8203328: Rename EFS in java.util.zip internals to something meaningful

Reviewed-by: sherman

src/java.base/share/classes/java/util/zip/DeflaterOutputStream.java

@@ -54,7 +54,6 @@ class DeflaterOutputStream extends FilterOutputStream {
     /**
      * Indicates that the stream has been closed.
      */
-
     private boolean closed = false;
 
     private final boolean syncFlush;
@@ -62,7 +61,7 @@ class DeflaterOutputStream extends FilterOutputStream {
     /**
      * Creates a new output stream with the specified compressor,
      * buffer size and flush mode.
-
+     *
      * @param out the output stream
      * @param def the compressor ("deflater")
      * @param size the output buffer size

src/java.base/share/classes/java/util/zip/ZipConstants64.java

@@ -74,11 +74,12 @@ class ZipConstants64 {
     static final int  ZIP64_EXTLEN = 16;      // uncompressed size, 8-byte
 
     /*
-     * Language encoding flag EFS
+     * Language encoding flag (general purpose flag bit 11)
+     *
+     * If this bit is set the filename and comment fields for this
+     * entry must be encoded using UTF-8.
      */
-    static final int EFS = 0x800;       // If this bit is set the filename and
+    static final int USE_UTF8 = 0x800;
-                                        // comment fields for this file must be
-                                        // encoded using UTF-8.
 
     /*
      * Constants below are defined here (instead of in ZipConstants)

src/java.base/share/classes/java/util/zip/ZipEntry.java

@@ -354,7 +354,6 @@ class ZipEntry implements ZipConstants, Cloneable {
      * or ZIP file formatted stream.
      *
      * @return The last access time of the entry, null if not specified
-
      * @see #setLastAccessTime(FileTime)
      * @since 1.8
      */

src/java.base/share/classes/java/util/zip/ZipFile.java

@@ -377,7 +377,7 @@ class ZipFile implements ZipConstants, Closeable {
             ensureOpen();
             if (Objects.equals(lastEntryName, entry.name)) {
                 pos = lastEntryPos;
-            } else if (!zc.isUTF8() && (entry.flag & EFS) != 0) {
+            } else if (!zc.isUTF8() && (entry.flag & USE_UTF8) != 0) {
                 pos = zsrc.getEntryPos(zc.getBytesUTF8(entry.name), false);
             } else {
                 pos = zsrc.getEntryPos(zc.getBytes(entry.name), false);
@@ -605,7 +605,7 @@ class ZipFile implements ZipConstants, Closeable {
     private String getEntryName(int pos) {
         byte[] cen = res.zsrc.cen;
         int nlen = CENNAM(cen, pos);
-        if (!zc.isUTF8() && (CENFLG(cen, pos) & EFS) != 0) {
+        if (!zc.isUTF8() && (CENFLG(cen, pos) & USE_UTF8) != 0) {
             return zc.toStringUTF8(cen, pos + CENHDR, nlen);
         } else {
             return zc.toString(cen, pos + CENHDR, nlen);
@@ -665,7 +665,7 @@ class ZipFile implements ZipConstants, Closeable {
             // (1) null, invoked from iterator, or
             // (2) not equal to the name stored, a slash is appended during
             // getEntryPos() search.
-            if (!zc.isUTF8() && (flag & EFS) != 0) {
+            if (!zc.isUTF8() && (flag & USE_UTF8) != 0) {
                 name = zc.toStringUTF8(cen, pos + CENHDR, nlen);
             } else {
                 name = zc.toString(cen, pos + CENHDR, nlen);
@@ -684,7 +684,7 @@ class ZipFile implements ZipConstants, Closeable {
         }
         if (clen != 0) {
             int start = pos + CENHDR + nlen + elen;
-            if (!zc.isUTF8() && (flag & EFS) != 0) {
+            if (!zc.isUTF8() && (flag & USE_UTF8) != 0) {
                 e.comment = zc.toStringUTF8(cen, start, clen);
             } else {
                 e.comment = zc.toString(cen, start, clen);
@@ -984,7 +984,8 @@ class ZipFile implements ZipConstants, Closeable {
             }
         }
 
-       /* The Zip file spec explicitly allows the LOC extra data size to
+        /*
+         * The Zip file spec explicitly allows the LOC extra data size to
          * be different from the CEN extra data size. Since we cannot trust
          * the CEN extra data size, we need to read the LOC to determine
          * the entry data offset.

src/java.base/share/classes/java/util/zip/ZipInputStream.java

@@ -283,7 +283,7 @@ class ZipInputStream extends InflaterInputStream implements ZipConstants {
         if (get32(tmpbuf, 0) != LOCSIG) {
             return null;
         }
-        // get flag first, we need check EFS.
+        // get flag first, we need check USE_UTF8.
         flag = get16(tmpbuf, LOCFLG);
         // get the entry name and create the ZipEntry first
         int len = get16(tmpbuf, LOCNAM);
@@ -295,8 +295,8 @@ class ZipInputStream extends InflaterInputStream implements ZipConstants {
             b = new byte[blen];
         }
         readFully(b, 0, len);
-        // Force to use UTF-8 if the EFS bit is ON, even the cs is NOT UTF-8
+        // Force to use UTF-8 if the USE_UTF8 bit is ON
-        ZipEntry e = createZipEntry(((flag & EFS) != 0)
+        ZipEntry e = createZipEntry(((flag & USE_UTF8) != 0)
                                     ? zc.toStringUTF8(b, len)
                                     : zc.toString(b, len));
         // now get the remaining fields for the entry

src/java.base/share/classes/java/util/zip/ZipOutputStream.java

@@ -97,6 +97,7 @@ class ZipOutputStream extends DeflaterOutputStream implements ZipConstants {
             throw new IOException("Stream closed");
         }
     }
+
     /**
      * Compression method for uncompressed (STORED) entries.
      */
@@ -232,7 +233,7 @@ class ZipOutputStream extends DeflaterOutputStream implements ZipConstants {
             throw new ZipException("duplicate entry: " + e.name);
         }
         if (zc.isUTF8())
-            e.flag |= EFS;
+            e.flag |= USE_UTF8;
         current = new XEntry(e, written);
         xentries.add(current);
         writeLOC(current);

src/java.base/share/classes/java/util/zip/ZipUtils.java

@@ -88,7 +88,6 @@ class ZipUtils {
     }
 
     /**
-     /*
      * Converts DOS time to Java time (number of milliseconds since epoch).
      */
     public static long dosToJavaTime(long dtime) {

src/java.base/share/classes/java/util/zip/package-info.java

@@ -46,7 +46,7 @@
  *     <li><a id="lang_encoding">APPENDIX D of</a>
  *         <a href="http://www.pkware.com/documents/casestudies/APPNOTE.TXT">
  *         PKWARE ZIP File Format Specification</a> - Language Encoding Flag
- *         (EFS) to encode ZIP entry filename and comment fields using UTF-8.
+ *         to encode ZIP entry filename and comment fields using UTF-8.
  *     <li><a href="http://www.ietf.org/rfc/rfc1950.txt">
  *         ZLIB Compressed Data Format Specification version 3.3</a>
  *         &nbsp;

src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipConstants.java

@@ -43,11 +43,11 @@ class ZipConstants {
     static final int METHOD_AES        = 99;
 
     /*
-     * General purpose big flag
+     * General purpose bit flag
      */
     static final int FLAG_ENCRYPTED  = 0x01;
     static final int FLAG_DATADESCR  = 0x08;    // crc, size and csize in dd
-    static final int FLAG_EFS        = 0x800;   // If this bit is set the filename and
+    static final int FLAG_USE_UTF8   = 0x800;   // If this bit is set the filename and
                                                 // comment fields for this file must be
                                                 // encoded using UTF-8.
     /*

src/jdk.zipfs/share/classes/jdk/nio/zipfs/ZipFileSystem.java

@@ -1374,7 +1374,7 @@ class ZipFileSystem extends FileSystem {
         // store size, compressed size, and crc-32 in LOC header
         e.flag = 0;
         if (zc.isUTF8())
-            e.flag |= FLAG_EFS;
+            e.flag |= FLAG_USE_UTF8;
         OutputStream os;
         if (useTempFile) {
             e.file = getTempPathForEntry(null);

test/jdk/java/util/zip/ZipCoding.java

@@ -114,7 +114,7 @@ public class ZipCoding {
         testZipInputStream(bis, cs, name, comment, bb);
 
         if ("utf-8".equals(csn)) {
-            // EFS should be set
+            // USE_UTF8 should be set
             bis.reset();
             testZipInputStream(bis, Charset.forName("MS932"), name, comment, bb);
         }