sheetjs-clone/bits/23_binutils.js
SheetJS 6bc24374b9 version bump 0.7.7: needs more cowbell
- parsexmltag and other hot functions now better optimized for v8
- monomorphic functions (different types -> different funcs)
- more efficient decode_range implementation when source is trusted
- regular expressions cached and simplified without breaking correctness
- more efficient utf8 techniques when available
- XLSX: large functions broken down into sub-functions (e.g. `parse_ws_xml`)
- XLSB: avoid unnecessary binds
- XLSB: assume no exotic codepage exists (no one else tries to write XLSB)
- demo exposes rABS / worker / transferable options
- more tests
- jszip updated to 2.3.0
- SSF updated to 0.8.1
- codepage updated to 1.3.1
2014-06-29 14:29:45 -04:00

89 lines
3.6 KiB
JavaScript

function readIEEE754(buf, idx, isLE, nl, ml) {
if(isLE === undefined) isLE = true;
if(!nl) nl = 8;
if(!ml && nl === 8) ml = 52;
var e, m, el = nl * 8 - ml - 1, eMax = (1 << el) - 1, eBias = eMax >> 1;
var bits = -7, d = isLE ? -1 : 1, i = isLE ? (nl - 1) : 0, s = buf[idx + i];
i += d;
e = s & ((1 << (-bits)) - 1); s >>>= (-bits); bits += el;
for (; bits > 0; e = e * 256 + buf[idx + i], i += d, bits -= 8);
m = e & ((1 << (-bits)) - 1); e >>>= (-bits); bits += ml;
for (; bits > 0; m = m * 256 + buf[idx + i], i += d, bits -= 8);
if (e === eMax) return m ? NaN : ((s ? -1 : 1) * Infinity);
else if (e === 0) e = 1 - eBias;
else { m = m + Math.pow(2, ml); e = e - eBias; }
return (s ? -1 : 1) * m * Math.pow(2, e - ml);
}
var __toBuffer, ___toBuffer;
__toBuffer = ___toBuffer = function(bufs) {
var x = [];
for(var i = 0; i != bufs[0].length; ++i) { x = x.concat(bufs[0][i]); }
return x;
};
if(typeof Buffer !== "undefined") {
__toBuffer = function(bufs) { return (bufs[0].length > 0 && Buffer.isBuffer(bufs[0][0])) ? Buffer.concat(bufs[0]) : ___toBuffer(bufs);};
}
var ___readUInt32LE = function(b, idx) { return b.readUInt32LE ? b.readUInt32LE(idx) : b[idx+3]*(1<<24)+(b[idx+2]<<16)+(b[idx+1]<<8)+b[idx]; };
var ___readInt32LE = function(b, idx) { return (b[idx+3]<<24)+(b[idx+2]<<16)+(b[idx+1]<<8)+b[idx]; };
var __readUInt8 = function(b, idx) { return b.readUInt8 ? b.readUInt8(idx) : b[idx]; };
var __readUInt16LE = function(b, idx) { return b.readUInt16LE ? b.readUInt16LE(idx) : b[idx+1]*(1<<8)+b[idx]; };
var __readInt16LE = function(b, idx) { var u = __readUInt16LE(b,idx); if(!(u & 0x8000)) return u; return (0xffff - u + 1) * -1; };
var __readUInt32LE = typeof Buffer !== "undefined" ? function(b, i) { return Buffer.isBuffer(b) ? b.readUInt32LE(i) : ___readUInt32LE(b,i); } : ___readUInt32LE;
var __readInt32LE = typeof Buffer !== "undefined" ? function(b, i) { return Buffer.isBuffer(b) ? b.readInt32LE(i) : ___readInt32LE(b,i); } : ___readInt32LE;
var __readDoubleLE = function(b, idx) { return b.readDoubleLE ? b.readDoubleLE(idx) : readIEEE754(b, idx||0);};
function ReadShift(size, t) {
var o="", oo=[], w, vv, i, loc;
if(t === 'dbcs') {
loc = this.l;
if(typeof Buffer !== 'undefined' && this instanceof Buffer) o = this.slice(this.l, this.l+2*size).toString("utf16le");
else for(i = 0; i != size; ++i) { o+=String.fromCharCode(__readUInt16LE(this, loc)); loc+=2; }
size *= 2;
} else switch(size) {
case 1: o = __readUInt8(this, this.l); break;
case 2: o = (t === 'i' ? __readInt16LE : __readUInt16LE)(this, this.l); break;
case 4: o = __readUInt32LE(this, this.l); break;
case 8: if(t === 'f') { o = __readDoubleLE(this, this.l); break; }
}
this.l+=size; return o;
}
function WriteShift(t, val, f) {
var size, i;
if(f === 'dbcs') {
for(i = 0; i != val.length; ++i) this.writeUInt16LE(val.charCodeAt(i), this.l + 2 * i);
size = 2 * val.length;
} else switch(t) {
case 1: size = 1; this.writeUInt8(val, this.l); break;
case 4: size = 4; this.writeUInt32LE(val, this.l); break;
case 8: size = 8; if(f === 'f') { this.writeDoubleLE(val, this.l); break; }
/* falls through */
case 16: break;
case -4: size = 4; this.writeInt32LE(val, this.l); break;
}
this.l += size; return this;
}
function prep_blob(blob, pos) {
blob.l = pos || 0;
blob.read_shift = ReadShift;
blob.write_shift = WriteShift;
}
function parsenoop(blob, length) { blob.l += length; }
function writenoop(blob, length) { blob.l += length; }
function new_buf(sz) {
var o = typeof Buffer !== 'undefined' ? new Buffer(sz) : new Array(sz);
prep_blob(o, 0);
return o;
}
function is_buf(a) { return (typeof Buffer !== 'undefined' && a instanceof Buffer) || Array.isArray(a); }