/*

 * Copyright (c) 2004, 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 <string.h>

#include <stdlib.h>

#include "jni.h"

#include "manifest_info.h"

#include "JarFacade.h"

typedef struct {

    jarAttribute* head;

    jarAttribute* tail;

} iterationContext;

static void

doAttribute(const char* name, const char* value, void* user_data) {

    iterationContext* context = (iterationContext*) user_data;

    jarAttribute* attribute = (jarAttribute*)malloc(sizeof(jarAttribute));

    if (attribute != NULL) {

        attribute->name = strdup(name);

        if (attribute->name == NULL) {

            free(attribute);

        } else {

            char *begin = (char *)value;

            char *end;

            size_t value_len;

            /* skip any leading white space */

            while (*begin == ' ') {

                begin++;

            }

            /* skip any trailing white space */

            end = &begin[strlen(begin)];

            while (end > begin && end[-1] == ' ') {

                end--;

            }

            if (begin == end) {

                /* no value so skip this attribute */

                free(attribute->name);

                free(attribute);

                return;

            }

            value_len = (size_t)(end - begin);

            attribute->value = malloc(value_len + 1);

            if (attribute->value == NULL) {

                free(attribute->name);

                free(attribute);

            } else {

                /* save the value without leading or trailing whitespace */

                strncpy(attribute->value, begin, value_len);

                attribute->value[value_len] = '\0';

                attribute->next = NULL;

                if (context->head == NULL) {

                    context->head = attribute;

                } else {

                    context->tail->next = attribute;

                }

                context->tail = attribute;

            }

        }

    }

}

/*

 * Return a list of attributes from the main section of the given JAR

 * file. Returns NULL if there is an error or there aren't any attributes.

 */

jarAttribute*

readAttributes(const char* jarfile)

{

    int rc;

    iterationContext context = { NULL, NULL };

    rc = JLI_ManifestIterate(jarfile, doAttribute, (void*)&context);

    if (rc == 0) {

        return context.head;

    } else {

        freeAttributes(context.head);

        return NULL;

    }

}

/*

 * Free a list of attributes

 */

void

freeAttributes(jarAttribute* head) {

    while (head != NULL) {

        jarAttribute* next = (jarAttribute*)head->next;

        free(head->name);

        free(head->value);

        free(head);

        head = next;

    }

}

/*

 * Get the value of an attribute in an attribute list. Returns NULL

 * if attribute not found.

 */

char*

getAttribute(const jarAttribute* attributes, const char* name) {

    while (attributes != NULL) {

        if (strcasecmp(attributes->name, name) == 0) {

            return attributes->value;

        }

        attributes = (jarAttribute*)attributes->next;

    }

    return NULL;

}