[gdal-dev] CPLCalloc() used for small memory allocations. And for big ones?

[Abel Pau]

Hi,

I am currently working on a driver and have been utilizing CPL_calloc(). However, when attempting to pass the Actions, I encounter errors such as:

warning C4244: 'function': conversion from 'MM_INTERNAL_FID' to 'size_t', possible loss of data

This issue can be addressed by casting 'MM_INTERNAL_FID' (which is a GUInt64, essentially an unsigned long long) to 'size_t' (also essentially an unsigned long long). So, utilizing a cast is not problematic in this context.

However, I noticed in the function description it states "used for small memory allocations," which prompts me to inquire if there is an alternative calloc function for larger memory allocations. If not, I will proceed with casting the variable in all instances. Nonetheless, I would appreciate knowing if there is a cleaner solution available.

Thank you for your assistance.

/************************************************************************/
/*                             CPLCalloc()                              */
/************************************************************************/

/**
* Safe version of calloc().
*
* This function is like the C library calloc(), but raises a CE_Fatal
* error with CPLError() if it fails to allocate the desired memory.  It
* should be used for small memory allocations that are unlikely to fail
* and for which the application is unwilling to test for out of memory
* conditions.  It uses VSICalloc() to get the memory, so any hooking of
* VSICalloc() will apply to CPLCalloc() as well.  CPLFree() or VSIFree()
* can be used free memory allocated by CPLCalloc().
*
* @param nCount number of objects to allocate.
* @param nSize size (in bytes) of object to allocate.
* @return pointer to newly allocated memory, only NULL if nSize * nCount is
* NULL.
*/

Abel Pau Garcia
GIS developer
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