[pdf-tasks] [flyspray] Write new hash helpers for integer values

[GNU PDF Library]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Aleksander Morgado (aleksander) 

Attached to Project - GNU PDF Library
Summary - Write new hash helpers for integer values
Task Type - Planned Task
Category - Hash Module
Status - NEXT
Assigned To - 
Operating System - All
Severity - Low
Priority - Low
Reported Version - START
Due in Version - Undecided
Due Date - Undecided
Details - We currently have pdf_hash_get_bool() and pdf_hash_add_bool() to store and retrieve boolean values in the hashes. 

We could also have helper methods for other integer methods, like:
 pdf_hash_add_i32()
 pdf_hash_add_u32()
 pdf_hash_get_i32()
 pdf_hash_get_u32()

Note that 32bit-values can be stored directly without needing heap allocations: 
just store the values directly in the pointers (see add_bool() and get_bool() 
as examples).

I would skip u64 and i64 right now, as those may need heap allocations in 32bit 
(they are bigger than a pointer size). And I would also skip smaller types, as 
they can easily be casted to 32bit types.

Once this is done, we can use pdf_hash_get_i32() in the DCT decoder when getting the 
"ColorTransform" parameter value.

More information can be found at the following URL:
http://www.gnupdf.org/flyspray/index.php?do=details&task_id=130

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