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8317951: Refactor loading of zip library to help resolve JDK-8315220

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Reviewed-by: egahlin, dholmes
This commit is contained in:
Markus Grönlund 2023-10-31 10:02:40 +00:00
parent 576c9bccfb
commit d3c3f0e7c8
10 changed files with 269 additions and 137 deletions

56
src/hotspot/share/classfile/classLoader.cpp

@ -86,22 +86,6 @@ typedef int (*canonicalize_fn_t)(const char *orig, char *out, int len);
static canonicalize_fn_t CanonicalizeEntry = nullptr;
// Entry points in zip.dll for loading zip/jar file entries
typedef void * * (*ZipOpen_t)(const char *name, char **pmsg);
typedef void (*ZipClose_t)(jzfile *zip);
typedef jzentry* (*FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
typedef jboolean (*ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
typedef jint (*Crc32_t)(jint crc, const jbyte *buf, jint len);
static ZipOpen_t ZipOpen = nullptr;
static ZipClose_t ZipClose = nullptr;
static FindEntry_t FindEntry = nullptr;
static ReadEntry_t ReadEntry = nullptr;
static Crc32_t Crc32 = nullptr;
int ClassLoader::_libzip_loaded = 0;
void* ClassLoader::_zip_handle = nullptr;
// Entry points for jimage.dll for loading jimage file entries
static JImageOpen_t JImageOpen = nullptr;
@ -292,7 +276,7 @@ ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name,
}
ClassPathZipEntry::~ClassPathZipEntry() {
(*ZipClose)(_zip);
ZipLibrary::close(_zip);
FREE_C_HEAP_ARRAY(char, _zip_name);
}
@ -301,7 +285,7 @@ u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* f
ThreadToNativeFromVM ttn(current);
// check whether zip archive contains name
jint name_len;
jzentry* entry = (*FindEntry)(_zip, name, filesize, &name_len);
jzentry* entry = ZipLibrary::find_entry(_zip, name, filesize, &name_len);
if (entry == nullptr) return nullptr;
u1* buffer;
char name_buf[128];
@ -321,7 +305,9 @@ u1* ClassPathZipEntry::open_entry(JavaThread* current, const char* name, jint* f
size++;
}
buffer = NEW_RESOURCE_ARRAY(u1, size);
if (!(*ReadEntry)(_zip, entry, buffer, filename)) return nullptr;
if (!ZipLibrary::read_entry(_zip, entry, buffer, filename)) {
return nullptr;
}
// return result
if (nul_terminate) {
@ -724,8 +710,7 @@ jzfile* ClassLoader::open_zip_file(const char* canonical_path, char** error_msg,
// enable call to C land
ThreadToNativeFromVM ttn(thread);
HandleMark hm(thread);
load_zip_library_if_needed();
return (*ZipOpen)(canonical_path, error_msg);
return ZipLibrary::open(canonical_path, error_msg);
}
ClassPathEntry* ClassLoader::create_class_path_entry(JavaThread* current,
@ -937,32 +922,6 @@ void ClassLoader::load_java_library() {
CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, dll_lookup(javalib_handle, "JDK_Canonicalize", nullptr));
}
void ClassLoader::release_load_zip_library() {
ConditionalMutexLocker locker(Zip_lock, Zip_lock != nullptr, Monitor::_no_safepoint_check_flag);
if (_libzip_loaded == 0) {
load_zip_library();
Atomic::release_store(&_libzip_loaded, 1);
}
}
void ClassLoader::load_zip_library() {
assert(ZipOpen == nullptr, "should not load zip library twice");
char path[JVM_MAXPATHLEN];
char ebuf[1024];
if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
_zip_handle = os::dll_load(path, ebuf, sizeof ebuf);
}
if (_zip_handle == nullptr) {
vm_exit_during_initialization("Unable to load zip library", path);
}
ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, dll_lookup(_zip_handle, "ZIP_Open", path));
ZipClose = CAST_TO_FN_PTR(ZipClose_t, dll_lookup(_zip_handle, "ZIP_Close", path));
FindEntry = CAST_TO_FN_PTR(FindEntry_t, dll_lookup(_zip_handle, "ZIP_FindEntry", path));
ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, dll_lookup(_zip_handle, "ZIP_ReadEntry", path));
Crc32 = CAST_TO_FN_PTR(Crc32_t, dll_lookup(_zip_handle, "ZIP_CRC32", path));
}
void ClassLoader::load_jimage_library() {
assert(JImageOpen == nullptr, "should not load jimage library twice");
char path[JVM_MAXPATHLEN];
@ -982,8 +941,7 @@ void ClassLoader::load_jimage_library() {
}
int ClassLoader::crc32(int crc, const char* buf, int len) {
load_zip_library_if_needed();
return (*Crc32)(crc, (const jbyte*)buf, len);
return ZipLibrary::crc32(crc, (const jbyte*)buf, len);
}
oop ClassLoader::get_system_package(const char* name, TRAPS) {

24
src/hotspot/share/classfile/classLoader.hpp

@ -30,6 +30,7 @@
#include "runtime/perfDataTypes.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/macros.hpp"
#include "utilities/zipLibrary.hpp"
// The VM class loader.
#include <sys/stat.h>
@ -84,19 +85,6 @@ class ClassPathDirEntry: public ClassPathEntry {
ClassFileStream* open_stream(JavaThread* current, const char* name);
};
// Type definitions for zip file and zip file entry
typedef void* jzfile;
typedef struct {
char *name; /* entry name */
jlong time; /* modification time */
jlong size; /* size of uncompressed data */
jlong csize; /* size of compressed data (zero if uncompressed) */
jint crc; /* crc of uncompressed data */
char *comment; /* optional zip file comment */
jbyte *extra; /* optional extra data */
jlong pos; /* position of LOC header (if negative) or data */
} jzentry;
class ClassPathZipEntry: public ClassPathEntry {
private:
jzfile* _zip; // The zip archive
@ -227,8 +215,6 @@ class ClassLoader: AllStatic {
CDS_ONLY(static void add_to_module_path_entries(const char* path,
ClassPathEntry* entry);)
// cache the zip library handle
static void* _zip_handle;
public:
CDS_ONLY(static ClassPathEntry* app_classpath_entries() {return _app_classpath_entries;})
CDS_ONLY(static ClassPathEntry* module_path_entries() {return _module_path_entries;})
@ -247,16 +233,10 @@ class ClassLoader: AllStatic {
static void* dll_lookup(void* lib, const char* name, const char* path);
static void load_java_library();
static void load_zip_library();
static void load_jimage_library();
private:
static int _libzip_loaded; // used to sync loading zip.
static void release_load_zip_library();
public:
static inline void load_zip_library_if_needed();
static void* zip_library_handle() { return _zip_handle; }
static void* zip_library_handle();
static jzfile* open_zip_file(const char* canonical_path, char** error_msg, JavaThread* thread);
static ClassPathEntry* create_class_path_entry(JavaThread* current,
const char *path, const struct stat* st,

6
src/hotspot/share/classfile/classLoader.inline.hpp

@ -58,12 +58,6 @@ inline ClassPathEntry* ClassLoader::classpath_entry(int n) {
}
}
inline void ClassLoader::load_zip_library_if_needed() {
if (Atomic::load_acquire(&_libzip_loaded) == 0) {
release_load_zip_library();
}
}
#if INCLUDE_CDS
// Helper function used by CDS code to get the number of boot classpath

4
src/hotspot/share/prims/jvm.cpp

@ -103,6 +103,7 @@
#include "utilities/events.hpp"
#include "utilities/macros.hpp"
#include "utilities/utf8.hpp"
#include "utilities/zipLibrary.hpp"
#if INCLUDE_CDS
#include "classfile/systemDictionaryShared.hpp"
#endif
@ -3413,8 +3414,7 @@ JVM_END
// Library support ///////////////////////////////////////////////////////////////////////////
JVM_LEAF(void*, JVM_LoadZipLibrary())
ClassLoader::load_zip_library_if_needed();
return ClassLoader::zip_library_handle();
return ZipLibrary::handle();
JVM_END
JVM_ENTRY_NO_ENV(void*, JVM_LoadLibrary(const char* name, jboolean throwException))

2
src/hotspot/share/runtime/mutexLocker.cpp

@ -115,7 +115,6 @@ Monitor* Notification_lock = nullptr;
Monitor* PeriodicTask_lock = nullptr;
Monitor* RedefineClasses_lock = nullptr;
Mutex* Verify_lock = nullptr;
Monitor* Zip_lock = nullptr;
#if INCLUDE_JFR
Mutex* JfrStacktrace_lock = nullptr;
@ -324,7 +323,6 @@ void mutex_init() {
MUTEX_DEFN(ScratchObjects_lock , PaddedMutex , nosafepoint-1); // Holds DumpTimeTable_lock
#endif // INCLUDE_CDS
MUTEX_DEFN(Bootclasspath_lock , PaddedMutex , nosafepoint);
MUTEX_DEFN(Zip_lock , PaddedMonitor, nosafepoint-1); // Holds DumpTimeTable_lock
#if INCLUDE_JVMCI
// JVMCIRuntime::_lock must be acquired before JVMCI_lock to avoid deadlock

1
src/hotspot/share/runtime/mutexLocker.hpp

@ -111,7 +111,6 @@ extern Monitor* Notification_lock; // a lock used for notification
extern Monitor* PeriodicTask_lock; // protects the periodic task structure
extern Monitor* RedefineClasses_lock; // locks classes from parallel redefinition
extern Mutex* Verify_lock; // synchronize initialization of verify library
extern Monitor* Zip_lock; // synchronize initialization of zip library
extern Monitor* ThreadsSMRDelete_lock; // Used by ThreadsSMRSupport to take pressure off the Threads_lock
extern Mutex* ThreadIdTableCreate_lock; // Used by ThreadIdTable to lazily create the thread id table
extern Mutex* SharedDecoder_lock; // serializes access to the decoder during normal (not error reporting) use

58
src/hotspot/share/services/heapDumperCompression.cpp

@ -25,11 +25,9 @@
#include "precompiled.hpp"
#include "jvm.h"
#include "runtime/arguments.hpp"
#include "runtime/javaThread.hpp"
#include "runtime/mutexLocker.hpp"
#include "runtime/os.hpp"
#include "services/heapDumperCompression.hpp"
#include "utilities/zipLibrary.hpp"
char const* FileWriter::open_writer() {
@ -62,74 +60,28 @@ char const* FileWriter::write_buf(char* buf, ssize_t size) {
return nullptr;
}
typedef char const* (*GzipInitFunc)(size_t, size_t*, size_t*, int);
typedef size_t(*GzipCompressFunc)(char*, size_t, char*, size_t, char*, size_t,
int, char*, char const**);
static GzipInitFunc gzip_init_func;
static GzipCompressFunc gzip_compress_func;
void* GZipCompressor::load_gzip_func(char const* name) {
char path[JVM_MAXPATHLEN];
char ebuf[1024];
void* handle;
MutexLocker locker(Zip_lock, Monitor::_no_safepoint_check_flag);
if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), "zip")) {
handle = os::dll_load(path, ebuf, sizeof ebuf);
if (handle != nullptr) {
return os::dll_lookup(handle, name);
}
}
return nullptr;
}
char const* GZipCompressor::init(size_t block_size, size_t* needed_out_size,
size_t* needed_tmp_size) {
_block_size = block_size;
_is_first = true;
if (gzip_compress_func == nullptr) {
gzip_compress_func = (GzipCompressFunc) load_gzip_func("ZIP_GZip_Fully");
if (gzip_compress_func == nullptr) {
return "Cannot get ZIP_GZip_Fully function";
}
}
if (gzip_init_func == nullptr) {
gzip_init_func = (GzipInitFunc) load_gzip_func("ZIP_GZip_InitParams");
if (gzip_init_func == nullptr) {
return "Cannot get ZIP_GZip_InitParams function";
}
}
char const* result = gzip_init_func(block_size, needed_out_size,
needed_tmp_size, _level);
char const* result = ZipLibrary::init_params(block_size, needed_out_size,
needed_tmp_size, _level);
*needed_out_size += 1024; // Add extra space for the comment in the first chunk.
return result;
}
char const* GZipCompressor::compress(char* in, size_t in_size, char* out, size_t out_size,
char* tmp, size_t tmp_size, size_t* compressed_size) {
char const* msg = nullptr;
if (_is_first) {
char buf[128];
// Write the block size used as a comment in the first gzip chunk, so the
// code used to read it later can make a good choice of the buffer sizes it uses.
jio_snprintf(buf, sizeof(buf), "HPROF BLOCKSIZE=" SIZE_FORMAT, _block_size);
*compressed_size = gzip_compress_func(in, in_size, out, out_size, tmp, tmp_size, _level,
buf, &msg);
*compressed_size = ZipLibrary::compress(in, in_size, out, out_size, tmp, tmp_size, _level, buf, &msg);
_is_first = false;
} else {
*compressed_size = gzip_compress_func(in, in_size, out, out_size, tmp, tmp_size, _level,
nullptr, &msg);
*compressed_size = ZipLibrary::compress(in, in_size, out, out_size, tmp, tmp_size, _level, nullptr, &msg);
}
return msg;

3
src/hotspot/share/services/heapDumperCompression.hpp

@ -1,5 +1,6 @@
/*
* Copyright (c) 2020 SAP SE. All rights reserved.
* Copyright (c) 2023, 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
@ -90,8 +91,6 @@ private:
size_t _block_size;
bool _is_first;
void* load_gzip_func(char const* name);
public:
GZipCompressor(int level) : _level(level), _block_size(0), _is_first(false) {
}

197
src/hotspot/share/utilities/zipLibrary.cpp Normal file

@ -0,0 +1,197 @@
/*
* Copyright (c) 2023, 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.
*
* 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 "precompiled.hpp"
#include "jvm_io.h"
#include "runtime/arguments.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "runtime/os.inline.hpp"
#include "runtime/semaphore.inline.hpp"
#include "runtime/thread.inline.hpp"
#include "utilities/zipLibrary.hpp"
// Entry points in zip.dll for loading zip/jar file entries
typedef void**(*ZIP_Open_t)(const char* name, char** pmsg);
typedef void(*ZIP_Close_t)(jzfile* zip);
typedef jzentry* (*ZIP_FindEntry_t)(jzfile* zip, const char* name, jint* sizeP, jint* nameLen);
typedef jboolean(*ZIP_ReadEntry_t)(jzfile* zip, jzentry* entry, unsigned char* buf, char* namebuf);
typedef jint(*ZIP_CRC32_t)(jint crc, const jbyte* buf, jint len);
typedef const char* (*ZIP_GZip_InitParams_t)(size_t, size_t*, size_t*, int);
typedef size_t(*ZIP_GZip_Fully_t)(char*, size_t, char*, size_t, char*, size_t, int, char*, char const**);
static ZIP_Open_t ZIP_Open = nullptr;
static ZIP_Close_t ZIP_Close = nullptr;
static ZIP_FindEntry_t ZIP_FindEntry = nullptr;
static ZIP_ReadEntry_t ZIP_ReadEntry = nullptr;
static ZIP_CRC32_t ZIP_CRC32 = nullptr;
static ZIP_GZip_InitParams_t ZIP_GZip_InitParams = nullptr;
static ZIP_GZip_Fully_t ZIP_GZip_Fully = nullptr;
static void* _zip_handle = nullptr;
static bool _loaded = false;
static inline bool is_loaded() {
return Atomic::load_acquire(&_loaded);
}
static inline bool not_loaded() {
return !is_loaded();
}
static void* dll_lookup(const char* name, const char* path, bool vm_exit_on_failure) {
assert(_zip_handle != nullptr, "invariant");
void* func = os::dll_lookup(_zip_handle, name);
if (func == nullptr && vm_exit_on_failure) {
char msg[256] = "";
jio_snprintf(&msg[0], sizeof msg, "Could not resolve \"%s\"", name);
vm_exit_during_initialization(&msg[0], path);
}
return func;
}
static void store_function_pointers(const char* path, bool vm_exit_on_failure) {
assert(_zip_handle != nullptr, "invariant");
ZIP_Open = CAST_TO_FN_PTR(ZIP_Open_t, dll_lookup("ZIP_Open", path, vm_exit_on_failure));
ZIP_Close = CAST_TO_FN_PTR(ZIP_Close_t, dll_lookup("ZIP_Close", path, vm_exit_on_failure));
ZIP_FindEntry = CAST_TO_FN_PTR(ZIP_FindEntry_t, dll_lookup("ZIP_FindEntry", path, vm_exit_on_failure));
ZIP_ReadEntry = CAST_TO_FN_PTR(ZIP_ReadEntry_t, dll_lookup("ZIP_ReadEntry", path, vm_exit_on_failure));
ZIP_CRC32 = CAST_TO_FN_PTR(ZIP_CRC32_t, dll_lookup("ZIP_CRC32", path, vm_exit_on_failure));
// The following entry points are most likely optional from a zip library implementation perspective.
// Hence no vm_exit on a resolution failure. Further refactorings should investigate this,
// and if possible, streamline setting all entry points consistently.
ZIP_GZip_InitParams = CAST_TO_FN_PTR(ZIP_GZip_InitParams_t, dll_lookup("ZIP_GZip_InitParams", path, false));
ZIP_GZip_Fully = CAST_TO_FN_PTR(ZIP_GZip_Fully_t, dll_lookup("ZIP_GZip_Fully", path, false));
}
static void load_zip_library(bool vm_exit_on_failure) {
assert(!is_loaded(), "should not load zip library twice");
char path[JVM_MAXPATHLEN];
if (os::dll_locate_lib(&path[0], sizeof path, Arguments::get_dll_dir(), "zip")) {
char ebuf[1024];
_zip_handle = os::dll_load(&path[0], &ebuf[0], sizeof ebuf);
}
if (_zip_handle == nullptr) {
if (vm_exit_on_failure) {
vm_exit_during_initialization("Unable to load zip library", &path[0]);
}
return;
}
store_function_pointers(&path[0], vm_exit_on_failure);
Atomic::release_store(&_loaded, true);
assert(is_loaded(), "invariant");
}
//
// Helper mutex class that also ensures that java threads
// are in _thread_in_native when loading the zip library.
//
class ZipLibraryLoaderLock : public StackObj {
private:
static Semaphore _lock;
JavaThread* _jt;
public:
ZipLibraryLoaderLock() : _jt(nullptr) {
Thread* thread = Thread::current_or_null();
if (thread != nullptr && thread->is_Java_thread()) {
JavaThread* const jt = JavaThread::cast(thread);
if (jt->thread_state() != _thread_in_native) {
_jt = jt;
ThreadStateTransition::transition_from_vm(jt, _thread_in_native, false);
}
}
_lock.wait();
}
~ZipLibraryLoaderLock() {
_lock.signal();
if (_jt != nullptr) {
ThreadStateTransition::transition_from_native(_jt, _thread_in_vm, false);
}
}
};
Semaphore ZipLibraryLoaderLock::_lock(1);
static void initialize(bool vm_exit_on_failure = true) {
if (is_loaded()) {
return;
}
ZipLibraryLoaderLock lock;
if (not_loaded()) {
load_zip_library(vm_exit_on_failure);
}
}
void** ZipLibrary::open(const char* name, char** pmsg) {
initialize();
assert(ZIP_Open != nullptr, "invariant");
return ZIP_Open(name, pmsg);
}
void ZipLibrary::close(jzfile* zip) {
assert(is_loaded(), "invariant");
assert(ZIP_Close != nullptr, "invariant");
ZIP_Close(zip);
}
jzentry* ZipLibrary::find_entry(jzfile* zip, const char* name, jint* sizeP, jint* nameLen) {
initialize();
assert(ZIP_FindEntry != nullptr, "invariant");
return ZIP_FindEntry(zip, name, sizeP, nameLen);
}
jboolean ZipLibrary::read_entry(jzfile* zip, jzentry* entry, unsigned char* buf, char* namebuf) {
initialize();
assert(ZIP_ReadEntry != nullptr, "invariant");
return ZIP_ReadEntry(zip, entry, buf, namebuf);
}
jint ZipLibrary::crc32(jint crc, const jbyte* buf, jint len) {
initialize();
assert(ZIP_CRC32 != nullptr, "invariant");
return ZIP_CRC32(crc, buf, len);
}
const char* ZipLibrary::init_params(size_t block_size, size_t* needed_out_size, size_t* needed_tmp_size, int level) {
initialize(false);
if (ZIP_GZip_InitParams == nullptr) {
return "Cannot get ZIP_GZip_InitParams function";
}
return ZIP_GZip_InitParams(block_size, needed_out_size, needed_tmp_size, level);
}
size_t ZipLibrary::compress(char* in, size_t in_size, char* out, size_t out_size, char* tmp, size_t tmp_size, int level, char* buf, const char** pmsg) {
initialize(false);
if (ZIP_GZip_Fully == nullptr) {
*pmsg = "Cannot get ZIP_GZip_Fully function";
return 0;
}
return ZIP_GZip_Fully(in, in_size, out, out_size, tmp, tmp_size, level, buf, pmsg);
}
void* ZipLibrary::handle() {
initialize();
assert(is_loaded(), "invariant");
assert(_zip_handle != nullptr, "invariant");
return _zip_handle;
}

55
src/hotspot/share/utilities/zipLibrary.hpp Normal file

@ -0,0 +1,55 @@
/*
* Copyright (c) 2023, 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.
*
* 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.
*
*/
#ifndef SHARE_UTILITIES_ZIPLIBRARY_HPP
#define SHARE_UTILITIES_ZIPLIBRARY_HPP
#include "memory/allocation.hpp"
// Type definitions for zip file and zip file entry
typedef void* jzfile;
typedef struct {
char* name; /* entry name */
jlong time; /* modification time */
jlong size; /* size of uncompressed data */
jlong csize; /* size of compressed data (zero if uncompressed) */
jint crc; /* crc of uncompressed data */
char* comment; /* optional zip file comment */
jbyte* extra; /* optional extra data */
jlong pos; /* position of LOC header (if negative) or data */
} jzentry;
class ZipLibrary : AllStatic {
public:
static void** open(const char* name, char** pmsg);
static void close(jzfile* zip);
static jzentry* find_entry(jzfile* zip, const char* name, jint* sizeP, jint* nameLen);
static jboolean read_entry(jzfile* zip, jzentry* entry, unsigned char* buf, char* namebuf);
static jint crc32(jint crc, const jbyte* buf, jint len);
static const char* init_params(size_t block_size, size_t* needed_out_size, size_t* needed_tmp_size, int level);
static size_t compress(char* in, size_t in_size, char* out, size_t out_size, char* tmp, size_t tmp_size, int level, char* buf, const char** pmsg);
static void* handle();
};
#endif // SHARE_UTILITIES_ZIPLIBRARY_HPP