[1/4] e2fsprogs: Add memory allocation and zero-out helpers

Add functions ext2fs_get_memzero() which will malloc() the memory
using ext2fs_get_mem(), but it will zero the allocated memory afterwards
with memset().

Add function ext2fs_get_arrayzero() which will use calloc() for
allocating and zero-out the array.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
---
 lib/ext2fs/ext2fs.h |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

On Wed, 18 May 2011, Lukas Czerner wrote:

> Add functions ext2fs_get_memzero() which will malloc() the memory
> using ext2fs_get_mem(), but it will zero the allocated memory afterwards
> with memset().
> 
> Add function ext2fs_get_arrayzero() which will use calloc() for
> allocating and zero-out the array.

Sorry this is not right I forgot to commit my changes. Version 2 is out there.

Thanks!
-Lukas

> 
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>
> ---
>  lib/ext2fs/ext2fs.h |   24 ++++++++++++++++++++++++
>  1 files changed, 24 insertions(+), 0 deletions(-)
> 
> diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h
> index d3eb31d..4aff26d 100644
> --- a/lib/ext2fs/ext2fs.h
> +++ b/lib/ext2fs/ext2fs.h
> @@ -1404,6 +1404,17 @@ _INLINE_ errcode_t ext2fs_get_memalign(unsigned long size,
>  	return 0;
>  }
>  
> +_INLINE_ errcode_t ext2fs_get_memzero(unsigned long size, void *ptr)
> +{
> +	errcode_t retval;
> +
> +	retval = ext2fs_get_mem(size, ptr);
> +	if (retval)
> +		return retval;
> +	memset(ptr, 0, size);
> +	return 0;
> +}
> +
>  _INLINE_ errcode_t ext2fs_get_array(unsigned long count, unsigned long size, void *ptr)
>  {
>  	if (count && (-1UL)/count<size)
> @@ -1411,6 +1422,19 @@ _INLINE_ errcode_t ext2fs_get_array(unsigned long count, unsigned long size, voi
>  	return ext2fs_get_mem(count*size, ptr);
>  }
>  
> +_INLINE_ errcode_t ext2fs_get_arrayzero(unsigned long count, unsigned long size, void *ptr)
> +{
> +	void *pp;
> +
> +	if (count && (-1UL)/count<size)
> +		return EXT2_ET_NO_MEMORY; //maybe define EXT2_ET_OVERFLOW ?
> +	pp = calloc(count, size);
> +	if (!pp)
> +		return EXT2_ET_NO_MEMORY;
> +	memcpy(ptr, &pp, sizeof (pp));
> +	return 0;
> +}
> +
>  /*
>   * Free memory
>   */
>

On Wed, May 18, 2011 at 01:36:55PM +0200, Lukas Czerner wrote:
> This commit adds new regression test called i_e2image which should
> validate expected behaviour of e2image raw and qcow2 image creation
> and qcow2 -> raw image conversion. You can run it with "make check" as
> the rest of regression tests.
> 
> Testing is performed on three filesystem images with different block
> sizes (1024, 2048, 4096). It creates raw and qcow2 images from the
> original and then convert qcow2 image back to raw image. The results are
> checksummed and compared with pre-prepared results. All md5sums should
> stay the same and raw image created from original and qcow2 image should
> be the same as well (just for the record).
> 
> Signed-off-by: Lukas Czerner <lczerner@redhat.com>

Applied into the e2fsprogs next branch.

I had to fix up this commit so that it works when you are using a
$VPATH build directory.  Note that, temp files for tests should go in
the current directory, and that files in the source file have to be
referenced via $SRCDIR.

					- Ted
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