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utils.h: add SizeOverflow()

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this normalizes the 'size != (size_t)size' checks in the libraries.

Change-Id: I1e8ccd0d3697266f23911ecf0f7a546f011befde
This commit is contained in:
James Zern
2021-06-14 12:20:35 -07:00
parent 695bdaa2f6
commit 28d488e6f1
6 changed files with 13 additions and 9 deletions
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4
src/demux/anim_decode.c
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@ -153,7 +153,7 @@ static int ZeroFillCanvas(uint8_t* buf, uint32_t canvas_width,
uint32_t canvas_height) {
const uint64_t size =
(uint64_t)canvas_width * canvas_height * NUM_CHANNELS * sizeof(*buf);
if (size != (size_t)size) return 0;
if (!CheckSizeOverflow(size)) return 0;
memset(buf, 0, (size_t)size);
return 1;
}
@ -174,7 +174,7 @@ static void ZeroFillFrameRect(uint8_t* buf, int buf_stride, int x_offset,
static int CopyCanvas(const uint8_t* src, uint8_t* dst,
uint32_t width, uint32_t height) {
const uint64_t size = (uint64_t)width * height * NUM_CHANNELS;
if (size != (size_t)size) return 0;
if (!CheckSizeOverflow(size)) return 0;
assert(src != NULL && dst != NULL);
memcpy(dst, src, (size_t)size);
return 1;