circuitpython/py/objstringio.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
* Copyright (c) 2014 Paul Sokolovsky
*
* 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.
*/
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#include <stdio.h>
#include <string.h>
#include "py/nlr.h"
#include "py/objstr.h"
#include "py/runtime.h"
#include "py/stream.h"
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#if MICROPY_PY_IO
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typedef struct _mp_obj_stringio_t {
mp_obj_base_t base;
vstr_t *vstr;
// StringIO has single pointer used for both reading and writing
mp_uint_t pos;
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} mp_obj_stringio_t;
#if MICROPY_CPYTHON_COMPAT
STATIC void check_stringio_is_open(const mp_obj_stringio_t *o) {
if (o->vstr == NULL) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "I/O operation on closed file"));
}
}
#else
#define check_stringio_is_open(o)
#endif
STATIC void stringio_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
(void)kind;
mp_obj_stringio_t *self = MP_OBJ_TO_PTR(self_in);
mp_printf(print, self->base.type == &mp_type_stringio ? "<io.StringIO 0x%x>" : "<io.BytesIO 0x%x>", self);
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}
STATIC mp_uint_t stringio_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
(void)errcode;
mp_obj_stringio_t *o = MP_OBJ_TO_PTR(o_in);
check_stringio_is_open(o);
mp_uint_t remaining = o->vstr->len - o->pos;
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if (size > remaining) {
size = remaining;
}
memcpy(buf, o->vstr->buf + o->pos, size);
o->pos += size;
return size;
}
STATIC mp_uint_t stringio_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) {
(void)errcode;
mp_obj_stringio_t *o = MP_OBJ_TO_PTR(o_in);
check_stringio_is_open(o);
mp_int_t remaining = o->vstr->alloc - o->pos;
mp_uint_t org_len = o->vstr->len;
if ((mp_int_t)size > remaining) {
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// Take all what's already allocated...
o->vstr->len = o->vstr->alloc;
// ... and add more
vstr_add_len(o->vstr, size - remaining);
}
// If there was a seek past EOF, clear the hole
if (o->pos > org_len) {
memset(o->vstr->buf + org_len, 0, o->pos - org_len);
}
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memcpy(o->vstr->buf + o->pos, buf, size);
o->pos += size;
if (o->pos > o->vstr->len) {
o->vstr->len = o->pos;
}
return size;
}
STATIC mp_uint_t stringio_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
(void)errcode;
mp_obj_stringio_t *o = MP_OBJ_TO_PTR(o_in);
switch (request) {
case MP_STREAM_SEEK: {
struct mp_stream_seek_t *s = (struct mp_stream_seek_t*)arg;
mp_uint_t ref = 0;
switch (s->whence) {
case 1: // SEEK_CUR
ref = o->pos;
break;
case 2: // SEEK_END
ref = o->vstr->len;
break;
}
o->pos = ref + s->offset;
s->offset = o->pos;
return 0;
}
case MP_STREAM_FLUSH:
return 0;
default:
*errcode = MP_EINVAL;
return MP_STREAM_ERROR;
}
}
#define STREAM_TO_CONTENT_TYPE(o) (((o)->base.type == &mp_type_stringio) ? &mp_type_str : &mp_type_bytes)
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STATIC mp_obj_t stringio_getvalue(mp_obj_t self_in) {
mp_obj_stringio_t *self = MP_OBJ_TO_PTR(self_in);
check_stringio_is_open(self);
// TODO: Try to avoid copying string
return mp_obj_new_str_of_type(STREAM_TO_CONTENT_TYPE(self), (byte*)self->vstr->buf, self->vstr->len);
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}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(stringio_getvalue_obj, stringio_getvalue);
STATIC mp_obj_t stringio_close(mp_obj_t self_in) {
mp_obj_stringio_t *self = MP_OBJ_TO_PTR(self_in);
#if MICROPY_CPYTHON_COMPAT
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vstr_free(self->vstr);
self->vstr = NULL;
#else
vstr_clear(self->vstr);
self->vstr->alloc = 0;
self->vstr->len = 0;
self->pos = 0;
#endif
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return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(stringio_close_obj, stringio_close);
STATIC mp_obj_t stringio___exit__(size_t n_args, const mp_obj_t *args) {
(void)n_args;
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return stringio_close(args[0]);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(stringio___exit___obj, 4, 4, stringio___exit__);
STATIC mp_obj_stringio_t *stringio_new(const mp_obj_type_t *type) {
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mp_obj_stringio_t *o = m_new_obj(mp_obj_stringio_t);
o->base.type = type;
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o->vstr = vstr_new();
o->pos = 0;
return o;
}
STATIC mp_obj_t stringio_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {
(void)n_kw; // TODO check n_kw==0
mp_obj_stringio_t *o = stringio_new(type_in);
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if (n_args > 0) {
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
stringio_write(MP_OBJ_FROM_PTR(o), bufinfo.buf, bufinfo.len, NULL);
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// Cur ptr is always at the beginning of buffer at the construction
o->pos = 0;
}
return MP_OBJ_FROM_PTR(o);
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}
STATIC const mp_rom_map_elem_t stringio_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
{ MP_ROM_QSTR(MP_QSTR_seek), MP_ROM_PTR(&mp_stream_seek_obj) },
{ MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) },
{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&stringio_close_obj) },
{ MP_ROM_QSTR(MP_QSTR_getvalue), MP_ROM_PTR(&stringio_getvalue_obj) },
{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&mp_identity_obj) },
{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&stringio___exit___obj) },
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};
STATIC MP_DEFINE_CONST_DICT(stringio_locals_dict, stringio_locals_dict_table);
STATIC const mp_stream_p_t stringio_stream_p = {
.read = stringio_read,
.write = stringio_write,
.ioctl = stringio_ioctl,
.is_text = true,
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};
STATIC const mp_stream_p_t bytesio_stream_p = {
.read = stringio_read,
.write = stringio_write,
.ioctl = stringio_ioctl,
};
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const mp_obj_type_t mp_type_stringio = {
{ &mp_type_type },
.name = MP_QSTR_StringIO,
.print = stringio_print,
.make_new = stringio_make_new,
.getiter = mp_identity,
.iternext = mp_stream_unbuffered_iter,
.protocol = &stringio_stream_p,
.locals_dict = (mp_obj_dict_t*)&stringio_locals_dict,
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};
#if MICROPY_PY_IO_BYTESIO
const mp_obj_type_t mp_type_bytesio = {
{ &mp_type_type },
.name = MP_QSTR_BytesIO,
.print = stringio_print,
.make_new = stringio_make_new,
.getiter = mp_identity,
.iternext = mp_stream_unbuffered_iter,
.protocol = &bytesio_stream_p,
.locals_dict = (mp_obj_dict_t*)&stringio_locals_dict,
};
#endif
#endif