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