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unishox2.js
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/*
* Copyright (C) 2020 Siara Logics (cc)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @author Arundale Ramanathan
*
*/
var USX_HCODES_DFLT = new Uint8Array([0x00, 0x40, 0x80, 0xC0, 0xE0]);
var USX_HCODE_LENS_DFLT = new Uint8Array([2, 2, 2, 3, 3]);
var USX_HCODES_ALPHA_NUM_SYM_ONLY = new Uint8Array([0x00, 0x80, 0xC0, 0x00, 0x00]);
var USX_HCODE_LENS_ALPHA_NUM_SYM_ONLY = new Uint8Array([1, 2, 2, 0, 0]);
var USX_FREQ_SEQ_DFLT = ["\": \"", "\": ", "</", "=\"", "\":\"", "://"];
var USX_TEMPLATES = ["tfff-of-tfTtf:rf:rf.fffZ", "tfff-of-tf", "(fff) fff-ffff", "tf:rf:rf", 0];
const magic = {byt: 0x80, bits: 1};
const USX_ALPHA = 0;
const USX_SYM = 1;
const USX_NUM = 2;
const USX_DICT = 3;
const USX_DELTA = 4;
var usx_sets = ["\0 etaoinsrlcdhupmbgwfyvkqjxz",
"\"{}_<>:\n\0[]\\;'\t@*&?!^|\r~`\0\0\0",
"\0,.01925-/34678() =+$%#\0\0\0\0\0"];
// Stores position of letter in usx_sets.
// First 3 bits - position in usx_hcodes
// Next 5 bits - position in usx_vcodes
var usx_code_94 = new Array(94);
var usx_vcodes = new Uint8Array(
[ 0x00, 0x40, 0x60, 0x80, 0x90, 0xA0, 0xB0,
0xC0, 0xD0, 0xD8, 0xE0, 0xE4, 0xE8, 0xEC,
0xEE, 0xF0, 0xF2, 0xF4, 0xF6, 0xF7, 0xF8,
0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF ]);
var usx_vcode_lens = new Uint8Array(
[ 2, 3, 3, 4, 4, 4, 4,
4, 5, 5, 6, 6, 6, 7,
7, 7, 7, 7, 8, 8, 8,
8, 8, 8, 8, 8, 8, 8 ]);
var usx_freq_codes = new Uint8Array([(1 << 5) + 25, (1 << 5) + 26, (1 << 5) + 27, (2 << 5) + 23, (2 << 5) + 24, (2 << 5) + 25]);
var NICE_LEN = 5;
const RPT_CODE = ((2 << 5) + 26);
const TERM_CODE = ((2 << 5) + 27);
const LF_CODE = ((1 << 5) + 7);
const CRLF_CODE = ((1 << 5) + 8);
const CR_CODE = ((1 << 5) + 22);
const TAB_CODE = ((1 << 5) + 14);
const NUM_SPC_CODE = ((2 << 5) + 17);
const UNI_STATE_SPL_CODE = 0xF8;
const UNI_STATE_SPL_CODE_LEN = 5;
const UNI_STATE_SW_CODE = 0x80;
const UNI_STATE_SW_CODE_LEN = 2;
const SW_CODE = 0;
const SW_CODE_LEN = 2;
/// Terminator bit sequence for Preset 1. Length varies depending on state as per following consts
const TERM_BYTE_PRESET_1 = 0;
/// Length of Terminator bit sequence when state is lower
const TERM_BYTE_PRESET_1_LEN_LOWER = 6;
/// Length of Terminator bit sequence when state is upper
const TERM_BYTE_PRESET_1_LEN_UPPER = 4;
const USX_OFFSET_94 = 33;
/// We almost never need the full terminator
const need_full_term_codes = 0;
// From: https://stackoverflow.com/a/24466476/5072621
// Note that size is the number of array elements to set,
// not the number of bytes.
function memset(array, val, size) {
for (var i = 0; i < size; ++i) {
array[i] = val;
}
}
var is_inited = 0;
function init_coder() {
if (is_inited)
return;
memset(usx_code_94, '\0', 94);
for (var i = 0; i < 3; i++) {
for (var j = 0; j < 28; j++) {
var c = usx_sets[i].charCodeAt(j);
if (c !== 0 && c > 32) {
usx_code_94[c - USX_OFFSET_94] = (i << 5) + j;
if (c >= 97 && c <= 122) // a - z
usx_code_94[c - USX_OFFSET_94 - (97 - 65)] = (i << 5) + j;
}
}
}
is_inited = 1;
}
var usx_mask = new Uint8Array([0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE, 0xFF]);
function append_bits(out, olen, ol, code, clen) {
var cur_bit;
var blen;
var a_byte;
var oidx;
//console.log(util.format("%d,%x,%d,%d\n", ol, code, clen, state));
while (clen > 0) {
cur_bit = ol % 8;
blen = clen;
a_byte = code & usx_mask[blen - 1];
a_byte >>= cur_bit;
if (blen + cur_bit > 8)
blen = (8 - cur_bit);
oidx = ol / 8;
if (oidx < 0 || olen <= oidx)
return -1;
if (cur_bit == 0)
out[ol >> 3] = a_byte;
else
out[ol >> 3] |= a_byte;
code <<= blen;
ol += blen;
clen -= blen;
}
return ol;
}
function append_switch_code(out, olen, ol, state) {
if (state == USX_DELTA) {
ol = append_bits(out, olen, ol, UNI_STATE_SPL_CODE, UNI_STATE_SPL_CODE_LEN);
ol = append_bits(out, olen, ol, UNI_STATE_SW_CODE, UNI_STATE_SW_CODE_LEN);
} else
ol = append_bits(out, olen, ol, SW_CODE, SW_CODE_LEN);
return ol;
}
function append_code(out, olen, ol, code, state, usx_hcodes, usx_hcode_lens) {
var hcode = code >> 5;
var vcode = code & 0x1F;
if (usx_hcode_lens[hcode] == 0 && hcode != USX_ALPHA)
return [ol, state];
switch (hcode) {
case USX_ALPHA:
if (state != USX_ALPHA) {
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_ALPHA], usx_hcode_lens[USX_ALPHA]);
state = USX_ALPHA;
}
break;
case USX_SYM:
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_SYM], usx_hcode_lens[USX_SYM]);
break;
case USX_NUM:
if (state != USX_NUM) {
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_NUM], usx_hcode_lens[USX_NUM]);
if (usx_sets[hcode].charCodeAt(vcode) >= 48 && usx_sets[hcode].charCodeAt(vcode) <= 57)
state = USX_NUM;
}
}
return [append_bits(out, olen, ol, usx_vcodes[vcode], usx_vcode_lens[vcode]), state];
}
const count_bit_lens = new Uint8Array([2, 4, 7, 11, 16]);
const count_adder = [4, 20, 148, 2196, 67732];
// First five bits are code and Last three bits of codes represent length
const count_codes = new Uint8Array([0x01, 0x82, 0xC3, 0xE4, 0xF4]);
function encodeCount(out, olen, ol, count) {
for (var i = 0; i < 5; i++) {
if (count < count_adder[i]) {
ol = append_bits(out, olen, ol, (count_codes[i] & 0xF8), count_codes[i] & 0x07);
var count16 = (count - (i > 0 ? count_adder[i - 1] : 0)) << (16 - count_bit_lens[i]);
if (count_bit_lens[i] > 8) {
ol = append_bits(out, olen, ol, count16 >> 8, 8);
ol = append_bits(out, olen, ol, count16 & 0xFF, count_bit_lens[i] - 8);
} else
ol = append_bits(out, olen, ol, count16 >> 8, count_bit_lens[i]);
return ol;
}
}
return ol;
}
const uni_bit_len = new Uint8Array([6, 12, 14, 16, 21]);
const uni_adder = [0, 64, 4160, 20544, 86080];
function encodeUnicode(out, olen, ol, code, prev_code) {
// First five bits are code and Last three bits of codes represent length
//const byte codes[8] = {0x00, 0x42, 0x83, 0xA3, 0xC3, 0xE4, 0xF5, 0xFD};
const codes = new Uint8Array([0x01, 0x82, 0xC3, 0xE4, 0xF5, 0xFD]);
var till = 0;
var orig_ol = ol;
var diff = code - prev_code;
if (diff < 0)
diff = -diff;
//printf("%ld, ", code);
//printf("Diff: %d\n", diff);
for (var i = 0; i < 5; i++) {
till += (1 << uni_bit_len[i]);
if (diff < till) {
ol = append_bits(out, olen, ol, (codes[i] & 0xF8), codes[i] & 0x07);
//if (diff) {
ol = append_bits(out, olen, ol, prev_code > code ? 0x80 : 0, 1);
var val = diff - uni_adder[i];
//printf("Val: %d\n", val);
if (uni_bit_len[i] > 16) {
val <<= (24 - uni_bit_len[i]);
ol = append_bits(out, olen, ol, val >> 16, 8);
ol = append_bits(out, olen, ol, (val >> 8) & 0xFF, 8);
ol = append_bits(out, olen, ol, val & 0xFF, uni_bit_len[i] - 16);
} else
if (uni_bit_len[i] > 8) {
val <<= (16 - uni_bit_len[i]);
ol = append_bits(out, olen, ol, val >> 8, 8);
ol = append_bits(out, olen, ol, val & 0xFF, uni_bit_len[i] - 8);
} else {
val <<= (8 - uni_bit_len[i]);
ol = append_bits(out, olen, ol, val & 0xFF, uni_bit_len[i]);
}
//}
//printf("bits:%d\n", ol-orig_ol);
return ol;
}
}
return ol;
}
function readUTF8(input, len, l) {
var ret = 0;
if (typeof(input) == 'string') {
ret = input.codePointAt(l);
return [ret, ret === input.charCodeAt(l) ? 1 : 2];
}
var utf8len = 0;
if (l < (len - 1) && (input[l] & 0xE0) == 0xC0 && (input[l + 1] & 0xC0) == 0x80) {
utf8len = 2;
ret = (input[l] & 0x1F);
ret <<= 6;
ret += (input[l + 1] & 0x3F);
if (ret < 0x80)
ret = 0;
} else
if (l < (len - 2) && (input[l] & 0xF0) == 0xE0 && (input[l + 1] & 0xC0) == 0x80
&& (input[l + 2] & 0xC0) == 0x80) {
utf8len = 3;
ret = (input[l] & 0x0F);
ret <<= 6;
ret += (input[l + 1] & 0x3F);
ret <<= 6;
ret += (input[l + 2] & 0x3F);
if (ret < 0x0800)
ret = 0;
} else
if (l < (len - 3) && (input[l] & 0xF8) == 0xF0 && (input[l + 1] & 0xC0) == 0x80
&& (input[l + 2] & 0xC0) == 0x80 && (input[l + 3] & 0xC0) == 0x80) {
utf8len = 4;
ret = (input[l] & 0x07);
ret <<= 6;
ret += (input[l + 1] & 0x3F);
ret <<= 6;
ret += (input[l + 2] & 0x3F);
ret <<= 6;
ret += (input[l + 3] & 0x3F);
if (ret < 0x10000)
ret = 0;
}
return [ret, utf8len];
}
function matchOccurance(input, len, l, out, olen, ol, state, usx_hcodes, usx_hcode_lens) {
var j, k;
var longest_dist = 0;
var longest_len = 0;
for (j = l - NICE_LEN; j >= 0; j--) {
for (k = l; k < len && j + k - l < l; k++) {
if (input[k] != input[j + k - l])
break;
}
while ((input[k] >> 6) == 2)
k--; // Skip partial UTF-8 matches
//if ((in[k - 1] >> 3) == 0x1E || (in[k - 1] >> 4) == 0x0E || (in[k - 1] >> 5) == 0x06)
// k--;
if (k - l > NICE_LEN - 1) {
var match_len = k - l - NICE_LEN;
var match_dist = l - j - NICE_LEN + 1;
if (match_len > longest_len) {
longest_len = match_len;
longest_dist = match_dist;
}
}
}
if (longest_len > 0) {
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_DICT], usx_hcode_lens[USX_DICT]);
//printf("Len:%d / Dist:%d\n", longest_len, longest_dist);
ol = encodeCount(out, olen, ol, longest_len);
ol = encodeCount(out, olen, ol, longest_dist);
l += (longest_len + NICE_LEN);
l--;
return [l, ol];
}
return [-l, ol];
}
function matchLine(input, len, l, out, olen, ol, prev_lines, prev_lines_idx, state, usx_hcodes, usx_hcode_lens) {
var last_ol = ol;
var last_len = 0;
var last_dist = 0;
var last_ctx = 0;
var line_ctr = 0;
var j = 0;
do {
var i, k;
var prev_line = prev_lines[prev_lines_idx - line_ctr];
var line_len = prev_line.length;
var limit = (line_ctr == 0 ? l : line_len);
for (; j < limit; j++) {
for (i = l, k = j; k < line_len && k < limit && i < len; k++, i++) {
if (prev_line[k] !== input[i])
break;
}
while ((prev_line[k] >> 6) == 2)
k--; // Skip partial UTF-8 matches
if ((k - j) >= NICE_LEN) {
if (last_len > 0) {
if (j > last_dist)
continue;
//int saving = ((k - j) - last_len) + (last_dist - j) + (last_ctx - line_ctr);
//if (saving < 0) {
// //printf("No savng: %d\n", saving);
// continue;
//}
ol = last_ol;
}
last_len = (k - j);
last_dist = j;
last_ctx = line_ctr;
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_DICT], usx_hcode_lens[USX_DICT]);
ol = encodeCount(out, olen, ol, last_len - NICE_LEN);
ol = encodeCount(out, olen, ol, last_dist);
ol = encodeCount(out, olen, ol, last_ctx);
/*
if ((*ol - last_ol) > (last_len * 4)) {
last_len = 0;
*ol = last_ol;
}*/
//printf("Len: %d, Dist: %d, Line: %d\n", last_len, last_dist, last_ctx);
j += last_len;
}
}
} while (line_ctr++ < prev_lines_idx);
if (last_len > 0) {
l += last_len;
l--;
return [l, ol];
}
return [-l, ol];
}
function getBaseCode(ch) {
if (ch >= 48 && ch <= 57)
return (ch - 48) << 4;
else if (ch >= 65 && ch <= 70)
return (ch - 65 + 10) << 4;
else if (ch >= 97 && ch <= 102)
return (ch - 97 + 10) << 4;
return 0;
}
const USX_NIB_NUM = 0;
const USX_NIB_HEX_LOWER = 1;
const USX_NIB_HEX_UPPER = 2;
const USX_NIB_NOT = 3;
function getNibbleType(ch) {
if (ch >= 48 && ch <= 57)
return USX_NIB_NUM;
else if (ch >= 97 && ch <= 102)
return USX_NIB_HEX_LOWER;
else if (ch >= 65 && ch <= 70)
return USX_NIB_HEX_UPPER;
return USX_NIB_NOT;
}
function append_nibble_escape(out, olen, ol, state, usx_hcodes, usx_hcode_lens) {
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_NUM], usx_hcode_lens[USX_NUM]);
ol = append_bits(out, olen, ol, 0, 2);
return ol;
}
/// Appends the terminator code depending on the state, preset and whether full terminator needs to be encoded to out or not \n
function append_final_bits(out, olen, ol, state, is_all_upper, usx_hcodes, usx_hcode_lens) {
if (usx_hcode_lens[USX_ALPHA]) {
if (USX_NUM != state) {
// for num state, append TERM_CODE directly
// for other state, switch to Num Set first
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_NUM], usx_hcode_lens[USX_NUM]);
}
ol = append_bits(out, olen, ol, usx_vcodes[TERM_CODE & 0x1F], usx_vcode_lens[TERM_CODE & 0x1F]);
} else {
// preset 1, terminate at 2 or 3 SW_CODE, i.e., 4 or 6 continuous 0 bits
// see discussion: https://github.com/siara-cc/Unishox/issues/19#issuecomment-922435580
ol = append_bits(out, olen, ol, TERM_BYTE_PRESET_1, is_all_upper ? TERM_BYTE_PRESET_1_LEN_UPPER : TERM_BYTE_PRESET_1_LEN_LOWER);
}
// fill byte with the last bit
ol = append_bits(out, olen, ol, (ol == 0 || out[(ol-1)/8] << ((ol-1)&7) >= 0) ? 0 : 0xFF, (8 - ol % 8) & 7);
return ol;
}
function compare_arr(arr1, arr2, is_str) {
if (is_str)
return arr1 === arr2;
else {
if (arr1.length !== arr2.length)
return false;
for (var i = 0; i < arr2.length; i++) {
if (arr1.charCodeAt(i) !== arr2[i])
return false;
}
}
return true;
}
const usx_spl_code = new Uint8Array([0, 0xE0, 0xC0, 0xF0]);
const usx_spl_code_len = new Uint8Array([1, 4, 3, 4]);
function unishox2_compress(input, len, out, usx_hcodes, usx_hcode_lens, usx_freq_seq, usx_templates) {
var state;
var l, ll, ol;
var c_in, c_next;
var prev_uni;
var is_upper, is_all_upper;
var prev_lines_arr = null;
var prev_lines_idx;
// if compressing an element in an array, pass the array as input
// and index of the array to be decompressed in len
if (input instanceof Array) {
prev_lines_arr = input;
prev_lines_idx = len;
input = prev_lines_arr[prev_lines_idx];
len = input.length;
}
var olen = out.length;
var is_str = (typeof(input) == "string");
init_coder();
ol = 0;
prev_uni = 0;
state = USX_ALPHA;
is_all_upper = false;
console.log(magic.byt);
console.log(magic.bits);
ol = append_bits(out, olen, ol, magic.byt, magic.bits);
for (l=0; l<len; l++) {
if (usx_hcode_lens[USX_DICT] > 0 && l < (len - NICE_LEN + 1)) {
if (prev_lines_arr !== undefined && prev_lines_arr != null) {
[l, ol] = matchLine(input, len, l, out, olen, ol, prev_lines_arr, prev_lines_idx, state, usx_hcodes, usx_hcode_lens);
if (l > 0) {
continue;
} else if (l < 0 && ol < 0) {
return olen + 1;
}
l = -l;
} else {
[l, ol] = matchOccurance(input, len, l, out, olen, ol, state, usx_hcodes, usx_hcode_lens);
if (l > 0) {
continue;
} else if (l < 0 && ol < 0) {
return olen + 1;
}
l = -l;
}
}
c_in = input[l];
if (l > 0 && len > 4 && l < len - 4 && usx_hcode_lens[USX_NUM] > 0 && c_in <= (is_str ? '~' : 126)) {
if (c_in == input[l - 1] && c_in == input[l + 1] && c_in == input[l + 2] &&
c_in == input[l + 3]) {
var rpt_count = l + 4;
while (rpt_count < len && input[rpt_count] == c_in)
rpt_count++;
rpt_count -= l;
[ol, state] = append_code(out, olen, ol, RPT_CODE, state, usx_hcodes, usx_hcode_lens);
ol = encodeCount(out, olen, ol, rpt_count - 4);
l += rpt_count;
l--;
continue;
}
}
if (l <= (len - 36) && usx_hcode_lens[USX_NUM] > 0) {
var hyp_code = (is_str ? '-' : 45);
var hex_type = USX_NIB_NUM;
if (input[l + 8] === hyp_code && input[l + 13] === hyp_code
&& input[l + 18] === hyp_code && input[l + 23] === hyp_code) {
var uid_pos = l;
for (; uid_pos < l + 36; uid_pos++) {
var c_uid = (is_str ? input.charCodeAt(uid_pos) : input[uid_pos]);
if (c_uid === 45 && (uid_pos == 8 || uid_pos == 13 || uid_pos == 18 || uid_pos == 23))
continue;
var nib_type = getNibbleType(c_uid);
if (nib_type == USX_NIB_NOT)
break;
if (nib_type != USX_NIB_NUM) {
if (hex_type != USX_NIB_NUM && hex_type != nib_type)
break;
hex_type = nib_type;
}
}
if (uid_pos == l + 36) {
ol = append_nibble_escape(out, olen, ol, state, usx_hcodes, usx_hcode_lens);
ol = append_bits(out, olen, ol, (hex_type == USX_NIB_HEX_LOWER ? 0xC0 : 0xF0),
(hex_type == USX_NIB_HEX_LOWER ? 3 : 5));
for (uid_pos = l; uid_pos < l + 36; uid_pos++) {
var c_uid = (is_str ? input.charCodeAt(uid_pos) : input[uid_pos]);
if (c_uid !== 45) // '-'
ol = append_bits(out, olen, ol, getBaseCode(c_uid), 4);
}
//printf("GUID:\n");
l += 35;
continue;
}
}
}
if (l < (len - 5) && usx_hcode_lens[USX_NUM] > 0) {
var hex_type = USX_NIB_NUM;
var hex_len = 0;
do {
var c_uid = (is_str ? input.charCodeAt(l + hex_len) : input[l + hex_len]);
var nib_type = getNibbleType(c_uid);
if (nib_type == USX_NIB_NOT)
break;
if (nib_type != USX_NIB_NUM) {
if (hex_type != USX_NIB_NUM && hex_type != nib_type)
break;
hex_type = nib_type;
}
hex_len++;
} while (l + hex_len < len);
if (hex_len > 10 && hex_type == USX_NIB_NUM)
hex_type = USX_NIB_HEX_LOWER;
if ((hex_type == USX_NIB_HEX_LOWER || hex_type == USX_NIB_HEX_UPPER) && hex_len > 3) {
ol = append_nibble_escape(out, olen, ol, state, usx_hcodes, usx_hcode_lens);
ol = append_bits(out, olen, ol, (hex_type == USX_NIB_HEX_LOWER ? 0x80 : 0xE0), (hex_type == USX_NIB_HEX_LOWER ? 2 : 4));
ol = encodeCount(out, olen, ol, hex_len);
do {
var c_uid = (is_str ? input.charCodeAt(l) : input[l]);
ol = append_bits(out, olen, ol, getBaseCode(c_uid), 4);
l++;
} while (--hex_len > 0);
l--;
continue;
}
}
if (usx_templates != null && usx_templates != undefined) {
var i;
for (i = 0; i < 5; i++) {
if (typeof(usx_templates[i]) == 'string') {
var rem = usx_templates[i].length;
var j = 0;
for (; j < rem && l + j < len; j++) {
var c_t = usx_templates[i][j];
c_in = (is_str ? input.charCodeAt(l + j) : input[l + j]);
if (c_t === 'f' || c_t === 'F') {
if (getNibbleType(c_in) != (c_t === 'f' ? USX_NIB_HEX_LOWER : USX_NIB_HEX_UPPER)
&& getNibbleType(c_in) != USX_NIB_NUM) {
break;
}
} else
if (c_t === 'r' || c_t === 't' || c_t === 'o') {
// if c_in does not fall into the number range
if (c_in < 48 || c_in > (c_t === 'r' ? 55 : (c_t === 't' ? 51 : 49)))
break;
} else
if (c_t.charCodeAt(0) !== c_in)
break;
}
if ((j / rem) > 0.66) {
//printf("%s\n", usx_templates[i]);
rem = rem - j;
ol = append_nibble_escape(out, olen, ol, state, usx_hcodes, usx_hcode_lens);
ol = append_bits(out, olen, ol, 0, 1);
ol = append_bits(out, olen, ol, (count_codes[i] & 0xF8), count_codes[i] & 0x07);
ol = encodeCount(out, olen, ol, rem);
for (var k = 0; k < j; k++) {
var c_t = usx_templates[i][k];
c_in = (is_str ? input.charCodeAt(l + k) : input[l + k]);
if (c_t === 'f' || c_t === 'F') {
ol = append_bits(out, olen, ol, getBaseCode(c_in), 4);
} else if (c_t === 'r' || c_t === 't' || c_t === 'o') {
c_t = (c_t === 'r' ? 3 : (c_t === 't' ? 2 : 1));
ol = append_bits(out, olen, ol, (c_in - 48) << (8 - c_t), c_t);
}
}
l += j;
l--;
break;
}
}
}
if (i < 5)
continue;
}
if (usx_freq_seq != null) {
var i;
for (i = 0; i < 6; i++) {
var seq_len = usx_freq_seq[i].length;
if (len - seq_len >= 0 && l <= len - seq_len) {
if (usx_hcode_lens[usx_freq_codes[i] >> 5] &&
compare_arr(usx_freq_seq[i].slice(0, seq_len), input.slice(l, l + seq_len), is_str)) {
[ol, state] = append_code(out, olen, ol, usx_freq_codes[i], state, usx_hcodes, usx_hcode_lens);
l += seq_len;
l--;
break;
}
}
}
if (i < 6)
continue;
}
c_in = (is_str ? input.charCodeAt(l) : input[l]);
is_upper = false;
if (c_in >= 65 && c_in <= 90) // A-Z
is_upper = true;
else {
if (is_all_upper) {
is_all_upper = false;
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_ALPHA], usx_hcode_lens[USX_ALPHA]);
state = USX_ALPHA;
}
}
if (is_upper && !is_all_upper) {
if (state == USX_NUM) {
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_ALPHA], usx_hcode_lens[USX_ALPHA]);
state = USX_ALPHA;
}
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_ALPHA], usx_hcode_lens[USX_ALPHA]);
if (state == USX_DELTA) {
state = USX_ALPHA;
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_ALPHA], usx_hcode_lens[USX_ALPHA]);
}
}
c_next = 0;
if (l+1 < len)
c_next = (is_str ? input.charCodeAt(l + 1) : input[l + 1]);
if (c_in >= 32 && c_in <= 126) { // ' ' to '~'
if (is_upper && !is_all_upper) {
for (ll=l+4; ll>=l && ll<len; ll--) {
var c_u = (is_str ? input.charCodeAt(ll) : input[ll]);
if (c_u < 65 || c_u > 90) // ~ A-Z
break;
}
if (ll == l-1) {
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_ALPHA], usx_hcode_lens[USX_ALPHA]);
state = USX_ALPHA;
is_all_upper = true;
}
}
if (state == USX_DELTA) {
var ch_idx = " .,".indexOf(String.fromCharCode(c_in));
if (ch_idx != -1) {
ol = append_bits(out, olen, ol, UNI_STATE_SPL_CODE, UNI_STATE_SPL_CODE_LEN);
ol = append_bits(out, olen, ol, usx_spl_code[ch_idx], usx_spl_code_len[ch_idx]);
continue;
}
}
c_in -= 32;
if (is_all_upper && is_upper)
c_in += 32;
if (c_in === 0) {
if (state == USX_NUM)
ol = append_bits(out, olen, ol, usx_vcodes[NUM_SPC_CODE & 0x1F], usx_vcode_lens[NUM_SPC_CODE & 0x1F]);
else
ol = append_bits(out, olen, ol, usx_vcodes[1], usx_vcode_lens[1]);
} else {
c_in = c_in - 1;
[ol, state] = append_code(out, olen, ol, usx_code_94[c_in], state, usx_hcodes, usx_hcode_lens);
}
} else
if (c_in === 13 && c_next === 10) {
[ol, state] = append_code(out, olen, ol, CRLF_CODE, state, usx_hcodes, usx_hcode_lens);
l++;
} else
if (c_in === 10) {
if (state == USX_DELTA) {
ol = append_bits(out, olen, ol, UNI_STATE_SPL_CODE, UNI_STATE_SPL_CODE_LEN);
ol = append_bits(out, olen, ol, 0xF0, 4);
} else
[ol, state] = append_code(out, olen, ol, LF_CODE, state, usx_hcodes, usx_hcode_lens);
} else
if (c_in === 13) {
[ol, state] = append_code(out, olen, ol, CR_CODE, state, usx_hcodes, usx_hcode_lens);
} else
if (c_in === 9) {
[ol, state] = append_code(out, olen, ol, TAB_CODE, state, usx_hcodes, usx_hcode_lens);
} else {
var uni, utf8len, uni2;
[uni, utf8len] = readUTF8(input, len, l);
if (uni > 0) {
l += utf8len;
if (state != USX_DELTA) {
[uni2, utf8len] = readUTF8(input, len, l);
if (uni2 > 0) {
if (state != USX_ALPHA) {
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_ALPHA], usx_hcode_lens[USX_ALPHA]);
}
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_ALPHA], usx_hcode_lens[USX_ALPHA]);
ol = append_bits(out, olen, ol, usx_vcodes[1], usx_vcode_lens[1]); // code for space (' ')
state = USX_DELTA;
} else {
ol = append_switch_code(out, olen, ol, state);
ol = append_bits(out, olen, ol, usx_hcodes[USX_DELTA], usx_hcode_lens[USX_DELTA]);
}
}
ol = encodeUnicode(out, olen, ol, uni, prev_uni);
//console.log("%d:%d:%d,", l, utf8len, uni);
prev_uni = uni;
l--;
} else {
var bin_count = 1;
for (var bi = l + 1; bi < len; bi++) {
var c_bi = input[bi];
//if (c_bi > 0x1F && c_bi != 0x7F)
// break;
if (readUTF8(input, len, bi) > 0)
break;
if (bi < (len - 4) && c_bi === input[bi - 1] && c_bi === input[bi + 1]
&& c_bi === input[bi + 2] && c_bi === input[bi + 3])
break;
bin_count++;
}
//printf("Bin:%d:%d:%x:%d\n", l, (unsigned char) c_in, (unsigned char) c_in, bin_count);
ol = append_nibble_escape(out, olen, ol, state, usx_hcodes, usx_hcode_lens);
ol = append_bits(out, olen, ol, 0xF8, 5);
ol = encodeCount(out, olen, ol, bin_count);
do {
ol = append_bits(out, olen, ol, input[l++], 8);
} while (--bin_count > 0);
l--;
}
}
}
if (need_full_term_codes) {
var orig_ol = ol;
ol = append_final_bits(out, olen, ol, state, is_all_upper, usx_hcodes, usx_hcode_lens);
return (ol / 8) * 4 + (((ol-orig_ol)/8) & 3);
} else {
var rst = (ol + 7) / 8;
ol = append_final_bits(out, rst, ol, state, is_all_upper, usx_hcodes, usx_hcode_lens);
return rst;
}
}
function unishox2_compress_simple(input, len, out) {
return unishox2_compress(input, len, out, USX_HCODES_DFLT, USX_HCODE_LENS_DFLT, USX_FREQ_SEQ_DFLT, USX_TEMPLATES);
}
function readBit(input, bit_no) {
return input[bit_no >> 3] & (0x80 >> (bit_no % 8));
}
function read8bitCode(input, len, bit_no) {
var bit_pos = bit_no & 0x07;
var char_pos = bit_no >> 3;
len >>= 3;
var code = (input[char_pos] << bit_pos) & 0xFF;
char_pos++;
if (char_pos < len) {
code |= input[char_pos] >> (8 - bit_pos);
} else
code |= (0xFF >> (8 - bit_pos));
return [code, bit_no];
}
// Decoder is designed for using less memory, not speed
const SECTION_COUNT = 5;
const usx_vsections = new Uint8Array([0x7F, 0xBF, 0xDF, 0xEF, 0xFF]);
const usx_vsection_pos = new Uint8Array([0, 4, 8, 12, 20]);
const usx_vsection_mask = new Uint8Array([0x7F, 0x3F, 0x1F, 0x0F, 0x0F]);
const usx_vsection_shift = new Uint8Array([5, 4, 3, 1, 0]);
// Vertical decoder lookup table - 3 bits code len, 5 bytes vertical pos
// code len is one less as 8 cannot be accommodated in 3 bits
const usx_vcode_lookup = new Uint8Array([
(1 << 5) + 0, (1 << 5) + 0, (2 << 5) + 1, (2 << 5) + 2, // Section 1
(3 << 5) + 3, (3 << 5) + 4, (3 << 5) + 5, (3 << 5) + 6, // Section 2
(3 << 5) + 7, (3 << 5) + 7, (4 << 5) + 8, (4 << 5) + 9, // Section 3
(5 << 5) + 10, (5 << 5) + 10, (5 << 5) + 11, (5 << 5) + 11, // Section 4
(5 << 5) + 12, (5 << 5) + 12, (6 << 5) + 13, (6 << 5) + 14,
(6 << 5) + 15, (6 << 5) + 15, (6 << 5) + 16, (6 << 5) + 16, // Section 5
(6 << 5) + 17, (6 << 5) + 17, (7 << 5) + 18, (7 << 5) + 19,
(7 << 5) + 20, (7 << 5) + 21, (7 << 5) + 22, (7 << 5) + 23,
(7 << 5) + 24, (7 << 5) + 25, (7 << 5) + 26, (7 << 5) + 27
]);
function readVCodeIdx(input, len, bit_no) {
if (bit_no < len) {
var code;
[code, bit_no] = read8bitCode(input, len, bit_no);
var i = 0;
do {
if (code <= usx_vsections[i]) {
var vcode = usx_vcode_lookup[usx_vsection_pos[i] + ((code & usx_vsection_mask[i]) >> usx_vsection_shift[i])];
bit_no += ((vcode >> 5) + 1);
if (bit_no > len)
return [99, bit_no];
return [vcode & 0x1F, bit_no];
}
} while (++i < SECTION_COUNT);
}
return [99, bit_no];
}
const len_masks = new Uint8Array([0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE, 0xFF]);
function readHCodeIdx(input, len, bit_no, usx_hcodes, usx_hcode_lens) {
if (!usx_hcode_lens[USX_ALPHA])
return [USX_ALPHA, bit_no];
if (bit_no < len) {
var code;
[code, bit_no] = read8bitCode(input, len, bit_no);
for (var code_pos = 0; code_pos < 5; code_pos++) {
if (usx_hcode_lens[code_pos] > 0 && (code & len_masks[usx_hcode_lens[code_pos] - 1]) == usx_hcodes[code_pos]) {
bit_no += usx_hcode_lens[code_pos];
return [code_pos, bit_no];
}
}
}
return [99, bit_no];
}
// TODO: Last value check.. Also len check in readBit
function getStepCodeIdx(input, len, bit_no, limit) {
var idx = 0;
while (bit_no < len && readBit(input, bit_no) > 0) {
idx++;
bit_no++;
if (idx == limit)
return [idx, bit_no];
}
if (bit_no >= len)
return [99, bit_no];
bit_no++;
return [idx, bit_no];
}
function getNumFromBits(input, len, bit_no, count) {
var ret = 0;
while (count-- > 0 && bit_no < len) {
ret += (readBit(input, bit_no) > 0 ? 1 << count : 0);
bit_no++;
}
return count < 0 ? ret : -1;
}
function readCount(input, bit_no, len) {
var idx = 0;
[idx, bit_no] = getStepCodeIdx(input, len, bit_no, 4);
if (idx == 99)
return [-1, bit_no];
if (bit_no + count_bit_lens[idx] - 1 >= len)
return [-1, bit_no];
var count = getNumFromBits(input, len, bit_no, count_bit_lens[idx]) + (idx > 0 ? count_adder[idx - 1] : 0);
bit_no += count_bit_lens[idx];
return [count, bit_no];
}
function readUnicode(input, bit_no, len) {
var idx = 0;
[idx, bit_no] = getStepCodeIdx(input, len, bit_no, 5);
if (idx == 99)
return [0x7FFFFF00 + 99, bit_no];
if (idx == 5) {
[idx, bit_no] = getStepCodeIdx(input, len, bit_no, 4);
return [0x7FFFFF00 + idx, bit_no];
}
if (idx >= 0) {
var sign = (bit_no < len ? readBit(input, bit_no) : 0);
bit_no++;
if (bit_no + uni_bit_len[idx] - 1 >= len)
return [0x7FFFFF00 + 99, bit_no];
var count = getNumFromBits(input, len, bit_no, uni_bit_len[idx]);
count += uni_adder[idx];
bit_no += uni_bit_len[idx];
//printf("Sign: %d, Val:%d", sign, count);
return [sign > 0 ? -count : count, bit_no];
}
return [0, bit_no];
}
function decodeRepeatArray(input, len, out_arr, out, bit_no, prev_lines_arr, prev_lines_idx,
usx_hcodes, usx_hcode_lens, usx_freq_seq, usx_templates) {
var dict_len = 0;
[dict_len, bit_no] = readCount(input, bit_no, len);
dict_len += NICE_LEN;
if (dict_len < NICE_LEN)
return [-1, out];
var dist = 0;
[dist, bit_no] = readCount(input, bit_no, len);
if (dist < 0)
return [-1, out];
var ctx = 0;
[ctx, bit_no] = readCount(input, bit_no, len);
if (ctx < 0)
return [-1, out];
var line;
if (ctx == 0)
line = (out_arr == null ? out : out_arr);
else {
if (prev_lines_idx < ctx)
return [-1, out];
if (out_arr == null) {
line = unishox2_decompress(prev_lines_arr, prev_lines_idx - ctx, null,
usx_hcodes, usx_hcode_lens, usx_freq_seq, usx_templates);
} else {
line = new Uint8Array((dist + dict_len) * 2);
unishox2_decompress(prev_lines_arr, prev_lines_idx - ctx, line,
usx_hcodes, usx_hcode_lens, usx_freq_seq, usx_templates);
}
}
if (out_arr == null) {
out += (typeof(line) == "string" ? line.substr(dist, dict_len) : line.slice(dist, dict_len));
} else {
for (var i = 0; i < dict_len; i++) {
if (out >= out_arr.length)
break;
out_arr[out] = line[dist + i];
out++;
}
}
return [bit_no, out];
}
function decodeRepeat(input, len, out_arr, out, bit_no) {
var dict_len = 0;
[dict_len, bit_no] = readCount(input, bit_no, len);
dict_len += NICE_LEN;
if (dict_len < NICE_LEN)
return [-1, out];
var dist = 0;
[dist, bit_no] = readCount(input, bit_no, len);
dist += (NICE_LEN - 1);
if (dist < NICE_LEN - 1)
return [-1, out];
//console.log("Decode len: %d, dist: %d\n", dict_len - NICE_LEN, dist - NICE_LEN + 1);
if (out_arr == null) {
if (out.length < dist)
return [-1, out];
out += out.substr(out.length - dist, dict_len);
} else {
for (var i = 0; i < dict_len; i++) {
if (out >= out_arr.length)
break;
out_arr[out] = out_arr[out - dist];
out++;
}
}
return [bit_no, out];
}