 }277 }278 };279 /* inflate an uncompressed block of data */280 this.inflate_uncompressed_block = function(d) {281 var length, invlength;282 var i;283 if (d.bitcount > 7) {284 var overflow = Math.floor(d.bitcount / 8);285 d.sourceIndex -= overflow;286 d.bitcount = 0;287 d.tag = 0;288 }289 /* get length */290 length = d.source[d.sourceIndex+1];291 length = 256*length + d.source[d.sourceIndex];292 /* get one's complement of length */293 invlength = d.source[d.sourceIndex+3];294 invlength = 256*invlength + d.source[d.sourceIndex+2];295 /* check length */296 if (length !== (~invlength & 0x0000ffff)) {297 return this.DATA_ERROR;298 }299 d.sourceIndex += 4;300 /* copy block */301 for (i = length; i; --i) {302 d.history.push(d.source[d.sourceIndex]);303 d.dest[d.dest.length] = d.source[d.sourceIndex++];304 }305 /* make sure we start next block on a byte boundary */306 d.bitcount = 0;307 return this.OK;308 };309 /* inflate a block of data compressed with fixed huffman trees */310 this.inflate_fixed_block = function(d) {311 /* decode block using fixed trees */312 return this.inflate_block_data(d, this.sltree, this.sdtree);313 };314 /* inflate a block of data compressed with dynamic huffman trees */315 this.inflate_dynamic_block = function(d) {316 /* decode trees from stream */317 this.decode_trees(d, d.ltree, d.dtree);318 /* decode block using decoded trees */319 return this.inflate_block_data(d, d.ltree, d.dtree);320 };321 /* ---------------------- *322 * -- public functions -- *323 * ---------------------- */324 /* initialize global (static) data */325 this.init = function() {326 /* build fixed huffman trees */327 this.build_fixed_trees(this.sltree, this.sdtree);328 /* build extra bits and base tables */329 this.build_bits_base(this.length_bits, this.length_base, 4, 3);330 this.build_bits_base(this.dist_bits, this.dist_base, 2, 1);331 /* fix a special case */332 this.length_bits[28] = 0;333 this.length_base[28] = 258;334 this.reset();335 };336 this.reset = function() {337 this.d = new this.DATA(this);338 delete this.header;339 };340 /* inflate stream from source to dest */341 this.uncompress = function(source, offset) {342 var d = this.d;343 var bfinal;344 /* initialise data */345 d.source = source;346 d.sourceIndex = offset;347 d.bitcount = 0;348 d.dest = [];349 // Skip zlib header at start of stream350 if (typeof this.header === 'undefined') {351 this.header = this.read_bits(d, 16, 0);352 /* byte 0: 0x78, 7 = 32k window size, 8 = deflate */353 /* byte 1: check bits for header and other flags */354 }355 var blocks = 0;356 do {357 var btype;358 var res;359 /* read final block flag */360 bfinal = this.getbit(d);361 /* read block type (2 bits) */362 btype = this.read_bits(d, 2, 0);363 /* decompress block */364 switch (btype) {365 case 0:366 /* decompress uncompressed block */367 res = this.inflate_uncompressed_block(d);368 break;369 case 1:370 /* decompress block with fixed huffman trees */371 res = this.inflate_fixed_block(d);372 break;373 case 2:374 /* decompress block with dynamic huffman trees */375 res = this.inflate_dynamic_block(d);376 break;377 default:378 return { 'status' : this.DATA_ERROR };379 }380 if (res !== this.OK) {381 return { 'status' : this.DATA_ERROR };382 }383 blocks++;384 } while (!bfinal && d.sourceIndex < d.source.length);385 d.history = d.history.slice(-this.WINDOW_SIZE);386 return { 'status' : this.OK, 'data' : d.dest };387 };388}389/**390 * Private API.391 */392/* read a num bit value from a stream and add base */393function read_bits_direct(source, bitcount, tag, idx, num) {394 var val = 0;395 while (bitcount < 24) {396 tag = tag | (source[idx++] & 0xff) << bitcount;397 bitcount += 8;398 }399 val = tag & (0xffff >> (16 - num));400 tag >>= num;401 bitcount -= num;402 return [bitcount, tag, idx, val];...
Using AI Code Generation
1var redwood = require('./build/Release/redwood');2var fs = require('fs');3var path = require('path');4var file_path = path.join(__dirname, "test_file");5var fd = fs.openSync(file_path, 'r');6var file_size = fs.fstatSync(fd).size;7console.log("file size: " + file_size);8var buffer = new Buffer(8);9var offset = 0;10var length = 8;11var bit_offset = 0;12var bit_length = 64;13var read_bits = redwood.read_bits_direct(fd, bit_offset, bit_length, buffer, offset, length);14console.log("read_bits: " + read_bits);15var data = buffer.readUInt32BE(0);16console.log("data: " + data);17fs.closeSync(fd);
Using AI Code Generation
1var redwood = require('redwood');2var fs = require('fs');3var buf = new Buffer(10);4fs.open('test.dat', 'r', function(err, fd) {5 redwood.read_bits_direct(fd, 0, 10, buf, 0, function(err, bytesRead, buffer) {6 console.log(buffer);7 });8});9var redwood = require('redwood');10var fs = require('fs');11var buf = new Buffer('Hello');12fs.open('test.dat', 'w', function(err, fd) {13 redwood.write_bits_direct(fd, 0, 10, buf, 0, function(err, bytesWritten, buffer) {14 console.log(buffer);15 });16});17var redwood = require('redwood');18var fs = require('fs');19var buf = new Buffer(10);20fs.open('test.dat', 'r', function(err, fd) {21 redwood.read_bits(fd, 0, 10, buf, 0, function(err, bytesRead, buffer) {22 console.log(buffer);23 });24});25var redwood = require('redwood');26var fs = require('fs');27var buf = new Buffer('Hello');28fs.open('test.dat', 'w', function(err, fd) {29 redwood.write_bits(fd, 0, 10, buf, 0, function(err, bytesWritten, buffer) {30 console.log(buffer);31 });32});
Using AI Code Generation
1var redwood = require('bindings')('redwood.node');2var fs = require('fs');3var path = require('path');4var assert = require('assert');5var util = require('util');6var f = path.join(__dirname, 'test.txt');7var f2 = path.join(__dirname, 'test2.txt');8var f3 = path.join(__dirname, 'test3.txt');9var f4 = path.join(__dirname, 'test4.txt');10var f5 = path.join(__dirname, 'test5.txt');11var f6 = path.join(__dirname, 'test6.txt');12var f7 = path.join(__dirname, 'test7.txt');13var f8 = path.join(__dirname, 'test8.txt');14var f9 = path.join(__dirname, 'test9.txt');15var f10 = path.join(__dirname, 'test10.txt');16var f11 = path.join(__dirname, 'test11.txt');17var f12 = path.join(__dirname, 'test12.txt');18var f13 = path.join(__dirname, 'test13.txt');19var f14 = path.join(__dirname, 'test14.txt');20var f15 = path.join(__dirname, 'test15.txt');21var f16 = path.join(__dirname, 'test16.txt');22var f17 = path.join(__dirname, 'test17.txt');23var f18 = path.join(__dirname, 'test18.txt');24var f19 = path.join(__dirname, 'test19.txt');25var f20 = path.join(__dirname, 'test20.txt');26var f21 = path.join(__dirname, 'test21.txt');27var f22 = path.join(__dirname, 'test22.txt');28var f23 = path.join(__dirname, 'test23.txt');29var f24 = path.join(__dirname, 'test24.txt');30var f25 = path.join(__dirname, 'test25.txt');31var f26 = path.join(__dirname, 'test26.txt');32var f27 = path.join(__dirname, 'test27.txt');33var f28 = path.join(__dirname, 'test28.txt');34var f29 = path.join(__dirname, 'test29.txt');35var f30 = path.join(__dirname, 'test30.txt');36var f31 = path.join(__dirname, 'test31.txt');37var f32 = path.join(__dirname, 'test32.txt');38var f33 = path.join(__dirname, 'test
Using AI Code Generation
1var redwood = require('./redwood.js');2var fs = require('fs');3var file = fs.openSync("test.txt", 'r');4var buf = new Buffer(8);5var pos = 0;6var bit_pos = 0;7var num_bits = 8;8var result = redwood.read_bits_direct(file, buf, pos, bit_pos, num_bits);9console.log("read_bits_direct result = " + result);10fs.closeSync(file);11var redwood = require('./redwood.js');12var fs = require('fs');13var file = fs.openSync("test.txt", 'r');14var buf = new Buffer(8);15var pos = 0;16var bit_pos = 0;17var num_bits = 8;18var result = redwood.read_bits_direct(file, buf, pos, bit_pos, num_bits);19console.log("read_bits_direct result = " + result);20fs.closeSync(file);21var redwood = require('./redwood.js');22var fs = require('fs');23var file = fs.openSync("test.txt", 'r');24var buf = new Buffer(8);25var pos = 0;26var bit_pos = 0;
Using AI Code Generation
1var redwood = require('redwood');2var file = redwood.open("testfile.txt");3var len = file.length();4var buffer = new Buffer(100);5file.read_bits_direct(0, 100, buffer, 0);6console.log(buffer.toString());7file.close();8### `read_bits_direct_sync(offset, length, buffer, buffer_offset)`9### `read_bits_sync(offset, length)`10### `read_sync(offset, length)`11### `write_bits_direct(offset, buffer, buffer_offset, length)`12### `write_bits_direct_sync(offset, buffer, buffer_offset, length)`13### `write_bits(offset, buffer, buffer_offset, length)`14### `write_bits_sync(offset, buffer, buffer_offset, length)`15### `write(offset, buffer, buffer_offset, length)`16### `write_sync(offset, buffer, buffer_offset, length)`17### `write_buffer(buffer)`18### `write_buffer_sync(buffer)`19### `close()`20### `close_sync()`21### `length()`22### `length_sync()`23### `truncate(length)`24### `truncate_sync(length)`25### `flush()`26### `flush_sync()`
Using AI Code Generation
1const redwood = require("redwood");2const buffer = redwood.read_file("test.bin");3const bits = redwood.read_bits_direct(buffer, 8);4console.log(bits);5const redwood = require("redwood");6const buffer = redwood.read_file("test.bin");7const bits = redwood.read_bits(buffer, 8);8console.log(bits);9const redwood = require("redwood");10const buffer = redwood.read_file("test.bin");11const bits = redwood.read_bits_reverse(buffer, 8);12console.log(bits);13const redwood = require("redwood");14const buffer = redwood.read_file("test.bin");15const bits = redwood.read_bits_reverse_direct(buffer, 8);16console.log(bits);17const redwood = require("redwood");18const buffer = redwood.read_file("test.bin");19const bits = redwood.read_bits_reverse_direct(buffer, 8);20console.log(bits);21const redwood = require("redwood");22const buffer = redwood.read_file("test.bin");23const bits = redwood.read_bits_reverse_direct(buffer, 8);24console.log(bits);25const redwood = require("redwood");
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