wip: working on extern in VM

- Feat: add writer externs writing fns
- Feat: add VM reader functions

include/vm/fzl_vm_reader.h

@@ -0,0 +1,43 @@
+#ifndef FZL_VM_READER_H
+#define FZL_VM_READER_H
+
+#include <common/fzl_extern.h>
+#include <common/fzl_value.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+// Binary file reader descriptor
+typedef struct
+{
+  char *filepath;
+
+  fzl_value_t *consts;
+  uint16_t consts_count;
+
+  size_t *ops;
+  size_t ops_count;
+
+  char **extern_libs;
+  uint16_t extern_libs_count;
+
+  fzl_extern_type_t *extern_types;
+  uint16_t extern_types_count;
+
+  fzl_extern_fn_t *extern_fns;
+  uint16_t extern_fns_count;
+} fzl_vm_reader_t;
+
+// Allocate binary file reader
+fzl_vm_reader_t *fzl_vm_mkreader(char *filepath);
+
+// Read the file
+bool fzl_vm_read(fzl_vm_reader_t *reader);
+
+// Get last error message from the reader
+char *fzl_vm_getreadererror();
+
+// Free file reader
+void fzl_vm_freereader(fzl_vm_reader_t *reader);
+
+#endif // FZL_VM_READER_H

include/vm/internals/reader.h

@@ -0,0 +1,22 @@
+#ifndef INTERNALS_VM_READER_H
+#define INTERNALS_VM_READER_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <vm/fzl_vm_reader.h>
+
+bool vm_rd_char(FILE *fd, size_t count, char *outbuf);
+bool vm_rd_u16(FILE *fd, size_t count, uint16_t *outbuf);
+bool vm_rd_word(FILE *fd, size_t count, size_t *outbuf);
+
+bool vm_rd_header(fzl_vm_reader_t *reader, FILE *fd);
+bool vm_rd_sections_sz(fzl_vm_reader_t *reader, FILE *fd);
+bool vm_rd_consts(fzl_vm_reader_t *reader, FILE *fd);
+bool vm_rd_extern_libs(fzl_vm_reader_t *reader, FILE *fd);
+bool vm_rd_extern_types(fzl_vm_reader_t *reader, FILE *fd);
+bool vm_rd_extern_fns(fzl_vm_reader_t *reader, FILE *fd);
+bool vm_rd_ops(fzl_vm_reader_t *reader, FILE *fd);
+
+#endif // INTERNALS_VM_READER_H