lix-website/themes/lix/assets/bootstrap/node_modules/buffers/index.js
2024-04-26 22:49:34 -06:00

270 lines
6.9 KiB
JavaScript

module.exports = Buffers;
function Buffers (bufs) {
if (!(this instanceof Buffers)) return new Buffers(bufs);
this.buffers = bufs || [];
this.length = this.buffers.reduce(function (size, buf) {
return size + buf.length
}, 0);
}
Buffers.prototype.push = function () {
for (var i = 0; i < arguments.length; i++) {
if (!Buffer.isBuffer(arguments[i])) {
throw new TypeError('Tried to push a non-buffer');
}
}
for (var i = 0; i < arguments.length; i++) {
var buf = arguments[i];
this.buffers.push(buf);
this.length += buf.length;
}
return this.length;
};
Buffers.prototype.unshift = function () {
for (var i = 0; i < arguments.length; i++) {
if (!Buffer.isBuffer(arguments[i])) {
throw new TypeError('Tried to unshift a non-buffer');
}
}
for (var i = 0; i < arguments.length; i++) {
var buf = arguments[i];
this.buffers.unshift(buf);
this.length += buf.length;
}
return this.length;
};
Buffers.prototype.copy = function (dst, dStart, start, end) {
return this.slice(start, end).copy(dst, dStart, 0, end - start);
};
Buffers.prototype.splice = function (i, howMany) {
var buffers = this.buffers;
var index = i >= 0 ? i : this.length - i;
var reps = [].slice.call(arguments, 2);
if (howMany === undefined) {
howMany = this.length - index;
}
else if (howMany > this.length - index) {
howMany = this.length - index;
}
for (var i = 0; i < reps.length; i++) {
this.length += reps[i].length;
}
var removed = new Buffers();
var bytes = 0;
var startBytes = 0;
for (
var ii = 0;
ii < buffers.length && startBytes + buffers[ii].length < index;
ii ++
) { startBytes += buffers[ii].length }
if (index - startBytes > 0) {
var start = index - startBytes;
if (start + howMany < buffers[ii].length) {
removed.push(buffers[ii].slice(start, start + howMany));
var orig = buffers[ii];
//var buf = new Buffer(orig.length - howMany);
var buf0 = new Buffer(start);
for (var i = 0; i < start; i++) {
buf0[i] = orig[i];
}
var buf1 = new Buffer(orig.length - start - howMany);
for (var i = start + howMany; i < orig.length; i++) {
buf1[ i - howMany - start ] = orig[i]
}
if (reps.length > 0) {
var reps_ = reps.slice();
reps_.unshift(buf0);
reps_.push(buf1);
buffers.splice.apply(buffers, [ ii, 1 ].concat(reps_));
ii += reps_.length;
reps = [];
}
else {
buffers.splice(ii, 1, buf0, buf1);
//buffers[ii] = buf;
ii += 2;
}
}
else {
removed.push(buffers[ii].slice(start));
buffers[ii] = buffers[ii].slice(0, start);
ii ++;
}
}
if (reps.length > 0) {
buffers.splice.apply(buffers, [ ii, 0 ].concat(reps));
ii += reps.length;
}
while (removed.length < howMany) {
var buf = buffers[ii];
var len = buf.length;
var take = Math.min(len, howMany - removed.length);
if (take === len) {
removed.push(buf);
buffers.splice(ii, 1);
}
else {
removed.push(buf.slice(0, take));
buffers[ii] = buffers[ii].slice(take);
}
}
this.length -= removed.length;
return removed;
};
Buffers.prototype.slice = function (i, j) {
var buffers = this.buffers;
if (j === undefined) j = this.length;
if (i === undefined) i = 0;
if (j > this.length) j = this.length;
var startBytes = 0;
for (
var si = 0;
si < buffers.length && startBytes + buffers[si].length <= i;
si ++
) { startBytes += buffers[si].length }
var target = new Buffer(j - i);
var ti = 0;
for (var ii = si; ti < j - i && ii < buffers.length; ii++) {
var len = buffers[ii].length;
var start = ti === 0 ? i - startBytes : 0;
var end = ti + len >= j - i
? Math.min(start + (j - i) - ti, len)
: len
;
buffers[ii].copy(target, ti, start, end);
ti += end - start;
}
return target;
};
Buffers.prototype.pos = function (i) {
if (i < 0 || i >= this.length) throw new Error('oob');
var l = i, bi = 0, bu = null;
for (;;) {
bu = this.buffers[bi];
if (l < bu.length) {
return {buf: bi, offset: l};
} else {
l -= bu.length;
}
bi++;
}
};
Buffers.prototype.get = function get (i) {
var pos = this.pos(i);
return this.buffers[pos.buf].get(pos.offset);
};
Buffers.prototype.set = function set (i, b) {
var pos = this.pos(i);
return this.buffers[pos.buf].set(pos.offset, b);
};
Buffers.prototype.indexOf = function (needle, offset) {
if ("string" === typeof needle) {
needle = new Buffer(needle);
} else if (needle instanceof Buffer) {
// already a buffer
} else {
throw new Error('Invalid type for a search string');
}
if (!needle.length) {
return 0;
}
if (!this.length) {
return -1;
}
var i = 0, j = 0, match = 0, mstart, pos = 0;
// start search from a particular point in the virtual buffer
if (offset) {
var p = this.pos(offset);
i = p.buf;
j = p.offset;
pos = offset;
}
// for each character in virtual buffer
for (;;) {
while (j >= this.buffers[i].length) {
j = 0;
i++;
if (i >= this.buffers.length) {
// search string not found
return -1;
}
}
var char = this.buffers[i][j];
if (char == needle[match]) {
// keep track where match started
if (match == 0) {
mstart = {
i: i,
j: j,
pos: pos
};
}
match++;
if (match == needle.length) {
// full match
return mstart.pos;
}
} else if (match != 0) {
// a partial match ended, go back to match starting position
// this will continue the search at the next character
i = mstart.i;
j = mstart.j;
pos = mstart.pos;
match = 0;
}
j++;
pos++;
}
};
Buffers.prototype.toBuffer = function() {
return this.slice();
}
Buffers.prototype.toString = function(encoding, start, end) {
return this.slice(start, end).toString(encoding);
}