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#include <sections.h>
#include <wasm_types.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
static int check_table_type(FILE *const f)
{
enum {ANYFUNC = 0x70};
varint7 elem_type;
if (varint7_read(f, &elem_type))
{
fprintf(stderr, "%s: varint7_read failed\n", __func__);
return -1;
}
else if (elem_type != ANYFUNC)
{
fprintf(stderr, "%s: expected %x, got %x", __func__, ANYFUNC,
(int)elem_type);
return -1;
}
return check_resizable_limits(f);
}
static int check(FILE *const f, const unsigned long len)
{
const long start = ftell(f);
if (start < 0)
{
fprintf(stderr, "%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
varuint32 count;
if (varuint32_read(f, &count))
{
fprintf(stderr, "%s: varuint32_read failed\n", __func__);
return -1;
}
for (varuint32 i = 0; i < count; i++)
if (check_table_type(f))
{
fprintf(stderr, "%s: check_table_type failed\n", __func__);
return -1;
}
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;
}
return 0;
}
int section_table(struct wasmfs *const w, FILE *const f,
const unsigned long len)
{
if (w->sections.table)
{
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.table = offset;
return 0;
}
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