278 lines
9.2 KiB
C
278 lines
9.2 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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* Copyright (c) 2014-2017 Paul Sokolovsky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include "py/objstr.h"
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#include "py/objstringio.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#if MICROPY_PY_IO
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#if MICROPY_CPYTHON_COMPAT
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STATIC void check_stringio_is_open(const mp_obj_stringio_t *o) {
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if (o->vstr == NULL) {
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mp_raise_ValueError("I/O operation on closed file");
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}
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}
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#else
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#define check_stringio_is_open(o)
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#endif
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STATIC void stringio_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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(void)kind;
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mp_obj_stringio_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, self->base.type == &mp_type_stringio ? "<io.StringIO 0x%x>" : "<io.BytesIO 0x%x>", self);
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}
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STATIC mp_uint_t stringio_read(mp_obj_t o_in, void *buf, mp_uint_t size, int *errcode) {
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(void)errcode;
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mp_obj_stringio_t *o = MP_OBJ_TO_PTR(o_in);
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check_stringio_is_open(o);
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if (o->vstr->len <= o->pos) { // read to EOF, or seeked to EOF or beyond
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return 0;
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}
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mp_uint_t remaining = o->vstr->len - o->pos;
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if (size > remaining) {
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size = remaining;
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}
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memcpy(buf, o->vstr->buf + o->pos, size);
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o->pos += size;
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return size;
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}
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STATIC void stringio_copy_on_write(mp_obj_stringio_t *o) {
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const void *buf = o->vstr->buf;
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o->vstr->buf = m_new(char, o->vstr->len);
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memcpy(o->vstr->buf, buf, o->vstr->len);
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o->vstr->fixed_buf = false;
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o->ref_obj = MP_OBJ_NULL;
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}
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STATIC mp_uint_t stringio_write(mp_obj_t o_in, const void *buf, mp_uint_t size, int *errcode) {
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(void)errcode;
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mp_obj_stringio_t *o = MP_OBJ_TO_PTR(o_in);
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check_stringio_is_open(o);
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if (o->vstr->fixed_buf) {
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stringio_copy_on_write(o);
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}
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mp_uint_t new_pos = o->pos + size;
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if (new_pos < size) {
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// Writing <size> bytes will overflow o->pos beyond limit of mp_uint_t.
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*errcode = MP_EFBIG;
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return MP_STREAM_ERROR;
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}
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mp_uint_t org_len = o->vstr->len;
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if (new_pos > o->vstr->alloc) {
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// Take all what's already allocated...
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o->vstr->len = o->vstr->alloc;
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// ... and add more
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vstr_add_len(o->vstr, new_pos - o->vstr->alloc);
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}
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// If there was a seek past EOF, clear the hole
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if (o->pos > org_len) {
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memset(o->vstr->buf + org_len, 0, o->pos - org_len);
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}
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memcpy(o->vstr->buf + o->pos, buf, size);
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o->pos = new_pos;
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if (new_pos > o->vstr->len) {
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o->vstr->len = new_pos;
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}
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return size;
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}
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STATIC mp_uint_t stringio_ioctl(mp_obj_t o_in, mp_uint_t request, uintptr_t arg, int *errcode) {
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(void)errcode;
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mp_obj_stringio_t *o = MP_OBJ_TO_PTR(o_in);
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switch (request) {
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case MP_STREAM_SEEK: {
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struct mp_stream_seek_t *s = (struct mp_stream_seek_t*)arg;
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mp_uint_t ref = 0;
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switch (s->whence) {
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case MP_SEEK_CUR:
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ref = o->pos;
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break;
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case MP_SEEK_END:
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ref = o->vstr->len;
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break;
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}
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mp_uint_t new_pos = ref + s->offset;
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// For MP_SEEK_SET, offset is unsigned
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if (s->whence != MP_SEEK_SET && s->offset < 0) {
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if (new_pos > ref) {
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// Negative offset from SEEK_CUR or SEEK_END went past 0.
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// CPython sets position to 0, POSIX returns an EINVAL error
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new_pos = 0;
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}
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} else if (new_pos < ref) {
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// positive offset went beyond the limit of mp_uint_t
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*errcode = MP_EINVAL; // replace with MP_EOVERFLOW when defined
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return MP_STREAM_ERROR;
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}
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s->offset = o->pos = new_pos;
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return 0;
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}
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case MP_STREAM_FLUSH:
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return 0;
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case MP_STREAM_CLOSE:
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#if MICROPY_CPYTHON_COMPAT
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vstr_free(o->vstr);
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o->vstr = NULL;
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#else
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vstr_clear(o->vstr);
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o->vstr->alloc = 0;
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o->vstr->len = 0;
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o->pos = 0;
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#endif
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return 0;
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default:
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*errcode = MP_EINVAL;
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return MP_STREAM_ERROR;
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}
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}
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#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) {
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mp_obj_stringio_t *self = MP_OBJ_TO_PTR(self_in);
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check_stringio_is_open(self);
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// TODO: Try to avoid copying string
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return mp_obj_new_str_of_type(STREAM_TO_CONTENT_TYPE(self), (byte*)self->vstr->buf, self->vstr->len);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(stringio_getvalue_obj, stringio_getvalue);
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STATIC mp_obj_t stringio___exit__(size_t n_args, const mp_obj_t *args) {
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(void)n_args;
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return mp_stream_close(args[0]);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(stringio___exit___obj, 4, 4, stringio___exit__);
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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);
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o->base.type = type;
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o->pos = 0;
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o->ref_obj = MP_OBJ_NULL;
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return o;
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}
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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) {
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(void)n_kw; // TODO check n_kw==0
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mp_uint_t sz = 16;
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bool initdata = false;
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mp_buffer_info_t bufinfo;
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mp_obj_stringio_t *o = stringio_new(type_in);
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if (n_args > 0) {
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if (mp_obj_is_int(args[0])) {
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sz = mp_obj_get_int(args[0]);
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} else {
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mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
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if (mp_obj_is_str_or_bytes(args[0])) {
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o->vstr = m_new_obj(vstr_t);
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vstr_init_fixed_buf(o->vstr, bufinfo.len, bufinfo.buf);
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o->vstr->len = bufinfo.len;
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o->ref_obj = args[0];
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return MP_OBJ_FROM_PTR(o);
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}
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sz = bufinfo.len;
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initdata = true;
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}
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}
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o->vstr = vstr_new(sz);
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if (initdata) {
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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
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o->pos = 0;
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}
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return MP_OBJ_FROM_PTR(o);
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}
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STATIC const mp_rom_map_elem_t stringio_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
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{ MP_ROM_QSTR(MP_QSTR_write), MP_ROM_PTR(&mp_stream_write_obj) },
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{ MP_ROM_QSTR(MP_QSTR_seek), MP_ROM_PTR(&mp_stream_seek_obj) },
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{ MP_ROM_QSTR(MP_QSTR_flush), MP_ROM_PTR(&mp_stream_flush_obj) },
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{ MP_ROM_QSTR(MP_QSTR_close), MP_ROM_PTR(&mp_stream_close_obj) },
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{ MP_ROM_QSTR(MP_QSTR_getvalue), MP_ROM_PTR(&stringio_getvalue_obj) },
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{ MP_ROM_QSTR(MP_QSTR___enter__), MP_ROM_PTR(&mp_identity_obj) },
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{ MP_ROM_QSTR(MP_QSTR___exit__), MP_ROM_PTR(&stringio___exit___obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(stringio_locals_dict, stringio_locals_dict_table);
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STATIC const mp_stream_p_t stringio_stream_p = {
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.read = stringio_read,
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.write = stringio_write,
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.ioctl = stringio_ioctl,
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.is_text = true,
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};
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const mp_obj_type_t mp_type_stringio = {
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{ &mp_type_type },
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.name = MP_QSTR_StringIO,
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.print = stringio_print,
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.make_new = stringio_make_new,
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.getiter = mp_identity_getiter,
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.iternext = mp_stream_unbuffered_iter,
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.protocol = &stringio_stream_p,
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.locals_dict = (mp_obj_dict_t*)&stringio_locals_dict,
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};
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#if MICROPY_PY_IO_BYTESIO
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STATIC const mp_stream_p_t bytesio_stream_p = {
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.read = stringio_read,
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.write = stringio_write,
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.ioctl = stringio_ioctl,
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};
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const mp_obj_type_t mp_type_bytesio = {
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{ &mp_type_type },
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.name = MP_QSTR_BytesIO,
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.print = stringio_print,
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.make_new = stringio_make_new,
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.getiter = mp_identity_getiter,
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.iternext = mp_stream_unbuffered_iter,
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.protocol = &bytesio_stream_p,
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.locals_dict = (mp_obj_dict_t*)&stringio_locals_dict,
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};
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#endif
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#endif
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