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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