/*

 * Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#include "jni.h"

// Opaque reference to a JImage file.

class JImageFile;

// Opaque reference to an image file resource location.

typedef jlong JImageLocationRef;

// Max path length limit independent of platform.  Windows max path is 1024,

// other platforms use 4096.

#define JIMAGE_MAX_PATH 4096

// JImage Error Codes

// Resource was not found

#define JIMAGE_NOT_FOUND (0)

// The image file is not prefixed with 0xCAFEDADA

#define JIMAGE_BAD_MAGIC (-1)

// The image file does not have a compatible (translatable) version

#define JIMAGE_BAD_VERSION (-2)

// The image file content is malformed

#define JIMAGE_CORRUPTED (-3)

/*

 * JImageOpen - Given the supplied full path file name, open an image file. This

 * function will also initialize tables and retrieve meta-data necessary to

 * satisfy other functions in the API. If the image file has been previously

 * open, a new open request will share memory and resources used by the previous

 * open. A call to JImageOpen should be balanced by a call to JImageClose, to

 * release memory and resources used. If the image file is not found or cannot

 * be open, then NULL is returned and error will contain a reason for the

 * failure; a positive value for a system error number, negative for a jimage

 * specific error (see JImage Error Codes.)

 *

 *  Ex.

 *   jint error;

 *   JImageFile* jimage = (*JImageOpen)(JAVA_HOME "lib/modules", &error);

 *   if (image == NULL) {

 *     tty->print_cr("JImage failed to open: %d", error);

 *     ...

 *   }

 *   ...

 */

extern "C" JNIEXPORT JImageFile*

JIMAGE_Open(const char *name, jint* error);

typedef JImageFile* (*JImageOpen_t)(const char *name, jint* error);

/*

 * JImageClose - Given the supplied open image file (see JImageOpen), release

 * memory and resources used by the open file and close the file. If the image

 * file is shared by other uses, release and close is deferred until the last use

 * is also closed.

 *

 * Ex.

 *  (*JImageClose)(image);

 */

extern "C" JNIEXPORT void

JIMAGE_Close(JImageFile* jimage);

typedef void (*JImageClose_t)(JImageFile* jimage);

/*

 * JImagePackageToModule - Given an open image file (see JImageOpen) and the name

 * of a package, return the name of module where the package resides. If the

 * package does not exist in the image file, the function returns NULL.

 * The resulting string does/should not have to be released. All strings are

 * utf-8, zero byte terminated.

 *

 * Ex.

 *  const char* package = (*JImagePackageToModule)(image, "java/lang");

 *  tty->print_cr(package);

 *  -> java.base

 */

extern "C" JNIEXPORT const char *

JIMAGE_PackageToModule(JImageFile* jimage, const char* package_name);

typedef const char* (*JImagePackageToModule_t)(JImageFile* jimage, const char* package_name);

/*

 * JImageFindResource - Given an open image file (see JImageOpen), a module

 * name, a version string and the name of a class/resource, return location

 * information describing the resource and its size. If no resource is found, the

 * function returns JIMAGE_NOT_FOUND and the value of size is undefined.

 * The version number should be "9.0" and is not used in locating the resource.

 * The resulting location does/should not have to be released.

 * All strings are utf-8, zero byte terminated.

 *

 *  Ex.

 *   jlong size;

 *   JImageLocationRef location = (*JImageFindResource)(image,

 *                                "java.base", "9.0", "java/lang/String.class", &size);

 */

extern "C" JNIEXPORT JImageLocationRef JIMAGE_FindResource(JImageFile* jimage,

        const char* module_name, const char* version, const char* name,

        jlong* size);

typedef JImageLocationRef(*JImageFindResource_t)(JImageFile* jimage,

        const char* module_name, const char* version, const char* name,

        jlong* size);

/*

 * JImageGetResource - Given an open image file (see JImageOpen), a resource's

 * location information (see JImageFindResource), a buffer of appropriate

 * size and the size, retrieve the bytes associated with the

 * resource. If the size is less than the resource size then the read is truncated.

 * If the size is greater than the resource size then the remainder of the buffer

 * is zero filled.  The function will return the actual size of the resource.

 *

 * Ex.

 *  jlong size;

 *  JImageLocationRef location = (*JImageFindResource)(image,

 *                               "java.base", "9.0", "java/lang/String.class", &size);

 *  char* buffer = new char[size];

 *  (*JImageGetResource)(image, location, buffer, size);

 */

extern "C" JNIEXPORT jlong

JIMAGE_GetResource(JImageFile* jimage, JImageLocationRef location,

        char* buffer, jlong size);

typedef jlong(*JImageGetResource_t)(JImageFile* jimage, JImageLocationRef location,

        char* buffer, jlong size);

/*

 * JImageResourceIterator - Given an open image file (see JImageOpen), a visitor

 * function and a visitor argument, iterator through each of the image's resources.

 * The visitor function is called with the image file, the module name, the

 * package name, the base name, the extension and the visitor argument. The return

 * value of the visitor function should be true, unless an early iteration exit is

 * required. All strings are utf-8, zero byte terminated.file.

 *

 * Ex.

 *   bool ctw_visitor(JImageFile* jimage, const char* module_name, const char* version,

 *                  const char* package, const char* name, const char* extension, void* arg) {

 *     if (strcmp(extension, "class") == 0) {

 *       char path[JIMAGE_MAX_PATH];

 *       Thread* THREAD = Thread::current();

 *       jio_snprintf(path, JIMAGE_MAX_PATH - 1, "/%s/%s", package, name);

 *       ClassLoader::compile_the_world_in(path, (Handle)arg, THREAD);

 *       return !HAS_PENDING_EXCEPTION;

 *     }

 *     return true;

 *   }

 *   (*JImageResourceIterator)(image, ctw_visitor, loader);

 */

typedef bool (*JImageResourceVisitor_t)(JImageFile* jimage,

        const char* module_name, const char* version, const char* package,

        const char* name, const char* extension, void* arg);

extern "C" JNIEXPORT void

JIMAGE_ResourceIterator(JImageFile* jimage,

        JImageResourceVisitor_t visitor, void *arg);

typedef void (*JImageResourceIterator_t)(JImageFile* jimage,

        JImageResourceVisitor_t visitor, void* arg);