[FFmpeg-devel] [PATCHv2 1/2] lavc/vorbisdec: use ptrdiff_t to iterate over intptr_t

[James Almer]

On 9/19/2022 12:35 PM, remi at remlab.net wrote:
> From: Rémi Denis-Courmont <remi at remlab.net>
> 
> While this probably never overflows, we are better safe than sorry.
> 
> The callback prototype should probably also use ptrdiff_t or size_t,
> but I diggress (this would affect the DSP callback prototype).

If you mean using ptrdiff_t instead of intptr_t, it should be pretty 
straightforward. Effectively only a prototype change and no need to 
touch the asm implementations. It would also put it in line with the 
rest of the codebase.

> ---
>   libavcodec/vorbisdec.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/libavcodec/vorbisdec.c b/libavcodec/vorbisdec.c
> index 38a5367be3..bfc4be6fc6 100644
> --- a/libavcodec/vorbisdec.c
> +++ b/libavcodec/vorbisdec.c
> @@ -1581,8 +1581,7 @@ static inline int vorbis_residue_decode(vorbis_context *vc, vorbis_residue *vr,
>   
>   void ff_vorbis_inverse_coupling(float *mag, float *ang, intptr_t blocksize)
>   {
> -    int i;
> -    for (i = 0;  i < blocksize;  i++) {
> +    for (ptrdiff_t i = 0; i < blocksize; i++) {
>           if (mag[i] > 0.0) {
>               if (ang[i] > 0.0) {
>                   ang[i] = mag[i] - ang[i];