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8233234: Better Zip Naming

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Reviewed-by: alanb, ahgross, redestad, coffeys, mschoene, rhalade
This commit is contained in:
Lance Andersen 2020-01-31 13:52:04 -05:00
parent a5a46ff8e5
commit 8a616df8b5
4 changed files with 87 additions and 7 deletions
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47
src/java.base/share/classes/java/util/zip/ZipFile.java
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@ -790,7 +790,6 @@ public class ZipFile implements ZipConstants, Closeable {
throw new UncheckedIOException(ioe);
}
}
}
/**
@ -1296,6 +1295,44 @@ public class ZipFile implements ZipConstants, Closeable {
}
}
private static final void checkUTF8(byte[] a, int pos, int len) throws ZipException {
try {
int end = pos + len;
while (pos < end) {
// ASCII fast-path: When checking that a range of bytes is
// valid UTF-8, we can avoid some allocation by skipping
// past bytes in the 0-127 range
if (a[pos] < 0) {
ZipCoder.toStringUTF8(a, pos, end - pos);
break;
}
pos++;
}
} catch(Exception e) {
zerror("invalid CEN header (bad entry name)");
}
}
private final void checkEncoding(ZipCoder zc, byte[] a, int pos, int nlen) throws ZipException {
try {
zc.toString(a, pos, nlen);
} catch(Exception e) {
zerror("invalid CEN header (bad entry name)");
}
}
private static final int hashN(byte[] a, int off, int len) {
int h = 1;
while (len-- > 0) {
h = 31 * h + a[off++];
}
return h;
}
private static final int hash_append(int hash, byte b) {
return hash * 31 + b;
}
private static class End {
int centot; // 4 bytes
long cenlen; // 4 bytes
@ -1474,12 +1511,18 @@ public class ZipFile implements ZipConstants, Closeable {
int nlen = CENNAM(cen, pos);
int elen = CENEXT(cen, pos);
int clen = CENCOM(cen, pos);
if ((CENFLG(cen, pos) & 1) != 0)
int flag = CENFLG(cen, pos);
if ((flag & 1) != 0)
zerror("invalid CEN header (encrypted entry)");
if (method != STORED && method != DEFLATED)
zerror("invalid CEN header (bad compression method: " + method + ")");
if (entryPos + nlen > limit)
zerror("invalid CEN header (bad header size)");
if (zc.isUTF8() || (flag & USE_UTF8) != 0) {
checkUTF8(cen, pos + CENHDR, nlen);
} else {
checkEncoding(zc, cen, pos + CENHDR, nlen);
}
// Record the CEN offset and the name hash in our hash cell.
hash = zipCoderForPos(pos).normalizedHash(cen, entryPos, nlen);
hsh = (hash & 0x7fffffff) % tablelen;