contrib/python-zstandard/c-ext/python-zstandard.h
author Martin von Zweigbergk <martinvonz@google.com>
Thu, 22 Jun 2017 21:45:32 -0700
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parent 31847 39d36c2db68e
child 37495 b1fb341d8a61
permissions -rw-r--r--
bundle: inline applybundle1() We have now gotten rid of all but one caller, so let's inline it there.
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/**
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* Copyright (c) 2016-present, Gregory Szorc
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* All rights reserved.
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*
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* This software may be modified and distributed under the terms
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* of the BSD license. See the LICENSE file for details.
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*/
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#define PY_SSIZE_T_CLEAN
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#include <Python.h>
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#include "structmember.h"
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#define ZSTD_STATIC_LINKING_ONLY
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#define ZDICT_STATIC_LINKING_ONLY
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#include "mem.h"
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#include "zstd.h"
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#include "zdict.h"
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#include "zstdmt_compress.h"
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#define PYTHON_ZSTANDARD_VERSION "0.8.1"
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typedef enum {
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	compressorobj_flush_finish,
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	compressorobj_flush_block,
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} CompressorObj_Flush;
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/*
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   Represents a CompressionParameters type.
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   This type is basically a wrapper around ZSTD_compressionParameters.
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*/
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typedef struct {
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	PyObject_HEAD
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	unsigned windowLog;
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	unsigned chainLog;
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	unsigned hashLog;
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	unsigned searchLog;
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	unsigned searchLength;
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	unsigned targetLength;
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	ZSTD_strategy strategy;
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} CompressionParametersObject;
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extern PyTypeObject CompressionParametersType;
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/*
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   Represents a FrameParameters type.
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   This type is basically a wrapper around ZSTD_frameParams.
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*/
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typedef struct {
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	PyObject_HEAD
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	unsigned long long frameContentSize;
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	unsigned windowSize;
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	unsigned dictID;
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	char checksumFlag;
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} FrameParametersObject;
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extern PyTypeObject FrameParametersType;
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/*
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   Represents a ZstdCompressionDict type.
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   Instances hold data used for a zstd compression dictionary.
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*/
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typedef struct {
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	PyObject_HEAD
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	/* Pointer to dictionary data. Owned by self. */
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	void* dictData;
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	/* Size of dictionary data. */
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	size_t dictSize;
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	/* k parameter for cover dictionaries. Only populated by train_cover_dict(). */
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	unsigned k;
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	/* d parameter for cover dictionaries. Only populated by train_cover_dict(). */
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	unsigned d;
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} ZstdCompressionDict;
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extern PyTypeObject ZstdCompressionDictType;
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/*
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   Represents a ZstdCompressor type.
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*/
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typedef struct {
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	PyObject_HEAD
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	/* Configured compression level. Should be always set. */
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	int compressionLevel;
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	/* Number of threads to use for operations. */
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	unsigned int threads;
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	/* Pointer to compression dictionary to use. NULL if not using dictionary
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	   compression. */
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	ZstdCompressionDict* dict;
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	/* Compression context to use. Populated during object construction. NULL
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	   if using multi-threaded compression. */
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	ZSTD_CCtx* cctx;
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	/* Multi-threaded compression context to use. Populated during object
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	   construction. NULL if not using multi-threaded compression. */
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	ZSTDMT_CCtx* mtcctx;
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	/* Digest compression dictionary. NULL initially. Populated on first use. */
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	ZSTD_CDict* cdict;
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	/* Low-level compression parameter control. NULL unless passed to
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	   constructor. Takes precedence over `compressionLevel` if defined. */
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	CompressionParametersObject* cparams;
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	/* Controls zstd frame options. */
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	ZSTD_frameParameters fparams;
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	/* Holds state for streaming compression. Shared across all invocation.
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	   Populated on first use. */
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	ZSTD_CStream* cstream;
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} ZstdCompressor;
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extern PyTypeObject ZstdCompressorType;
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typedef struct {
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	PyObject_HEAD
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	ZstdCompressor* compressor;
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	ZSTD_outBuffer output;
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	int finished;
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} ZstdCompressionObj;
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extern PyTypeObject ZstdCompressionObjType;
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typedef struct {
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	PyObject_HEAD
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	ZstdCompressor* compressor;
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	PyObject* writer;
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	Py_ssize_t sourceSize;
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	size_t outSize;
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	int entered;
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} ZstdCompressionWriter;
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extern PyTypeObject ZstdCompressionWriterType;
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typedef struct {
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	PyObject_HEAD
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	ZstdCompressor* compressor;
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	PyObject* reader;
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	Py_buffer* buffer;
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	Py_ssize_t bufferOffset;
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	Py_ssize_t sourceSize;
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	size_t inSize;
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	size_t outSize;
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	ZSTD_inBuffer input;
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	ZSTD_outBuffer output;
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	int finishedOutput;
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	int finishedInput;
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	PyObject* readResult;
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} ZstdCompressorIterator;
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extern PyTypeObject ZstdCompressorIteratorType;
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typedef struct {
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	PyObject_HEAD
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	ZSTD_DCtx* dctx;
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	ZstdCompressionDict* dict;
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	ZSTD_DDict* ddict;
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	ZSTD_DStream* dstream;
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} ZstdDecompressor;
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extern PyTypeObject ZstdDecompressorType;
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typedef struct {
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	PyObject_HEAD
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	ZstdDecompressor* decompressor;
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	int finished;
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} ZstdDecompressionObj;
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extern PyTypeObject ZstdDecompressionObjType;
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typedef struct {
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	PyObject_HEAD
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	ZstdDecompressor* decompressor;
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	PyObject* writer;
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	size_t outSize;
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	int entered;
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} ZstdDecompressionWriter;
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extern PyTypeObject ZstdDecompressionWriterType;
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typedef struct {
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	PyObject_HEAD
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	ZstdDecompressor* decompressor;
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	PyObject* reader;
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	Py_buffer* buffer;
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	Py_ssize_t bufferOffset;
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	size_t inSize;
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	size_t outSize;
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	size_t skipBytes;
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	ZSTD_inBuffer input;
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	ZSTD_outBuffer output;
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	Py_ssize_t readCount;
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	int finishedInput;
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	int finishedOutput;
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} ZstdDecompressorIterator;
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extern PyTypeObject ZstdDecompressorIteratorType;
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typedef struct {
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	int errored;
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	PyObject* chunk;
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} DecompressorIteratorResult;
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typedef struct {
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	unsigned long long offset;
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	unsigned long long length;
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} BufferSegment;
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typedef struct {
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	PyObject_HEAD
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	PyObject* parent;
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	BufferSegment* segments;
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	Py_ssize_t segmentCount;
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} ZstdBufferSegments;
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extern PyTypeObject ZstdBufferSegmentsType;
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typedef struct {
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	PyObject_HEAD
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	PyObject* parent;
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	void* data;
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	Py_ssize_t dataSize;
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	unsigned long long offset;
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} ZstdBufferSegment;
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extern PyTypeObject ZstdBufferSegmentType;
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typedef struct {
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	PyObject_HEAD
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	Py_buffer parent;
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	void* data;
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	unsigned long long dataSize;
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	BufferSegment* segments;
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	Py_ssize_t segmentCount;
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	int useFree;
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} ZstdBufferWithSegments;
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extern PyTypeObject ZstdBufferWithSegmentsType;
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/**
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 * An ordered collection of BufferWithSegments exposed as a squashed collection.
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 *
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 * This type provides a virtual view spanning multiple BufferWithSegments
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 * instances. It allows multiple instances to be "chained" together and
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 * exposed as a single collection. e.g. if there are 2 buffers holding
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 * 10 segments each, then o[14] will access the 5th segment in the 2nd buffer.
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 */
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typedef struct {
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	PyObject_HEAD
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	/* An array of buffers that should be exposed through this instance. */
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	ZstdBufferWithSegments** buffers;
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	/* Number of elements in buffers array. */
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	Py_ssize_t bufferCount;
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	/* Array of first offset in each buffer instance. 0th entry corresponds
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	   to number of elements in the 0th buffer. 1st entry corresponds to the
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	   sum of elements in 0th and 1st buffers. */
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	Py_ssize_t* firstElements;
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} ZstdBufferWithSegmentsCollection;
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extern PyTypeObject ZstdBufferWithSegmentsCollectionType;
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void ztopy_compression_parameters(CompressionParametersObject* params, ZSTD_compressionParameters* zparams);
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CompressionParametersObject* get_compression_parameters(PyObject* self, PyObject* args);
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FrameParametersObject* get_frame_parameters(PyObject* self, PyObject* args);
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PyObject* estimate_compression_context_size(PyObject* self, PyObject* args);
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int init_cstream(ZstdCompressor* compressor, unsigned long long sourceSize);
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int init_mtcstream(ZstdCompressor* compressor, Py_ssize_t sourceSize);
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int init_dstream(ZstdDecompressor* decompressor);
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ZstdCompressionDict* train_dictionary(PyObject* self, PyObject* args, PyObject* kwargs);
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ZstdCompressionDict* train_cover_dictionary(PyObject* self, PyObject* args, PyObject* kwargs);
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ZstdBufferWithSegments* BufferWithSegments_FromMemory(void* data, unsigned long long dataSize, BufferSegment* segments, Py_ssize_t segmentsSize);
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Py_ssize_t BufferWithSegmentsCollection_length(ZstdBufferWithSegmentsCollection*);
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int cpu_count(void);
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size_t roundpow2(size_t);