WIP

1 files changed, 96 insertions, 0 deletions

diff --git a/src/types.c b/src/types.c
index 88c883e..56b2bc1 100644
--- a/src/types.c
+++ b/src/types.c
@@ -8,6 +8,7 @@
  */
 
 #include <nw/leb128.h>
+#include <nw/log.h>
 #include <nw/types.h>
 #include <stdio.h>
 
@@ -87,3 +88,98 @@ int varint64_read(FILE *const f, varint64 *const out)
     *out = value;
     return 0;
 }
+
+size_t get_type_size(const enum value_type type)
+{
+    static const size_t list[] =
+    {
+        [VALUE_TYPE_I32] = sizeof (int32_t),
+        [VALUE_TYPE_I64] = sizeof (int64_t),
+        [VALUE_TYPE_F32] = sizeof (float),
+        [VALUE_TYPE_F64] = sizeof (double)
+    };
+
+    return list[type];
+}
+
+enum
+{
+    I32 = 0x7f,
+    I64 = 0x7e,
+    F32 = 0x7d,
+    F64 = 0x7c,
+    ANYFUNC = 0x70,
+    FUNC = 0x60,
+    BLOCK_TYPE = 0x40
+};
+
+int get_value_type(const varint7 type, enum value_type *const vtype)
+{
+    static const struct size
+    {
+        varint7 type;
+        enum value_type vtype;
+    } sizes[] =
+    {
+        {.type = I32, .vtype = VALUE_TYPE_I32},
+        {.type = I64, .vtype = VALUE_TYPE_I64},
+        {.type = F32, .vtype = VALUE_TYPE_F32},
+        {.type = F64, .vtype = VALUE_TYPE_F64},
+        /* TODO: check this. */
+        {.type = ANYFUNC, .vtype = VALUE_TYPE_I32},
+        /* TODO: check this. */
+        {.type = FUNC, .vtype = VALUE_TYPE_I32},
+        /* TODO: check this. */
+        {.type = BLOCK_TYPE, .vtype = VALUE_TYPE_I32}
+    };
+
+    for (size_t i = 0; i < sizeof sizes / sizeof *sizes; i++)
+    {
+        const struct size *const s = &sizes[i];
+
+        if (type == s->type)
+        {
+            *vtype = s->vtype;
+            return 0;
+        }
+    }
+
+    LOG("%s: unknown type %#hhx\n", __func__, (char)type);
+    return -1;
+}
+
+static int32_t little_endian_i32(const int32_t in)
+{
+    const union
+    {
+        uint8_t a[4];
+        uint32_t b;
+    } v =
+    {
+        .b = in
+    };
+
+    return v.a[0] | (v.a[1] << 8l) | (v.a[2] << 16l) | (v.a[3] << 24l);
+}
+
+int32_t htoni32(const int32_t in)
+{
+    return little_endian_i32(in);
+}
+
+int32_t ntohi32(const int32_t in)
+{
+    return little_endian_i32(in);
+}
+
+const char *value_type_tostr(const enum value_type v)
+{
+    static const char *const s[] =
+    {
+#define X(x) [x] = #x,
+        VALUE_TYPES
+#undef X
+    };
+
+    return s[v];
+}