xsheetjs/bits/87_read.js

47 lines
1.5 KiB
JavaScript

function firstbyte(f,o) {
switch((o||{}).type || "base64") {
case 'buffer': return f[0];
case 'base64': return Base64.decode(f.substr(0,12)).charCodeAt(0);
case 'binary': return f.charCodeAt(0);
case 'array': return f[0];
default: throw new Error("Unrecognized type " + o.type);
}
}
function read_zip(data, opts) {
var zip, d = data;
var o = opts||{};
if(!o.type) o.type = (has_buf && Buffer.isBuffer(data)) ? "buffer" : "base64";
switch(o.type) {
case "base64": zip = new jszip(d, { base64:true }); break;
case "binary": case "array": zip = new jszip(d, { base64:false }); break;
case "buffer": zip = new jszip(d); break;
case "file": zip=new jszip(d=_fs.readFileSync(data)); break;
default: throw new Error("Unrecognized type " + o.type);
}
return parse_zip(zip, o);
}
function readSync(data, opts) {
var zip, d = data, isfile = false, n;
var o = opts||{};
if(!o.type) o.type = (has_buf && Buffer.isBuffer(data)) ? "buffer" : "base64";
if(o.type == "file") { isfile = true; o.type = "buffer"; d = _fs.readFileSync(data); }
switch((n = firstbyte(d, o))) {
case 0xD0:
if(isfile) o.type = "file";
return parse_xlscfb(CFB.read(data, o), o);
case 0x09: return parse_xlscfb(s2a(o.type === 'base64' ? Base64.decode(data) : data), o);
case 0x3C: return parse_xlml(d, o);
case 0x50:
if(isfile) o.type = "file";
return read_zip(data, opts);
default: throw new Error("Unsupported file " + n);
}
}
function readFileSync(data, opts) {
var o = opts||{}; o.type = 'file';
return readSync(data, o);
}