Padding.bt

// -*- mode: c;-*-
// no macro functions
#define CALIGN16 ColumnAlign(16)
#define CALIGN12 ColumnAlign(12)
#define CALIGN8  ColumnAlign(8)
#define CALIGN4  ColumnAlign(4)

typedef struct (uint64 place) {
    local string thisName = "ColumnAlign";
    SIBE;

    local int64 size = place-(FTell() % 16);
    if( size < 0 ){
        size = 16 + size;
    }

    SIT;
    ubyte zeroes[size];
    AssertUBytesZero(
        zeroes,
        parentof(this).thisName + "->ColumnAlign"
    );
    SIEND;
} ColumnAlign;

typedef struct {
    local string thisName = "NullEater";
    SIBE;
    
    local uint64 size = 0;
    while( ReadUByte(FTell()+size) != 0 ){
        size++;
    }
    
    SIT;
    ubyte zeroes[size];
    // If this test ever fails,
    // call the cops.
    AssertUBytesZero( zeroes, "NullEater" );

    SIEND;
} NullEater;