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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* 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.
*/
/**
* @file parc_BufferChunker.h
* @ingroup ContentObject
* @brief A BufferChunker is a chunker that segments a PARCBuffer.
*
*/
#ifndef libparc_parc_BufferChunker_h
#define libparc_parc_BufferChunker_h
#include <parc/algol/parc_Chunker.h>
struct parc_buffer_chunker;
/**
* @typedef PARCChunker
* @brief The PARC Chunker
*/
typedef struct parc_buffer_chunker PARCBufferChunker;
/**
* The mapping of a `PARCBufferChunker` to the generic `PARCChunker`.
*/
extern PARCChunkerInterface *PARCBufferChunkerAsChunker;
/**
* Create a new chunker to segment data contained in a `PARCBuffer.`
*
* @param [in] data A `PARCBuffer` which contains the data.
* @param [in] chunkSize The size per chunk.
*
* @retval PARCChunker A newly allocated `PARCChunker`
* @retval NULL An error occurred.
*
* Example
* @code
* {
* PARCBuffer *dataToChunk = ...
* PARCChunker *chunker = ccnxChunker_CreateFromBuffer(dataToChunk, 32);
* }
*/
PARCBufferChunker *parcBufferChunker_Create(PARCBuffer *data, size_t chunkSize);
/**
* Increase the number of references to a `PARCChunker` instance.
*
* Note that new `PARCChunker` is not created,
* only that the given `PARCChunker` reference count is incremented.
* Discard the reference by invoking {@link ccnxChunker_Release}.
*
* @param [in] chunker A pointer to the original `PARCChunker`.
* @return The value of the input parameter @p chunker.
*
* Example:
* @code
* {
* PARCBufferChunker *original = parcBufferChunker_Create(...);
*
* PARCBufferChunker *reference = parcBufferChunker_Acquire(original);
*
* parcBufferChunker_Release(&original);
* parcBufferChunker_Release(&reference);
* }
* @endcode
*
* @see parcBufferChunker_Release
*/
PARCBufferChunker *parcBufferChunker_Acquire(const PARCBufferChunker *chunker);
/**
* Release a previously acquired reference to the specified instance,
* decrementing the reference count for the instance.
*
* The pointer to the instance is set to NULL as a side-effect of this function.
*
* If the invocation causes the last reference to the instance to be released,
* the instance is deallocated and the instance's implementation will perform
* additional cleanup and release other privately held references.
*
* @param [in,out] chunkerP A pointer to a pointer to the instance to release.
*
*
* Example:
* @code
* {
* ...
*
* PARCBufferChunker *chunker = parcBufferChunker_Acquire(instance);
*
* parcBufferChunker_Release(&chunker);
* }
* @endcode
*/
void parcBufferChunker_Release(PARCBufferChunker **chunkerP);
/**
* Determine if two `PARCBufferChunker` instances are equal.
*
* The following equivalence relations on non-null `PARCBufferChunker` instances are maintained:
*
* * It is reflexive: for any non-null reference value x, `parcBufferChunker_Equals(x, x)`
* must return true.
*
* * It is symmetric: for any non-null reference values x and y,
* `parcBufferChunker_Equals(x, y)` must return true if and only if
* `parcBufferChunker_Equals(y, x)` returns true.
*
* * It is transitive: for any non-null reference values x, y, and z, if
* `parcBufferChunker_Equals(x, y)` returns true and
* `parcBufferChunker_Equals(y, z)` returns true,
* then `parcBufferChunker_Equals(x, z)` must return true.
*
* * It is consistent: for any non-null reference values x and y, multiple
* invocations of `parcBufferChunker_Equals(x, y)` consistently return true or
* consistently return false.
*
* * For any non-null reference value x, `parcBufferChunker_Equals(x, NULL)` must
* return false.
*
* @param chunkerA A pointer to a `PARCBufferChunker` instance.
* @param chunkerB A pointer to a `PARCBufferChunker` instance.
* @return true if the two `PARCBufferChunker` instances are equal.
*
* Example:
* @code
* {
* PARCBuffer *dataToChunk = ...
* PARCBufferChunker *chunkerA = parcBufferChunker_Create(dataToChunk, 32);
* PARCBufferChunker *chunkerB = parcBufferChunker_Create(dataToChunk, 32);
*
* bool equals = parcBufferChunker_Equals(chunkerA, chunkerB);
* }
* @endcode
*/
bool parcBufferChunker_Equals(const PARCBufferChunker *chunkerA, const PARCBufferChunker *chunkerB);
/**
* Return an iterator to traverse the chunks of the underlying data in sequential order.
*
* This function can only be called once per chunker instance since the iterator
* will mutate internal state of the chunker.
*
* @param [in] chunker A `PARCBufferChunker` instance.
*
* @return a `PARCIterator` that traverses the chunks of the underlying data.
*
* Example
* @code
* {
* PARCBuffer *dataToChunk = ...
* PARCBufferChunker *chunker = parcBufferChunker_Create(dataToChunk, 32);
*
* PARCIterator *itr = parcBufferChunker_ForwardIterator(chunker);
*
* // use the iterator to traverse the chunker
* }
* @endcode
*/
PARCIterator *parcBufferChunker_ForwardIterator(const PARCBufferChunker *chunker);
/**
* Return an iterator to traverse the chunks of the underlying data in sequential order.
*
* This function can only be called once per chunker instance since the iterator
* will mutate internal state of the chunker.
*
* @param [in] chunker A `PARCBufferChunker` instance.
*
* @return a `PARCIterator` that traverses the chunks of the underlying data.
*
* Example
* @code
* {
* PARCBuffer *dataToChunk = ...
* PARCBufferChunker *chunker = parcBufferChunker_Create(dataToChunk, 32);
*
* PARCIterator *itr = parcBufferChunker_ReverseIterator(chunker);
*
* // use the iterator to traverse the chunker
* }
* @endcode
*/
PARCIterator *parcBufferChunker_ReverseIterator(const PARCBufferChunker *chunker);
/**
* Get the chunk size of a `PARCBufferChunker.`
*
* @param [in] chunker A `PARCBufferChunker` instance.
*
* @return the chunk size
*
* Example
* @code
* {
* PARCBuffer *dataToChunk = ...
* PARCBufferChunker *chunker = ...
*
* size_t chunkSize = parcBufferChunker_GetChunkSize(chunker);
* }
* @endcode
*/
size_t parcBufferChunker_GetChunkSize(const PARCBufferChunker *chunker);
#endif // libparc_parc_BufferChunker_h
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