xsheetjs/bits/87_read.js
SheetJS a846f7184d utility improvements
- sheet_to_csv strip option (fixes #182 h/t @davidworkman9)
- sheet_to_json dateNF option (fixes #134 h/t @rotemtam)
- file type detection expanded to 4 byte magic number
2017-03-22 03:50:11 -04:00

47 lines
1.9 KiB
JavaScript

function firstbyte(f/*:RawData*/,o/*:?TypeOpts*/)/*:Array<number>*/ {
var x = "";
switch((o||{}).type || "base64") {
case 'buffer': return [f[0], f[1], f[2], f[3]];
case 'base64': x = Base64.decode(f.substr(0,24)); break;
case 'binary': x = f; break;
case 'array': return [f[0], f[1], f[2], f[3]];
default: throw new Error("Unrecognized type " + (o ? o.type : "undefined"));
}
return [x.charCodeAt(0), x.charCodeAt(1), x.charCodeAt(2), x.charCodeAt(3)];
}
function read_zip(data/*:RawData*/, opts/*:?ParseOpts*/)/*:Workbook*/ {
/*:: if(!jszip) throw new Error("JSZip is not available"); */
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;
default: throw new Error("Unrecognized type " + o.type);
}
return parse_zip(zip, o);
}
function readSync(data/*:RawData*/, opts/*:?ParseOpts*/)/*:Workbook*/ {
var zip, d = data, n=[0];
var o = opts||{};
if(!o.type) o.type = (has_buf && Buffer.isBuffer(data)) ? "buffer" : "base64";
if(o.type == "file") { o.type = "buffer"; d = _fs.readFileSync(data); }
switch((n = firstbyte(d, o))[0]) {
case 0xD0: return parse_xlscfb(CFB.read(d, o), o);
case 0x09: return parse_xlscfb(s2a(o.type === 'base64' ? Base64.decode(d) : d), o);
case 0x3C: return parse_xlml(d, o);
case 0x50: if(n[1] == 0x4B && n[2] < 0x20 && n[3] < 0x20) return read_zip(d, o); break;
case 0xEF: return parse_xlml(d, o);
default: throw new Error("Unsupported file " + n.join("|"));
}
throw new Error("Unsupported file format " + n.join("|"));
}
function readFileSync(filename/*:string*/, opts/*:?ParseOpts*/)/*:Workbook*/ {
var o = opts||{}; o.type = 'file';
return readSync(filename, o);
}