zipyai/dist/zipy.esm.js

SDK for zipy

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to read this code, you should probably check the RFC first:\n\n// aliases for shorter compressed code (most minifers don\'t do this)\nvar u8 = Uint8Array, u16 = Uint16Array, i32 = Int32Array;\n// fixed length extra bits\nvar fleb = new u8([0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, /* unused */ 0, 0, /* impossible */ 0]);\n// fixed distance extra bits\nvar fdeb = new u8([0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13, /* unused */ 0, 0]);\n// code length index map\nvar clim = new u8([16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15]);\n// get base, reverse index map from extra bits\nvar freb = function (eb, start) {\n    var b = new u16(31);\n    for (var i = 0; i < 31; ++i) {\n        b[i] = start += 1 << eb[i - 1];\n    }\n    // numbers here are at max 18 bits\n    var r = new i32(b[30]);\n    for (var i = 1; i < 30; ++i) {\n        for (var j = b[i]; j < b[i + 1]; ++j) {\n            r[j] = ((j - b[i]) << 5) | i;\n        }\n    }\n    return { b: b, r: r };\n};\nvar _a = freb(fleb, 2), fl = _a.b, revfl = _a.r;\n// we can ignore the fact that the other numbers are wrong; they never happen anyway\nfl[28] = 258, revfl[258] = 28;\nvar _b = freb(fdeb, 0), revfd = _b.r;\n// map of value to reverse (assuming 16 bits)\nvar rev = new u16(32768);\nfor (var i = 0; i < 32768; ++i) {\n    // reverse table algorithm from SO\n    var x = ((i & 0xAAAA) >> 1) | ((i & 0x5555) << 1);\n    x = ((x & 0xCCCC) >> 2) | ((x & 0x3333) << 2);\n    x = ((x & 0xF0F0) >> 4) | ((x & 0x0F0F) << 4);\n    rev[i] = (((x & 0xFF00) >> 8) | ((x & 0x00FF) << 8)) >> 1;\n}\n// create huffman tree from u8 "map": index -> code length for code index\n// mb (max bits) must be at most 15\n// TODO: optimize/split up?\nvar hMap = (function (cd, mb, r) {\n    var s = cd.length;\n    // index\n    var i = 0;\n    // u16 "map": index -> # of codes with bit length = index\n    var l = new u16(mb);\n    // length of cd must be 288 (total # of codes)\n    for (; i < s; ++i) {\n        if (cd[i])\n            ++l[cd[i] - 1];\n    }\n    // u16 "map": index -> minimum code for bit length = index\n    var le = new u16(mb);\n    for (i = 1; i < mb; ++i) {\n        le[i] = (le[i - 1] + l[i - 1]) << 1;\n    }\n    var co;\n    if (r) {\n        // u16 "map": index -> number of actual bits, symbol for code\n        co = new u16(1 << mb);\n        // bits to remove for reverser\n        var rvb = 15 - mb;\n        for (i = 0; i < s; ++i) {\n            // ignore 0 lengths\n            if (cd[i]) {\n                // num encoding both symbol and bits read\n                var sv = (i << 4) | cd[i];\n                // free bits\n                var r_1 = mb - cd[i];\n                // start value\n                var v = le[cd[i] - 1]++ << r_1;\n                // m is end value\n                for (var m = v | ((1 << r_1) - 1); v <= m; ++v) {\n                    // every 16 bit value starting with the code yields the same result\n                    co[rev[v] >> rvb] = sv;\n                }\n            }\n        }\n    }\n    else {\n        co = new u16(s);\n        for (i = 0; i < s; ++i) {\n            if (cd[i]) {\n                co[i] = rev[le[cd[i] - 1]++] >> (15 - cd[i]);\n            }\n        }\n    }\n    return co;\n});\n// fixed length tree\nvar flt = new u8(288);\nfor (var i = 0; i < 144; ++i)\n    flt[i] = 8;\nfor (var i = 144; i < 256; ++i)\n    flt[i] = 9;\nfor (var i = 256; i < 280; ++i)\n    flt[i] = 7;\nfor (var i = 280; i < 288; ++i)\n    flt[i] = 8;\n// fixed distance tree\nvar fdt = new u8(32);\nfor (var i = 0; i < 32; ++i)\n    fdt[i] = 5;\n// fixed length map\nvar flm = /*#__PURE__*/ hMap(flt, 9, 0);\n// fixed distance map\nvar fdm = /*#__PURE__*/ hMap(fdt, 5, 0);\n// get end of byte\nvar shft = function (p) { return ((p + 7) / 8) | 0; };\n// typed array slice - allows garbage collector to free original reference,\n// while being more compatible than .slice\nvar slc = function (v, s, e) {\n    if (s == null || s < 0)\n        s = 0;\n    if (e == null || e > v.length)\n        e = v.length;\n    // can\'t use .constructor in case user-supplied\n    return new u8(v.subarray(s, e));\n};\n// starting at p, write the minimum number of bits that can hold v to d\nvar wbits = function (d, p, v) {\n    v <<= p & 7;\n    var o = (p / 8) | 0;\n    d[o] |= v;\n    d[o + 1] |= v >> 8;\n};\n// starting at p, write the minimum number of bits (>8) that can hold v to d\nvar wbits16 = function (d, p, v) {\n    v <<= p & 7;\n    var o = (p / 8) | 0;\n    d[o] |= v;\n    d[o + 1] |= v >> 8;\n    d[o + 2] |= v >> 16;\n};\n// creates code lengths from a frequency table\nvar hTree = function (d, mb) {\n    // Need extra info to make a tree\n    var t = [];\n    for (var i = 0; i < d.length; ++i) {\n        if (d[i])\n            t.push({ s: i, f: d[i] });\n    }\n    var s = t.length;\n    var t2 = t.slice();\n    if (!s)\n        return { t: et, l: 0 };\n    if (s == 1) {\n        var v = new u8(t[0].s + 1);\n        v[t[0].s] = 1;\n        return { t: v, l: 1 };\n    }\n    t.sort(function (a, b) { return a.f - b.f; });\n    // after i2 reaches last ind, will be stopped\n    // freq must be greater than largest possible number of symbols\n    t.push({ s: -1, f: 25001 });\n    var l = t[0], r = t[1], i0 = 0, i1 = 1, i2 = 2;\n    t[0] = { s: -1, f: l.f + r.f, l: l, r: r };\n    // efficient algorithm from UZIP.js\n    // i0 is lookbehind, i2 is lookahead - after processing two low-freq\n    // symbols that combined have high freq, will start processing i2 (high-freq,\n    // non-composite) symbols instead\n    // see https://reddit.com/r/photopea/comments/ikekht/uzipjs_questions/\n    while (i1 != s - 1) {\n        l = t[t[i0].f < t[i2].f ? i0++ : i2++];\n        r = t[i0 != i1 && t[i0].f < t[i2].f ? i0++ : i2++];\n        t[i1++] = { s: -1, f: l.f + r.f, l: l, r: r };\n    }\n    var maxSym = t2[0].s;\n    for (var i = 1; i < s; ++i) {\n        if (t2[i].s > maxSym)\n            maxSym = t2[i].s;\n    }\n    // code lengths\n    var tr = new u16(maxSym + 1);\n    // max bits in tree\n    var mbt = ln(t[i1 - 1], tr, 0);\n    if (mbt > mb) {\n        // more algorithms from UZIP.js\n        // TODO: find out how this code works (debt)\n        //  ind    debt\n        var i = 0, dt = 0;\n        //    left            cost\n        var lft = mbt - mb, cst = 1 << lft;\n        t2.sort(function (a, b) { return tr[b.s] - tr[a.s] || a.f - b.f; });\n        for (; i < s; ++i) {\n            var i2_1 = t2[i].s;\n            if (tr[i2_1] > mb) {\n                dt += cst - (1 << (mbt - tr[i2_1]));\n                tr[i2_1] = mb;\n            }\n            else\n                break;\n        }\n        dt >>= lft;\n        while (dt > 0) {\n            var i2_2 = t2[i].s;\n            if (tr[i2_2] < mb)\n                dt -= 1 << (mb - tr[i2_2]++ - 1);\n            else\n                ++i;\n        }\n        for (; i >= 0 && dt; --i) {\n            var i2_3 = t2[i].s;\n            if (tr[i2_3] == mb) {\n                --tr[i2_3];\n                ++dt;\n            }\n        }\n        mbt = mb;\n    }\n    return { t: new u8(tr), l: mbt };\n};\n// get the max length and assign length codes\nvar ln = function (n, l, d) {\n    return n.s == -1\n        ? Math.max(ln(n.l, l, d + 1), ln(n.r, l, d + 1))\n        : (l[n.s] = d);\n};\n// length codes generation\nvar lc = function (c) {\n    var s = c.length;\n    // Note that the semicolon was intentional\n    while (s && !c[--s])\n        ;\n    var cl = new u16(++s);\n    //  ind      num         streak\n    var cli = 0, cln = c[0], cls = 1;\n    var w = function (v) { cl[cli++] = v; };\n    for (var i = 1; i <= s; ++i) {\n        if (c[i] == cln && i != s)\n            ++cls;\n        else {\n            if (!cln && cls > 2) {\n                for (; cls > 138; cls -= 138)\n                    w(32754);\n                if (cls > 2) {\n                    w(cls > 10 ? ((cls - 11) << 5) | 28690 : ((cls - 3) << 5) | 12305);\n                    cls = 0;\n                }\n            }\n            else if (cls > 3) {\n                w(cln), --cls;\n                for (; cls > 6; cls -= 6)\n                    w(8304);\n                if (cls > 2)\n                    w(((cls - 3) << 5) | 8208), cls = 0;\n            }\n            while (cls--)\n                w(cln);\n            cls = 1;\n            cln = c[i];\n        }\n    }\n    return { c: cl.subarray(0, cli), n: s };\n};\n// calculate the length of output from tree, code lengths\nvar clen = function (cf, cl) {\n    var l = 0;\n    for (var i = 0; i < cl.length; ++i)\n        l += cf[i] * cl[i];\n    return l;\n};\n// writes a fixed block\n// returns the new bit pos\nvar wfblk = function (out, pos, dat) {\n    // no need to write 00 as type: TypedArray defaults to 0\n    var s = dat.length;\n    var o = shft(pos + 2);\n    out[o] = s & 255;\n    out[o + 1] = s >> 8;\n    out[o + 2] = out[o] ^ 255;\n    out[o + 3] = out[o + 1] ^ 255;\n    for (var i = 0; i < s; ++i)\n        out[o + i + 4] = dat[i];\n    return (o + 4 + s) * 8;\n};\n// writes a block\nvar wblk = function (dat, out, final, syms, lf, df, eb, li, bs, bl, p) {\n    wbits(out, p++, final);\n    ++lf[256];\n    var _a = hTree(lf, 15), dlt = _a.t, mlb = _a.l;\n    var _b = hTree(df, 15), ddt = _b.t, mdb = _b.l;\n    var _c = lc(dlt), lclt = _c.c, nlc = _c.n;\n    var _d = lc(ddt), lcdt = _d.c, ndc = _d.n;\n    var lcfreq = new u16(19);\n    for (var i = 0; i < lclt.length; ++i)\n        ++lcfreq[lclt[i] & 31];\n    for (var i = 0; i < lcdt.length; ++i)\n        ++lcfreq[lcdt[i] & 31];\n    var _e = hTree(lcfreq, 7), lct = _e.t, mlcb = _e.l;\n    var nlcc = 19;\n    for (; nlcc > 4 && !lct[clim[nlcc - 1]]; --nlcc)\n        ;\n    var flen = (bl + 5) << 3;\n    var ftlen = clen(lf, flt) + clen(df, fdt) + eb;\n    var dtlen = clen(lf, dlt) + clen(df, ddt) + eb + 14 + 3 * nlcc + clen(lcfreq, lct) + 2 * lcfreq[16] + 3 * lcfreq[17] + 7 * lcfreq[18];\n    if (bs >= 0 && flen <= ftlen && flen <= dtlen)\n        return wfblk(out, p, dat.subarray(bs, bs + bl));\n    var lm, ll, dm, dl;\n    wbits(out, p, 1 + (dtlen < ftlen)), p += 2;\n    if (dtlen < ftlen) {\n        lm = hMap(dlt, mlb, 0), ll = dlt, dm = hMap(ddt, mdb, 0), dl = ddt;\n        var llm = hMap(lct, mlcb, 0);\n        wbits(out, p, nlc - 257);\n        wbits(out, p + 5, ndc - 1);\n        wbits(out, p + 10, nlcc - 4);\n        p += 14;\n        for (var i = 0; i < nlcc; ++i)\n            wbits(out, p + 3 * i, lct[clim[i]]);\n        p += 3 * nlcc;\n        var lcts = [lclt, lcdt];\n        for (var it = 0; it < 2; ++it) {\n            var clct = lcts[it];\n            for (var i = 0; i < clct.length; ++i) {\n                var len = clct[i] & 31;\n                wbits(out, p, llm[len]), p += lct[len];\n                if (len > 15)\n                    wbits(out, p, (clct[i] >> 5) & 127), p += clct[i] >> 12;\n            }\n        }\n    }\n    else {\n        lm = flm, ll = flt, dm = fdm, dl = fdt;\n    }\n    for (var i = 0; i < li; ++i) {\n        var sym = syms[i];\n        if (sym > 255) {\n            var len = (sym >> 18) & 31;\n            wbits16(out, p, lm[len + 257]), p += ll[len + 257];\n            if (len > 7)\n                wbits(out, p, (sym >> 23) & 31), p += fleb[len];\n            var dst = sym & 31;\n            wbits16(out, p, dm[dst]), p += dl[dst];\n            if (dst > 3)\n                wbits16(out, p, (sym >> 5) & 8191), p += fdeb[dst];\n        }\n        else {\n            wbits16(out, p, lm[sym]), p += ll[sym];\n        }\n    }\n    wbits16(out, p, lm[256]);\n    return p + ll[256];\n};\n// deflate options (nice << 13) | chain\nvar deo = /*#__PURE__*/ new i32([65540, 131080, 131088, 131104, 262176, 1048704, 1048832, 2114560, 2117632]);\n// empty\nvar et = /*#__PURE__*/ new u8(0);\n// compresses data into a raw DEFLATE buffer\nvar dflt = function (dat, lvl, plvl, pre, post, st) {\n    var s = st.z || dat.length;\n    var o = new u8(pre + s + 5 * (1 + Math.ceil(s / 7000)) + post);\n    // writing to this writes to the output buffer\n    var w = o.subarray(pre, o.length - post);\n    var lst = st.l;\n    var pos = (st.r || 0) & 7;\n    if (lvl) {\n        if (pos)\n            w[0] = st.r >> 3;\n        var opt = deo[lvl - 1];\n        var n = opt >> 13, c = opt & 8191;\n        var msk_1 = (1 << plvl) - 1;\n        //    prev 2-byte val map    curr 2-byte val map\n        var prev = st.p || new u16(32768), head = st.h || new u16(msk_1 + 1);\n        var bs1_1 = Math.ceil(plvl / 3), bs2_1 = 2 * bs1_1;\n        var hsh = function (i) { return (dat[i] ^ (dat[i + 1] << bs1_1) ^ (dat[i + 2] << bs2_1)) & msk_1; };\n        // 24576 i