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Fixes & tests for surrogates support in strings encoder/decoder

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This commit is contained in:
Vitaly Puzrin 2014-04-14 23:30:34 +04:00
parent c58bfccd1b
commit 4d3acc2961
3 changed files with 104 additions and 63 deletions
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8
README.md
View file

@ -30,13 +30,13 @@ node v0.10.26, 1mb sample:
deflate-gildas x 4.58 ops/sec ±2.33% (15 runs sampled)
deflate-imaya x 3.22 ops/sec ±3.95% (12 runs sampled)
! deflate-pako x 6.99 ops/sec ±0.51% (21 runs sampled)
deflate-pako-string x 6.22 ops/sec ±0.76% (19 runs sampled)
deflate-pako-string x 5.89 ops/sec ±0.77% (18 runs sampled)
deflate-pako-untyped x 4.39 ops/sec ±1.58% (14 runs sampled)
* deflate-zlib x 14.71 ops/sec ±4.23% (59 runs sampled)
inflate-dankogai x 32.16 ops/sec ±0.13% (56 runs sampled)
inflate-imaya x 30.35 ops/sec ±0.92% (53 runs sampled)
! inflate-pako x 69.89 ops/sec ±1.46% (71 runs sampled)
inflate-pako-string x 64.99 ops/sec ±1.64% (67 runs sampled)
inflate-pako-string x 12.46 ops/sec ±5.65% (36 runs sampled)
inflate-pako-untyped x 17.19 ops/sec ±0.85% (32 runs sampled)
* inflate-zlib x 70.03 ops/sec ±1.64% (81 runs sampled)
@ -46,13 +46,13 @@ node v0.11.12, 1mb sample:
deflate-gildas x 5.06 ops/sec ±6.00% (16 runs sampled)
deflate-imaya x 3.52 ops/sec ±3.71% (13 runs sampled)
! deflate-pako x 11.52 ops/sec ±0.22% (32 runs sampled)
deflate-pako-string x 9.61 ops/sec ±0.97% (28 runs sampled)
deflate-pako-string x 9.53 ops/sec ±1.12% (27 runs sampled)
deflate-pako-untyped x 5.44 ops/sec ±0.72% (17 runs sampled)
* deflate-zlib x 14.05 ops/sec ±3.34% (63 runs sampled)
inflate-dankogai x 42.19 ops/sec ±0.09% (56 runs sampled)
inflate-imaya x 79.68 ops/sec ±1.07% (68 runs sampled)
! inflate-pako x 97.52 ops/sec ±0.83% (80 runs sampled)
inflate-pako-string x 89.05 ops/sec ±0.48% (76 runs sampled)
inflate-pako-string x 19.07 ops/sec ±12.67% (32 runs sampled)
inflate-pako-untyped x 24.35 ops/sec ±2.59% (40 runs sampled)
* inflate-zlib x 60.32 ops/sec ±1.36% (69 runs sampled)
```

88
lib/utils/strings.js
View file

@ -10,64 +10,66 @@ var STR_APPLY_OK = true;
try { String.fromCharCode.apply(null, [0]); } catch(__) { STR_APPLY_OK = false; }
// Table with utf8 lengths
var utf8len = new utils.Buf8(256);
// Table with utf8 lengths (calculated by first byte of sequence)
// Note, that 5 & 6-byte values and some 4-byte values can not be represented in JS,
// because max possible codepoiny is 0x10ffff
var _utf8len = new utils.Buf8(256);
for (var i=0; i<256; i++) {
utf8len[i] = (i >= 252 ? 6 : i >= 248 ? 5 : i >= 240 ? 4 : i >= 224 ? 3 : i >= 192 ? 2 : 1);
_utf8len[i] = (i >= 252 ? 6 : i >= 248 ? 5 : i >= 240 ? 4 : i >= 224 ? 3 : i >= 192 ? 2 : 1);
}
_utf8len[254]=_utf8len[254]=1; // Invalid sequence start
// convert string to array (typed, when possible)
// src: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
exports.string2buf = function (str) {
var buf, c, str_len = str.length, buf_len = 0;
var buf, c, c2, m_pos, i, str_len = str.length, buf_len = 0;
/* mapping... */
for (var m_pos = 0; m_pos < str_len; m_pos++) {
for (m_pos = 0; m_pos < str_len; m_pos++) {
c = str.charCodeAt(m_pos);
buf_len += c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : c < 0x200000 ? 4 : c < 0x4000000 ? 5 : 6;
if ((c & 0xfc00) === 0xd800 && (m_pos+1 < str_len)) {
c2 = str.charCodeAt(m_pos+1);
if ((c2 & 0xfc00) === 0xdc00) {
c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
m_pos++;
}
}
buf_len += c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : 4;
}
buf = new utils.Buf8(buf_len);
/* transcription... */
for (var i = 0, c_pos = 0; i < buf_len; c_pos++) {
c = str.charCodeAt(c_pos);
if (c < 128) {
for (i=0, m_pos = 0; i < buf_len; m_pos++) {
c = str.charCodeAt(m_pos);
if ((c & 0xfc00) === 0xd800 && (m_pos+1 < str_len)) {
c2 = str.charCodeAt(m_pos+1);
if ((c2 & 0xfc00) === 0xdc00) {
c = 0x10000 + ((c - 0xd800) << 10) + (c2 - 0xdc00);
m_pos++;
}
}
if (c < 0x80) {
/* one byte */
buf[i++] = c;
} else if (c < 0x800) {
/* two bytes */
buf[i++] = 192 + (c >>> 6);
buf[i++] = 128 + (c & 63);
buf[i++] = 0xC0 | (c >>> 6);
buf[i++] = 0x80 | (c & 0x3f);
} else if (c < 0x10000) {
/* three bytes */
buf[i++] = 224 + (c >>> 12);
buf[i++] = 128 + (c >>> 6 & 63);
buf[i++] = 128 + (c & 63);
} else if (c < 0x200000) {
buf[i++] = 0xE0 | (c >>> 12);
buf[i++] = 0x80 | (c >>> 6 & 0x3f);
buf[i++] = 0x80 | (c & 0x3f);
} else {
/* four bytes */
buf[i++] = 240 + (c >>> 18);
buf[i++] = 128 + (c >>> 12 & 63);
buf[i++] = 128 + (c >>> 6 & 63);
buf[i++] = 128 + (c & 63);
} else if (c < 0x4000000) {
/* five bytes */
buf[i++] = 248 + (c >>> 24);
buf[i++] = 128 + (c >>> 18 & 63);
buf[i++] = 128 + (c >>> 12 & 63);
buf[i++] = 128 + (c >>> 6 & 63);
buf[i++] = 128 + (c & 63);
} else /* if (c <= 0x7fffffff) */ {
/* six bytes */
buf[i++] = 252 + /* (c >>> 32) is not possible in ECMAScript! So...: */ (c / 1073741824);
buf[i++] = 128 + (c >>> 24 & 63);
buf[i++] = 128 + (c >>> 18 & 63);
buf[i++] = 128 + (c >>> 12 & 63);
buf[i++] = 128 + (c >>> 6 & 63);
buf[i++] = 128 + (c & 63);
buf[i++] = 0xf0 | (c >>> 18);
buf[i++] = 0x80 | (c >>> 12 & 0x3f);
buf[i++] = 0x80 | (c >>> 6 & 0x3f);
buf[i++] = 0x80 | (c & 0x3f);
}
}
@ -104,7 +106,7 @@ exports.binstring2buf = function(str) {
// src: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
exports.buf2string = function (buf, max) {
/*jshint nonstandard:true*/
// That's not as fast as via String.fromCharCode.appy
// That's not as fast as via String.fromCharCode.apply
/*return decodeURIComponent(escape(exports.buf2binstring(
(buf.length === max) ?
buf
@ -115,24 +117,24 @@ exports.buf2string = function (buf, max) {
var str, i, out, part, char_len;
var len = max || buf.length;
// Reserve max possibli length
// Reserve max possible length (2 words per char)
var utf16buf = new utils.Buf16(len*2);
for (out=0, i=0; i<len; i++) {
part = buf[i];
char_len = utf8len[part];
char_len = _utf8len[part];
// edge case - broken sequence
if (i + char_len > len) {
utf16buf[out++] = 0xfffd;
break;
break; // end of string reached, stop
}
switch (char_len) {
case 1:
utf16buf[out++] = part;
break;
case 2:
utf16buf[out++] = ((part & 0x1f) << 6) | (buf[++i] & 0x7f);
utf16buf[out++] = ((part & 0x1f) << 6) | (buf[++i] & 0x3f);
break;
case 3:
utf16buf[out++] = ((part & 0x0f) << 12) | ((buf[++i] & 0x3f) << 6) | (buf[++i] & 0x3f);
@ -144,17 +146,15 @@ exports.buf2string = function (buf, max) {
utf16buf[out++] = 0xd800 | ((part >> 10) & 0x3ff);
utf16buf[out++] = 0xdc00 | (part & 0x3ff);
break;
// 5 & 6 bytes uticodes not supported in UTF16 (JS), so fill with dummy symbol
// 5 & 6 bytes uticodes not supported in UTF16 (JS),
// so fill with dummy symbol & update scan position.
case 5:
i += 4;
utf16buf[out++] = 0xfffd;
//utf16buf[out++] = (part - 248 << 24) + (buf[++i] - 128 << 18) + (buf[++i] - 128 << 12) + (buf[++i] - 128 << 6) + buf[++i] - 128;
break;
case 6:
i += 5;
utf16buf[out++] = 0xfffd;
// (part - 252 << 32) is not possible in ECMAScript! So...:
//utf16buf[out++] = (part - 252) * 1073741824 + (buf[++i] - 128 << 24) + (buf[++i] - 128 << 18) + (buf[++i] - 128 << 12) + (buf[++i] - 128 << 6) + buf[++i] - 128;
break;
}
}
@ -174,5 +174,5 @@ exports.buf2string = function (buf, max) {
// calculate tail size of utf8 char by current byte value
exports.utf8tail = function(code) {
return utf8len[code];
return _utf8len[code];
};

71
test/strings.js
View file

@ -9,17 +9,62 @@ var path = require('path');
var assert = require('assert');
var pako = require('../index');
var cmp = require('./helpers').cmpBuf;
var strings = require('../lib/utils/strings');
var helpers = require('./helpers');
var cmp = helpers.cmpBuf;
// fromCharCode, but understands right > 0xffff values
function fixedFromCharCode(code) {
/*jshint bitwise: false*/
if (code > 0xffff) {
code -= 0x10000;
var surrogate1 = 0xd800 + (code >> 10)
, surrogate2 = 0xdc00 + (code & 0x3ff);
return String.fromCharCode(surrogate1, surrogate2);
} else {
return String.fromCharCode(code);
}
}
// Converts array of codes / chars / strings to utf16 string
function a2utf16(arr) {
var result = '';
arr.forEach(function (item) {
if (typeof item === 'string') { result += item; return; }
result += fixedFromCharCode(item);
});
return result;
}
var file = path.join(__dirname, 'fixtures/samples/lorem_utf_100k.txt');
var sampleString = fs.readFileSync(file, 'utf8');
var sampleArray = new Uint8Array(fs.readFileSync(file));
describe('Encode/Decode', function () {
var utf16sample = a2utf16([0x1f3b5, 'abcd', 0x266a, 0x35, 0xe800, 0x10ffff, 0x0fffff]);
var utf8sample = new Uint8Array(new Buffer(utf16sample));
console.log(utf16sample, utf16sample.length);
console.log(new Buffer(utf16sample));
it('Encode string to utf8 buf', function () {
assert.ok(cmp(
strings.string2buf(utf16sample),
utf8sample
));
});
it('Decode utf8 buf to string', function () {
assert.ok(strings.buf2string(utf8sample), utf16sample);
});
});
describe('Deflate strings', function () {
describe('Deflate/Inflate strings', function () {
var file = path.join(__dirname, 'fixtures/samples/lorem_utf_100k.txt');
var sampleString = fs.readFileSync(file, 'utf8');
var sampleArray = new Uint8Array(fs.readFileSync(file));
it('Deflate javascript string (utf16) on input', function () {
assert.ok(cmp(
@ -35,22 +80,18 @@ describe('Deflate strings', function () {
assert.ok(cmp(new Buffer(data, 'binary'), pako.deflate(sampleArray)));
});
});
describe('Inflate strings', function () {
var deflatedString = pako.deflate(sampleArray, { to: 'string' });
var deflatedArray = pako.deflate(sampleArray);
it('Inflate binary string input', function () {
var deflatedString = pako.deflate(sampleArray, { to: 'string' });
var deflatedArray = pako.deflate(sampleArray);
assert.ok(cmp(pako.inflate(deflatedString), pako.inflate(deflatedArray)));
});
it('Inflate with javascript string (utf16) output', function () {
var deflatedArray = pako.deflate(sampleArray);
var data = pako.inflate(deflatedArray, { to: 'string', chunkSize: 99 });
assert.equal(typeof data, 'string');
assert(data === sampleString);
assert.equal(data, sampleString);
});
});
});