1 files changed, 83 insertions, 0 deletions

diff --git a/src/file.c b/src/file.c
new file mode 100644
index 0000000..a45d59f
--- /dev/null
+++ b/src/file.c
@@ -0,0 +1,83 @@
+/*
+Copyright (c) 2021 Devine Lu Linvega
+Copyright (c) 2021 Andrew Alderwick
+Copyright (c) 2022 Bad Diode
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE.
+*/
+
+#include "posprintf.h"
+
+static File f = {0};
+static char *current_filename = "";
+
+static enum {
+    IDLE,
+    FILE_READ,
+    FILE_WRITE,
+} file_state;
+
+void
+file_reset(void) {
+    f = (File){0};
+    file_state = IDLE;
+}
+
+u16
+file_init(void *filename) {
+    file_reset();
+    current_filename = filename;
+    return 0;
+}
+
+u16
+file_read(void *dest, u16 len) {
+    if(file_state != FILE_READ) {
+        file_reset();
+        f = fs_open_file(current_filename, FS_OPEN_READ);
+        file_state = FILE_READ;
+    }
+    if (f.index == FS_NULL) {
+        return 0;
+    }
+    return fs_read(dest, len, &f);
+}
+
+u16
+file_write(void *src, u16 len, u8 flags) {
+    if(file_state != FILE_WRITE) {
+        file_reset();
+        OpenMode mode = (flags & 0x01) ? FS_OPEN_APPEND : FS_OPEN_WRITE;
+        f = fs_open_file(current_filename, mode);
+        file_state = FILE_WRITE;
+    }
+    if (f.index == FS_NULL) {
+        return 0;
+    }
+    return fs_write(src, len, &f);
+}
+
+u16
+file_stat(void *dest, u16 len) {
+    if(len < strlen(current_filename) + 7) {
+        return 0;
+    }
+    if (f.index == FS_NULL) {
+        posprintf(dest, "!!!! %s\n", current_filename);
+    } else {
+        u16 file_size = fs_file_size(&f);
+        posprintf(dest, "%04x %s\n", (unsigned int)file_size, current_filename);
+    }
+    return 0;
+}
+
+// static u16
+// file_delete(void)
+// {
+//      return unlink(current_filename);
+// }