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prevent signed int overflow in left shift ops

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force unsigned when shifting by 24.

Change-Id: Ie229d252e2e4078107cd705b09397e686a321ffd
This commit is contained in:
James Zern 2013-04-13 10:33:41 -07:00
parent 7ebdf110af
commit f4f90880a8
2 changed files with 5 additions and 5 deletions
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6
examples/cwebp.c
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@ -109,15 +109,15 @@ typedef enum {
static InputFileFormat GetImageType(FILE* in_file) {
InputFileFormat format = UNSUPPORTED;
unsigned int magic;
unsigned char buf[4];
uint32_t magic;
uint8_t buf[4];
if ((fread(&buf[0], 4, 1, in_file) != 1) ||
(fseek(in_file, 0, SEEK_SET) != 0)) {
return format;
}
magic = (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
magic = ((uint32_t)buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
if (magic == 0x89504E47U) {
format = PNG_;
} else if (magic >= 0xFFD8FF00U && magic <= 0xFFD8FFFFU) {

4
src/enc/picture.c
View File

@ -710,7 +710,7 @@ static int Import(WebPPicture* const picture,
for (y = 0; y < height; ++y) {
for (x = 0; x < width; ++x) {
const int offset = step * x + y * rgb_stride;
const uint32_t argb = (a_ptr[offset] << 24) |
const uint32_t argb = ((uint32_t)a_ptr[offset] << 24) |
(r_ptr[offset] << 16) |
(g_ptr[offset] << 8) |
(b_ptr[offset]);
@ -810,7 +810,7 @@ int WebPPictureYUVAToARGB(WebPPicture* picture) {
const uint8_t* const src = picture->a + y * picture->a_stride;
int x;
for (x = 0; x < width; ++x) {
argb_dst[x] = (argb_dst[x] & 0x00ffffffu) | (src[x] << 24);
argb_dst[x] = (argb_dst[x] & 0x00ffffffu) | ((uint32_t)src[x] << 24);
}
}
}