STATIC mp_obj_t stream_readinto(size_t n_args, const mp_obj_t *args) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[1], &bufinfo, MP_BUFFER_WRITE);
// CPython extension: if 2nd arg is provided, that's max len to read,
// instead of full buffer. Similar to
// https://docs.python.org/3/library/socket.html#socket.socket.recv_into
mp_uint_t len = bufinfo.len;
if (n_args > 2) {
len = mp_obj_get_int(args[2]);
if (len > bufinfo.len) {
len = bufinfo.len;
}
}
int error;
mp_uint_t out_sz = mp_stream_read_exactly(args[0], bufinfo.buf, len, &error);
if (error != 0) {
if (mp_is_nonblocking_error(error)) {
return mp_const_none;
}
mp_raise_OSError(error);
} else {
return MP_OBJ_NEW_SMALL_INT(out_sz);
}
}
// Unbuffered, inefficient implementation of readline() for raw I/O files.
STATIC mp_obj_t stream_unbuffered_readline(size_t n_args, const mp_obj_t *args) {
const mp_stream_p_t *stream_p = mp_get_stream_raise(args[0], MP_STREAM_OP_READ);
mp_int_t max_size = -1;
if (n_args > 1) {
max_size = MP_OBJ_SMALL_INT_VALUE(args[1]);
}
vstr_t vstr;
if (max_size != -1) {
vstr_init(&vstr, max_size);
} else {
vstr_init(&vstr, 16);
}
while (max_size == -1 || max_size-- != 0) {
char *p = vstr_add_len(&vstr, 1);
if (p == NULL) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_MemoryError, "out of memory"));
}
int error;
mp_uint_t out_sz = stream_p->read(args[0], p, 1, &error);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(error)) {
if (vstr.len == 1) {
// We just incremented it, but otherwise we read nothing
// and immediately got EAGAIN. This case is not well
// specified in
// https://docs.python.org/3/library/io.html#io.IOBase.readline
// unlike similar case for read(). But we follow the latter's
// behavior - return None.
vstr_clear(&vstr);
return mp_const_none;
} else {
goto done;
}
}
mp_raise_OSError(error);
}
if (out_sz == 0) {
done:
// Back out previously added byte
// Consider, what's better - read a char and get OutOfMemory (so read
// char is lost), or allocate first as we do.
vstr_cut_tail_bytes(&vstr, 1);
break;
}
if (*p == '\n') {
break;
}
}
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(stream_p), &vstr);
}
u32_t sio_tryread(sio_fd_t fd, u8_t *data, u32_t len) {
mp_obj_type_t *type = mp_obj_get_type(MP_STATE_VM(lwip_slip_stream));
int error;
mp_uint_t out_sz = type->stream_p->read(MP_STATE_VM(lwip_slip_stream), data, len, &error);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(error)) {
return 0;
}
// Can't do much else, can we?
return 0;
}
return out_sz;
}
mp_obj_t mp_stream_write(mp_obj_t self_in, const void *buf, size_t len, byte flags) {
int error;
mp_uint_t out_sz = mp_stream_rw(self_in, (void*)buf, len, &error, flags);
if (error != 0) {
if (mp_is_nonblocking_error(error)) {
// http://docs.python.org/3/library/io.html#io.RawIOBase.write
// "None is returned if the raw stream is set not to block and
// no single byte could be readily written to it."
return mp_const_none;
}
mp_raise_OSError(error);
} else {
return MP_OBJ_NEW_SMALL_INT(out_sz);
}
}
STATIC int _mbedtls_ssl_recv(void *ctx, byte *buf, size_t len) {
mp_obj_t sock = *(mp_obj_t*)ctx;
const mp_stream_p_t *sock_stream = mp_get_stream(sock);
int err;
mp_uint_t out_sz = sock_stream->read(sock, buf, len, &err);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(err)) {
return MBEDTLS_ERR_SSL_WANT_READ;
}
return -err;
} else {
return out_sz;
}
}
STATIC mp_obj_t stream_readall(mp_obj_t self_in) {
const mp_stream_p_t *stream_p = mp_get_stream(self_in);
mp_uint_t total_size = 0;
vstr_t vstr;
vstr_init(&vstr, DEFAULT_BUFFER_SIZE);
char *p = vstr.buf;
mp_uint_t current_read = DEFAULT_BUFFER_SIZE;
while (true) {
int error;
mp_uint_t out_sz = stream_p->read(self_in, p, current_read, &error);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(error)) {
// With non-blocking streams, we read as much as we can.
// If we read nothing, return None, just like read().
// Otherwise, return data read so far.
if (total_size == 0) {
return mp_const_none;
}
break;
}
mp_raise_OSError(error);
}
if (out_sz == 0) {
break;
}
total_size += out_sz;
if (out_sz < current_read) {
current_read -= out_sz;
p += out_sz;
} else {
p = vstr_extend(&vstr, DEFAULT_BUFFER_SIZE);
current_read = DEFAULT_BUFFER_SIZE;
}
}
vstr.len = total_size;
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(stream_p), &vstr);
}
// Returns error condition in *errcode, if non-zero, return value is number of bytes written
// before error condition occured. If *errcode == 0, returns total bytes written (which will
// be equal to input size).
mp_uint_t mp_stream_rw(mp_obj_t stream, void *buf_, mp_uint_t size, int *errcode, byte flags) {
byte *buf = buf_;
mp_obj_base_t* s = (mp_obj_base_t*)MP_OBJ_TO_PTR(stream);
typedef mp_uint_t (*io_func_t)(mp_obj_t obj, void *buf, mp_uint_t size, int *errcode);
io_func_t io_func;
const mp_stream_p_t *stream_p = s->type->protocol;
if (flags & MP_STREAM_RW_WRITE) {
io_func = (io_func_t)stream_p->write;
} else {
io_func = stream_p->read;
}
*errcode = 0;
mp_uint_t done = 0;
while (size > 0) {
mp_uint_t out_sz = io_func(stream, buf, size, errcode);
// For read, out_sz == 0 means EOF. For write, it's unspecified
// what it means, but we don't make any progress, so returning
// is still the best option.
if (out_sz == 0) {
return done;
}
if (out_sz == MP_STREAM_ERROR) {
// If we read something before getting EAGAIN, don't leak it
if (mp_is_nonblocking_error(*errcode) && done != 0) {
*errcode = 0;
}
return done;
}
if (flags & MP_STREAM_RW_ONCE) {
return out_sz;
}
buf += out_sz;
size -= out_sz;
done += out_sz;
}
return done;
}
STATIC mp_obj_t stream_read_generic(size_t n_args, const mp_obj_t *args, byte flags) {
// What to do if sz < -1? Python docs don't specify this case.
// CPython does a readall, but here we silently let negatives through,
// and they will cause a MemoryError.
mp_int_t sz;
if (n_args == 1 || ((sz = mp_obj_get_int(args[1])) == -1)) {
return stream_readall(args[0]);
}
const mp_stream_p_t *stream_p = mp_get_stream(args[0]);
#if MICROPY_PY_BUILTINS_STR_UNICODE
if (stream_p->is_text) {
// We need to read sz number of unicode characters. Because we don't have any
// buffering, and because the stream API can only read bytes, we must read here
// in units of bytes and must never over read. If we want sz chars, then reading
// sz bytes will never over-read, so we follow this approach, in a loop to keep
// reading until we have exactly enough chars. This will be 1 read for text
// with ASCII-only chars, and about 2 reads for text with a couple of non-ASCII
// chars. For text with lots of non-ASCII chars, it'll be pretty inefficient
// in time and memory.
vstr_t vstr;
vstr_init(&vstr, sz);
mp_uint_t more_bytes = sz;
mp_uint_t last_buf_offset = 0;
while (more_bytes > 0) {
char *p = vstr_add_len(&vstr, more_bytes);
int error;
mp_uint_t out_sz = mp_stream_read_exactly(args[0], p, more_bytes, &error);
if (error != 0) {
vstr_cut_tail_bytes(&vstr, more_bytes);
if (mp_is_nonblocking_error(error)) {
// With non-blocking streams, we read as much as we can.
// If we read nothing, return None, just like read().
// Otherwise, return data read so far.
// TODO what if we have read only half a non-ASCII char?
if (vstr.len == 0) {
vstr_clear(&vstr);
return mp_const_none;
}
break;
}
mp_raise_OSError(error);
}
if (out_sz < more_bytes) {
// Finish reading.
// TODO what if we have read only half a non-ASCII char?
vstr_cut_tail_bytes(&vstr, more_bytes - out_sz);
if (out_sz == 0) {
break;
}
}
// count chars from bytes just read
for (mp_uint_t off = last_buf_offset;;) {
byte b = vstr.buf[off];
int n;
if (!UTF8_IS_NONASCII(b)) {
// 1-byte ASCII char
n = 1;
} else if ((b & 0xe0) == 0xc0) {
// 2-byte char
n = 2;
} else if ((b & 0xf0) == 0xe0) {
// 3-byte char
n = 3;
} else if ((b & 0xf8) == 0xf0) {
// 4-byte char
n = 4;
} else {
// TODO
n = 5;
}
if (off + n <= vstr.len) {
// got a whole char in n bytes
off += n;
sz -= 1;
last_buf_offset = off;
if (off >= vstr.len) {
more_bytes = sz;
break;
}
} else {
// didn't get a whole char, so work out how many extra bytes are needed for
// this partial char, plus bytes for additional chars that we want
more_bytes = (off + n - vstr.len) + (sz - 1);
break;
}
}
}
return mp_obj_new_str_from_vstr(&mp_type_str, &vstr);
}
#endif
vstr_t vstr;
vstr_init_len(&vstr, sz);
int error;
mp_uint_t out_sz = mp_stream_rw(args[0], vstr.buf, sz, &error, flags);
if (error != 0) {
vstr_clear(&vstr);
if (mp_is_nonblocking_error(error)) {
// https://docs.python.org/3.4/library/io.html#io.RawIOBase.read
// "If the object is in non-blocking mode and no bytes are available,
// None is returned."
// This is actually very weird, as naive truth check will treat
// this as EOF.
return mp_const_none;
}
mp_raise_OSError(error);
} else {
vstr.len = out_sz;
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(stream_p), &vstr);
}
}
