Method set_checksum

tools/comdb2ar/tar_header.cpp:84–97

}

void TarHeader::set_checksum()
// Calculate and store checksum. The method is:
//  Set the 8 checksum bytes to spaces
//  Sum the 512 bytes of the header, treating each byte as a uint.
//  Store the size in the format "000000\0 " where the 0's represent the
//  checksum as a zero padded six digit octal number.
{
    memset(m_head.h.checksum, ' ', sizeof(m_head.h.checksum));
    unsigned int sum = 0;
    for(int ii = 0; ii < sizeof(m_head.c); ii++) {
        sum += m_head.c[ii];
    }
    snprintf(m_head.h.checksum, sizeof(m_head.h.checksum) - 1, "%06o", sum);
}