@bokeh/bokehjs
Version:
Interactive, novel data visualization
98 lines • 2.74 kB
JavaScript
import { gunzipSync, gzipSync } from "fflate";
export const b64encode = (() => {
if (typeof Uint8Array.prototype.toBase64 !== "undefined") {
return (data) => data.toBase64();
}
else {
return (data) => {
const chars = Array.from(data).map((b) => String.fromCharCode(b));
return btoa(chars.join(""));
};
}
})();
export const b64decode = (() => {
if (typeof Uint8Array.fromBase64 !== "undefined") {
return (data) => Uint8Array.fromBase64(data);
}
else {
return (data) => {
const binary_string = atob(data);
const len = binary_string.length;
const bytes = new Uint8Array(len);
for (let i = 0, end = len; i < end; i++) {
bytes[i] = binary_string.charCodeAt(i);
}
return bytes;
};
}
})();
export function buffer_to_base64(buffer) {
const bytes = new Uint8Array(buffer);
// we do not want the result to be different depending on mtime, since that is
// irrelevant and also makes things harder to test, so set mtime=0 here
const compressed = gzipSync(bytes, { mtime: 0 });
return b64encode(compressed);
}
export function base64_to_buffer(base64) {
const bytes = b64decode(base64);
return gunzipSync(bytes).buffer;
}
// NOTE: swap{16,32,64} assume byteOffset == 0
function swap16(buffer) {
const x = new Uint8Array(buffer);
for (let i = 0, end = x.length; i < end; i += 2) {
const t = x[i];
x[i] = x[i + 1];
x[i + 1] = t;
}
}
function swap32(buffer) {
const x = new Uint8Array(buffer);
for (let i = 0, end = x.length; i < end; i += 4) {
let t = x[i];
x[i] = x[i + 3];
x[i + 3] = t;
t = x[i + 1];
x[i + 1] = x[i + 2];
x[i + 2] = t;
}
}
function swap64(buffer) {
const x = new Uint8Array(buffer);
for (let i = 0, end = x.length; i < end; i += 8) {
let t = x[i];
x[i] = x[i + 7];
x[i + 7] = t;
t = x[i + 1];
x[i + 1] = x[i + 6];
x[i + 6] = t;
t = x[i + 2];
x[i + 2] = x[i + 5];
x[i + 5] = t;
t = x[i + 3];
x[i + 3] = x[i + 4];
x[i + 4] = t;
}
}
export function swap(buffer, dtype) {
switch (dtype) {
case "uint16":
case "int16":
swap16(buffer);
break;
case "uint32":
case "int32":
case "float32":
swap32(buffer);
break;
case "float64":
swap64(buffer);
break;
case "object":
case "uint8":
case "int8":
case "bool":
break;
}
}
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