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Date: Fri, 03 Apr 2009 18:41:57 +0200
From: Olivier Scalbert <olivier.scalbert@algosyn.com>
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Subject: Re: Load an object from a file
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Date: 2009-04-03T18:41:57+02:00
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Ludovic Brenta wrote:
> Georg Bauhaus wrote on comp.lang.ada:
>> Olivier Scalbert schrieb:
>>
>>> Thanks Ludovic,
>>> One more question:
>>> with:
>>>     type u2 is new Integer;
>>>     type cp_info is new Integer;
>>>     type Constant_Pool_Array is array (Positive range <>) of cp_info;
>>>     type Interfaces_Array is array (Positive range <>) of u2;
>> Make the index type the same as the type in the disciminant,
>> that is, u2.
>>
>>    type Constant_Pool_Array is array (u2 range <>) of cp_info;
>>    type Interfaces_Array is array (u2 range <>) of u2;
>>
>> since U2 is the type of the discriminants used in providing
>> the array bounds.
>>
>> In fact, very likely the type U2 is range 0 .. Something, with
>> Java's integer type semantics regarding overflow and wrap
>> around.  Perhaps it is a good idea to express this in Ada
>> for U2 as well.
> 
> Right; in fact, Java's u2 probably corresponds to
> 
> type u2 is mod 2 ** 32; -- or perhaps 64?
> 
> --
> Ludovic Brenta.A class file consists of a stream of 8-bit bytes. All 16-bit, 32-bit, and 64-bit quantities are constructed by reading in two, four, and eight consecutive 8-bit bytes, respectively. Multibyte data items are always stored in big-endian order, where the high bytes come first. In the Java and Java 2 platforms, this format is supported by interfaces java.io.DataInput and java.io.DataOutput and classes such as java.io.DataInputStream and java.io.DataOutputStream.

Yes it works !

I should focus on the domain problem.
I should focus on the domain problem.
I should focus on the domain problem.
I should focus on the domain problem.
I should focus on the domain problem.

For your info:
...
A class file consists of a stream of 8-bit bytes. All 16-bit, 32-bit, 
and 64-bit quantities are constructed by reading in two, four, and eight 
consecutive 8-bit bytes, respectively. Multibyte data items are always 
stored in big-endian order, where the high bytes come first.
...
This chapter defines its own set of data types representing class file 
data: The types u1, u2, and u4 represent an unsigned one-, two-, or 
four-byte quantity, respectively.
...

The firt 4 bytes that composed the magic field are:
0xCAFEBABE
;-)

Olivier