/*

 * Copyright (c) 2015, 2017, 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 <stdlib.h>

#include <string.h>

#include "jni.h"

#include "jni_util.h"

#include "jvm.h"

#include "java_lang_Module.h"

/*

 * Gets the UTF-8 chars for the string and translates '.' to '/'.  Does no

 * further validation, assumption being that both calling code in

 * java.lang.Module and VM will do deeper validation.

 */

static char*

GetInternalPackageName(JNIEnv *env, jstring pkg, char* buf, jsize buf_size)

{

    jsize len;

    jsize unicode_len;

    char* p;

    char* utf_str;

    len = (*env)->GetStringUTFLength(env, pkg);

    unicode_len = (*env)->GetStringLength(env, pkg);

    if (len >= buf_size) {

        utf_str = malloc(len + 1);

        if (utf_str == NULL) {

            JNU_ThrowOutOfMemoryError(env, NULL);

            return NULL;

        }

    } else {

        utf_str = buf;

    }

    (*env)->GetStringUTFRegion(env, pkg, 0, unicode_len, utf_str);

    p = utf_str;

    while (*p != '\0') {

        if (*p == '.') {

            *p = '/';

        }

        p++;

    }

    return utf_str;

}

JNIEXPORT void JNICALL

Java_java_lang_Module_defineModule0(JNIEnv *env, jclass cls, jobject module,

                                            jboolean is_open, jstring version,

                                            jstring location, jobjectArray packages)

{

    char** pkgs = NULL;

    jsize num_packages = (*env)->GetArrayLength(env, packages);

    if (num_packages != 0 && (pkgs = calloc(num_packages, sizeof(char*))) == NULL) {

        JNU_ThrowOutOfMemoryError(env, NULL);

        return;

    } else if ((*env)->EnsureLocalCapacity(env, (jint)num_packages) == 0) {

        jboolean failed = JNI_FALSE;

        int idx;

        for (idx = 0; idx < num_packages; idx++) {

            jstring pkg = (*env)->GetObjectArrayElement(env, packages, idx);

            char* name = GetInternalPackageName(env, pkg, NULL, 0);

            if (name != NULL) {

                pkgs[idx] = name;

            } else {

                failed = JNI_TRUE;

                break;

            }

        }

        if (!failed) {

            JVM_DefineModule(env, module, is_open, version, location,

                             (const char* const*)pkgs, num_packages);

        }

    }

    if (num_packages > 0) {

        int idx;

        for (idx = 0; idx < num_packages; idx++) {

            if (pkgs[idx] != NULL) {

                free(pkgs[idx]);

            }

        }

        free(pkgs);

    }

}

JNIEXPORT void JNICALL

Java_java_lang_Module_addReads0(JNIEnv *env, jclass cls, jobject from, jobject to)

{

    JVM_AddReadsModule(env, from, to);

}

JNIEXPORT void JNICALL

Java_java_lang_Module_addExports0(JNIEnv *env, jclass cls, jobject from,

                                  jstring pkg, jobject to)

{

    char buf[128];

    char* pkg_name;

    if (pkg == NULL) {

        JNU_ThrowNullPointerException(env, "package is null");

        return;

    }

    pkg_name = GetInternalPackageName(env, pkg, buf, (jsize)sizeof(buf));

    if (pkg_name != NULL) {

        JVM_AddModuleExports(env, from, pkg_name, to);

        if (pkg_name != buf) {

            free(pkg_name);

        }

    }

}

JNIEXPORT void JNICALL

Java_java_lang_Module_addExportsToAll0(JNIEnv *env, jclass cls, jobject from,

                                       jstring pkg)

{

    char buf[128];

    char* pkg_name;

    if (pkg == NULL) {

        JNU_ThrowNullPointerException(env, "package is null");

        return;

    }

    pkg_name = GetInternalPackageName(env, pkg, buf, (jsize)sizeof(buf));

    if (pkg_name != NULL) {

        JVM_AddModuleExportsToAll(env, from, pkg_name);

        if (pkg_name != buf) {

            free(pkg_name);

        }

    }

}

JNIEXPORT void JNICALL

Java_java_lang_Module_addExportsToAllUnnamed0(JNIEnv *env, jclass cls,

                                              jobject from, jstring pkg)

{

    char buf[128];

    char* pkg_name;

    if (pkg == NULL) {

        JNU_ThrowNullPointerException(env, "package is null");

        return;

    }

    pkg_name = GetInternalPackageName(env, pkg, buf, (jsize)sizeof(buf));

    if (pkg_name != NULL) {

        JVM_AddModuleExportsToAllUnnamed(env, from, pkg_name);

        if (pkg_name != buf) {

            free(pkg_name);

        }

    }

}