parent
be93cdb011
commit
fc02ddd709
@ -0,0 +1,16 @@
|
||||
const table = [];
|
||||
for (let n = 0; n < 256; n++) {
|
||||
let c = n;
|
||||
for (let k = 0; k < 8; k++) {
|
||||
c = c & 1 ? 0xEDB88320 ^ (c >>> 1) : c >>> 1;
|
||||
}
|
||||
table[n] = c;
|
||||
}
|
||||
|
||||
export default bytes => {
|
||||
let sum = -1;
|
||||
for (const byte of bytes) {
|
||||
sum = (sum >>> 8) ^ table[(sum ^ byte) & 0xFF];
|
||||
}
|
||||
return sum ^ -1;
|
||||
};
|
@ -1,49 +1,3 @@
|
||||
// do-not-zip.js
|
||||
// Construct a Buffer or a Blob of a .zip file with no compression, on the server or in the browser
|
||||
|
||||
const crcTable = [];
|
||||
for (let n = 0; n < 256; n++) {
|
||||
let c = n;
|
||||
for (let k = 0; k < 8; k++) {
|
||||
c = c & 1 ? 0xEDB88320 ^ (c >>> 1) : c >>> 1;
|
||||
}
|
||||
crcTable[n] = c;
|
||||
}
|
||||
|
||||
const crc32 = bytes => {
|
||||
let sum = -1;
|
||||
for (const byte of bytes) {
|
||||
sum = (sum >>> 8) ^ crcTable[(sum ^ byte) & 0xFF];
|
||||
}
|
||||
return sum ^ -1;
|
||||
};
|
||||
|
||||
const int = (n, length) => {
|
||||
const out = [];
|
||||
while (length--) {
|
||||
out.push(n & 0xFF);
|
||||
n >>>= 8;
|
||||
}
|
||||
return out;
|
||||
};
|
||||
|
||||
const toBytes = data => typeof data === 'string' ? [...data].map(char => char.charCodeAt(0)) : data;
|
||||
|
||||
export default files => {
|
||||
let fileData = [];
|
||||
const centralDirectory = [];
|
||||
for (const { path, data } of files) {
|
||||
const dataBytes = toBytes(data);
|
||||
const pathBytes = toBytes(path);
|
||||
const commonHeader = [0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, ...int(crc32(dataBytes), 4), ...int(dataBytes.length, 4), ...int(dataBytes.length, 4), ...int(pathBytes.length, 2), 0x00, 0x00];
|
||||
centralDirectory.push(0x50, 0x4B, 0x01, 0x02, 0x14, 0x00, ...commonHeader, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, ...int(fileData.length, 4), ...pathBytes);
|
||||
fileData = [...fileData, 0x50, 0x4B, 0x03, 0x04, ...commonHeader, ...pathBytes, ...dataBytes];
|
||||
}
|
||||
const bytes = [...fileData, ...centralDirectory, 0x50, 0x4B, 0x05, 0x06, 0x00, 0x00, 0x00, 0x00, ...int(files.length, 2), ...int(files.length, 2), ...int(centralDirectory.length, 4), ...int(fileData.length, 4), 0x00, 0x00];
|
||||
if (typeof Blob !== 'undefined' && typeof Uint8Array !== 'undefined') {
|
||||
return new Blob([Uint8Array.from(bytes)], { type: 'application/zip' });
|
||||
}
|
||||
if (typeof Buffer !== 'undefined') {
|
||||
return Buffer.from(bytes);
|
||||
}
|
||||
};
|
||||
export { default as toArray } from './toArray.js';
|
||||
export { default as toBlob } from './toBlob.js';
|
||||
export { default as toBuffer } from './toBuffer.js';
|
||||
|
@ -0,0 +1,25 @@
|
||||
import crc32 from './crc32.js';
|
||||
|
||||
const int = (n, length) => {
|
||||
const out = [];
|
||||
while (length--) {
|
||||
out.push(n & 0xFF);
|
||||
n >>>= 8;
|
||||
}
|
||||
return out;
|
||||
};
|
||||
|
||||
const toBytes = data => typeof data === 'string' ? [...data].map(char => char.charCodeAt(0)) : data;
|
||||
|
||||
export default files => {
|
||||
let fileData = [];
|
||||
const centralDirectory = [];
|
||||
for (const { path, data } of files) {
|
||||
const dataBytes = toBytes(data);
|
||||
const pathBytes = toBytes(path);
|
||||
const commonHeader = [0x0A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, ...int(crc32(dataBytes), 4), ...int(dataBytes.length, 4), ...int(dataBytes.length, 4), ...int(pathBytes.length, 2), 0x00, 0x00];
|
||||
centralDirectory.push(0x50, 0x4B, 0x01, 0x02, 0x14, 0x00, ...commonHeader, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, ...int(fileData.length, 4), ...pathBytes);
|
||||
fileData = [...fileData, 0x50, 0x4B, 0x03, 0x04, ...commonHeader, ...pathBytes, ...dataBytes];
|
||||
}
|
||||
return [...fileData, ...centralDirectory, 0x50, 0x4B, 0x05, 0x06, 0x00, 0x00, 0x00, 0x00, ...int(files.length, 2), ...int(files.length, 2), ...int(centralDirectory.length, 4), ...int(fileData.length, 4), 0x00, 0x00];
|
||||
};
|
@ -0,0 +1,3 @@
|
||||
import toArray from './toArray.js';
|
||||
|
||||
export default files => new Blob([Uint8Array.from(toArray(files))], { type: 'application/zip' });
|
@ -0,0 +1,3 @@
|
||||
import toArray from './toArray.js';
|
||||
|
||||
export default files => Buffer.from(toArray(files));
|
Loading…
Reference in new issue