try to get mdata from .fimg file

floatimg.h

@@ -4,7 +4,7 @@
  *	http://la.buvette.org/photos/cumul
  */
 
-#define		FIMG_VERSION	176
+#define		FIMG_VERSION	177
 
 /*
  *	in memory descriptor

lib/metadata.c

@@ -38,6 +38,61 @@ pmd->count    = 0;
 pmd->fval     = 255.0;
 strcpy(pmd->idcam, "<unknow>");
 pmd->origin   = 999;
+
 return -1;
 }
 /* ---------------------------------------------------------------- */
+int fimg_get_metadata_from_file(char *fname, FimgMetaData *pmd)
+{
+FILE			*fp;
+FimgFileHead		filehead;
+FimgMetaData		metadata;
+int			foo;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( %s %p )\n", __func__, fname, pmd);
+#endif
+
+if (NULL==(fp=fopen(fname, "r"))) {
+	return -1;
+	}
+
+foo = fread(&filehead, sizeof(FimgFileHead), 1, fp);
+if (sizeof(FimgFileHead) != foo) {
+	fprintf(stderr, "short read on %s (head)\n", fname);
+	fclose(fp);
+	return -2;
+	}
+
+if (memcmp(filehead.magic, "FIMG", 4)) {
+	fprintf(stderr, "'%s' is not a fimg file.\n", fname);
+	fclose(fp);
+	return -3;
+	}
+
+if ('a' != filehead.magic[4]) {
+	fprintf(stderr, "'%s' have no metadata.\n", fname);
+	fclose(fp);
+	return -4;
+	}
+
+foo = fread(&metadata, sizeof(FimgMetaData), 1, fp);
+if (sizeof(FimgMetaData) != foo) {
+	fprintf(stderr, "short read on %s (metadata)\n", fname);
+	fclose(fp);
+	return -5;
+	}
+
+fclose(fp);		/* got all needed datas */
+
+if (memcmp(metadata.magic, "metadata", 8)) {
+	fprintf(stderr, "'%s' invalid metadata.\n", fname);
+	fclose(fp);
+	return -6;
+	}
+
+memcpy(pmd, &metadata, sizeof(FimgMetaData));
+
+return 0;
+}
+/* ---------------------------------------------------------------- */