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// Copyright (c) 2024, Marvin Borner <dev@marvinborner.de>
// SPDX-License-Identifier: MIT
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <target.h>
#include <parse.h>
#include <log.h>
struct context {
enum { WRITE_BITS, WRITE_ASCII } type;
FILE *file;
char *byte;
int *bit;
};
static void write_context(struct context *context, const char *bits)
{
if (context->type == WRITE_ASCII) {
fprintf(context->file, "%s", bits);
return;
}
// WRITE_BITS
for (const char *p = bits; *p; p++) {
if (*context->bit > 7) { // flush byte
fwrite(context->byte, 1, 1, context->file);
*context->byte = 0;
*context->bit = 0;
}
// TODO: which endianness should be default?
if (*p & 1)
*context->byte |= 1UL << *context->bit;
(*context->bit)++;
}
}
static void write_unblc(struct term *term, struct bloc_parsed *bloc,
struct context *context)
{
switch (term->type) {
case ABS:
write_context(context, "00");
write_unblc(term->u.abs.term, bloc, context);
break;
case APP:
write_context(context, "01");
write_unblc(term->u.app.lhs, bloc, context);
write_unblc(term->u.app.rhs, bloc, context);
break;
case VAR:
for (int i = 0; i <= term->u.var.index; i++)
write_context(context, "1");
write_context(context, "0");
break;
case REF:
if (term->u.ref.index + 1 >= bloc->length)
fatal("invalid ref index %ld\n", term->u.ref.index);
write_unblc(bloc->entries[term->u.ref.index], bloc, context);
break;
default:
fatal("invalid type %d\n", term->type);
}
}
static void write_unblc_ascii(struct bloc_parsed *bloc, FILE *file)
{
struct context context = {
.type = WRITE_ASCII,
.file = file,
};
write_unblc(bloc->entries[bloc->length - 1], bloc, &context);
}
static void write_unblc_bits(struct bloc_parsed *bloc, FILE *file)
{
char byte = 0;
int bit = 0;
struct context context = {
.type = WRITE_BITS,
.file = file,
.byte = &byte,
.bit = &bit,
};
write_unblc(bloc->entries[bloc->length - 1], bloc, &context);
if (bit)
fwrite(&byte, 1, 1, file);
}
struct target_spec target_unblc = {
.name = "unblc",
.exec = write_unblc_ascii,
};
struct target_spec target_unbblc = {
.name = "unbblc",
.exec = write_unblc_bits,
};
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