static inline uint32_t s_crc_generic_align()

in source/crc_sw.c [1120:1143]

• 15 lines of code
• 3 McCabe index (conditional complexity)

static inline uint32_t s_crc_generic_align(
    const uint8_t **input,
    int *length,
    uint32_t crc,
    const uint32_t *table_ptr) {

    /* Get the 4-byte memory alignment of our input buffer by looking at the least significant 2 bits*/
    size_t input_alignment = ((size_t)*input) & 0x3;

    /* Compute the number of input bytes that precede the first 4-byte aligned block (will be in range 0-3)*/
    size_t leading = (4 - input_alignment) & 0x3;

    /* Determine what's left without the leading input bytes (might be negative)*/
    size_t remaining = *length - leading;

    /* Process unaligned leading input bytes one at a time*/
    if (leading && remaining > 0) {
        crc = s_crc_generic_sb1(*input, (uint32_t)leading, crc, table_ptr);
        *input += leading;
        *length -= (int)leading;
    }

    return crc;
}