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authorPetr Mrázek <peterix@gmail.com>2016-04-10 15:53:05 +0200
committerPetr Mrázek <peterix@gmail.com>2016-05-01 00:00:14 +0200
commitb6d455a02bd338e9dc0faa09d4d8177ecd8d569a (patch)
tree41982bca1ede50049f2f8c7109dd18edeefde6d0 /libraries/pack200/src/unpack200.cpp
parent47e37635f50c09b4f9a9ee7699e3120bab3e4088 (diff)
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NOISSUE reorganize and document libraries
Diffstat (limited to 'libraries/pack200/src/unpack200.cpp')
-rw-r--r--libraries/pack200/src/unpack200.cpp162
1 files changed, 162 insertions, 0 deletions
diff --git a/libraries/pack200/src/unpack200.cpp b/libraries/pack200/src/unpack200.cpp
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+/*
+ * Copyright (c) 2003, 2008, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+#include <sys/types.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <assert.h>
+#include <limits.h>
+#include <time.h>
+#include <stdint.h>
+
+#include "constants.h"
+#include "utils.h"
+#include "defines.h"
+#include "bytes.h"
+#include "coding.h"
+#include "unpack200.h"
+#include "unpack.h"
+#include "zip.h"
+
+// Callback for fetching data, Unix style.
+static int64_t read_input_via_stdio(unpacker *u, void *buf, int64_t minlen, int64_t maxlen)
+{
+ assert(u->infileptr != nullptr);
+ assert(minlen <= maxlen); // don't talk nonsense
+ int64_t numread = 0;
+ char *bufptr = (char *)buf;
+ while (numread < minlen)
+ {
+ // read available input, up to buf.length or maxlen
+ int readlen = (1 << 16);
+ if (readlen > (maxlen - numread))
+ readlen = (int)(maxlen - numread);
+ int nr = 0;
+
+ nr = (int)fread(bufptr, 1, readlen, u->infileptr);
+ if (nr <= 0)
+ {
+ if (errno != EINTR)
+ break;
+ nr = 0;
+ }
+ numread += nr;
+ bufptr += nr;
+ assert(numread <= maxlen);
+ }
+ return numread;
+}
+
+enum
+{
+ EOF_MAGIC = 0,
+ BAD_MAGIC = -1
+};
+
+static int read_magic(unpacker *u, char peek[], int peeklen)
+{
+ assert(peeklen == 4); // magic numbers are always 4 bytes
+ int64_t nr = (u->read_input_fn)(u, peek, peeklen, peeklen);
+ if (nr != peeklen)
+ {
+ return (nr == 0) ? EOF_MAGIC : BAD_MAGIC;
+ }
+ int magic = 0;
+ for (int i = 0; i < peeklen; i++)
+ {
+ magic <<= 8;
+ magic += peek[i] & 0xFF;
+ }
+ return magic;
+}
+
+void unpack_200(FILE *input, FILE *output)
+{
+ unpacker u;
+ u.init(read_input_via_stdio);
+
+ // initialize jar output
+ // the output takes ownership of the file handle
+ jar jarout;
+ jarout.init(&u);
+ jarout.jarfp = output;
+
+ // the input doesn't
+ u.infileptr = input;
+
+ // read the magic!
+ char peek[4];
+ int magic;
+ magic = read_magic(&u, peek, (int)sizeof(peek));
+
+ // if it is a gzip encoded file, we need an extra gzip input filter
+ if ((magic & GZIP_MAGIC_MASK) == GZIP_MAGIC)
+ {
+ gunzip *gzin = NEW(gunzip, 1);
+ gzin->init(&u);
+ // FIXME: why the side effects? WHY?
+ u.gzin->start(magic);
+ u.start();
+ }
+ else
+ {
+ // otherwise, feed the bytes to the unpacker directly
+ u.start(peek, sizeof(peek));
+ }
+
+ // Note: The checks to u.aborting() are necessary to gracefully
+ // terminate processing when the first segment throws an error.
+ for (;;)
+ {
+ // Each trip through this loop unpacks one segment
+ // and then resets the unpacker.
+ for (unpacker::file *filep; (filep = u.get_next_file()) != nullptr;)
+ {
+ u.write_file_to_jar(filep);
+ }
+
+ // Peek ahead for more data.
+ magic = read_magic(&u, peek, (int)sizeof(peek));
+ if (magic != (int)JAVA_PACKAGE_MAGIC)
+ {
+ // we do not feel strongly about this kind of thing...
+ /*
+ if (magic != EOF_MAGIC)
+ unpack_abort("garbage after end of pack archive");
+ */
+ break; // all done
+ }
+
+ // Release all storage from parsing the old segment.
+ u.reset();
+ // Restart, beginning with the peek-ahead.
+ u.start(peek, sizeof(peek));
+ }
+ u.finish();
+ u.free(); // tidy up malloc blocks
+ fclose(input);
+}