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