StringView.js

/*\
|*|
|*|  :: Number.isInteger() polyfill ::
|*|
|*|  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isInteger
|*|
\*/

if (!Number.isInteger) {
    Number.isInteger = function isInteger(nVal) {
        return typeof nVal === "number" && isFinite(nVal) && nVal > -9007199254740992 && nVal < 9007199254740992 && Math.floor(nVal) === nVal;
    };
}

/*\
|*|
|*|  StringView - Mozilla Developer Network - revision #6
|*|
|*|  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays/StringView
|*|  https://developer.mozilla.org/User:fusionchess
|*|
|*|  This framework is released under the GNU Public License, version 3 or later.
|*|  http://www.gnu.org/licenses/gpl-3.0-standalone.html
|*|
\*/

function StringView(vInput, sEncoding /* optional (default: UTF-8) */, nOffset /* optional */, nLength /* optional */) {

    var fTAView, aWhole, aRaw, fPutOutptCode, fGetOutptChrSize, nInptLen, nStartIdx = isFinite(nOffset) ? nOffset : 0, nTranscrType = 15;

    if (sEncoding) { this.encoding = sEncoding.toString(); }

    encSwitch: switch (this.encoding) {
        case "UTF-8":
            fPutOutptCode = StringView.putUTF8CharCode;
            fGetOutptChrSize = StringView.getUTF8CharLength;
            fTAView = Uint8Array;
            break encSwitch;
        case "UTF-16":
            fPutOutptCode = StringView.putUTF16CharCode;
            fGetOutptChrSize = StringView.getUTF16CharLength;
            fTAView = Uint16Array;
            break encSwitch;
        case "UTF-32":
            fTAView = Uint32Array;
            nTranscrType &= 14;
            break encSwitch;
        default:
            /* case "ASCII", or case "BinaryString" or unknown cases */
            fTAView = Uint8Array;
            nTranscrType &= 14;
    }

    typeSwitch: switch (typeof vInput) {
        case "string":
            /* the input argument is a primitive string: a new buffer will be created. */
            nTranscrType &= 7;
            break typeSwitch;
        case "object":
            classSwitch: switch (vInput.constructor) {
                case StringView:
                    /* the input argument is a stringView: a new buffer will be created. */
                    nTranscrType &= 3;
                    break typeSwitch;
                case String:
                    /* the input argument is an objectified string: a new buffer will be created. */
                    nTranscrType &= 7;
                    break typeSwitch;
                case ArrayBuffer:
                    /* the input argument is an arrayBuffer: the buffer will be shared. */
                    aWhole = new fTAView(vInput);
                    nInptLen = this.encoding === "UTF-32" ?
                        vInput.byteLength >>> 2
                      : this.encoding === "UTF-16" ?
                        vInput.byteLength >>> 1
                      :
                        vInput.byteLength;
                    aRaw = nStartIdx === 0 && (!isFinite(nLength) || nLength === nInptLen) ?
                        aWhole
                      : new fTAView(vInput, nStartIdx, !isFinite(nLength) ? nInptLen - nStartIdx : nLength);

                    break typeSwitch;
                case Uint32Array:
                case Uint16Array:
                case Uint8Array:
                    /* the input argument is a typedArray: the buffer, and possibly the array itself, will be shared. */
                    fTAView = vInput.constructor;
                    nInptLen = vInput.length;
                    aWhole = vInput.byteOffset === 0 && vInput.length === (
                      fTAView === Uint32Array ?
                        vInput.buffer.byteLength >>> 2
                      : fTAView === Uint16Array ?
                        vInput.buffer.byteLength >>> 1
                      :
                        vInput.buffer.byteLength
                    ) ? vInput : new fTAView(vInput.buffer);
                    aRaw = nStartIdx === 0 && (!isFinite(nLength) || nLength === nInptLen) ?
                        vInput
                      : vInput.subarray(nStartIdx, isFinite(nLength) ? nStartIdx + nLength : nInptLen);

                    break typeSwitch;
                default:
                    /* the input argument is an array or another serializable object: a new typedArray will be created. */
                    aWhole = new fTAView(vInput);
                    nInptLen = aWhole.length;
                    aRaw = nStartIdx === 0 && (!isFinite(nLength) || nLength === nInptLen) ?
                        aWhole
                      : aWhole.subarray(nStartIdx, isFinite(nLength) ? nStartIdx + nLength : nInptLen);
            }
            break typeSwitch;
        default:
            /* the input argument is a number, a boolean or a function: a new typedArray will be created. */
            aWhole = aRaw = new fTAView(Number(vInput) || 0);

    }

    if (nTranscrType < 8) {

        var vSource, nOutptLen, nCharStart, nCharEnd, nEndIdx, fGetInptChrSize, fGetInptChrCode;

        if (nTranscrType & 4) { /* input is string */

            vSource = vInput;
            nOutptLen = nInptLen = vSource.length;
            nTranscrType ^= this.encoding === "UTF-32" ? 0 : 2;
            /* ...or...: nTranscrType ^= Number(this.encoding !== "UTF-32") << 1; */
            nStartIdx = nCharStart = nOffset ? Math.max((nOutptLen + nOffset) % nOutptLen, 0) : 0;
            nEndIdx = nCharEnd = (Number.isInteger(nLength) ? Math.min(Math.max(nLength, 0) + nStartIdx, nOutptLen) : nOutptLen) - 1;

        } else { /* input is stringView */

            vSource = vInput.rawData;
            nInptLen = vInput.makeIndex();
            nStartIdx = nCharStart = nOffset ? Math.max((nInptLen + nOffset) % nInptLen, 0) : 0;
            nOutptLen = Number.isInteger(nLength) ? Math.min(Math.max(nLength, 0), nInptLen - nCharStart) : nInptLen;
            nEndIdx = nCharEnd = nOutptLen + nCharStart;

            if (vInput.encoding === "UTF-8") {
                fGetInptChrSize = StringView.getUTF8CharLength;
                fGetInptChrCode = StringView.loadUTF8CharCode;
            } else if (vInput.encoding === "UTF-16") {
                fGetInptChrSize = StringView.getUTF16CharLength;
                fGetInptChrCode = StringView.loadUTF16CharCode;
            } else {
                nTranscrType &= 1;
            }

        }

        if (nOutptLen === 0 || nTranscrType < 4 && vSource.encoding === this.encoding && nCharStart === 0 && nOutptLen === nInptLen) {

            /* the encoding is the same, the length too and the offset is 0... or the input is empty! */

            nTranscrType = 7;

        }

        conversionSwitch: switch (nTranscrType) {

            case 0:

                /* both the source and the new StringView have a fixed-length encoding... */

                aWhole = new fTAView(nOutptLen);
                for (var nOutptIdx = 0; nOutptIdx < nOutptLen; aWhole[nOutptIdx] = vSource[nStartIdx + nOutptIdx++]);
                break conversionSwitch;

            case 1:

                /* the source has a fixed-length encoding but the new StringView has a variable-length encoding... */

                /* mapping... */

                nOutptLen = 0;

                for (var nInptIdx = nStartIdx; nInptIdx < nEndIdx; nInptIdx++) {
                    nOutptLen += fGetOutptChrSize(vSource[nInptIdx]);
                }

                aWhole = new fTAView(nOutptLen);

                /* transcription of the source... */

                for (var nInptIdx = nStartIdx, nOutptIdx = 0; nOutptIdx < nOutptLen; nInptIdx++) {
                    nOutptIdx = fPutOutptCode(aWhole, vSource[nInptIdx], nOutptIdx);
                }

                break conversionSwitch;

            case 2:

                /* the source has a variable-length encoding but the new StringView has a fixed-length encoding... */

                /* mapping... */

                nStartIdx = 0;

                var nChrCode;

                for (nChrIdx = 0; nChrIdx < nCharStart; nChrIdx++) {
                    nChrCode = fGetInptChrCode(vSource, nStartIdx);
                    nStartIdx += fGetInptChrSize(nChrCode);
                }

                aWhole = new fTAView(nOutptLen);

                /* transcription of the source... */

                for (var nInptIdx = nStartIdx, nOutptIdx = 0; nOutptIdx < nOutptLen; nInptIdx += fGetInptChrSize(nChrCode), nOutptIdx++) {
                    nChrCode = fGetInptChrCode(vSource, nInptIdx);
                    aWhole[nOutptIdx] = nChrCode;
                }

                break conversionSwitch;

            case 3:

                /* both the source and the new StringView have a variable-length encoding... */

                /* mapping... */

                nOutptLen = 0;

                var nChrCode;

                for (var nChrIdx = 0, nInptIdx = 0; nChrIdx < nCharEnd; nInptIdx += fGetInptChrSize(nChrCode)) {
                    nChrCode = fGetInptChrCode(vSource, nInptIdx);
                    if (nChrIdx === nCharStart) { nStartIdx = nInptIdx; }
                    if (++nChrIdx > nCharStart) { nOutptLen += fGetOutptChrSize(nChrCode); }
                }

                aWhole = new fTAView(nOutptLen);

                /* transcription... */

                for (var nInptIdx = nStartIdx, nOutptIdx = 0; nOutptIdx < nOutptLen; nInptIdx += fGetInptChrSize(nChrCode)) {
                    nChrCode = fGetInptChrCode(vSource, nInptIdx);
                    nOutptIdx = fPutOutptCode(aWhole, nChrCode, nOutptIdx);
                }

                break conversionSwitch;

            case 4:

                /* DOMString to ASCII or BinaryString or other unknown encodings */

                aWhole = new fTAView(nOutptLen);

                /* transcription... */

                for (var nIdx = 0; nIdx < nOutptLen; nIdx++) {
                    aWhole[nIdx] = vSource.charCodeAt(nIdx) & 0xff;
                }

                break conversionSwitch;

            case 5:

                /* DOMString to UTF-8 or to UTF-16 */

                /* mapping... */

                nOutptLen = 0;

                for (var nMapIdx = 0; nMapIdx < nInptLen; nMapIdx++) {
                    if (nMapIdx === nCharStart) { nStartIdx = nOutptLen; }
                    nOutptLen += fGetOutptChrSize(vSource.charCodeAt(nMapIdx));
                    if (nMapIdx === nCharEnd) { nEndIdx = nOutptLen; }
                }

                aWhole = new fTAView(nOutptLen);

                /* transcription... */

                for (var nOutptIdx = 0, nChrIdx = 0; nOutptIdx < nOutptLen; nChrIdx++) {
                    nOutptIdx = fPutOutptCode(aWhole, vSource.charCodeAt(nChrIdx), nOutptIdx);
                }

                break conversionSwitch;

            case 6:

                /* DOMString to UTF-32 */

                aWhole = new fTAView(nOutptLen);

                /* transcription... */

                for (var nIdx = 0; nIdx < nOutptLen; nIdx++) {
                    aWhole[nIdx] = vSource.charCodeAt(nIdx);
                }

                break conversionSwitch;

            case 7:

                aWhole = new fTAView(nOutptLen ? vSource : 0);
                break conversionSwitch;

        }

        aRaw = nTranscrType > 3 && (nStartIdx > 0 || nEndIdx < aWhole.length - 1) ? aWhole.subarray(nStartIdx, nEndIdx) : aWhole;

    }

    this.buffer = aWhole.buffer;
    this.bufferView = aWhole;
    this.rawData = aRaw;

    Object.freeze(this);

}

/* CONSTRUCTOR'S METHODS */

StringView.loadUTF8CharCode = function (aChars, nIdx) {

    var nLen = aChars.length, nPart = aChars[nIdx];

    return nPart > 251 && nPart < 254 && nIdx + 5 < nLen ?
        /* (nPart - 252 << 32) is not possible in ECMAScript! So...: */
        /* six bytes */ (nPart - 252) * 1073741824 + (aChars[nIdx + 1] - 128 << 24) + (aChars[nIdx + 2] - 128 << 18) + (aChars[nIdx + 3] - 128 << 12) + (aChars[nIdx + 4] - 128 << 6) + aChars[nIdx + 5] - 128
      : nPart > 247 && nPart < 252 && nIdx + 4 < nLen ?
        /* five bytes */ (nPart - 248 << 24) + (aChars[nIdx + 1] - 128 << 18) + (aChars[nIdx + 2] - 128 << 12) + (aChars[nIdx + 3] - 128 << 6) + aChars[nIdx + 4] - 128
      : nPart > 239 && nPart < 248 && nIdx + 3 < nLen ?
        /* four bytes */(nPart - 240 << 18) + (aChars[nIdx + 1] - 128 << 12) + (aChars[nIdx + 2] - 128 << 6) + aChars[nIdx + 3] - 128
      : nPart > 223 && nPart < 240 && nIdx + 2 < nLen ?
        /* three bytes */ (nPart - 224 << 12) + (aChars[nIdx + 1] - 128 << 6) + aChars[nIdx + 2] - 128
      : nPart > 191 && nPart < 224 && nIdx + 1 < nLen ?
        /* two bytes */ (nPart - 192 << 6) + aChars[nIdx + 1] - 128
      :
        /* one byte */ nPart;

};

StringView.putUTF8CharCode = function (aTarget, nChar, nPutAt) {

    var nIdx = nPutAt;

    if (nChar < 0x80 /* 128 */) {
        /* one byte */
        aTarget[nIdx++] = nChar;
    } else if (nChar < 0x800 /* 2048 */) {
        /* two bytes */
        aTarget[nIdx++] = 0xc0 /* 192 */ + (nChar >>> 6);
        aTarget[nIdx++] = 0x80 /* 128 */ + (nChar & 0x3f /* 63 */);
    } else if (nChar < 0x10000 /* 65536 */) {
        /* three bytes */
        aTarget[nIdx++] = 0xe0 /* 224 */ + (nChar >>> 12);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 6) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + (nChar & 0x3f /* 63 */);
    } else if (nChar < 0x200000 /* 2097152 */) {
        /* four bytes */
        aTarget[nIdx++] = 0xf0 /* 240 */ + (nChar >>> 18);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 12) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 6) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + (nChar & 0x3f /* 63 */);
    } else if (nChar < 0x4000000 /* 67108864 */) {
        /* five bytes */
        aTarget[nIdx++] = 0xf8 /* 248 */ + (nChar >>> 24);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 18) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 12) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 6) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + (nChar & 0x3f /* 63 */);
    } else /* if (nChar <= 0x7fffffff) */ { /* 2147483647 */
        /* six bytes */
        aTarget[nIdx++] = 0xfc /* 252 */ + /* (nChar >>> 32) is not possible in ECMAScript! So...: */ (nChar / 1073741824);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 24) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 18) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 12) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + ((nChar >>> 6) & 0x3f /* 63 */);
        aTarget[nIdx++] = 0x80 /* 128 */ + (nChar & 0x3f /* 63 */);
    }

    return nIdx;

};

StringView.getUTF8CharLength = function (nChar) {
    return nChar < 0x80 ? 1 : nChar < 0x800 ? 2 : nChar < 0x10000 ? 3 : nChar < 0x200000 ? 4 : nChar < 0x4000000 ? 5 : 6;
};

StringView.loadUTF16CharCode = function (aChars, nIdx) {

    /* UTF-16 to DOMString decoding algorithm */
    var nFrstChr = aChars[nIdx];

    return nFrstChr > 0xD7BF /* 55231 */ && nIdx + 1 < aChars.length ?
      (nFrstChr - 0xD800 /* 55296 */ << 10) + aChars[nIdx + 1] + 0x2400 /* 9216 */
      : nFrstChr;

};

StringView.putUTF16CharCode = function (aTarget, nChar, nPutAt) {

    var nIdx = nPutAt;

    if (nChar < 0x10000 /* 65536 */) {
        /* one element */
        aTarget[nIdx++] = nChar;
    } else {
        /* two elements */
        aTarget[nIdx++] = 0xD7C0 /* 55232 */ + (nChar >>> 10);
        aTarget[nIdx++] = 0xDC00 /* 56320 */ + (nChar & 0x3FF /* 1023 */);
    }

    return nIdx;

};

StringView.getUTF16CharLength = function (nChar) {
    return nChar < 0x10000 ? 1 : 2;
};

/* Array of bytes to base64 string decoding */

StringView.b64ToUint6 = function (nChr) {

    return nChr > 64 && nChr < 91 ?
        nChr - 65
      : nChr > 96 && nChr < 123 ?
        nChr - 71
      : nChr > 47 && nChr < 58 ?
        nChr + 4
      : nChr === 43 ?
        62
      : nChr === 47 ?
        63
      :
        0;

};

StringView.uint6ToB64 = function (nUint6) {

    return nUint6 < 26 ?
        nUint6 + 65
      : nUint6 < 52 ?
        nUint6 + 71
      : nUint6 < 62 ?
        nUint6 - 4
      : nUint6 === 62 ?
        43
      : nUint6 === 63 ?
        47
      :
        65;

};

/* Base64 string to array encoding */

StringView.bytesToBase64 = function (aBytes) {

    var sB64Enc = "";

    for (var nMod3, nLen = aBytes.length, nUint24 = 0, nIdx = 0; nIdx < nLen; nIdx++) {
        nMod3 = nIdx % 3;
        if (nIdx > 0 && (nIdx * 4 / 3) % 76 === 0) { sB64Enc += "\r\n"; }
        nUint24 |= aBytes[nIdx] << (16 >>> nMod3 & 24);
        if (nMod3 === 2 || aBytes.length - nIdx === 1) {
            sB64Enc += String.fromCharCode(StringView.uint6ToB64(nUint24 >>> 18 & 63), StringView.uint6ToB64(nUint24 >>> 12 & 63), StringView.uint6ToB64(nUint24 >>> 6 & 63), StringView.uint6ToB64(nUint24 & 63));
            nUint24 = 0;
        }
    }

    return sB64Enc.replace(/A(?=A$|$)/g, "=");

};


StringView.base64ToBytes = function (sBase64, nBlockBytes) {

    var
      sB64Enc = sBase64.replace(/[^A-Za-z0-9\+\/]/g, ""), nInLen = sB64Enc.length,
      nOutLen = nBlockBytes ? Math.ceil((nInLen * 3 + 1 >>> 2) / nBlockBytes) * nBlockBytes : nInLen * 3 + 1 >>> 2, aBytes = new Uint8Array(nOutLen);

    for (var nMod3, nMod4, nUint24 = 0, nOutIdx = 0, nInIdx = 0; nInIdx < nInLen; nInIdx++) {
        nMod4 = nInIdx & 3;
        nUint24 |= StringView.b64ToUint6(sB64Enc.charCodeAt(nInIdx)) << 18 - 6 * nMod4;
        if (nMod4 === 3 || nInLen - nInIdx === 1) {
            for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) {
                aBytes[nOutIdx] = nUint24 >>> (16 >>> nMod3 & 24) & 255;
            }
            nUint24 = 0;
        }
    }

    return aBytes;

};

StringView.makeFromBase64 = function (sB64Inpt, sEncoding, nByteOffset, nLength) {

    return new StringView(sEncoding === "UTF-16" || sEncoding === "UTF-32" ? StringView.base64ToBytes(sB64Inpt, sEncoding === "UTF-16" ? 2 : 4).buffer : StringView.base64ToBytes(sB64Inpt), sEncoding, nByteOffset, nLength);

};

/* DEFAULT VALUES */

StringView.prototype.encoding = "UTF-8"; /* Default encoding... */

/* INSTANCES' METHODS */

StringView.prototype.makeIndex = function (nChrLength, nStartFrom) {

    var

      aTarget = this.rawData, nChrEnd, nRawLength = aTarget.length,
      nStartIdx = nStartFrom || 0, nIdxEnd = nStartIdx, nStopAtChr = isNaN(nChrLength) ? Infinity : nChrLength;

    if (nChrLength + 1 > aTarget.length) { throw new RangeError("StringView.prototype.makeIndex - The offset can\'t be major than the length of the array - 1."); }

    switch (this.encoding) {

        case "UTF-8":

            var nPart;

            for (nChrEnd = 0; nIdxEnd < nRawLength && nChrEnd < nStopAtChr; nChrEnd++) {
                nPart = aTarget[nIdxEnd];
                nIdxEnd += nPart > 251 && nPart < 254 && nIdxEnd + 5 < nRawLength ? 6
                  : nPart > 247 && nPart < 252 && nIdxEnd + 4 < nRawLength ? 5
                  : nPart > 239 && nPart < 248 && nIdxEnd + 3 < nRawLength ? 4
                  : nPart > 223 && nPart < 240 && nIdxEnd + 2 < nRawLength ? 3
                  : nPart > 191 && nPart < 224 && nIdxEnd + 1 < nRawLength ? 2
                  : 1;
            }

            break;

        case "UTF-16":

            for (nChrEnd = nStartIdx; nIdxEnd < nRawLength && nChrEnd < nStopAtChr; nChrEnd++) {
                nIdxEnd += aTarget[nIdxEnd] > 0xD7BF /* 55231 */ && nIdxEnd + 1 < aTarget.length ? 2 : 1;
            }

            break;

        default:

            nIdxEnd = nChrEnd = isFinite(nChrLength) ? nChrLength : nRawLength - 1;

    }

    if (nChrLength) { return nIdxEnd; }

    return nChrEnd;

};

StringView.prototype.toBase64 = function (bWholeBuffer) {

    return StringView.bytesToBase64(
      bWholeBuffer ?
        (
          this.bufferView.constructor === Uint8Array ?
            this.bufferView
          :
            new Uint8Array(this.buffer)
        )
      : this.rawData.constructor === Uint8Array ?
        this.rawData
      :
        new Uint8Array(this.buffer, this.rawData.byteOffset, this.rawData.length << (this.rawData.constructor === Uint16Array ? 1 : 2))
      );

};

StringView.prototype.subview = function (nCharOffset /* optional */, nCharLength /* optional */) {

    var

      nChrLen, nCharStart, nStrLen, bVariableLen = this.encoding === "UTF-8" || this.encoding === "UTF-16",
      nStartOffset = nCharOffset, nStringLength, nRawLen = this.rawData.length;

    if (nRawLen === 0) {
        return new StringView(this.buffer, this.encoding);
    }

    nStringLength = bVariableLen ? this.makeIndex() : nRawLen;
    nCharStart = nCharOffset ? Math.max((nStringLength + nCharOffset) % nStringLength, 0) : 0;
    nStrLen = Number.isInteger(nCharLength) ? Math.max(nCharLength, 0) + nCharStart > nStringLength ? nStringLength - nCharStart : nCharLength : nStringLength;

    if (nCharStart === 0 && nStrLen === nStringLength) { return this; }

    if (bVariableLen) {
        nStartOffset = this.makeIndex(nCharStart);
        nChrLen = this.makeIndex(nStrLen, nStartOffset) - nStartOffset;
    } else {
        nStartOffset = nCharStart;
        nChrLen = nStrLen - nCharStart;
    }

    if (this.encoding === "UTF-16") {
        nStartOffset <<= 1;
    } else if (this.encoding === "UTF-32") {
        nStartOffset <<= 2;
    }

    return new StringView(this.buffer, this.encoding, nStartOffset, nChrLen);

};

StringView.prototype.forEachChar = function (fCallback, oThat, nChrOffset, nChrLen) {

    var aSource = this.rawData, nRawEnd, nRawIdx;

    if (this.encoding === "UTF-8" || this.encoding === "UTF-16") {

        var fGetInptChrSize, fGetInptChrCode;

        if (this.encoding === "UTF-8") {
            fGetInptChrSize = StringView.getUTF8CharLength;
            fGetInptChrCode = StringView.loadUTF8CharCode;
        } else if (this.encoding === "UTF-16") {
            fGetInptChrSize = StringView.getUTF16CharLength;
            fGetInptChrCode = StringView.loadUTF16CharCode;
        }

        nRawIdx = isFinite(nChrOffset) ? this.makeIndex(nChrOffset) : 0;
        nRawEnd = isFinite(nChrLen) ? this.makeIndex(nChrLen, nRawIdx) : aSource.length;

        for (var nChrCode, nChrIdx = 0; nRawIdx < nRawEnd; nChrIdx++) {
            nChrCode = fGetInptChrCode(aSource, nRawIdx);
            fCallback.call(oThat || null, nChrCode, nChrIdx, nRawIdx, aSource);
            nRawIdx += fGetInptChrSize(nChrCode);
        }

    } else {

        nRawIdx = isFinite(nChrOffset) ? nChrOffset : 0;
        nRawEnd = isFinite(nChrLen) ? nChrLen + nRawIdx : aSource.length;

        for (nRawIdx; nRawIdx < nRawEnd; nRawIdx++) {
            fCallback.call(oThat || null, aSource[nRawIdx], nRawIdx, nRawIdx, aSource);
        }

    }

};

StringView.prototype.valueOf = StringView.prototype.toString = function () {

    if (this.encoding !== "UTF-8" && this.encoding !== "UTF-16") {
        /* ASCII, UTF-32 or BinaryString to DOMString */
        return String.fromCharCode.apply(null, this.rawData);
    }

    var fGetCode, fGetIncr, sView = "";

    if (this.encoding === "UTF-8") {
        fGetIncr = StringView.getUTF8CharLength;
        fGetCode = StringView.loadUTF8CharCode;
    } else if (this.encoding === "UTF-16") {
        fGetIncr = StringView.getUTF16CharLength;
        fGetCode = StringView.loadUTF16CharCode;
    }

    for (var nChr, nLen = this.rawData.length, nIdx = 0; nIdx < nLen; nIdx += fGetIncr(nChr)) {
        nChr = fGetCode(this.rawData, nIdx);
        sView += String.fromCharCode(nChr);
    }

    return sView;

};