38 lines
843 B
JavaScript
38 lines
843 B
JavaScript
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/** @fileOverview Bit array codec implementations.
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*
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* @author Emily Stark
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* @author Mike Hamburg
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* @author Dan Boneh
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*/
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/** @namespace Arrays of bytes */
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sjcl.codec.bytes = {
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/** Convert from a bitArray to an array of bytes. */
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fromBits: function (arr) {
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var out = [], bl = sjcl.bitArray.bitLength(arr), i, tmp;
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for (i=0; i<bl/8; i++) {
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if ((i&3) === 0) {
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tmp = arr[i/4];
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}
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out.push(tmp >>> 24);
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tmp <<= 8;
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}
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return out;
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},
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/** Convert from an array of bytes to a bitArray. */
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toBits: function (bytes) {
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var out = [], i, tmp=0;
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for (i=0; i<bytes.length; i++) {
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tmp = tmp << 8 | bytes[i];
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if ((i&3) === 3) {
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out.push(tmp);
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tmp = 0;
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}
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}
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if (i&3) {
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out.push(sjcl.bitArray.partial(8*(i&3), tmp));
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}
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return out;
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}
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};
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