mirror of
https://github.com/horsicq/Detect-It-Easy.git
synced 2026-06-24 01:54:08 +00:00
df5e077485
- once again reverting the db/read autoformatting; - audio.1.sg: Imago Orpheus .IMG rewritten, info-ed more and ripper-ready
820 lines
No EOL
40 KiB
Text
820 lines
No EOL
40 KiB
Text
// Supplemental read functions.
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// Authors: unknown guy, Kaens (TG @kaens)
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// Lots of legacy,
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// TODO update the old scripts to use the new functions,
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// and get rid of the functions themselves
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/* beautify ignore:start */
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var _BE = true, _LE = false; //endianness for read_int16+
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//little-endian = reversed notation (Intel, ZX Spectrum),
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//big-endian = direct notation (TCP/IP, Motorola, Amiga)
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//For the BitReader Object, BE is MSB and LE is LSB (intuitively)
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var CS_ALL = true, CS_BEST = false; //charStat needall
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var FINT_QUICK = FINT_FAST = FINT_1 = true; //findIntersections: find just one for speed's sake
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var TOEOF = -1; //use for the size parameter in findSignature
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// ---------- START OF PRE-v3.06 CODE --------------------
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/**
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* Read a big-endian word.
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* @param {UInt} nOffset - The offset in the file.
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* @returns {UShort} The word value.
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* @alias Binary.readBEWord
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*/
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File.readBEWord = function(nOffset) { return X.U16(nOffset,_BE) }
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/**
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* Read a big-endian dword.
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* @param {UInt} nOffset - The offset in the file.
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* @returns {UInt} The dword value.
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* @alias Binary.readBEDword
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*/
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File.readBEDword = function(nOffset) { return X.U32(nOffset,_BE) }
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/**
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* Read a word, selecting endianness.
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* @param {UInt} nOffset - The offset in the file.
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* @param {Bool} bBE - True for big-endian.
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* @returns {UShort} The word value.
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* @alias Binary.readEWord
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*/
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File.readEWord = function(nOffset,bBE) { return X.U16(nOffset,bBE) }
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/**
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* Read a dword, selecting endianness.
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* @param {UInt} nOffset - The offset in the file.
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* @param {Bool} bBE - True for big-endian.
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* @returns {UInt} The dword value.
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* @alias Binary.readEDWord
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*/
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File.readEDword = function(nOffset,bBE) { return X.U16(nOffset,bBE) }
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/**
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* Read a short (signed 16-bit) value.
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* @param {UInt} nOffset - The offset in the file.
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* @returns {Short} The short value.
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* @alias Binary.readShort
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*/
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File.readShort = function(nOffset) { return X.I16(nOffset,_LE) }
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// -------- END OF PRE-v3.06 CODE
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// The encoding tables start with 7F, not 80! 7F is undefined in many charsets but it's good to have something
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// The N(on)B(reakable)SP(ace) and S(oft)HY(phen) are kept as actual A0 and AD characters in this file
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var CP437 = "⌂"+
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"ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜ¢£¥₧ƒ"+
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"áíóúñѪº¿⌐¬½¼¡«»░▒▓│┤╡╢╖╕╣║╗╝╜╛┐"+
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"└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀"+
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"αßΓπΣσµτΦΘΩδ∞φε∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²■ ",
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CP866 = "⌂"+ //DOS Cyrillic
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'АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ'+
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'абвгдежзийклмноп░▒▓│┤╡╢╖╕╣║╗╝╜╛┐'+
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'└┴┬├─┼╞╟╚╔╩╦╠═╬╧╨╤╥╙╘╒╓╫╪┘┌█▄▌▐▀'+
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'рстуфхцчшщъыьэюяЁёЄєЇїЎў°∙·√№¤■ ',
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CP1251 = "⌂"+
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"ЂЃ‚ѓ„…†‡€‰Љ‹ЊЌЋЏђ‘’“”•–—・™љ›њќћџ"+
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" ЎўЈ¤Ґ¦§Ё©Є«¬®Ї°±Ііґµ¶·ё№є»јЅѕї"+
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"АБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ"+
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"абвгдежзийклмнопрстуфхцчшщъыьэюя",
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CP1252 = "⌂"+ //aka. Western aka. ISO-8859-1
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"€・‚ƒ„…†‡ˆ‰Š‹Œ・Ž・・‘’“”•–—˜™š›œ・žŸ"+
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" ¡¢£¤¥¦§¨©ª«¬・®¯°±²³´µ¶·¸¹º»¼½¾¿"+
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"ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞß"+
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"àáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ",
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KOI8R = "⌂"+ //aka. RFC 1489, Morse code based
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'─│┌┐└┘├┤┬┴┼▀▄█▌▐░▒▓⌠■∙√≈≤≥ ⌡°²·÷'+
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'═║╒ё╓╔╕╖╗╘╙╚╛╜╝╞╟╠╡Ё╢╣╤╥╦╧╨╩╪╫╬©'+
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'юабцдефгхийклмнопярстужвьызшэщчъ'+
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'ЮАБЦДЕФГХИЙКЛМНОПЯРСТУЖВЬЫЗШЭЩЧЪ',
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JISX0201 = "⌂"+
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"→-‚ƒ„…†‡ˆ‰Š‹Œ↑Ž³™‘’“”•–—˜™š›œ¢žŸ"+ //decided to mix it with cp1252
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"→｡｢｣､･ｦｧｨｩｪｫｬｭｮｯｰｱｲｳｴｶｷｸｹｺｻｼｽｾｿﾀ"+
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"ﾁﾂﾃﾄﾅﾆﾇﾈﾉﾊﾋﾌﾍﾎﾏﾐﾑﾒﾓﾔﾕﾖﾗﾘﾙﾚﾛﾜﾝﾞﾟ"+
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"àáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ",
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CPAmiga = "⫽"+ // alternatively, "▒""
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"абвгдежзийклмнопрстуфхцчшщъыьэюя"+ //0x80~0x9F display Cyrillics, just to fill the void
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" ¡¢£¤¥¦§¨©ª«¬–®¯°±²³´µ¶·¸¹º»¼½¾¿"+
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"ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞß"+
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"àáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ",
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CPRISCOS = "⌂"+
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"€Ŵŵ◰﯀Ŷŷ<C5B6>⇦⇨⇩⇧…™‰•‘’‹›“”„–—−Œœ†‡fifl"+
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" ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿"+
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"ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞß"+
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"àáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ",
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CPATASCII = ['▶',
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'🖤','├','▊','┘','┤','┐','╱','╲','◤','▛','◥','▙','▟','▆','￣',
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'▜','♣','┌','─','┼','◘','▀','▐','┬','┴','▐','└','\n','↑','↓','←','→',
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'█','！','”','＃','＄','％','＆','’','（','）','＊','＋','，','ー','．',
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'/','𝟶','𝟷','𝟸','𝟹','𝟺','𝟻','𝟼','𝟽','𝟾','𝟿','：','；','＜','＝','＞','？',
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'＠','𝙰','𝙱','𝙲','𝙳','𝙴','𝙵','𝙶','𝙷','𝙸','𝙹','𝙺','𝙻','𝙼','𝙽','𝙾',
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'𝙿','𝚀','𝚁','𝚂','𝚃','𝚄','𝚅','𝚆','𝚇','𝚈','𝚉','【','\\','】','＾','＿',
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'♦','𝚊','𝚋','𝚌','𝚍','𝚎','𝚏','𝚐','𝚑','𝚒','𝚓','𝚔','𝚕','𝚖','𝚗','𝚘',
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'𝚙','𝚚','𝚛','𝚜','𝚝','𝚞','𝚟','𝚠','𝚡','𝚢','𝚣','♠','-','↰','◁','▷'], //arrow up then NW (🢰) not included for UTF limitations
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CPAtariST = "⌂"+
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"ÇüéâäàåçêëèïîìÄÅÉæÆôöòûùÿÖÜ¢£¥ßƒ"+
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"áíóúñѪº¿⌐¬½¼¡«»ãõØøœŒÀÃÕ¨´†¶©®™"+
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"ijIJאבגדהוזחטיכלמנסעפצקרשתןךםףץ§∧∞"+
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"αβΓπΣσµτΦΘΩδ∮φ∈∩≡±≥≤⌠⌡÷≈°∙·√ⁿ²³¯",
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CPSpeccy = ['©', //too SPECIAL with all the tokens-for-characters, gotta use lists
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' ',' ▀','▀ ','▀▀',' ▄',' █','▀▄','▄█', '▄ ','▄▀','█ ','█▀','▄▄','▄█','█▄','██', //80~F
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'𝘼','𝘽','𝘾','𝘿','𝙀','𝙁','𝙂','𝙃','𝙄','𝙅','𝙆','𝙇','𝙈','𝙉','𝙊','𝙋', //90~F
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'𝙌','𝙍','𝙎','𝚉𝚇¹²⁸','⏯️','𝚁𝙽𝙳','𝙸𝙽𝙺𝙴𝚈$','π', '𝙵𝙽 ','𝙿𝙾𝙸𝙽𝚃 ','𝚂𝙲𝚁𝙴𝙴𝙽$ ','𝙰𝚃𝚃𝚁 ','𝙰𝚃 ','𝚃𝙰𝙱 ','𝚅𝙰𝙻$ ','𝙲𝙾𝙳𝙴' , //A0~F
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'𝚅𝙰𝙻 ','𝙻𝙴𝙽 ','𝚂𝙸𝙽 ','𝙲𝙾𝚂 ','𝚃𝙰𝙽 ','𝙰𝚂𝙽 ','𝙰𝙲𝚂 ','𝙰𝚃𝙽 ', '𝙻𝙽 ','𝙴𝚇𝙿 ','𝙸𝙽𝚃 ','𝚂𝚀𝚁 ','𝚂𝙶𝙽 ','𝙰𝙱𝚂 ','𝙿𝙴𝙴𝙺 ','𝙸𝙽 ', //B0~F
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'𝚄𝚂𝚁 ','𝚂𝚃𝚁$ ','𝙲𝙷𝚁$ ','𝙽𝙾𝚃 ','𝙱𝙸𝙽 ','𝙾𝚁 ','𝙰𝙽𝙳 ','≤', '≥','≠','𝙻𝙸𝙽𝙴 ','𝚃𝙷𝙴𝙽 ','𝚃𝙾 ','𝚂𝚃𝙴𝙿 ','𝙳𝙴𝙵 𝙵𝙽 ','𝙲𝙰𝚃 ', //C0~F
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'𝙵𝙾𝚁𝙼𝙰𝚃 ','𝙼𝙾𝚅𝙴 ','𝙴𝚁𝙰𝚂𝙴 ','𝙾𝙿𝙴𝙽 # ','𝙲𝙻𝙾𝚂𝙴 # ','𝙼𝙴𝚁𝙶𝙴 ','𝚅𝙴𝚁𝙸𝙵𝚈 ', '𝙱𝙴𝙴𝙿 ','𝙲𝙸𝚁𝙲𝙻𝙴 ','𝙸𝙽𝙺 ','𝙿𝙰𝙿𝙴𝚁 ','𝙵𝙻𝙰𝚂𝙷 ','𝙱𝚁𝙸𝙶𝙷𝚃 ','𝙸𝙽𝚅𝙴𝚁𝚂𝙴 ','𝙾𝚅𝙴𝚁 ','𝙾𝚄𝚃 ', //D0~F
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'𝙻𝙿𝚁𝙸𝙽𝚃 ','𝙻𝙻𝙸𝚂𝚃 ','𝚂𝚃𝙾𝙿 ','𝚁𝙴𝙰𝙳 ','𝙳𝙰𝚃𝙰 ','𝚁𝙴𝚂𝚃𝙾𝚁𝙴 ','𝙽𝙴𝚆 ', '𝙱𝙾𝚁𝙳𝙴𝚁 ','𝙲𝙾𝙽𝚃𝙸𝙽𝚄𝙴 ','𝙳𝙸𝙼 ','𝚁𝙴𝙼 ','𝙵𝙾𝚁 ','𝙶𝙾 𝚃𝙾 ','𝙶𝙾 𝚂𝚄𝙱 ','𝙸𝙽𝙿𝚄𝚃 ','𝙻𝙾𝙰𝙳 ', //E0~F
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'𝙻𝙸𝚂𝚃 ','𝙻𝙴𝚃 ','𝙿𝙰𝚄𝚂𝙴 ','𝙽𝙴𝚇𝚃 ','𝙿𝙾𝙺𝙴 ','𝙿𝚁𝙸𝙽𝚃 ','𝙿𝙻𝙾𝚃 ', '𝚁𝚄𝙽 ','𝚂𝙰𝚅𝙴 ','𝚁𝙰𝙽𝙳𝙾𝙼𝙸𝚉𝙴 ','𝙸𝙵 ','𝙲𝙻𝚂','𝙳𝚁𝙰𝚆 ','𝙲𝙻𝙴𝙰𝚁 ','𝚁𝙴𝚃𝚄𝚁𝙽', '𝙲𝙾𝙿𝚈'], //F0~F
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Chars0to1F = "・☺☻♥♦♣♠•◘○◙♂♀♪♫☼▶◀↕‼¶§▬↨↑↓→←∟↔▲▼", //#0 is a small dot from Japanese
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Chars0to1FLF = "・☺☻♥♦♣♠•◘○\x0A♂♀♪♫☼▶◀↕‼¶§▬↨↑↓→←∟↔▲▼",
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Chars0to1FCRLF = "・☺☻♥♦♣♠•◘○\x0A♂♀\x0D♫☼▶◀↕‼¶§▬↨↑↓→←∟↔▲▼",
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Chars0to1FSpeccy = "\x00\x01\x02\x03\x04\x05，📝⬅➡⬇⬆⌫\x0A№\x0F\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1A\x1B\x1C\x1D\x1E\x1F", //not mixing...
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Chars0to1FATASCII = "♥├◨┘┤┐／╲◢▗◣▝▘￣▂▖♣┌─┼•▄▎┬┴▌└␛↑↓←→",
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Chars0to1FATASCII2 = "áùÑÉçôòì£ïüäöúóöÜâûîéèñêȧàȦ␛↑↓←→",
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Chars0to1FATASCII_PL = "ŹąźćŚėöÖ£üߣłŃÓ√ĘśäÜĆĄŻÄż␛↑↓←→",
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Chars0to1FAtariX = "áùÑÉçôòì£ïüäÖúóöÜâûîéèñêȧàȦË↑↓←→";
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/**
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* Decode a 1-byte-per-character encoding from a byte array using the 129-byte-long table given,
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* as well as a table to display the first 32 characters.
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* @param {[uint8]} ansi - an array of uint8 (returned by readBytes).
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* @param {String[0x81]} dectbl - a decoding table; just make a const here in db/read for that
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* @param {bool} [zstop =true] - whether to stop reading on 0 (ASCIIZ behaviour)
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* @param {Array} [tbl01F=Chars0to1FCRLF] - which table to use for the first 32 characters
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* @returns {String} a string value usable with js, or an empty line if the decoding table wasn't found.
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* @example
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* 𝑓([7, 0x7F, 0, 0x32], true, Chars0to1FSpeccy, CPSpeccy]) === "📝©"
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* @example
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* 𝑓("\x07\x7F\x00\x32", false, Chars0to1FSpeccy, CPSpeccy]) === "📝© 2"
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*/
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function decEncoding(ansi, dectbl, zstop, tbl01F) {
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if(typeof dectbl === 'undefined') return '';
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if(typeof zstop === 'undefined') zstop = true;
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if(typeof tbl01F === 'undefined')
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if(dectbl == CPSpeccy) tbl01F = Chars0to1FSpeccy;
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else tbl01F = Chars0to1FCRLF;
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var s = "", bit8 = 0;
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for(var i=0; i < ansi.length; i++) {
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if (!ansi[i] && zstop) break;
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else if(ansi[i] < 0x80)
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switch(ansi[i]) { // 7-bit variation processing
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case 0x0E: if(dectbl == JISX0201 || dectbl == KOI8R) bit8 = 0x80;
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else s += tbl01F[0xE]; break;
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case 0x0F: if(dectbl == JISX0201 || dectbl == KOI8R) bit8 = 0;
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else s += tbl01F[0xF]; break;
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case 0x5C: if(dectbl == JISX0201) s += '¥'; else s += '\\'; break;
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case 0x5E: if(dectbl == CPSpeccy) s += '↑'; else s += '^'; break;
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case 0x60: if(dectbl == CPSpeccy) s += '£'; else s += '`'; break;
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case 0x7B: if(dectbl == CPATASCII)
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if(tbl01F == Chars0to1FATASCII2) s += 'Ä';
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else if(tbl01F == Chars0to1FATASCII_PL) s += ' '; //the Poles didn't need the spades without the other 3 :D
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else s += '♠';
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else s += '{'; break;
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case 0x7D: if(dectbl == CPATASCII) s += '↖'; else s += '}'; break; //arrow up then NW (🢰) not included for UTF limitations
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case 0x7E: if(dectbl == JISX0201) s += '‾'; else if(dectbl == CPATASCII) s += '◀'; else s += '~'; break;
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case 0x7F:
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if(dectbl != JISX0201) s += dectbl[0]; else s += String.fromCharCode(bit8+ansi[i]); break;
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default:
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if(!bit8 && ansi[i] >= 0 && ansi[i] < 0x20) s += tbl01F[ansi[i]];
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else s += String.fromCharCode(bit8+ansi[i]);
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}
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else s += dectbl[ansi[i]-0x7F];
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}
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return s;
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}
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/**
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* Decode a 1-byte encoding from file using the 129-byte-long table given, as well as a table to display
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* the first 32 characters. Analogous to decEncoding but reads the file directly.
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* @param {UInt} ofs - the offset to start from.
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* @param {UInt} len - the amount of bytes to read.
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* @param {String[0x81]} dectbl - a decoding table; just make a const here in db/read for that
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* @param {bool} zstop (optional, default=true) - whether to stop reading on 0 (ASCIIZ behaviour)
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* @param {Array} tbl01F (optional, default=Chars0to1FCRLF) - which table to use for the first 32 characters
|
||
* @returns {String} a string value usable with js, or an empty line if the decoding table wasn't found.
|
||
*/
|
||
function decAnsi(ofs, len, dectbl, zstop, tbl01F) {
|
||
return(decEncoding(X.readBytes(ofs,len), dectbl, zstop, tbl01F))
|
||
}
|
||
|
||
|
||
/**
|
||
* Checks for whether a value fits the limits using <=, as opposed to isInside.
|
||
* @param {Number} a - the value to check.
|
||
* @param {Number} mina
|
||
* @param {Number} maxa
|
||
* @returns {Bool}
|
||
* @example
|
||
* 𝑓(20, 10, 40) === true; 𝑓(20,10,20) === true
|
||
*/
|
||
function isWithin(a, mina, maxa) {
|
||
return mina <= a && a <= maxa
|
||
}
|
||
|
||
/**
|
||
* Checks for whether a value fits the limits using <, as opposed to isWithin. Useful for floats.
|
||
* @param {Number} a - the value to check.
|
||
* @param {Number} mina
|
||
* @param {Number} maxa
|
||
* @returns {Bool}
|
||
* @example
|
||
* 𝑓(20.1, 10.0, 40.0) === true; 𝑓(20.1, 10.0, 20.0) === false
|
||
*/
|
||
function isInside(a, mina, maxa) {
|
||
return mina < a && a < maxa
|
||
}
|
||
|
||
|
||
/**
|
||
* Derive a string hexadecimal value, zero-padded.
|
||
* @param {Int} a - the numerical value.
|
||
* @param {UInt} [padz=2] - how many characters to zero-pad to.
|
||
* @returns {String} The hex value, capital letters A~F, ending with "h".
|
||
*/
|
||
function Hex(a, padz) {
|
||
if(typeof a === 'undefined') return "!Hex("+a+")";
|
||
if(typeof padz === 'undefined') padz = 2;
|
||
var minus=""; if(a<0) { a = -a; minus = "-" }
|
||
var r = a.toString(16).toUpperCase(); var pads="";
|
||
if(r.length < padz) pads = Array(1 + padz - r.length).join('0');
|
||
return minus+pads+r+"h"
|
||
}
|
||
|
||
|
||
/**
|
||
* Derive a string binary value, zero-padded.
|
||
* @param {Int} a - the numerical value.
|
||
* @param {UInt} [padz=4] - how many characters to zero-pad to.
|
||
* @returns {String} The bin value, characters '0' or '1', ending with "b".
|
||
*/
|
||
function Bin(a, padz) {
|
||
if(typeof a === 'undefined') return "!Bin("+a+")";
|
||
if(typeof padz === 'undefined') padz = 4;
|
||
var minus = ""; if(a < 0) { a = -a; minus = "-" }
|
||
var r = a.toString(2); var pads="";
|
||
if(r.length < padz) pads = Array(1 + padz - r.length).join('0');
|
||
return minus+pads+r+"b"
|
||
}
|
||
|
||
|
||
/**
|
||
* Derive a string octal value, zero-padded.
|
||
* @param {Int} a - the numerical value.
|
||
* @param {UInt} [padz=3] - how many characters to zero-pad to.
|
||
* @returns {String} The octal value, characters 0~7, ending with "o".
|
||
*/
|
||
function Oct(a, padz) {
|
||
if(typeof a === 'undefined') return "!Oct("+a+")";
|
||
if(typeof padz === 'undefined') padz = 3;
|
||
var minus = ""; if(a < 0) { a = -a; minus = "-" }
|
||
var r = a.toString(8); var pads="";
|
||
if(r.length < padz) pads = Array(1 + padz - r.length).join('0');
|
||
return minus+pads+r+"o"
|
||
}
|
||
|
||
|
||
/**
|
||
* Read a variable-length quantity, an unsigned integer like in MIDI files, from the file.
|
||
* @param {UInt} ofs - the offset to start from.
|
||
* @returns {List} [length,value] - if length (in physical bytes) = 0, the value had a problem.
|
||
* @example
|
||
* //For file containing '81 80 01 81 83 7F':
|
||
* 𝑓(0) === 0x4001; 𝑓(3) === 0x41FF
|
||
**/
|
||
function readVarUInt(ofs) {
|
||
if(ofs < 0 || ofs >= File.getSize()) return [0,0];
|
||
var t = 0, wb = 1, r = 1, o = ofs;
|
||
var b = X.U8(o++); t = (t << 7) | (b&0x7F);
|
||
var b_ = b; while(b_) { b_ >>= 1; wb++ }
|
||
for(; r < 16 && (b&0x80); r++) { b = X.U8(o++); t = (t << 7) | (b&0x7F) }
|
||
if(wb > 64) return [0,0xFFFFFFFFFFFFFFFF]; // sizeof(target) in bits. A 64bit value should be enough, right?
|
||
else if(b&0x80) return [0,-1]; //EOF
|
||
else return [r,t]
|
||
}
|
||
|
||
|
||
/**
|
||
* This object facilitates reading a file as a sequence of bits
|
||
* @init {UInt} [nOffset = 0] - provide the file offset
|
||
* @param {UInt} nBits - bits to read, autolimits to 32 (so read little by little!)
|
||
* @returns {UInt} read value as integer, -1 if EoF reached
|
||
* @example
|
||
* First create an instance with the file object: var bits = new BitReader(10);
|
||
* Then call the readBits method with the number of bits you want: var value = bits.read(5)
|
||
* Or put the reader towards a different place: bits.init(10)
|
||
* Receive the current bit-file offset: bits.offset
|
||
* Set the bit-file's offset, in bytes, without changing state: bits.seek(10)
|
||
* Set the bit-file's offset in bits: bits.bseek(14)
|
||
* Skip some bytes without changing state: bits.consume(2)
|
||
**/
|
||
function BitReader(nOffset, nEndian) {
|
||
this.n = 0; // the number of bits in the buffer
|
||
this.buf = 0; // the bit buffer
|
||
this.offset = nOffset ? nOffset : 0; // the file offset
|
||
this.endian = nEndian ? nEndian : _LE; // for different mechanics of bitstreaming; ogg/flac use _BE
|
||
|
||
// use this to change the pointer, which will reinit the reader, but not the logger
|
||
this.init = function(nOffset) { this.ofs = nOffset ? nOffset : 0; this.n = this.buf = 0 }
|
||
|
||
// the method to read b bits from the file
|
||
this.read = function(nBits) {
|
||
if(nBits > 64) nBits = 64; if(nBits < 0) return 0;
|
||
if(this.endian === _LE) {
|
||
while(this.n < nBits) { // while the buffer is not enough
|
||
this.buf |= Util.shlu64(File.read_uint8(this.offset++),this.n); // read a byte and append it to the buffer
|
||
this.n += 8; // increase the bit number by 8
|
||
}
|
||
var v = this.buf & (Util.shlu64(1,nBits) - 1); // extract the desired bits from the buffer
|
||
this.buf = Util.shru64(this.buf,nBits); // shift the buffer to the right
|
||
} else {
|
||
while(this.n < nBits) {
|
||
this.buf = Util.shlu64(this.buf,8) | File.read_uint8(this.offset++); // shift the buffer to the left and append a byte
|
||
this.n += 8;
|
||
}
|
||
var v = Util.shru64(this.buf,this.n - nBits); // extract the desired bits from the most significant part of the buffer
|
||
this.buf &= Util.shru64((Util.shlu64(1,this.n)-1),nBits); // clear the extracted bits from the buffer
|
||
}
|
||
this.n -= nBits; // decrease the bit number by b
|
||
return v; // return the value even if the file is exhausted
|
||
}
|
||
|
||
// Skip some bytes without changing state: bits.consume(2)
|
||
this.consume = function(nBytes) { this.offset += nBytes; }
|
||
|
||
// Set the bit-file's offset, in bytes, without changing state:
|
||
this.seek = function(nOfs) { this.offset = nOfs; }
|
||
|
||
// Set the bit-file's offset in bits:
|
||
this.bseek = function(nOfs) { this.offset = nOfs - (nOfs%8); this.buf = this.n = 0; this.read(nOfs%8); }
|
||
}
|
||
|
||
|
||
function bitCount(n) {
|
||
var c = 0; n = !!n; while(n) { if((n&1)) c++; n >>= 1 } return c
|
||
}
|
||
|
||
/**
|
||
* Check a file slice for being all one of a lineup of specified characters.
|
||
* @param {UInt} ofs - the offset to start from.
|
||
* @param {UInt} len - the amount of bytes to check.
|
||
* @param {[Array(UInt)] | UInt} bl = [0] - the list of possible u_int8 codes, or just one u_int8. 0 by default.
|
||
* @returns {UInt} - offset if a byte in the slice doesn't belong to the list. If you go beyond EoF or all good, -1.
|
||
* @example
|
||
* //For '00 01 02 01' at offset 6 in the file:
|
||
* firstNotOf (6, 4, [0,1]) === 8; firstNotOf(6, 4, 1) === 6
|
||
*/
|
||
function firstNotOf(ofs, len, bl) {
|
||
if(ofs+len > X.Sz()) return -1; var c = i = 0;
|
||
if(Array.isArray(bl)) {
|
||
for(i = 0; i < bl.length; i++) if(typeof bl[i] !== 'number' || bl[i] < 0 || bl[i] % 1 != 0) break;
|
||
if(i < bl.length) throw new Error('firstNotOf cannot parse: '+outArray(bl));
|
||
}
|
||
else if(typeof bl === 'number' && bl > 0 && bl % 1 == 0) bl = [bl]; else bl = [0];
|
||
// and now test the slice
|
||
for(i = 0; i < len && ofs+i < X.Sz(); i++) if(bl.indexOf(X.U8(ofs+i)) < 0) break;
|
||
return i < len? ofs+i : -1
|
||
}
|
||
|
||
|
||
function isAllZeroes(ofs, len) { return firstNotOf(ofs, len, 0) < 0 } //a subcase for whether a slice is all zeroes
|
||
|
||
|
||
/**
|
||
* If the string was too long and has been read incompletely, adds an ellipsis after the last
|
||
* complete word, to avoid cut-off words. If `space characters' are not detected,
|
||
* replaces the last character with an ellipsis. Does NOT do the trim() unless the whole string fits the limit.
|
||
* Mostly usable for lengthy multiline comments/messages.
|
||
* @param {String} a - the original incomplete string.
|
||
* @param {Number} trim - the buffer size; if a.length == trim, we decide it was cropped.
|
||
* @param {Number} [mintrim = 78] - don't try searching for spaces below this point.
|
||
* @returns {String} - the resulting string.
|
||
* @example
|
||
* // Full string fits the limits, no need to search for a good cut-off place, and it's trimmed for pretty:
|
||
* 𝑓(" 12345 7890, 34 678. 1 3'56789", 35, 15) === "12345 7890, 34 678. 1 3'56789"
|
||
* @example
|
||
* // The length is a full match but it might be trimmed right along that length, so a good cut-off place is found:
|
||
* 𝑓(" 12345 7890, 34 678. 1 3'56789", 30, 15) === " 12345 7890, 34 678. 1 3…"
|
||
* @example
|
||
* // The length is a full match and last 5 characters don't have spaces, so it's treated as trimmed but it's not cut:
|
||
* 𝑓(" 12345 7890, 34 678. 1 3'56789", 30, 25) === " 12345 7890, 34 678. 1 3'56789…"
|
||
* @example
|
||
* // Just another example of a well-trimmed line, in which you need a lot less info that it has to offer:
|
||
* 𝑓(" 12345 7890, 34 678. 1 3'56789", 16, 10).trim() === "12345 7890, 34…"
|
||
*/
|
||
function addEllipsis(a, trim, mintrim) {
|
||
if(!trim) trim = 0xA0;
|
||
if(!mintrim) mintrim = 78; if(a.length < trim || mintrim > trim) return a.trim();
|
||
const spaces = " .,:;!\\/'\"=&\x09\x0D\x0A\x1A\x26。、｡,，・";
|
||
var i = trim, c = 0, ci = -1;
|
||
while(i >= mintrim && c < 2) {
|
||
if(spaces.indexOf(a[i]) >= 0) { c++; while(spaces.indexOf(a[i]) >= 0) i--; if(ci < 0) ci = i+1 }
|
||
while(spaces.indexOf(a[i]) < 0 && i >= 0) i--
|
||
}
|
||
if((i < mintrim && c < 2) //we conclude this language doesn't really have that many spaces...
|
||
|| !c) //...or none at all in the trimmable slice...
|
||
return a.slice(0,trim)+'…';
|
||
else //this language has some spaces and we can use the last one to trim
|
||
return a.slice(0,Math.max(ci),mintrim)+'…';
|
||
}
|
||
|
||
|
||
/**
|
||
* sOptions.appendS a string (optionally prefixed) if the space-trimmed string is not empty.
|
||
* @param {variant} a - the string to output (safe to accidentally drop a non-string in)
|
||
* @param {String} [prefix=''] - what to put in front of the output string
|
||
* @param {String} [suffix=''] - what to put after the output string
|
||
* @param {String} [sep=','] - what to put between the previous string and this addition
|
||
* @example
|
||
* //for sOptions === ' ch:2':
|
||
* 𝑓('hello world ', 'msg:"', '"', ', '); //sOptions === 'ch:2, msg:"hello world\"'
|
||
*/
|
||
function sOptionT(a, prefix, suffix, sep) {
|
||
if (typeof prefix === 'undefined') prefix = ""; if (typeof suffix === 'undefined') suffix = "";
|
||
if (typeof sep === 'undefined') sep = ',';
|
||
if ((""+a).trim() != "") sOptions = sOptions.appendS(prefix+(""+a).trim()+suffix, sep)
|
||
}
|
||
|
||
|
||
/**
|
||
* sOptions.appendS a string (optionally prefixed) if the string is not empty.
|
||
* @param {variant} a - the string to output (safe to accidentally drop a non-string in)
|
||
* @param {String} [prefix=''] - what to put in front of the output string
|
||
* @param {String} [suffix=''] - what to put after the output string
|
||
* @param {String} [sep=','] - what to put between the previous string and this addition
|
||
* @example
|
||
* //for sOptions === ' ch:2':
|
||
* 𝑓('hello world ', 'msg:"', '"', ', '); //sOptions === 'ch:2, msg:"hello world\"'
|
||
*/
|
||
function sOption(a, prefix, suffix) {
|
||
if (typeof prefix === 'undefined') prefix = ""; if (typeof suffix === 'undefined') suffix = "";
|
||
if (typeof sep === 'undefined') sep = ',';
|
||
if ((""+a) != "") sOptions = sOptions.appendS(prefix+(""+a)+suffix, sep)
|
||
}
|
||
|
||
|
||
/**
|
||
* A more verbose (but still concise) way of outputting the calculated size(s), derived using different algorithms,
|
||
* taking into account and visualising the difference from the actual file size.
|
||
* If some of the reported sizes match, the value will only be displayed once.
|
||
* It's still a good idea to add "/malformed!short" to the version string — it's visible without isVerbose.
|
||
* @param {...Number} sizes - numerical values
|
||
* @example
|
||
* // If a file is 100 bytes long:
|
||
* outSz(90,100,105) === "90(+10)/100/105(-5!)"
|
||
* // The "!)" thus indicates the file is too short compared to the algorithmic estimation.
|
||
*/
|
||
function outSz() { if(!arguments.length || typeof arguments[0] === 'undefined') return "?";
|
||
var sizes = [], origs = [];
|
||
for(i = 0; i < arguments.length; i++)
|
||
if(arguments[i] >= 0) if(!origs.length || origs.indexOf(arguments[i]) < 0) {
|
||
origs.push(arguments[i]);
|
||
sizes.push(
|
||
arguments[i] < File.getSize() ? arguments[i]+"(+"+(File.getSize()-arguments[i])+")"
|
||
: arguments[i] > File.getSize() ? arguments[i]+"(-"+(arguments[i]-File.getSize())+"!)"
|
||
: arguments[i]
|
||
)
|
||
} else; else sizes.push("?");
|
||
return sizes.join("/")
|
||
}
|
||
|
||
|
||
/**
|
||
* Converts an array to a better-looking line than the usual flat thing DiE's _log would output.
|
||
* @param {Array} a - Array to process consisting of any information including arrays
|
||
* @param {Int} [base = 10] - If an integer value is found, in which base to display it
|
||
* @param {Int} [zeropad] - If an integer value is found, how many zeroes to pad it with (smart by default)
|
||
* @returns {String} A beautiful output!
|
||
* @example
|
||
* 𝑓([ 1, [5, [10,30]], [[23],'test'] ], 2) == "[0001, [0101, [1010, 11110]], [[10111], "test"]]"
|
||
* 𝑓([ 1, [5, [10,30]], [[23],'test'] ], 2, 8) == "[00000001, [00000101, [00001010, 00011110]], [[00010111], "test"]]"
|
||
* 𝑓([ 1, [5, [10,30]], [[23],'test'] ], 16) == "[01, [05, [0A, 1E]], [[17], "test"]]"
|
||
*/
|
||
function outArray(a,base,pad) {
|
||
if(!Array.isArray(a)) return a;
|
||
if(typeof base !== 'number' || base % 1 !== 0) base = 10;
|
||
if(typeof pad !== 'number' || pad % 1 !== 0) //not integer
|
||
if(typeof pad === 'undefined')
|
||
if(base == 8) pad = 3; else if(base == 16) pad = 2; else if(base == 2) pad = 4; else pad = 0;
|
||
for(var i=0, s = []; i < a.length; i++)
|
||
if(Array.isArray(a[i])) s.push(outArray(a[i],base,pad)); else
|
||
if(typeof a[i] === 'number' && a[i] % 1 === 0) //integer
|
||
s.push(a[i].toString(base).toUpperCase().padStart(pad,'0'));
|
||
else if(typeof a[i] === 'string') s.push('"'+a[i]+'"');
|
||
else s.push(a[i]);
|
||
return '['+s.join(', ')+']' //put '[ '...' ]' for an even more spaced output
|
||
}
|
||
|
||
|
||
/**
|
||
* A shorthand for the situation where you compare the file suffix to what you'd expect.
|
||
* Use as the option to Binary.isHeuristicScan().
|
||
* @param {String} a - the expected file suffix, case-insensitive, no heading period unlike Python
|
||
* @returns {bool} if a match is reached
|
||
*/
|
||
function extIs(a) { return File.getFileSuffix().toLowerCase() == a.toLowerCase() }
|
||
|
||
|
||
/**
|
||
* slashTag formats a string in a way that's useful when a tag has two versions (for ex. in different languages).
|
||
* It will either show both with "/" in between, or one of them if the other one's an empty string, or an empty string if both are empty.
|
||
* @param {String} a - the first of the two
|
||
* @param {String} b - the second of the two
|
||
* @returns {String}
|
||
*/
|
||
function slashTag(a, b) {
|
||
if(a == b) return a;
|
||
else if(a != "" && b == "")
|
||
return a;
|
||
else if(a == "" && b != "")
|
||
return b;
|
||
else if(a != "" && b != "")
|
||
return a+"/"+b;
|
||
else return ""
|
||
}
|
||
|
||
|
||
/**
|
||
* createOrderlyHuffmanTable is just for detections but it does return the table for further checks. Or it returns false.
|
||
* @param {Array} lent - the lengths table
|
||
* @param {String} btl - bit table length
|
||
* @param {BitReader} br - a BitReader object pointing somewhere at the right position for this. The provided BitReader WILL change state.
|
||
* @returns {Array or false}
|
||
*/
|
||
function createOrderlyHuffmanTable(lent, btl, br) {
|
||
var md = 32, Md = reall = code = 0; var _t = [], fi = [], li = [], ni = [];
|
||
for(i = 0; i < 33; i++) fi[i] = 0xFFFF;
|
||
for(i = 0; i < btl; i++) { len = lent[i]; if(len) {
|
||
if(len < md) md = len; if(len > Md) Md = len;
|
||
if(fi[len] == 0xFFFF) { fi[len] = li[len] = i } else { ni[li[len]] = i; li[len] = i } reall++ } }
|
||
if(!Md) return false;
|
||
for(d = md; d <= Md; d++) {
|
||
if(fi[d] != 0xFFFF) ni[li[d]] = btl;
|
||
for(i = fi[d]; i < btl; i = ni[i]) {
|
||
//insert HuffmanCode:
|
||
var j = 0, le = _t.length;
|
||
for(var cb = d; cb >= 0; cb--) {
|
||
var cob = (cb && ( ( (code>>(Md-d)) >> (cb-1) ) & 1 ) ) ? 1 : 0;
|
||
if(j != le) {
|
||
if(!cb || (!_t[j][0] && !_t[j][1])) return false; //[0] is left, [1] is right, [2] is value
|
||
if(!_t[j][cob]) _t[j][cob] = j = le; else j = _t[j][cob];
|
||
} else {
|
||
_t.push([ (cb&&!cob)?le+1:0, (cb&&cob)?le+1:0, cb?0:i ]);
|
||
j++; le++
|
||
} }
|
||
code += 1 << (Md-d) } }
|
||
return _t
|
||
}
|
||
|
||
|
||
/**
|
||
* Outputs time in seconds as short human-readable, with a "h:mm:ss" alternative when < 1 day.
|
||
* Millenia, centuries and years as sidereal years, a "month" duration is 1/12 of such year.
|
||
* @param {Number} seconds
|
||
* @returns {String}
|
||
* @example
|
||
* 𝑓(123456789) === "31Y10M4w21h33m9s"; 𝑓(1234567) === "2w6h56m7s"; 𝑓(12345) === "3:25:45"
|
||
*/
|
||
function secondsToTimeStr(s) {
|
||
const mul = [/*millenia*/315581497635,/*centuries*/3155814976,/*yrs*/31558150,/*mns*/2629846,/*wks*/604800,86400,3600,60];
|
||
var r = "", ss = s%mul[7], mm = Util.div64(s%mul[6],mul[7]), hh = Util.div64(s%mul[5],mul[6]),
|
||
dd = Util.div64(s%mul[4],mul[5]), ww = Util.div64(s%mul[3],mul[4]), mn = Util.div64(s%mul[2],mul[3]),
|
||
yy = Util.div64(s%mul[1],mul[2]), cc = Util.div64(s%mul[0],mul[1]), mi = Util.div64(s,mul[0]);
|
||
if(s < 86400) { r = mm.padStart(2,'0')+":"+ss.padStart(2,'0'); if(hh) r = hh+":"+r; return r }
|
||
if(ss) r = ss+"s"+r; if(mm) r = mm+"m"+r; if(hh) r = hh+"h"+r; if(dd) r = dd+"d"+r; if(ww) r = ww+"w"+r;
|
||
if(mn) r = mn+"M"+r; if(yy) r = yy+"Y"+r; if(cc) r = cc+"C"+r; if(mi) r = ci+"Mil"+r; return r
|
||
}
|
||
|
||
|
||
/**
|
||
* Examines a sequence and gives a generalised idea of what sort of characters a string is (mostly) made of.
|
||
* Parse the result using indexOf.
|
||
* Could be useful for validating structured files with human-filled fields.
|
||
* @param {String/Number[]} s - your string in question, or a List of charcodes.
|
||
* @param {Boolean} [needall=CS_BEST] - if true, you have "allascallt allnum" for a line of spaces, else just "allt ".
|
||
* @returns {String} - at least one or a combo of these, optional prefix "all" (otherwise treat as "mostly"):
|
||
* '?': wrong type; 'empty': 0 length; '00': zeroes; 't ': tabs/spaces; 'ctl': 0-1Fh & 7Fh; 'num': numerical;
|
||
* 'asc': 20h-7Eh; 'xsc': zeroes+tabs+♫+FFh+crlf+ascii; 'foreign': 00,t, ,crlf, 80h+; 'any': decision cannot be made.
|
||
* @example
|
||
* 𝑓("-123 456.789") === "allnum"; 𝑓("-123 456.789", CS_ALL) === "allnumallascallxscallforeign"
|
||
*/
|
||
/* beautify preserve:start */
|
||
function charStat() {
|
||
if(!arguments.length) return "?";
|
||
if(typeof arguments[0] === "undefined" || typeof arguments[0] === "number") return "?";
|
||
str = arguments[0];
|
||
if(arguments.length < 2) needall = false; else needall = !!arguments[1];
|
||
if(str == "" || str == []) return "empty";
|
||
var i, s = [], c = [ /*[0]00*/0, /*[1]t */0, /*[2]asc*/0, /*[3]xsc*/0, /*[4]num*/0,
|
||
/*[5]ctl*/0, /*[6]foreign*/0 ], o = [0,0,0,0,0,0,0,0];
|
||
if(typeof str === "string") for(i = 0; i < str.length; i++) s.push(str.charCodeAt(i)); else s = str;
|
||
for(i=0;i<s.length;i++) {
|
||
if(!s[i]) { c[0]++; c[3]++; c[5]++; c[6]++ }
|
||
else if(s[i] == 9) { c[1]++; c[3]++; c[5]++; c[6]++ }
|
||
else if(s[i] == 0xA || s[i] == 0xD) { c[3]++; c[5]++; c[6]++ }
|
||
else if(s[i] == 0xE) { c[3]++; c[5]++ }
|
||
else if(s[i] <= 0x1F || s[i] == 0x7F) c[5]++;
|
||
else if(s[i] == 0x20) { c[1]++; c[2]++; c[3]++; c[4]++; c[6]++; }
|
||
else if(0x2B <= s[i] && s[i] <= 0x2D || 0x30 <= s[i] && s[i] <= 0x39) { c[2]++; c[3]++; c[4]++; c[6]++ }
|
||
else if(s[i] <= 0x7E) { c[2]++; c[3]++ }
|
||
else if(s[i] == 0xFF) { c[3]++; c[6]++ }
|
||
else if(s[i] > 0x7F) c[6]++
|
||
} for(i = 0; i < c.length; i++) o[i] = Util.div64(c[i]*100,s.length);
|
||
r = "";
|
||
//_log((typeof str)+" "+s+" {"+c+"} <"+o+">")
|
||
if(!needall) {
|
||
if(o[0] > 70) { if(o[0] === 100) r += "all"; r += "00" }
|
||
else if(o[1] > 70) { if(o[1] === 100) r += "all"; r += "t " }
|
||
else if(o[4] > 70) { if(o[4] === 100) r += "all"; r += "num" }
|
||
else if(o[2] > 70) { if(o[2] === 100) r += "all"; r += "asc" }
|
||
else if(o[3] > 70) { if(o[3] === 100) r += "all"; r += "xsc" }
|
||
else if(o[5] > 70) { if(o[5] === 100) r += "all"; r += "ctl" }
|
||
else if(o[6] > 70) { if(o[6] === 100) r += "all"; r += "foreign" }
|
||
} else {
|
||
if(o[0] > 70) { if(o[0] === 100) r += "all"; r += "00" }
|
||
if(o[1] > 70) { if(o[1] === 100) r += "all"; r += "t " }
|
||
if(o[4] > 70) { if(o[4] === 100) r += "all"; r += "num" }
|
||
if(o[2] > 70) { if(o[2] === 100) r += "all"; r += "asc" }
|
||
if(o[3] > 70) { if(o[3] === 100) r += "all"; r += "xsc" }
|
||
if(o[5] > 70) { if(o[5] === 100) r += "all"; r += "ctl" }
|
||
if(o[6] > 70) { if(o[6] === 100) r += "all"; r += "foreign" }
|
||
}
|
||
if(r == "") return "any"+o; else return r
|
||
}
|
||
|
||
|
||
// PATCHING FUNCTIONALITY; promised to become native
|
||
// May be useful in some ugly cases for quickly pre-processing the file contents which are then detected.
|
||
var patcheddata = [];
|
||
function rpU8(adr) { //read patched data or passthrough, U8
|
||
for(var i=0; i < patcheddata.length; i++) if(patcheddata[i][0] == adr) return patcheddata[i][1];
|
||
return X.U8(adr)
|
||
}
|
||
function rpU16be(adr) { //read patched data or passthrough, U16 BE
|
||
return (rpU8(adr) << 8) | rpU8(adr+1)
|
||
}
|
||
function rpU32be(adr) { //read patched data or passthrough, U32 BE
|
||
return (rpU8(adr) << 24) | (rpU8(adr+1) << 16) | (rpU8(adr+2) << 8) | rpU8(adr+3)
|
||
}
|
||
function wpU8(adr,val) { //add to patches, U8
|
||
for(var i=0; i < patcheddata.length; i++)
|
||
if(patcheddata[i][0] == adr) { patcheddata[i][1] = val; return }
|
||
patcheddata.push([adr,val])
|
||
}
|
||
function wpU16be(adr,val) { //add to patches, U16 BE
|
||
wpU8(adr,(val>>8)&0xFF); wpU8(adr+1,val&0xFF)
|
||
}
|
||
function wpU32be(adr,val) { //add to patches, U32 BE
|
||
wpU8(adr,(val>>24)&0xFF); wpU8(adr+1,(val>>16)&0xFF);
|
||
wpU8(adr+2,(val>>8)&0xFF); wpU8(adr+3,val&0xFF)
|
||
}
|
||
function patchLength() { return patcheddata.length }
|
||
function patchClear() { patcheddata = [] }
|
||
|
||
|
||
/**
|
||
* Discovers gaps in an unsorted array of pairs of [offset, length], with a minimum-to-report gap as optional parameter.
|
||
* Useful for extra checks in file resource formats, without signatures but not sparse, so you can tell whether the resource blocks have no spaces in-between and don't overlap, using this and findIntersections.
|
||
* @param {Array of arrays[2]} lst - List to process consisting of ranges
|
||
* @param {UInt} [mingap=1] - Minimum gap, default to at least 1 byte between the ranges. Change for aligned data
|
||
* @returns {Array of arrays[2]} Sorted list of gap ranges in the same format
|
||
* @example
|
||
* // We have data defined in 10..20, 25..30, 40..50:
|
||
* 𝑓([ [10,10], [25,5], [40,10] ]) === [ [20,5], [30,10] ]
|
||
*/
|
||
function findGaps(lst, mingap) {
|
||
var i, r = []; /* tests for input typing follow */ if(!Array.isArray(lst) || lst.length < 2) return r;
|
||
for(i = 0; i < lst.length; i++) if(!Array.isArray(lst[i]) || lst[i].length != 2
|
||
|| typeof lst[i][0] !== 'number' || typeof lst[i][1] !== 'number') return r;
|
||
if(typeof mingap !== 'number') mingap = 1;
|
||
function sf(a, b) { if(a[0] != b[0]) return a[0]-b[0]; else return a[1]-b[1] }
|
||
var a = lst.sort(sf);
|
||
for(i = 1; i < a.length; i++)
|
||
if((t=a[i-1][0]+a[i-1][1]) < a[i][0] && a[i][0]-t-mingap >= 0) r.push([t, a[i][0]-t])
|
||
return r
|
||
}
|
||
|
||
|
||
/**
|
||
* Discovers intersections in an unsorted array of pairs of [offset, length], considering all possible pairs.
|
||
* Useful for extra checks in file resource formats, without signatures but not sparse, so you can tell whether the resource blocks don't overlap and have no spaces in-between, using this and findGaps.
|
||
* @param {Array of arrays[2]} lst - List to process consisting of ranges defined as [offset,length]
|
||
* @param {Boolean} [detectone=false] - Stop searching after finding even one intersection
|
||
* @returns {Array of arrays[2]} Sorted list of intersection ranges in the same format; if length > 0, intersection present
|
||
* @example
|
||
* 𝑓([ [10,20], [15,10], [23,30] ]) = [[15,10], [23,2], [23,7]]
|
||
* 𝑓([ [10,20], [15,10], [23,30] ], true) = [[15,10]]
|
||
*/
|
||
function findIntersections(lst,detectone) {
|
||
var i, t, r = []; /* tests for input typing follow */ if(!Array.isArray(lst) || lst.length < 2) return r;
|
||
for(i=0; i < lst.length; i++) if(!Array.isArray(lst[i]) || lst[i].length != 2
|
||
|| typeof lst[i][0] !== 'number' || typeof lst[i][1] !== 'number') return r;
|
||
function sf(a, b) { if(a[0] != b[0]) return a[0]-b[0]; else return a[1]-b[1] }
|
||
var a = lst.sort(sf); var found = false;
|
||
for(i=1; i < a.length && !found; i++)
|
||
for(j=0; j < i && !found; j++)
|
||
if((t=a[j][0]+a[j][1]) > a[i][0]) { if(detectone) found = true;
|
||
//_log(' item#'+j+' ['+lst[j][0]+' -> '+lst[j][1]+'] intersects with item#'+i+' ['+lst[i][0]+' -> '+lst[i][1]+']')
|
||
r.push([a[i][0], a[i][0]+a[i][1] <= t ? a[i][1] : t-a[i][0]])
|
||
}
|
||
return r.sort(sf);
|
||
}
|
||
|
||
|
||
/**
|
||
* Finds several signatures one after the other, using an array of pairs of [signature, range] and starting from a specified offset. The range to search across is in the 0-th element of aList.
|
||
* Maxlength is to be interpreted the same as in findSignature. (It has to be at least the length of the signature.)
|
||
* @param {UInt} nOffset - Where to start searching from (or 0 if bad data).
|
||
* @param {Array of arrays[2]} aList - List to process consisting of pairs of [signature, range].
|
||
* @param {UInt} [nStep=1] - In case subsequent searches fail, skip this many bytes before searching for more (this handles alignments too). If 0, stop if not found immediately.
|
||
* @returns -1 if not found, offset otherwise.
|
||
* @example
|
||
* //on your common Windows EXE file:
|
||
* 𝑓(0, 0x400, [ ["'MZ'",0], ["'PE'0000",0x200] ])
|
||
*/
|
||
function findMultiple(nOffset, nLength, aList, nStep) {
|
||
var r, lst = aList || [], ofs = ofs0 = nOffset || 0, max = Math.min(X.Sz(), ofs+(nLength||0)), st = nStep || 1;
|
||
if(!lst.length) return -1;
|
||
for(i = 0; i < lst.length && ofs <= max; i++) {
|
||
if(ofs >= max) return -1;
|
||
r = X.fSig(ofs, lst[i][1], lst[i][0]);
|
||
//_l2r('FMP',ofs,'['+i+'] st:'+st+' max:'+Hex(max)+' r '+lst[i][0]+' ~ '+Hex(lst[i][1])+' = '+Hex(r));
|
||
if(r < 0) { if(!st) return -1; ofs0 += st; ofs = ofs0; i = -1; }
|
||
else { ofs = r+lst[i][1]; if(!i) ofs0 = r; }
|
||
}
|
||
return ofs0
|
||
}
|
||
|
||
// Heuristic considerations for whether the sample name will be interesting enough to an average user.
|
||
//
|
||
// The optional "ctx" is context, an array of other sample names (or other tokens) known so far.
|
||
// For example, if the file's just starting and you're on the fence whether "loop" is good to know or not,
|
||
// it'll give you the chance to put it there just in case, but not if the other names are "boring" or "useless".)
|
||
// Try not to use it but also feel free to use it! Fun takes priority.
|
||
//
|
||
// Please add conditions liberally!
|
||
function funSampleName(n, ctx) {
|
||
var fun = 1, bore = 0; //by default, we're curious about the new line just a little
|
||
if(n.trim() == '') return false;
|
||
if(n.endsWithCI('.wav') || n.endsWithCI('.smp')) bore++;
|
||
if(n.beginsWithCI('ST-') || n.beginsWithCI('df0:')) bore++;
|
||
if(n.beginsWithCI('#')) fun += 5;
|
||
if(/.*(dr[u]?m\d+|loop\d+|strings?\d*|bass\s*|guitar\s*\d+|snare\s*\d+).*/i.test(n)) bore++;
|
||
//_setResult('fsn',n,'fun='+fun+' bore='+bore,'')
|
||
return fun > bore
|
||
}
|
||
|
||
|
||
b64Chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
|
||
function toBase64(buf) {
|
||
var r = '', i = 0, indexOfLastCompleteTriple = buf.length - (buf.length%3);
|
||
for (i = 0; i < indexOfLastCompleteTriple; i += 3) {
|
||
r += b64Chars[buf[i] >> 2];
|
||
r += b64Chars[((buf[i] & 3) << 4) | ((buf[i+1] & 0xF0) >> 4)];
|
||
r += b64Chars[((buf[i+1] & 0xF) << 2) | ((buf[i+2] & 0xC0) >> 6)];
|
||
r += b64Chars[buf[i+2] & 0x3F]
|
||
}
|
||
if (i < buf.length) {
|
||
var i1 = buf[i], i2 = (i+1 < buf.length) ? buf[i+1] : 0;
|
||
r += b64Chars[i1 >> 2];
|
||
r += b64Chars[((i1 & 0x03) << 4) | ((i2 & 0xF0) >> 4)];
|
||
if (i+1 < buf.length) {
|
||
r += b64Chars[((i2 & 0x0F) << 2)];
|
||
}
|
||
else r += '=';
|
||
r += '=';
|
||
}
|
||
return r
|
||
}
|
||
|
||
|
||
function _logBase64(buf) { //simply plops the buffer contents into log stream with a suitable MIME header
|
||
var fn = File.getFileBaseName()+'.'+File.getFileCompleteSuffix();
|
||
_log('MIME-Version: 1.0\nContent-Type: application/octet-stream; name="'+fn+'.dec"\n'+
|
||
'Content-Transfer-Encoding: base64\nContent-Disposition: attachment; filename="'+fn+'.dec"\n');
|
||
_log(buf)
|
||
}
|
||
|
||
|
||
function _logHex(buf) { //same but no header and in hex
|
||
var o = ''; for(i=0; i < buf.length; i++) {
|
||
if(!(i % 16)) o += (i? ' |\n': '')+i.toString(16).padStart(6,'0')+' |'; if(!(i % 8)) o += ' ';
|
||
o += ' '+buf[i].toString(16).padStart(2,'0');
|
||
}
|
||
_log('-8<---'); _log(o); _log('--->8-')
|
||
}
|
||
|
||
|
||
function _logText(buf) { //same but as text put through CP866, or all file with zeroes as spaces and control characters as emoji
|
||
_log('-8<---['+(typeof buf)+' '+(buf.length)+' bytes]---');
|
||
if(typeof buf === 'object') {
|
||
var bf = buf, i = 0; for(; i < buf.length; i++) if(bf[i] == 0) bf[i] = 0x20
|
||
}
|
||
_log(decEncoding((typeof buf === 'undefined'? X.readBytes(0,X.Sz(),true): bf), CP866, Chars0to1F));
|
||
_log('--->8-')
|
||
}
|
||
|
||
|
||
function _l2r(name, pos, issue) { _setResult('debug', issue, '@'+Hex(pos), name) }
|
||
/* beautify ignore:end */ |