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py: Add mp_get_stream_raise to factor out check for stream methods.

This commit is contained in:
Damien George 2015-12-08 23:34:59 +00:00
parent f54a96d6a2
commit e84325bd1d
2 changed files with 36 additions and 40 deletions
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69
py/stream.c
View File

@ -49,12 +49,21 @@ STATIC mp_obj_t stream_readall(mp_obj_t self_in);
#define STREAM_CONTENT_TYPE(stream) (((stream)->is_text) ? &mp_type_str : &mp_type_bytes)
STATIC mp_obj_t stream_read(mp_uint_t n_args, const mp_obj_t *args) {
struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)MP_OBJ_TO_PTR(args[0]);
if (o->type->stream_p == NULL || o->type->stream_p->read == NULL) {
const mp_stream_p_t *mp_get_stream_raise(mp_obj_t self_in, int flags) {
mp_obj_base_t *o = (mp_obj_base_t*)MP_OBJ_TO_PTR(self_in);
const mp_stream_p_t *stream_p = o->type->stream_p;
if (stream_p == NULL
|| ((flags & MP_STREAM_OP_READ) && stream_p->read == NULL)
|| ((flags & MP_STREAM_OP_WRITE) && stream_p->write == NULL)
|| ((flags & MP_STREAM_OP_IOCTL) && stream_p->ioctl == NULL)) {
// CPython: io.UnsupportedOperation, OSError subclass
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "Operation not supported"));
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "stream operation not supported"));
}
return stream_p;
}
STATIC mp_obj_t stream_read(mp_uint_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);
// What to do if sz < -1? Python docs don't specify this case.
// CPython does a readall, but here we silently let negatives through,
@ -65,7 +74,7 @@ STATIC mp_obj_t stream_read(mp_uint_t n_args, const mp_obj_t *args) {
}
#if MICROPY_PY_BUILTINS_STR_UNICODE
if (o->type->stream_p->is_text) {
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
@ -85,7 +94,7 @@ STATIC mp_obj_t stream_read(mp_uint_t n_args, const mp_obj_t *args) {
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_MemoryError, "out of memory"));
}
int error;
mp_uint_t out_sz = o->type->stream_p->read(MP_OBJ_FROM_PTR(o), p, more_bytes, &error);
mp_uint_t out_sz = stream_p->read(args[0], p, more_bytes, &error);
if (out_sz == MP_STREAM_ERROR) {
vstr_cut_tail_bytes(&vstr, more_bytes);
if (mp_is_nonblocking_error(error)) {
@ -156,7 +165,7 @@ STATIC mp_obj_t stream_read(mp_uint_t n_args, const mp_obj_t *args) {
vstr_t vstr;
vstr_init_len(&vstr, sz);
int error;
mp_uint_t out_sz = o->type->stream_p->read(MP_OBJ_FROM_PTR(o), vstr.buf, sz, &error);
mp_uint_t out_sz = stream_p->read(args[0], vstr.buf, sz, &error);
if (out_sz == MP_STREAM_ERROR) {
vstr_clear(&vstr);
if (mp_is_nonblocking_error(error)) {
@ -170,19 +179,15 @@ STATIC mp_obj_t stream_read(mp_uint_t n_args, const mp_obj_t *args) {
nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(error)));
} else {
vstr.len = out_sz;
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(o->type->stream_p), &vstr);
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(stream_p), &vstr);
}
}
mp_obj_t mp_stream_write(mp_obj_t self_in, const void *buf, size_t len) {
struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)MP_OBJ_TO_PTR(self_in);
if (o->type->stream_p == NULL || o->type->stream_p->write == NULL) {
// CPython: io.UnsupportedOperation, OSError subclass
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "Operation not supported"));
}
const mp_stream_p_t *stream_p = mp_get_stream_raise(self_in, MP_STREAM_OP_WRITE);
int error;
mp_uint_t out_sz = o->type->stream_p->write(self_in, buf, len, &error);
mp_uint_t out_sz = stream_p->write(self_in, buf, len, &error);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(error)) {
// http://docs.python.org/3/library/io.html#io.RawIOBase.write
@ -210,11 +215,7 @@ STATIC mp_obj_t stream_write_method(mp_obj_t self_in, mp_obj_t arg) {
}
STATIC mp_obj_t stream_readinto(mp_uint_t n_args, const mp_obj_t *args) {
struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)MP_OBJ_TO_PTR(args[0]);
if (o->type->stream_p == NULL || o->type->stream_p->read == NULL) {
// CPython: io.UnsupportedOperation, OSError subclass
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "Operation not supported"));
}
const mp_stream_p_t *stream_p = mp_get_stream_raise(args[0], MP_STREAM_OP_READ);
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[1], &bufinfo, MP_BUFFER_WRITE);
@ -230,7 +231,7 @@ STATIC mp_obj_t stream_readinto(mp_uint_t n_args, const mp_obj_t *args) {
}
int error;
mp_uint_t out_sz = o->type->stream_p->read(MP_OBJ_FROM_PTR(o), bufinfo.buf, len, &error);
mp_uint_t out_sz = stream_p->read(args[0], bufinfo.buf, len, &error);
if (out_sz == MP_STREAM_ERROR) {
if (mp_is_nonblocking_error(error)) {
return mp_const_none;
@ -242,11 +243,7 @@ STATIC mp_obj_t stream_readinto(mp_uint_t n_args, const mp_obj_t *args) {
}
STATIC mp_obj_t stream_readall(mp_obj_t self_in) {
struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)MP_OBJ_TO_PTR(self_in);
if (o->type->stream_p == NULL || o->type->stream_p->read == NULL) {
// CPython: io.UnsupportedOperation, OSError subclass
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "Operation not supported"));
}
const mp_stream_p_t *stream_p = mp_get_stream_raise(self_in, MP_STREAM_OP_READ);
mp_uint_t total_size = 0;
vstr_t vstr;
@ -255,7 +252,7 @@ STATIC mp_obj_t stream_readall(mp_obj_t self_in) {
mp_uint_t current_read = DEFAULT_BUFFER_SIZE;
while (true) {
int error;
mp_uint_t out_sz = o->type->stream_p->read(self_in, p, current_read, &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.
@ -286,16 +283,12 @@ STATIC mp_obj_t stream_readall(mp_obj_t self_in) {
}
vstr.len = total_size;
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(o->type->stream_p), &vstr);
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(stream_p), &vstr);
}
// Unbuffered, inefficient implementation of readline() for raw I/O files.
STATIC mp_obj_t stream_unbuffered_readline(mp_uint_t n_args, const mp_obj_t *args) {
struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)MP_OBJ_TO_PTR(args[0]);
if (o->type->stream_p == NULL || o->type->stream_p->read == NULL) {
// CPython: io.UnsupportedOperation, OSError subclass
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "Operation not supported"));
}
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) {
@ -316,7 +309,7 @@ STATIC mp_obj_t stream_unbuffered_readline(mp_uint_t n_args, const mp_obj_t *arg
}
int error;
mp_uint_t out_sz = o->type->stream_p->read(MP_OBJ_FROM_PTR(o), p, 1, &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) {
@ -347,7 +340,7 @@ done:
}
}
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(o->type->stream_p), &vstr);
return mp_obj_new_str_from_vstr(STREAM_CONTENT_TYPE(stream_p), &vstr);
}
// TODO take an optional extra argument (what does it do exactly?)
@ -373,11 +366,7 @@ mp_obj_t mp_stream_unbuffered_iter(mp_obj_t self) {
}
STATIC mp_obj_t stream_seek(mp_uint_t n_args, const mp_obj_t *args) {
struct _mp_obj_base_t *o = (struct _mp_obj_base_t *)MP_OBJ_TO_PTR(args[0]);
if (o->type->stream_p == NULL || o->type->stream_p->ioctl == NULL) {
// CPython: io.UnsupportedOperation, OSError subclass
nlr_raise(mp_obj_new_exception_msg(&mp_type_OSError, "Operation not supported"));
}
const mp_stream_p_t *stream_p = mp_get_stream_raise(args[0], MP_STREAM_OP_IOCTL);
struct mp_stream_seek_t seek_s;
// TODO: Could be uint64
@ -388,7 +377,7 @@ STATIC mp_obj_t stream_seek(mp_uint_t n_args, const mp_obj_t *args) {
}
int error;
mp_uint_t res = o->type->stream_p->ioctl(MP_OBJ_FROM_PTR(o), MP_STREAM_SEEK, (mp_uint_t)(uintptr_t)&seek_s, &error);
mp_uint_t res = stream_p->ioctl(args[0], MP_STREAM_SEEK, (mp_uint_t)(uintptr_t)&seek_s, &error);
if (res == MP_STREAM_ERROR) {
nlr_raise(mp_obj_new_exception_arg1(&mp_type_OSError, MP_OBJ_NEW_SMALL_INT(error)));
}

7
py/stream.h
View File

@ -37,6 +37,13 @@ MP_DECLARE_CONST_FUN_OBJ(mp_stream_write_obj);
MP_DECLARE_CONST_FUN_OBJ(mp_stream_seek_obj);
MP_DECLARE_CONST_FUN_OBJ(mp_stream_tell_obj);
// these are for mp_get_stream_raise and can be or'd together
#define MP_STREAM_OP_READ (1)
#define MP_STREAM_OP_WRITE (2)
#define MP_STREAM_OP_IOCTL (4)
const mp_stream_p_t *mp_get_stream_raise(mp_obj_t self_in, int flags);
// Iterator which uses mp_stream_unbuffered_readline_obj
mp_obj_t mp_stream_unbuffered_iter(mp_obj_t self);