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Ensure b64Cursor chars are unsigned when used as index.

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This commit is contained in:
Maarten Billemont 2020-04-14 19:11:08 -04:00
parent 9b8ff7ad0c
commit 62e1563fa6
1 changed files with 2 additions and 2 deletions
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4
platform-independent/c/core/src/base64.c
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@ -81,7 +81,7 @@ static const uint8_t b64ToBits[256] =
size_t mpw_base64_decode_max(const char *b64Text) {
register const char *b64Cursor = b64Text;
for (; b64ToBits[*b64Cursor] <= 63; ++b64Cursor);
for (; b64ToBits[(uint8_t)*b64Cursor] <= 63; ++b64Cursor);
size_t b64Size = b64Cursor - b64Text;
// Every 4 b64 chars yield 3 plain bytes => len = 3 * ceil(b64Size / 4)
@ -91,7 +91,7 @@ size_t mpw_base64_decode_max(const char *b64Text) {
size_t mpw_base64_decode(uint8_t *plainBuf, const char *b64Text) {
register const uint8_t *b64Cursor = (uint8_t *)b64Text;
for (; b64ToBits[*b64Cursor] <= 63; ++b64Cursor);
for (; b64ToBits[(uint8_t)*b64Cursor] <= 63; ++b64Cursor);
size_t b64Remaining = b64Cursor - (uint8_t *)b64Text;
b64Cursor = (uint8_t *)b64Text;