c
#include <assert.h>

// Ensure B64_BLOCK is at least 2
static_assert(B64_BLOCK >= 2, "B64_BLOCK must be at least 2 to prevent out-of-bounds access.");

static inline void DecodeBase64Block(uint8_t ascii[ASCII_BLOCK], uint8_t b64[B64_BLOCK]) {
    ascii[0] = (uint8_t) (b64[0] << 2) | (b64[1] >> 4);
}
