fix: start should less then end for encodeChunk()

Author: waitingsong

src/lib/config.ts

@@ -18,7 +18,8 @@ export const ErrorMsg = {
   fromArrayBufferInvalidParam: 'Invalid input, should be ArrayBuffer or Uint8Array',
   notString: 'Invalid value of parameter, should be string',
   notValidB64String: 'Valid base64 string only contains /^[a-zA-Z0-9+/_-]+={0,2}$/',
-  startMustGrossOrEqualToEnd:  'Parameters of start should less then end',
+  startMustGrossOrEqualToEnd:  'Parameters of start should less then or equal to end',
+  startMustGrossToEnd:  'Parameters of start should less then end',
   textEncoderUndefined: 'TextEncoder undefined!',
   textDecoderUndefined: 'TextDecoder undefined!',
 }

src/lib/from_buffer.ts

@@ -39,8 +39,8 @@ export function fromUint8Array(input: Uint8Array): string {
 
 
 function encodeChunk(input: Uint8Array, start: number, end: number): string {
-  if (start > end) {
-    throw new Error(ErrorMsg.startMustGrossOrEqualToEnd)
+  if (start >= end) {
+    throw new Error(ErrorMsg.startMustGrossToEnd)
   }
   const arrLen = Math.ceil((end - start) / 3)
   const ret: string[] = new Array(arrLen)

test/20_from_buffer.test.ts

@@ -33,14 +33,14 @@ describe(filename, () => {
     const fn = <(input: Uint8Array, start: number, end: number) => string> mods.__get__(fnName)
 
     it('with invalid start/end value', () => {
-      [ [1, 0], [0, -1] ].forEach(([start, end]) => {
+      [ [1, 0], [0, -1], [1, 1], [0, 0] ].forEach(([start, end]) => {
         try {
           fn(inputUint8Array[0], start, end)
           assert(false, 'Should throw error, but NOT')
         }
         catch (ex) {
           assert(
-            ex.message && ex.message.includes(ErrorMsg.startMustGrossOrEqualToEnd),
+            ex.message && ex.message.includes(ErrorMsg.startMustGrossToEnd),
             ex.message,
           )
         }