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#include <sections.h>
#include <wasm_types.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
static int check_value_type(FILE *const f)
{
varint7 value_type;
if (varint7_read(f, &value_type))
{
fprintf(stderr, "%s: varint7_read failed\n", __func__);
return -1;
}
return 0;
}
static int check_func_type(FILE *const f)
{
varint7 form;
varuint32 param_count;
if (varint7_read(f, &form))
{
fprintf(stderr, "%s: varint7_read failed\n", __func__);
return -1;
}
else if (varuint32_read(f, ¶m_count))
{
fprintf(stderr, "%s: varuint32_read failed\n", __func__);
return -1;
}
for (varuint32 i = 0; i < param_count; i++)
if (check_value_type(f))
{
fprintf(stderr, "%s: check_value_type failed\n", __func__);
return -1;
}
varuint1 return_count;
if (varuint1_read(f, &return_count))
{
fprintf(stderr, "%s: varuint1_read failed\n", __func__);
return -1;
}
else if (return_count && check_value_type(f))
{
fprintf(stderr, "%s: check_value_type 2 failed\n", __func__);
return -1;
}
return 0;
}
static int check(FILE *const f, const unsigned long len)
{
const long start = ftell(f);
varuint32 count;
if (start < 0)
{
fprintf(stderr, "%s: ftell(3): %s\n", __func__, strerror(errno));
return -1;
}
else if (varuint32_read(f, &count))
{
fprintf(stderr, "%s: varuint32_read failed\n", __func__);
return -1;
}
for (varuint32 i = 0; i < count; i++)
if (check_func_type(f))
{
fprintf(stderr, "%s: check_func_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_type(struct wasmfs *const w, FILE *const f,
const unsigned long len)
{
if (w->sections.type)
{
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.type = offset;
return 0;
}
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