Re: [Libexif-devel] Re:sizeof(long) == 4?

[matthieu c. <cas...@fr...>]

Jan Patera wrote:

>Joerg,
>
>unless you equip libexif with definitions of uint16_t, uint32_t
>and int32_t, this "simple" change will break compilability for many
>platforms. E.g. MSVC does not know such types (is it in some latest C++
>standard?).
>
> --- Jan
>
>  
>
>>On Thu, Mar 18, 2004 at 03:45:52PM +0100, Hans Ulrich Niedermann wrote:
>>    
>>
>>>Definitely. For formats of a fixed size, one should always use
>>>u?int(8|16|32)_t. If required, ship a _stdint.h and do some automake
>>>and #ifdef magic.
>>>      
>>>
>>I've looked into exif-utils.h and did small changes to:
>>
>>typedef char            ExifByte;          /* 1 byte  */
>>typedef char *          ExifAscii;
>>typedef uint16_t        ExifShort;         /* 2 bytes */
>>typedef uint32_t        ExifLong;          /* 4 bytes */
>>typedef struct {ExifLong numerator; ExifLong denominator;} ExifRational;
>>typedef char            ExifUndefined;     /* 1 byte  */
>>typedef int32_t         ExifSLong;         /* 4 bytes */
>>typedef struct {ExifSLong numerator; ExifSLong denominator;}
>>ExifSRational;
>>
>>
>>Now, all problems should disappear. Only some printf-Statements, which
>>need format modifier for eg ExifLong, are throwing warnings. Are there
>>any specifier for uint32_t which can be used with printf and friends?
>>
>>Joerg
>>    
>>
>
>
>
>
>
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>  
>
you could add something like that for those broken compilers (from 
ffmpeg libavcodec/common.h)
#ifndef EMULATE_INTTYPES
#   include <inttypes.h>
#else
    typedef signed char  int8_t;
    typedef signed short int16_t;
    typedef signed int   int32_t;
    typedef unsigned char  uint8_t;
    typedef unsigned short uint16_t;
    typedef unsigned int   uint32_t;

#   ifdef CONFIG_WIN32
        typedef signed __int64   int64_t;
        typedef unsigned __int64 uint64_t;
#   else /* other OS */
        typedef signed long long   int64_t;
        typedef unsigned long long uint64_t;
#   endif /* other OS */
#endif /* HAVE_INTTYPES_H */