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attributes.c

/* libjclass - Library for reading java class files
 * Copyright (C) 2003  Nicos Panayides
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Id: attributes.c,v 1.16 2003/10/23 12:41:19 anarxia Exp $
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <string.h>

#include <jclass/attributes.h>
#include <jclass/jstring.h>

/**
* jclass_attribute_container_has_attribute
* @container: The container to check.
* @attribute_name: The name of the attribute to look for.
* @cpool: The constant pool for the class.
*
* Checks if the given attribute container contains a specific attribute.
*
* Returns:  1 if the container has the given attribute, 0 otherwise.
*/
int jclass_attribute_container_has_attribute(const AttributeContainer* container, 
      const char* attribute_name, const ConstantPool* constant_pool)
{
      int is_synthetic;
      char* attr_name;
      UTF8Entry* attr_info;
      
      if(container == NULL)
            return 0;

      attr_info = constant_pool->entries[container->name_index].info.utf8;
      attr_name = jclass_utf8_to_string(attr_info->contents, attr_info->length);

      is_synthetic = !strcmp(attribute_name, attr_name);
      free(attr_name);

      return is_synthetic;
}

/**
* jclass_constantvalue_attribute_new
* @container: The attribute container.
*
* Extracts an constantvalue attribute from its attribute container.
*
* Returns: A newly constructed ConstantValue attribute.
*/
ConstantValueAttribute* jclass_constantvalue_attribute_new(const AttributeContainer* container)
{
      ConstantValueAttribute* attribute;
      attribute = (ConstantValueAttribute*) malloc(sizeof(ConstantValueAttribute));
      
      memcpy(&attribute->cp_index, &(container->contents[0]), 2);
      attribute->cp_index = UINT16_NATIVE(attribute->cp_index);
      return attribute;
}

/**
* jclass_constantvalue_attribute_free
* @attribute: The constant value attribute to free.
*
* Frees a constant value attribute.
*/
void jclass_constantvalue_attribute_free(ConstantValueAttribute* attribute)
{
      free(attribute);
}

/**
* jclass_sourcefile_attribute_new
* @container: The attribute container.
*
* Extracts a sourcefile attribute from its attribute container.
*
* Returns: A newly constructed SourceFileAttribute.
*/
SourceFileAttribute* jclass_sourcefile_attribute_new(const AttributeContainer* container)
{
      SourceFileAttribute* attribute;
      attribute = (SourceFileAttribute*) malloc(sizeof(SourceFileAttribute));
      
      memcpy(&attribute->filename_index, &(container->contents[0]), 2);
      attribute->filename_index = UINT16_NATIVE(attribute->filename_index);
      
      return attribute;
}

/**
* jclass_sourcefile_attribute_free
* @attribute: The source file attribute to free.
*
* Frees a source file attribute. 
*/
void jclass_sourcefile_attribute_free(SourceFileAttribute* attribute)
{
      free(attribute);
}

/**
* jclass_exceptions_attribute_new
* @container: The attribute container.
*
* Extracts an exceptions attribute from its attribute container.
*
* Returns: A newly constructed ExceptionsAttribute.
*/
ExceptionsAttribute* jclass_exceptions_attribute_new(const AttributeContainer* container)
{
      ExceptionsAttribute* attribute;
      uint16_t j;
      
      attribute = (ExceptionsAttribute*) malloc(sizeof(ExceptionsAttribute));
      
      memcpy(&attribute->no_exceptions, &(container->contents[0]), 2);
      attribute->no_exceptions = UINT16_NATIVE(attribute->no_exceptions);
      
      if(attribute->no_exceptions)
            attribute->exception_index = (uint16_t*) malloc(sizeof(uint16_t) * attribute->no_exceptions);
      else
            attribute->exception_index = NULL;

      for(j = 0; j < attribute->no_exceptions; j++)
      {
            memcpy(&attribute->exception_index[j], &(container->contents[(j*2) + 2]), 2);
            attribute->exception_index[j] = UINT16_NATIVE(attribute->exception_index[j]);
      }
      
      return attribute;
}

/**
* jclass_exceptions_attribute_free
* @attribute: The exception attribute to free.
*
* Frees an exceptions attribute.
*/
void jclass_exceptions_attribute_free(ExceptionsAttribute* attribute)
{
      if(attribute->exception_index != NULL)
            free(attribute->exception_index);
      
      free(attribute);
}

/**
* jclass_innerclasses_attribute_new
* @container: The attribute container.
*
* Extracts an innerclass attribute from its attribute container.
*
* Returns: A newly constructed InnerClassesAttribute.
*/
InnerClassesAttribute* jclass_innerclasses_attribute_new(const AttributeContainer* container)
{
      InnerClassesAttribute* attrib;
      uint16_t j;
      uint16_t temp;
      
      attrib = (InnerClassesAttribute*) malloc(sizeof(InnerClassesAttribute));
      
      memcpy(&temp, &(container->contents[0]), 2);
      attrib->no_innerclasses = UINT16_NATIVE(temp);
      
      if(attrib->no_innerclasses)
            attrib->classes = (InnerClassInfo*) malloc(attrib->no_innerclasses * sizeof(InnerClassInfo));
      else
            attrib->classes = NULL;
            
      for(j = 0; j < attrib->no_innerclasses; j++)
      {
            memcpy(&temp, &(container->contents[(j*8) + 2]), 2);
            attrib->classes[j].type_index = UINT16_NATIVE(temp);
            memcpy(&temp, &(container->contents[(j*8) + 4]), 2);
            attrib->classes[j].outer_class_type_index = UINT16_NATIVE(temp);
            memcpy(&temp, &(container->contents[(j*8) + 6]), 2);
            attrib->classes[j].name_index = UINT16_NATIVE(temp);
            memcpy(&temp, &(container->contents[(j*8) + 8]), 2);
            attrib->classes[j].access_flags = UINT16_NATIVE(temp);
      }

      return attrib;
}

/**
* jclass_innerclasses_attribute_free
* @attribute: The innerclasses attribute to free.
*
* Frees an innerclasses attribute.
*/
void jclass_innerclasses_attribute_free(InnerClassesAttribute* attribute)
{
      if(attribute->classes != NULL)
            free(attribute->classes);
      free(attribute);
}

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