d02c1c786e
* Add build time partitions compilation * Fix wrong definition of SS pin * Add support for core debug level selection * update idf libs
60 lines
2.4 KiB
C
Executable File
60 lines
2.4 KiB
C
Executable File
/******************************************************************************
|
|
*
|
|
* Copyright (C) 2014 Google, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at:
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
******************************************************************************/
|
|
|
|
#ifndef _BUFFER_H_
|
|
#define _BUFFER_H_
|
|
|
|
#include <stdbool.h>
|
|
#include <stddef.h>
|
|
|
|
typedef struct buffer_t buffer_t;
|
|
|
|
// Returns a new buffer of |size| bytes. Returns NULL if a buffer could not be
|
|
// allocated. |size| must be non-zero. The caller must release this buffer with
|
|
// |buffer_free|.
|
|
buffer_t *buffer_new(size_t size);
|
|
|
|
// Creates a new reference to the buffer |buf|. A reference is indistinguishable
|
|
// from the original: writes to the original will be reflected in the reference
|
|
// and vice versa. In other words, this function creates an alias to |buf|. The
|
|
// caller must release the returned buffer with |buffer_free|. Note that releasing
|
|
// the returned buffer does not release |buf|. |buf| must not be NULL.
|
|
buffer_t *buffer_new_ref(const buffer_t *buf);
|
|
|
|
// Creates a new reference to the last |slice_size| bytes of |buf|. See
|
|
// |buffer_new_ref| for a description of references. |slice_size| must be
|
|
// greater than 0 and may be at most |buffer_length|
|
|
// (0 < slice_size <= buffer_length). |buf| must not be NULL.
|
|
buffer_t *buffer_new_slice(const buffer_t *buf, size_t slice_size);
|
|
|
|
// Frees a buffer object. |buf| may be NULL.
|
|
void buffer_free(buffer_t *buf);
|
|
|
|
// Returns a pointer to a writeable memory region for |buf|. All references
|
|
// and slices that share overlapping bytes will also be written to when
|
|
// writing to the returned pointer. The caller may safely write up to
|
|
// |buffer_length| consecutive bytes starting at the address returned by
|
|
// this function. |buf| must not be NULL.
|
|
void *buffer_ptr(const buffer_t *buf);
|
|
|
|
// Returns the length of the writeable memory region referred to by |buf|.
|
|
// |buf| must not be NULL.
|
|
size_t buffer_length(const buffer_t *buf);
|
|
|
|
#endif /*_BUFFER_H_*/
|