Enable mg_fopen_packed in newlib

src/fs.c

@@ -26,13 +26,13 @@ ssize_t packed_write(void *cookie, const char *buf, size_t size) {
   return -1;
 }
 
-int packed_seek(void *cookie, off64_t *offset, int whence) {
+int packed_seek(void *cookie, long *offset, int whence) {
   struct packed_file *fp = (struct packed_file *) cookie;
   if (whence == SEEK_SET) fp->pos = (size_t) *offset;
-  if (whence == SEEK_END) fp->pos = (size_t)((off64_t) fp->size + *offset);
-  if (whence == SEEK_CUR) fp->pos = (size_t)((off64_t) fp->pos + *offset);
+  if (whence == SEEK_END) fp->pos = (size_t)((long) fp->size + *offset);
+  if (whence == SEEK_CUR) fp->pos = (size_t)((long) fp->pos + *offset);
   if (fp->pos > fp->size) fp->pos = fp->size;
-  *offset = (off64_t) fp->pos;
+  *offset = (long) fp->pos;
   return 0;
 }
 
@@ -50,7 +50,7 @@ FILE *mg_fopen_packed(const char *path, const char *mode) {
   };
   struct packed_file *cookie = NULL;
   size_t size = 0;
-  const char *data = unpack(path, &size);
+  const char *data = mg_unpack(path, &size);
   if (data == NULL) return NULL;
   if ((cookie = calloc(1, sizeof(*cookie))) == NULL) return NULL;
   cookie->data = data;

src/fs.h

@@ -4,7 +4,7 @@
 
 FILE *mg_fopen_packed(const char *path, const char *mode);
 
-#if defined(__linux__) && defined(GCC)
+#if (defined(__linux__) && defined(__GNUC__)) || defined(__NEWLIB__)
 #define MG_ENABLE_PACKED_FS 1
 #define MG_FOPENCOOKIE
 #else