import { int2char } from "./util";
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var b64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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var b64pad = "=";
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export function hex2b64(h) {
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var i;
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var c;
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var ret = "";
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for (i = 0; i + 3 <= h.length; i += 3) {
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c = parseInt(h.substring(i, i + 3), 16);
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ret += b64map.charAt(c >> 6) + b64map.charAt(c & 63);
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}
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if (i + 1 == h.length) {
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c = parseInt(h.substring(i, i + 1), 16);
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ret += b64map.charAt(c << 2);
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}
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else if (i + 2 == h.length) {
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c = parseInt(h.substring(i, i + 2), 16);
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ret += b64map.charAt(c >> 2) + b64map.charAt((c & 3) << 4);
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}
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while ((ret.length & 3) > 0) {
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ret += b64pad;
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}
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return ret;
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}
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// convert a base64 string to hex
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export function b64tohex(s) {
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var ret = "";
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var i;
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var k = 0; // b64 state, 0-3
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var slop = 0;
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for (i = 0; i < s.length; ++i) {
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if (s.charAt(i) == b64pad) {
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break;
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}
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var v = b64map.indexOf(s.charAt(i));
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if (v < 0) {
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continue;
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}
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if (k == 0) {
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ret += int2char(v >> 2);
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slop = v & 3;
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k = 1;
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}
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else if (k == 1) {
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ret += int2char((slop << 2) | (v >> 4));
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slop = v & 0xf;
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k = 2;
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}
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else if (k == 2) {
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ret += int2char(slop);
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ret += int2char(v >> 2);
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slop = v & 3;
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k = 3;
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}
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else {
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ret += int2char((slop << 2) | (v >> 4));
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ret += int2char(v & 0xf);
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k = 0;
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}
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}
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if (k == 1) {
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ret += int2char(slop << 2);
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}
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return ret;
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}
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// convert a base64 string to a byte/number array
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export function b64toBA(s) {
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// piggyback on b64tohex for now, optimize later
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var h = b64tohex(s);
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var i;
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var a = [];
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for (i = 0; 2 * i < h.length; ++i) {
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a[i] = parseInt(h.substring(2 * i, 2 * i + 2), 16);
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}
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return a;
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}
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