1 files changed, 88 insertions, 0 deletions
diff --git a/extmod/vfs_fat_reader.c b/extmod/vfs_fat_reader.c
new file mode 100644
index 000000000..7a00f18de
--- /dev/null
+++ b/extmod/vfs_fat_reader.c
@@ -0,0 +1,88 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013-2016 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <assert.h>
+
+#include "py/mperrno.h"
+#include "py/reader.h"
+
+#if MICROPY_READER_FATFS
+
+#include "lib/fatfs/ff.h"
+#include "extmod/vfs_fat_file.h"
+
+typedef struct _mp_reader_fatfs_t {
+    FIL fp;
+    uint16_t len;
+    uint16_t pos;
+    byte buf[20];
+} mp_reader_fatfs_t;
+
+STATIC mp_uint_t mp_reader_fatfs_readbyte(void *data) {
+    mp_reader_fatfs_t *reader = (mp_reader_fatfs_t*)data;
+    if (reader->pos >= reader->len) {
+        if (reader->len < sizeof(reader->buf)) {
+            return MP_READER_EOF;
+        } else {
+            UINT n;
+            f_read(&reader->fp, reader->buf, sizeof(reader->buf), &n);
+            if (n == 0) {
+                return MP_READER_EOF;
+            }
+            reader->len = n;
+            reader->pos = 0;
+        }
+    }
+    return reader->buf[reader->pos++];
+}
+
+STATIC void mp_reader_fatfs_close(void *data) {
+    mp_reader_fatfs_t *reader = (mp_reader_fatfs_t*)data;
+    f_close(&reader->fp);
+    m_del_obj(mp_reader_fatfs_t, reader);
+}
+
+int mp_reader_new_file(mp_reader_t *reader, const char *filename) {
+    mp_reader_fatfs_t *rf = m_new_obj_maybe(mp_reader_fatfs_t);
+    if (rf == NULL) {
+        return MP_ENOMEM;
+    }
+    FRESULT res = f_open(&rf->fp, filename, FA_READ);
+    if (res != FR_OK) {
+        return fresult_to_errno_table[res];
+    }
+    UINT n;
+    f_read(&rf->fp, rf->buf, sizeof(rf->buf), &n);
+    rf->len = n;
+    rf->pos = 0;
+    reader->data = rf;
+    reader->readbyte = mp_reader_fatfs_readbyte;
+    reader->close = mp_reader_fatfs_close;
+    return 0; // success
+}
+
+#endif