aboutsummaryrefslogtreecommitdiff
path: root/sandbox/testAppNevena/Front/node_modules/tar/lib/large-numbers.js
diff options
context:
space:
mode:
authorNevena Bojovic <nenabojov@gmail.com>2022-03-01 22:05:25 +0100
committerNevena Bojovic <nenabojov@gmail.com>2022-03-01 22:05:25 +0100
commit6555fb80fdd8f6a5d201efadec3189d1244830a0 (patch)
treec1aa1c5aedc634ad1ea7fad4847884d559b51290 /sandbox/testAppNevena/Front/node_modules/tar/lib/large-numbers.js
parent7d3640f824f46490b47bd95f1c5a16644f712068 (diff)
Izbrisala bin, obj i node-modules.
Diffstat (limited to 'sandbox/testAppNevena/Front/node_modules/tar/lib/large-numbers.js')
-rw-r--r--sandbox/testAppNevena/Front/node_modules/tar/lib/large-numbers.js99
1 files changed, 0 insertions, 99 deletions
diff --git a/sandbox/testAppNevena/Front/node_modules/tar/lib/large-numbers.js b/sandbox/testAppNevena/Front/node_modules/tar/lib/large-numbers.js
deleted file mode 100644
index dd6f690b..00000000
--- a/sandbox/testAppNevena/Front/node_modules/tar/lib/large-numbers.js
+++ /dev/null
@@ -1,99 +0,0 @@
-'use strict'
-// Tar can encode large and negative numbers using a leading byte of
-// 0xff for negative, and 0x80 for positive.
-
-const encode = (num, buf) => {
- if (!Number.isSafeInteger(num))
- // The number is so large that javascript cannot represent it with integer
- // precision.
- throw Error('cannot encode number outside of javascript safe integer range')
- else if (num < 0)
- encodeNegative(num, buf)
- else
- encodePositive(num, buf)
- return buf
-}
-
-const encodePositive = (num, buf) => {
- buf[0] = 0x80
-
- for (var i = buf.length; i > 1; i--) {
- buf[i - 1] = num & 0xff
- num = Math.floor(num / 0x100)
- }
-}
-
-const encodeNegative = (num, buf) => {
- buf[0] = 0xff
- var flipped = false
- num = num * -1
- for (var i = buf.length; i > 1; i--) {
- var byte = num & 0xff
- num = Math.floor(num / 0x100)
- if (flipped)
- buf[i - 1] = onesComp(byte)
- else if (byte === 0)
- buf[i - 1] = 0
- else {
- flipped = true
- buf[i - 1] = twosComp(byte)
- }
- }
-}
-
-const parse = (buf) => {
- const pre = buf[0]
- const value = pre === 0x80 ? pos(buf.slice(1, buf.length))
- : pre === 0xff ? twos(buf)
- : null
- if (value === null)
- throw Error('invalid base256 encoding')
-
- if (!Number.isSafeInteger(value))
- // The number is so large that javascript cannot represent it with integer
- // precision.
- throw Error('parsed number outside of javascript safe integer range')
-
- return value
-}
-
-const twos = (buf) => {
- var len = buf.length
- var sum = 0
- var flipped = false
- for (var i = len - 1; i > -1; i--) {
- var byte = buf[i]
- var f
- if (flipped)
- f = onesComp(byte)
- else if (byte === 0)
- f = byte
- else {
- flipped = true
- f = twosComp(byte)
- }
- if (f !== 0)
- sum -= f * Math.pow(256, len - i - 1)
- }
- return sum
-}
-
-const pos = (buf) => {
- var len = buf.length
- var sum = 0
- for (var i = len - 1; i > -1; i--) {
- var byte = buf[i]
- if (byte !== 0)
- sum += byte * Math.pow(256, len - i - 1)
- }
- return sum
-}
-
-const onesComp = byte => (0xff ^ byte) & 0xff
-
-const twosComp = byte => ((0xff ^ byte) + 1) & 0xff
-
-module.exports = {
- encode,
- parse,
-}