add circuitpython code

1 files changed, 148 insertions, 0 deletions

diff --git a/circuitpython/py/reader.c b/circuitpython/py/reader.c
new file mode 100644
index 0000000..ecc8515
--- /dev/null
+++ b/circuitpython/py/reader.c
@@ -0,0 +1,148 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * SPDX-FileCopyrightText: 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/runtime.h"
+#include "py/mperrno.h"
+#include "py/mpthread.h"
+#include "py/reader.h"
+
+typedef struct _mp_reader_mem_t {
+    size_t free_len; // if >0 mem is freed on close by: m_free(beg, free_len)
+    const byte *beg;
+    const byte *cur;
+    const byte *end;
+} mp_reader_mem_t;
+
+STATIC mp_uint_t mp_reader_mem_readbyte(void *data) {
+    mp_reader_mem_t *reader = (mp_reader_mem_t *)data;
+    if (reader->cur < reader->end) {
+        return *reader->cur++;
+    } else {
+        return MP_READER_EOF;
+    }
+}
+
+STATIC void mp_reader_mem_close(void *data) {
+    mp_reader_mem_t *reader = (mp_reader_mem_t *)data;
+    if (reader->free_len > 0) {
+        m_del(char, (char *)reader->beg, reader->free_len);
+    }
+    m_del_obj(mp_reader_mem_t, reader);
+}
+
+void mp_reader_new_mem(mp_reader_t *reader, const byte *buf, size_t len, size_t free_len) {
+    mp_reader_mem_t *rm = m_new_obj(mp_reader_mem_t);
+    rm->free_len = free_len;
+    rm->beg = buf;
+    rm->cur = buf;
+    rm->end = buf + len;
+    reader->data = rm;
+    reader->readbyte = mp_reader_mem_readbyte;
+    reader->close = mp_reader_mem_close;
+}
+
+#if MICROPY_READER_POSIX
+
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+typedef struct _mp_reader_posix_t {
+    bool close_fd;
+    int fd;
+    size_t len;
+    size_t pos;
+    byte buf[20];
+} mp_reader_posix_t;
+
+STATIC mp_uint_t mp_reader_posix_readbyte(void *data) {
+    mp_reader_posix_t *reader = (mp_reader_posix_t *)data;
+    if (reader->pos >= reader->len) {
+        if (reader->len == 0) {
+            return MP_READER_EOF;
+        } else {
+            MP_THREAD_GIL_EXIT();
+            int n = read(reader->fd, reader->buf, sizeof(reader->buf));
+            MP_THREAD_GIL_ENTER();
+            if (n <= 0) {
+                reader->len = 0;
+                return MP_READER_EOF;
+            }
+            reader->len = n;
+            reader->pos = 0;
+        }
+    }
+    return reader->buf[reader->pos++];
+}
+
+STATIC void mp_reader_posix_close(void *data) {
+    mp_reader_posix_t *reader = (mp_reader_posix_t *)data;
+    if (reader->close_fd) {
+        MP_THREAD_GIL_EXIT();
+        close(reader->fd);
+        MP_THREAD_GIL_ENTER();
+    }
+    m_del_obj(mp_reader_posix_t, reader);
+}
+
+void mp_reader_new_file_from_fd(mp_reader_t *reader, int fd, bool close_fd) {
+    mp_reader_posix_t *rp = m_new_obj(mp_reader_posix_t);
+    rp->close_fd = close_fd;
+    rp->fd = fd;
+    MP_THREAD_GIL_EXIT();
+    int n = read(rp->fd, rp->buf, sizeof(rp->buf));
+    if (n == -1) {
+        if (close_fd) {
+            close(fd);
+        }
+        MP_THREAD_GIL_ENTER();
+        mp_raise_OSError(errno);
+    }
+    MP_THREAD_GIL_ENTER();
+    rp->len = n;
+    rp->pos = 0;
+    reader->data = rp;
+    reader->readbyte = mp_reader_posix_readbyte;
+    reader->close = mp_reader_posix_close;
+}
+
+#if !MICROPY_VFS_POSIX
+// If MICROPY_VFS_POSIX is defined then this function is provided by the VFS layer
+void mp_reader_new_file(mp_reader_t *reader, const char *filename) {
+    MP_THREAD_GIL_EXIT();
+    int fd = open(filename, O_RDONLY, 0644);
+    MP_THREAD_GIL_ENTER();
+    if (fd < 0) {
+        mp_raise_OSError(errno);
+    }
+    mp_reader_new_file_from_fd(reader, fd, true);
+}
+#endif
+
+#endif