Move additional worker-thread only functions from src/shared/util.js and into a src/core/core_utils.js instead

This moves the `log2`, `readInt8`, `readUint16`, `readUint32`, and `isSpace` functions since they are only used in the worker-thread.

src/core/core_utils.js

@@ -132,6 +132,39 @@ function toRomanNumerals(number, lowerCase = false) {
   return lowerCase ? romanStr.toLowerCase() : romanStr;
 }
 
+// Calculate the base 2 logarithm of the number `x`. This differs from the
+// native function in the sense that it returns the ceiling value and that it
+// returns 0 instead of `Infinity`/`NaN` for `x` values smaller than/equal to 0.
+function log2(x) {
+  if (x <= 0) {
+    return 0;
+  }
+  return Math.ceil(Math.log2(x));
+}
+
+function readInt8(data, offset) {
+  return (data[offset] << 24) >> 24;
+}
+
+function readUint16(data, offset) {
+  return (data[offset] << 8) | data[offset + 1];
+}
+
+function readUint32(data, offset) {
+  return (
+    ((data[offset] << 24) |
+      (data[offset + 1] << 16) |
+      (data[offset + 2] << 8) |
+      data[offset + 3]) >>>
+    0
+  );
+}
+
+// Checks if ch is one of the following characters: SPACE, TAB, CR or LF.
+function isSpace(ch) {
+  return ch === 0x20 || ch === 0x09 || ch === 0x0d || ch === 0x0a;
+}
+
 export {
   getLookupTableFactory,
   MissingDataException,
@@ -139,4 +172,9 @@ export {
   XRefParseException,
   getInheritableProperty,
   toRomanNumerals,
+  log2,
+  readInt8,
+  readUint16,
+  readUint32,
+  isSpace,
 };

src/core/document.js

@@ -23,7 +23,6 @@ import {
   isArrayEqual,
   isBool,
   isNum,
-  isSpace,
   isString,
   OPS,
   shadow,
@@ -36,6 +35,7 @@ import { Catalog, ObjectLoader, XRef } from "./obj.js";
 import { Dict, isDict, isName, isStream, Ref } from "./primitives.js";
 import {
   getInheritableProperty,
+  isSpace,
   MissingDataException,
   XRefEntryException,
   XRefParseException,

src/core/fonts.js

@@ -21,8 +21,6 @@ import {
   FormatError,
   info,
   isNum,
-  isSpace,
-  readUint32,
   shadow,
   string32,
   unreachable,
@@ -60,9 +58,9 @@ import {
   getUnicodeRangeFor,
   mapSpecialUnicodeValues,
 } from "./unicode.js";
+import { isSpace, MissingDataException, readUint32 } from "./core_utils.js";
 import { FontRendererFactory } from "./font_renderer.js";
 import { IdentityCMap } from "./cmap.js";
-import { MissingDataException } from "./core_utils.js";
 import { Stream } from "./stream.js";
 import { Type1Parser } from "./type1_parser.js";
 

src/core/jbig2.js

@@ -13,14 +13,8 @@
  * limitations under the License.
  */
 
-import {
-  BaseException,
-  log2,
-  readInt8,
-  readUint16,
-  readUint32,
-  shadow,
-} from "../shared/util.js";
+import { BaseException, shadow } from "../shared/util.js";
+import { log2, readInt8, readUint16, readUint32 } from "./core_utils.js";
 import { ArithmeticDecoder } from "./arithmetic_decoder.js";
 import { CCITTFaxDecoder } from "./ccitt.js";
 

src/core/jpx.js

@@ -13,14 +13,8 @@
  * limitations under the License.
  */
 
-import {
-  BaseException,
-  info,
-  log2,
-  readUint16,
-  readUint32,
-  warn,
-} from "../shared/util.js";
+import { BaseException, info, warn } from "../shared/util.js";
+import { log2, readUint16, readUint32 } from "./core_utils.js";
 import { ArithmeticDecoder } from "./arithmetic_decoder.js";
 
 class JpxError extends BaseException {

src/core/parser.js

@@ -29,7 +29,6 @@ import {
   FormatError,
   info,
   isNum,
-  isSpace,
   StreamType,
   warn,
 } from "../shared/util.js";
@@ -44,11 +43,11 @@ import {
   Name,
   Ref,
 } from "./primitives.js";
+import { isSpace, MissingDataException } from "./core_utils.js";
 import { CCITTFaxStream } from "./ccitt_stream.js";
 import { Jbig2Stream } from "./jbig2_stream.js";
 import { JpegStream } from "./jpeg_stream.js";
 import { JpxStream } from "./jpx_stream.js";
-import { MissingDataException } from "./core_utils.js";
 
 const MAX_LENGTH_TO_CACHE = 1000;
 const MAX_ADLER32_LENGTH = 5552;

src/core/ps_parser.js

@@ -14,8 +14,9 @@
  */
 /* eslint no-var: error */
 
-import { FormatError, isSpace, shadow } from "../shared/util.js";
+import { FormatError, shadow } from "../shared/util.js";
 import { EOF } from "./primitives.js";
+import { isSpace } from "./core_utils.js";
 
 class PostScriptParser {
   constructor(lexer) {

src/core/stream.js

@@ -19,13 +19,9 @@
  * license.
  */
 
-import {
-  FormatError,
-  isSpace,
-  stringToBytes,
-  unreachable,
-} from "../shared/util.js";
+import { FormatError, stringToBytes, unreachable } from "../shared/util.js";
 import { isDict } from "./primitives.js";
+import { isSpace } from "./core_utils.js";
 
 var Stream = (function StreamClosure() {
   function Stream(arrayBuffer, start, length, dict) {

src/core/type1_parser.js

@@ -13,9 +13,10 @@
  * limitations under the License.
  */
 
-import { isSpace, warn } from "../shared/util.js";
 import { getEncoding } from "./encodings.js";
+import { isSpace } from "./core_utils.js";
 import { Stream } from "./stream.js";
+import { warn } from "../shared/util.js";
 
 // Hinting is currently disabled due to unknown problems on windows
 // in tracemonkey and various other pdfs with type1 fonts.

src/shared/util.js

@@ -547,34 +547,6 @@ function string32(value) {
   );
 }
 
-// Calculate the base 2 logarithm of the number `x`. This differs from the
-// native function in the sense that it returns the ceiling value and that it
-// returns 0 instead of `Infinity`/`NaN` for `x` values smaller than/equal to 0.
-function log2(x) {
-  if (x <= 0) {
-    return 0;
-  }
-  return Math.ceil(Math.log2(x));
-}
-
-function readInt8(data, start) {
-  return (data[start] << 24) >> 24;
-}
-
-function readUint16(data, offset) {
-  return (data[offset] << 8) | data[offset + 1];
-}
-
-function readUint32(data, offset) {
-  return (
-    ((data[offset] << 24) |
-      (data[offset + 1] << 16) |
-      (data[offset + 2] << 8) |
-      data[offset + 3]) >>>
-    0
-  );
-}
-
 // Lazy test the endianness of the platform
 // NOTE: This will be 'true' for simulated TypedArrays
 function isLittleEndian() {
@@ -835,11 +807,6 @@ function isArrayEqual(arr1, arr2) {
   });
 }
 
-// Checks if ch is one of the following characters: SPACE, TAB, CR or LF.
-function isSpace(ch) {
-  return ch === 0x20 || ch === 0x09 || ch === 0x0d || ch === 0x0a;
-}
-
 /**
  * Promise Capability object.
  *
@@ -949,15 +916,10 @@ export {
   isEmptyObj,
   isNum,
   isString,
-  isSpace,
   isSameOrigin,
   createValidAbsoluteUrl,
   isLittleEndian,
   isEvalSupported,
-  log2,
-  readInt8,
-  readUint16,
-  readUint32,
   removeNullCharacters,
   setVerbosityLevel,
   shadow,

test/unit/core_utils_spec.js

@@ -16,6 +16,8 @@
 import { Dict, Ref } from "../../src/core/primitives.js";
 import {
   getInheritableProperty,
+  isSpace,
+  log2,
   toRomanNumerals,
 } from "../../src/core/core_utils.js";
 import { XRefMock } from "./test_utils.js";
@@ -180,4 +182,33 @@ describe("core_utils", function() {
       expect(toRomanNumerals(2019, /* lowercase = */ true)).toEqual("mmxix");
     });
   });
+
+  describe("log2", function() {
+    it("handles values smaller than/equal to zero", function() {
+      expect(log2(0)).toEqual(0);
+      expect(log2(-1)).toEqual(0);
+    });
+
+    it("handles values larger than zero", function() {
+      expect(log2(1)).toEqual(0);
+      expect(log2(2)).toEqual(1);
+      expect(log2(3)).toEqual(2);
+      expect(log2(3.14)).toEqual(2);
+    });
+  });
+
+  describe("isSpace", function() {
+    it("handles space characters", function() {
+      expect(isSpace(0x20)).toEqual(true);
+      expect(isSpace(0x09)).toEqual(true);
+      expect(isSpace(0x0d)).toEqual(true);
+      expect(isSpace(0x0a)).toEqual(true);
+    });
+
+    it("handles non-space characters", function() {
+      expect(isSpace(0x0b)).toEqual(false);
+      expect(isSpace(null)).toEqual(false);
+      expect(isSpace(undefined)).toEqual(false);
+    });
+  });
 });

test/unit/util_spec.js

@@ -22,9 +22,7 @@ import {
   isEmptyObj,
   isNum,
   isSameOrigin,
-  isSpace,
   isString,
-  log2,
   removeNullCharacters,
   string32,
   stringToBytes,
@@ -118,21 +116,6 @@ describe("util", function() {
     });
   });
 
-  describe("isSpace", function() {
-    it("handles space characters", function() {
-      expect(isSpace(0x20)).toEqual(true);
-      expect(isSpace(0x09)).toEqual(true);
-      expect(isSpace(0x0d)).toEqual(true);
-      expect(isSpace(0x0a)).toEqual(true);
-    });
-
-    it("handles non-space characters", function() {
-      expect(isSpace(0x0b)).toEqual(false);
-      expect(isSpace(null)).toEqual(false);
-      expect(isSpace(undefined)).toEqual(false);
-    });
-  });
-
   describe("isString", function() {
     it("handles string values", function() {
       expect(isString("foo")).toEqual(true);
@@ -147,20 +130,6 @@ describe("util", function() {
     });
   });
 
-  describe("log2", function() {
-    it("handles values smaller than/equal to zero", function() {
-      expect(log2(0)).toEqual(0);
-      expect(log2(-1)).toEqual(0);
-    });
-
-    it("handles values larger than zero", function() {
-      expect(log2(1)).toEqual(0);
-      expect(log2(2)).toEqual(1);
-      expect(log2(3)).toEqual(2);
-      expect(log2(3.14)).toEqual(2);
-    });
-  });
-
   describe("string32", function() {
     it("converts unsigned 32-bit integers to strings", function() {
       expect(string32(0x74727565)).toEqual("true");