Add CRC-8 method in Util

PiperOrigin-RevId: 279727618

library/core/src/main/java/com/google/android/exoplayer2/extractor/ts/SectionReader.java

@@ -114,7 +114,7 @@ public final class SectionReader implements TsPayloadReader {
         if (bytesRead == totalSectionLength) {
         if (bytesRead == totalSectionLength) {
           if (sectionSyntaxIndicator) {
           if (sectionSyntaxIndicator) {
             // This section has common syntax as defined in ISO/IEC 13818-1, section 2.4.4.11.
             // This section has common syntax as defined in ISO/IEC 13818-1, section 2.4.4.11.
-            if (Util.crc(sectionData.data, 0, totalSectionLength, 0xFFFFFFFF) != 0) {
+            if (Util.crc32(sectionData.data, 0, totalSectionLength, 0xFFFFFFFF) != 0) {
               // The CRC is invalid so discard the section.
               // The CRC is invalid so discard the section.
               waitingForPayloadStart = true;
               waitingForPayloadStart = true;
               return;
               return;

library/core/src/test/java/com/google/android/exoplayer2/util/UtilTest.java

@@ -267,6 +267,30 @@ public class UtilTest {
   }
   }
 
 
   @Test
   @Test
+  public void testCrc32() {
+    byte[] bytes = {0x5F, 0x78, 0x04, 0x7B, 0x5F};
+    int start = 1;
+    int end = 4;
+    int initialValue = 0xFFFFFFFF;
+
+    int result = Util.crc32(bytes, start, end, initialValue);
+
+    assertThat(result).isEqualTo(0x67ce9747);
+  }
+
+  @Test
+  public void testCrc8() {
+    byte[] bytes = {0x5F, 0x78, 0x04, 0x7B, 0x5F};
+    int start = 1;
+    int end = 4;
+    int initialValue = 0;
+
+    int result = Util.crc8(bytes, start, end, initialValue);
+
+    assertThat(result).isEqualTo(0x4);
+  }
+
+  @Test
   public void testInflate() {
   public void testInflate() {
     byte[] testData = TestUtil.buildTestData(/*arbitrary test data size*/ 256 * 1024);
     byte[] testData = TestUtil.buildTestData(/*arbitrary test data size*/ 256 * 1024);
     byte[] compressedData = new byte[testData.length * 2];
     byte[] compressedData = new byte[testData.length * 2];