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#include <sections.h>
#include <interp.h>
#include <wasm_types.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
struct global_type
{
varint7 value_type;
varuint1 mutability;
};
static int check_global_type(FILE *const f, struct global_type *const g)
{
if (varint7_read(f, &g->value_type))
{
fprintf(stderr, "%s: varint7_read failed\n", __func__);
return -1;
}
else if (varuint1_read(f, &g->mutability))
{
fprintf(stderr, "%s: varuint1_read failed\n", __func__);
return -1;
}
return 0;
}
static int check(FILE *const f, const unsigned long len)
{
int ret = -1;
struct global_type g;
struct interp *i = NULL;
const long start = ftell(f);
const struct interp_cfg cfg =
{
.f = f
};
if (start < 0)
{
fprintf(stderr, "%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
else if (check_global_type(f, &g))
{
fprintf(stderr, "%s: check_global_type\n", __func__);
goto end;
}
else if (!(i = interp_alloc(&cfg)))
{
fprintf(stderr, "%s: interp_alloc failed\n", __func__);
goto end;
}
else if (interp_run_limited(i, &interp_initexpr_set))
{
fprintf(stderr, "%s: interp_run failed\n", __func__);
goto end;
}
const long end = ftell(f);
if (end < 0)
{
fprintf(stderr, "%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
const unsigned long size = end - start;
if (size != len)
{
fprintf(stderr, "%s: size exceeded (%lu expected, got %lu)\n",
__func__, len, size);
return -1;
}
ret = 0;
end:
interp_free(i);
return ret;
}
int section_global(struct wasmfs *const w, FILE *const f,
const unsigned long len)
{
if (w->sections.global)
{
fprintf(stderr, "%s: ignoring duplicate section\n", __func__);
return 0;
}
const long offset = ftell(f);
if (offset < 0)
{
fprintf(stderr, "%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
else if (check(f, len))
{
fprintf(stderr, "%s: check failed\n", __func__);
return -1;
}
w->sections.global = offset;
return 0;
}
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