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Date: Fri, 03 Apr 2009 14:01:15 +0200
From: Olivier Scalbert <olivier.scalbert@algosyn.com>
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Subject: Load an object from a file
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Date: 2009-04-03T14:01:15+02:00
List-Id: <comp.lang.ada>

Hello everybody !

In my Ada self-study context, I was asking myself how can I create and 
fill objects or records from a file.
As an example, I have tried to represent a java class file format 
structure and fill it with a .class java file.

The ClassFile structure is something like:

     ClassFile {
     	u4 magic;
     	u2 minor_version;
     	u2 major_version;
     	u2 constant_pool_count;
     	cp_info constant_pool[constant_pool_count-1];
     	u2 access_flags;
     	u2 this_class;
     	u2 super_class;
     	u2 interfaces_count;
     	u2 interfaces[interfaces_count];
     	u2 fields_count;
     	field_info fields[fields_count];
     	u2 methods_count;
     	method_info methods[methods_count];
     	u2 attributes_count;
     	attribute_info attributes[attributes_count];
     }


JVM Specs can be found there:
http://java.sun.com/docs/books/jvms/second_edition/html/ClassFile.doc.html

I have no problem to represent and to fill from file, the first four fields.
But I do not know what is the best (Ada) way of representing the array 
of info constant_pool as the size is only known at run time.(= 
constant_pool_cout).
Also how can I fill this array ?

Thanks to help me and have a nice day.

Olivier