sheetjs/bits/21_ziputils.js
reviewher 46360a180a CFB zip compression option
fixes #600 and fixes #1638
2022-02-12 15:26:50 -08:00

106 lines
3.6 KiB
JavaScript

function getdatastr(data)/*:?string*/ {
if(!data) return null;
if(data.content && data.type) return cc2str(data.content, true);
if(data.data) return debom(data.data);
if(data.asNodeBuffer && has_buf) return debom(data.asNodeBuffer().toString('binary'));
if(data.asBinary) return debom(data.asBinary());
if(data._data && data._data.getContent) return debom(cc2str(Array.prototype.slice.call(data._data.getContent(),0)));
return null;
}
function getdatabin(data) {
if(!data) return null;
if(data.data) return char_codes(data.data);
if(data.asNodeBuffer && has_buf) return data.asNodeBuffer();
if(data._data && data._data.getContent) {
var o = data._data.getContent();
if(typeof o == "string") return char_codes(o);
return Array.prototype.slice.call(o);
}
if(data.content && data.type) return data.content;
return null;
}
function getdata(data) { return (data && data.name.slice(-4) === ".bin") ? getdatabin(data) : getdatastr(data); }
/* Part 2 Section 10.1.2 "Mapping Content Types" Names are case-insensitive */
/* OASIS does not comment on filename case sensitivity */
function safegetzipfile(zip, file/*:string*/) {
var k = zip.FullPaths || keys(zip.files);
var f = file.toLowerCase().replace(/[\/]/g, '\\'), g = f.replace(/\\/g,'\/');
for(var i=0; i<k.length; ++i) {
var n = k[i].replace(/^Root Entry[\/]/,"").toLowerCase();
if(f == n || g == n) return zip.files ? zip.files[k[i]] : zip.FileIndex[i];
}
return null;
}
function getzipfile(zip, file/*:string*/) {
var o = safegetzipfile(zip, file);
if(o == null) throw new Error("Cannot find file " + file + " in zip");
return o;
}
function getzipdata(zip, file/*:string*/, safe/*:?boolean*/)/*:any*/ {
if(!safe) return getdata(getzipfile(zip, file));
if(!file) return null;
try { return getzipdata(zip, file); } catch(e) { return null; }
}
function getzipstr(zip, file/*:string*/, safe/*:?boolean*/)/*:?string*/ {
if(!safe) return getdatastr(getzipfile(zip, file));
if(!file) return null;
try { return getzipstr(zip, file); } catch(e) { return null; }
}
function getzipbin(zip, file/*:string*/, safe/*:?boolean*/)/*:any*/ {
if(!safe) return getdatabin(getzipfile(zip, file));
if(!file) return null;
try { return getzipbin(zip, file); } catch(e) { return null; }
}
function zipentries(zip) {
var k = zip.FullPaths || keys(zip.files), o = [];
for(var i = 0; i < k.length; ++i) if(k[i].slice(-1) != '/') o.push(k[i].replace(/^Root Entry[\/]/, ""));
return o.sort();
}
function zip_add_file(zip, path, content) {
if(zip.FullPaths) {
if(typeof content == "string") {
var res;
if(has_buf) res = Buffer_from(content);
/* TODO: investigate performance in Edge 13 */
//else if(typeof TextEncoder !== "undefined") res = new TextEncoder().encode(content);
else res = utf8decode(content);
return CFB.utils.cfb_add(zip, path, res);
}
CFB.utils.cfb_add(zip, path, content);
}
else zip.file(path, content);
}
function zip_new() { return CFB.utils.cfb_new(); }
function zip_read(d, o) {
switch(o.type) {
case "base64": return CFB.read(d, { type: "base64" });
case "binary": return CFB.read(d, { type: "binary" });
case "buffer": case "array": return CFB.read(d, { type: "buffer" });
}
throw new Error("Unrecognized type " + o.type);
}
function resolve_path(path/*:string*/, base/*:string*/)/*:string*/ {
if(path.charAt(0) == "/") return path.slice(1);
var result = base.split('/');
if(base.slice(-1) != "/") result.pop(); // folder path
var target = path.split('/');
while (target.length !== 0) {
var step = target.shift();
if (step === '..') result.pop();
else if (step !== '.') result.push(step);
}
return result.join('/');
}