/* SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause */
/*
* Copyright ( c ) Meta Platforms , Inc . and affiliates .
* All rights reserved .
*
* This source code is licensed under both the BSD - style license ( found in the
* LICENSE file in the root directory of https : //github.com/facebook/zstd) and
* the GPLv2 ( found in the COPYING file in the root directory of
* https : //github.com/facebook/zstd). You may select, at your option, one of the
* above - listed licenses .
*/
#ifndef LINUX_ZSTD_H
#define LINUX_ZSTD_H
/**
* This is a kernel - style API that wraps the upstream zstd API , which cannot be
* used directly because the symbols aren ' t exported . It exposes the minimal
* functionality which is currently required by users of zstd in the kernel .
* Expose extra functions from lib / zstd / zstd . h as needed .
*/
/* ====== Dependency ====== */
#include <linux/types.h>
#include <linux/zstd_errors.h>
#include <linux/zstd_lib.h>
/* ====== Helper Functions ====== */
/**
* zstd_compress_bound ( ) - maximum compressed size in worst case scenario
* @ src_size : The size of the data to compress .
*
* Return : The maximum compressed size in the worst case scenario .
*/
size_t zstd_compress_bound(size_t src_size);
/**
* zstd_is_error ( ) - tells if a size_t function result is an error code
* @ code : The function result to check for error .
*
* Return : Non - zero iff the code is an error .
*/
unsigned int zstd_is_error(size_t code);
/**
* enum zstd_error_code - zstd error codes
*/
typedef ZSTD_ErrorCode zstd_error_code;
/**
* zstd_get_error_code ( ) - translates an error function result to an error code
* @ code : The function result for which zstd_is_error ( code ) is true .
*
* Return : A unique error code for this error .
*/
zstd_error_code zstd_get_error_code(size_t code);
/**
* zstd_get_error_name ( ) - translates an error function result to a string
* @ code : The function result for which zstd_is_error ( code ) is true .
*
* Return : An error string corresponding to the error code .
*/
const char *zstd_get_error_name(size_t code);
/**
* zstd_min_clevel ( ) - minimum allowed compression level
*
* Return : The minimum allowed compression level .
*/
int zstd_min_clevel(void );
/**
* zstd_max_clevel ( ) - maximum allowed compression level
*
* Return : The maximum allowed compression level .
*/
int zstd_max_clevel(void );
/**
* zstd_default_clevel ( ) - default compression level
*
* Return : Default compression level .
*/
int zstd_default_clevel(void );
/**
* struct zstd_custom_mem - custom memory allocation
*/
typedef ZSTD_customMem zstd_custom_mem;
/**
* struct zstd_dict_load_method - Dictionary load method .
* See zstd_lib . h .
*/
typedef ZSTD_dictLoadMethod_e zstd_dict_load_method;
/**
* struct zstd_dict_content_type - Dictionary context type .
* See zstd_lib . h .
*/
typedef ZSTD_dictContentType_e zstd_dict_content_type;
/* ====== Parameter Selection ====== */
/**
* enum zstd_strategy - zstd compression search strategy
*
* From faster to stronger . See zstd_lib . h .
*/
typedef ZSTD_strategy zstd_strategy;
/**
* struct zstd_compression_parameters - zstd compression parameters
* @ windowLog : Log of the largest match distance . Larger means more
* compression , and more memory needed during decompression .
* @ chainLog : Fully searched segment . Larger means more compression ,
* slower , and more memory ( useless for fast ) .
* @ hashLog : Dispatch table . Larger means more compression ,
* slower , and more memory .
* @ searchLog : Number of searches . Larger means more compression and slower .
* @ searchLength : Match length searched . Larger means faster decompression ,
* sometimes less compression .
* @ targetLength : Acceptable match size for optimal parser ( only ) . Larger means
* more compression , and slower .
* @ strategy : The zstd compression strategy .
*
* See zstd_lib . h .
*/
typedef ZSTD_compressionParameters zstd_compression_parameters;
/**
* struct zstd_frame_parameters - zstd frame parameters
* @ contentSizeFlag : Controls whether content size will be present in the
* frame header ( when known ) .
* @ checksumFlag : Controls whether a 32 - bit checksum is generated at the
* end of the frame for error detection .
* @ noDictIDFlag : Controls whether dictID will be saved into the frame
* header when using dictionary compression .
*
* The default value is all fields set to 0 . See zstd_lib . h .
*/
typedef ZSTD_frameParameters zstd_frame_parameters;
/**
* struct zstd_parameters - zstd parameters
* @ cParams : The compression parameters .
* @ fParams : The frame parameters .
*/
typedef ZSTD_parameters zstd_parameters;
/**
* zstd_get_params ( ) - returns zstd_parameters for selected level
* @ level : The compression level
* @ estimated_src_size : The estimated source size to compress or 0
* if unknown .
*
* Return : The selected zstd_parameters .
*/
zstd_parameters zstd_get_params(int level,
unsigned long long estimated_src_size);
/**
* zstd_get_cparams ( ) - returns zstd_compression_parameters for selected level
* @ level : The compression level
* @ estimated_src_size : The estimated source size to compress or 0
* if unknown .
* @ dict_size : Dictionary size .
*
* Return : The selected zstd_compression_parameters .
*/
zstd_compression_parameters zstd_get_cparams(int level,
unsigned long long estimated_src_size, size_t dict_size);
typedef ZSTD_CCtx zstd_cctx;
typedef ZSTD_cParameter zstd_cparameter;
/**
* zstd_cctx_set_param ( ) - sets a compression parameter
* @ cctx : The context . Must have been initialized with zstd_init_cctx ( ) .
* @ param : The parameter to set .
* @ value : The value to set the parameter to .
*
* Return : Zero or an error , which can be checked using zstd_is_error ( ) .
*/
size_t zstd_cctx_set_param(zstd_cctx *cctx, zstd_cparameter param, int value);
/* ====== Single-pass Compression ====== */
/**
* zstd_cctx_workspace_bound ( ) - max memory needed to initialize a zstd_cctx
* @ parameters : The compression parameters to be used .
*
* If multiple compression parameters might be used , the caller must call
* zstd_cctx_workspace_bound ( ) for each set of parameters and use the maximum
* size .
*
* Return : A lower bound on the size of the workspace that is passed to
* zstd_init_cctx ( ) .
*/
size_t zstd_cctx_workspace_bound(const zstd_compression_parameters *parameters);
/**
* zstd_cctx_workspace_bound_with_ext_seq_prod ( ) - max memory needed to
* initialize a zstd_cctx when using the block - level external sequence
* producer API .
* @ parameters : The compression parameters to be used .
*
* If multiple compression parameters might be used , the caller must call
* this function for each set of parameters and use the maximum size .
*
* Return : A lower bound on the size of the workspace that is passed to
* zstd_init_cctx ( ) .
*/
size_t zstd_cctx_workspace_bound_with_ext_seq_prod(const zstd_compression_parameters *parameters);
/**
* zstd_init_cctx ( ) - initialize a zstd compression context
* @ workspace : The workspace to emplace the context into . It must outlive
* the returned context .
* @ workspace_size : The size of workspace . Use zstd_cctx_workspace_bound ( ) to
* determine how large the workspace must be .
*
* Return : A zstd compression context or NULL on error .
*/
zstd_cctx *zstd_init_cctx(void *workspace, size_t workspace_size);
/**
* zstd_compress_cctx ( ) - compress src into dst with the initialized parameters
* @ cctx : The context . Must have been initialized with zstd_init_cctx ( ) .
* @ dst : The buffer to compress src into .
* @ dst_capacity : The size of the destination buffer . May be any size , but
* ZSTD_compressBound ( srcSize ) is guaranteed to be large enough .
* @ src : The data to compress .
* @ src_size : The size of the data to compress .
* @ parameters : The compression parameters to be used .
*
* Return : The compressed size or an error , which can be checked using
* zstd_is_error ( ) .
*/
size_t zstd_compress_cctx(zstd_cctx *cctx, void *dst, size_t dst_capacity,
const void *src, size_t src_size, const zstd_parameters *parameters);
/**
* zstd_create_cctx_advanced ( ) - Create compression context
* @ custom_mem : Custom allocator .
*
* Return : NULL on error , pointer to compression context otherwise .
*/
zstd_cctx *zstd_create_cctx_advanced(zstd_custom_mem custom_mem);
/**
* zstd_free_cctx ( ) - Free compression context
* @ cdict : Pointer to compression context .
*
* Return : Always 0 .
*/
size_t zstd_free_cctx(zstd_cctx* cctx);
/**
* struct zstd_cdict - Compression dictionary .
* See zstd_lib . h .
*/
typedef ZSTD_CDict zstd_cdict;
/**
* zstd_create_cdict_byreference ( ) - Create compression dictionary
* @ dict : Pointer to dictionary buffer .
* @ dict_size : Size of the dictionary buffer .
* @ dict_load_method : Dictionary load method .
* @ dict_content_type : Dictionary content type .
* @ custom_mem : Memory allocator .
*
* Note , this uses @ dict by reference ( ZSTD_dlm_byRef ) , so it should be
* free before zstd_cdict is destroyed .
*
* Return : NULL on error , pointer to compression dictionary
* otherwise .
*/
zstd_cdict *zstd_create_cdict_byreference(const void *dict, size_t dict_size,
zstd_compression_parameters cparams,
zstd_custom_mem custom_mem);
/**
* zstd_free_cdict ( ) - Free compression dictionary
* @ cdict : Pointer to compression dictionary .
*
* Return : Always 0 .
*/
size_t zstd_free_cdict(zstd_cdict* cdict);
/**
* zstd_compress_using_cdict ( ) - compress src into dst using a dictionary
* @ cctx : The context . Must have been initialized with zstd_init_cctx ( ) .
* @ dst : The buffer to compress src into .
* @ dst_capacity : The size of the destination buffer . May be any size , but
* ZSTD_compressBound ( srcSize ) is guaranteed to be large enough .
* @ src : The data to compress .
* @ src_size : The size of the data to compress .
* @ cdict : The dictionary to be used .
*
* Return : The compressed size or an error , which can be checked using
* zstd_is_error ( ) .
*/
size_t zstd_compress_using_cdict(zstd_cctx *cctx, void *dst,
size_t dst_capacity, const void *src, size_t src_size,
const zstd_cdict *cdict);
/* ====== Single-pass Decompression ====== */
typedef ZSTD_DCtx zstd_dctx;
/**
* zstd_dctx_workspace_bound ( ) - max memory needed to initialize a zstd_dctx
*
* Return : A lower bound on the size of the workspace that is passed to
* zstd_init_dctx ( ) .
*/
size_t zstd_dctx_workspace_bound(void );
/**
* zstd_init_dctx ( ) - initialize a zstd decompression context
* @ workspace : The workspace to emplace the context into . It must outlive
* the returned context .
* @ workspace_size : The size of workspace . Use zstd_dctx_workspace_bound ( ) to
* determine how large the workspace must be .
*
* Return : A zstd decompression context or NULL on error .
*/
zstd_dctx *zstd_init_dctx(void *workspace, size_t workspace_size);
/**
* zstd_decompress_dctx ( ) - decompress zstd compressed src into dst
* @ dctx : The decompression context .
* @ dst : The buffer to decompress src into .
* @ dst_capacity : The size of the destination buffer . Must be at least as large
* as the decompressed size . If the caller cannot upper bound the
* decompressed size , then it ' s better to use the streaming API .
* @ src : The zstd compressed data to decompress . Multiple concatenated
* frames and skippable frames are allowed .
* @ src_size : The exact size of the data to decompress .
*
* Return : The decompressed size or an error , which can be checked using
* zstd_is_error ( ) .
*/
size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
const void *src, size_t src_size);
/**
* struct zstd_ddict - Decompression dictionary .
* See zstd_lib . h .
*/
typedef ZSTD_DDict zstd_ddict;
/**
* zstd_create_ddict_byreference ( ) - Create decompression dictionary
* @ dict : Pointer to dictionary buffer .
* @ dict_size : Size of the dictionary buffer .
* @ dict_load_method : Dictionary load method .
* @ dict_content_type : Dictionary content type .
* @ custom_mem : Memory allocator .
*
* Note , this uses @ dict by reference ( ZSTD_dlm_byRef ) , so it should be
* free before zstd_ddict is destroyed .
*
* Return : NULL on error , pointer to decompression dictionary
* otherwise .
*/
zstd_ddict *zstd_create_ddict_byreference(const void *dict, size_t dict_size,
zstd_custom_mem custom_mem);
/**
* zstd_free_ddict ( ) - Free decompression dictionary
* @ dict : Pointer to the dictionary .
*
* Return : Always 0 .
*/
size_t zstd_free_ddict(zstd_ddict *ddict);
/**
* zstd_create_dctx_advanced ( ) - Create decompression context
* @ custom_mem : Custom allocator .
*
* Return : NULL on error , pointer to decompression context otherwise .
*/
zstd_dctx *zstd_create_dctx_advanced(zstd_custom_mem custom_mem);
/**
* zstd_free_dctx ( ) - - Free decompression context
* @ dctx : Pointer to decompression context .
* Return : Always 0 .
*/
size_t zstd_free_dctx(zstd_dctx *dctx);
/**
* zstd_decompress_using_ddict ( ) - decompress src into dst using a dictionary
* @ dctx : The decompression context .
* @ dst : The buffer to decompress src into .
* @ dst_capacity : The size of the destination buffer . Must be at least as large
* as the decompressed size . If the caller cannot upper bound the
* decompressed size , then it ' s better to use the streaming API .
* @ src : The zstd compressed data to decompress . Multiple concatenated
* frames and skippable frames are allowed .
* @ src_size : The exact size of the data to decompress .
* @ ddict : The dictionary to be used .
*
* Return : The decompressed size or an error , which can be checked using
* zstd_is_error ( ) .
*/
size_t zstd_decompress_using_ddict(zstd_dctx *dctx,
void *dst, size_t dst_capacity, const void *src, size_t src_size,
const zstd_ddict *ddict);
/* ====== Streaming Buffers ====== */
/**
* struct zstd_in_buffer - input buffer for streaming
* @ src : Start of the input buffer .
* @ size : Size of the input buffer .
* @ pos : Position where reading stopped . Will be updated .
* Necessarily 0 < = pos < = size .
*
* See zstd_lib . h .
*/
typedef ZSTD_inBuffer zstd_in_buffer;
/**
* struct zstd_out_buffer - output buffer for streaming
* @ dst : Start of the output buffer .
* @ size : Size of the output buffer .
* @ pos : Position where writing stopped . Will be updated .
* Necessarily 0 < = pos < = size .
*
* See zstd_lib . h .
*/
typedef ZSTD_outBuffer zstd_out_buffer;
/* ====== Streaming Compression ====== */
typedef ZSTD_CStream zstd_cstream;
/**
* zstd_cstream_workspace_bound ( ) - memory needed to initialize a zstd_cstream
* @ cparams : The compression parameters to be used for compression .
*
* Return : A lower bound on the size of the workspace that is passed to
* zstd_init_cstream ( ) .
*/
size_t zstd_cstream_workspace_bound(const zstd_compression_parameters *cparams);
/**
* zstd_cstream_workspace_bound_with_ext_seq_prod ( ) - memory needed to initialize
* a zstd_cstream when using the block - level external sequence producer API .
* @ cparams : The compression parameters to be used for compression .
*
* Return : A lower bound on the size of the workspace that is passed to
* zstd_init_cstream ( ) .
*/
size_t zstd_cstream_workspace_bound_with_ext_seq_prod(const zstd_compression_parameters *cparams);
/**
* zstd_init_cstream ( ) - initialize a zstd streaming compression context
* @ parameters The zstd parameters to use for compression .
* @ pledged_src_size : If params . fParams . contentSizeFlag = = 1 then the caller
* must pass the source size ( zero means empty source ) .
* Otherwise , the caller may optionally pass the source
* size , or zero if unknown .
* @ workspace : The workspace to emplace the context into . It must outlive
* the returned context .
* @ workspace_size : The size of workspace .
* Use zstd_cstream_workspace_bound ( params - > cparams ) to
* determine how large the workspace must be .
*
* Return : The zstd streaming compression context or NULL on error .
*/
zstd_cstream *zstd_init_cstream(const zstd_parameters *parameters,
unsigned long long pledged_src_size, void *workspace, size_t workspace_size);
/**
* zstd_reset_cstream ( ) - reset the context using parameters from creation
* @ cstream : The zstd streaming compression context to reset .
* @ pledged_src_size : Optionally the source size , or zero if unknown .
*
* Resets the context using the parameters from creation . Skips dictionary
* loading , since it can be reused . If ` pledged_src_size ` is non - zero the frame
* content size is always written into the frame header .
*
* Return : Zero or an error , which can be checked using
* zstd_is_error ( ) .
*/
size_t zstd_reset_cstream(zstd_cstream *cstream,
unsigned long long pledged_src_size);
/**
* zstd_compress_stream ( ) - streaming compress some of input into output
* @ cstream : The zstd streaming compression context .
* @ output : Destination buffer . ` output - > pos ` is updated to indicate how much
* compressed data was written .
* @ input : Source buffer . ` input - > pos ` is updated to indicate how much data
* was read . Note that it may not consume the entire input , in which
* case ` input - > pos < input - > size ` , and it ' s up to the caller to
* present remaining data again .
*
* The ` input ` and ` output ` buffers may be any size . Guaranteed to make some
* forward progress if ` input ` and ` output ` are not empty .
*
* Return : A hint for the number of bytes to use as the input for the next
* function call or an error , which can be checked using
* zstd_is_error ( ) .
*/
size_t zstd_compress_stream(zstd_cstream *cstream, zstd_out_buffer *output,
zstd_in_buffer *input);
/**
* zstd_flush_stream ( ) - flush internal buffers into output
* @ cstream : The zstd streaming compression context .
* @ output : Destination buffer . ` output - > pos ` is updated to indicate how much
* compressed data was written .
*
* zstd_flush_stream ( ) must be called until it returns 0 , meaning all the data
* has been flushed . Since zstd_flush_stream ( ) causes a block to be ended ,
* calling it too often will degrade the compression ratio .
*
* Return : The number of bytes still present within internal buffers or an
* error , which can be checked using zstd_is_error ( ) .
*/
size_t zstd_flush_stream(zstd_cstream *cstream, zstd_out_buffer *output);
/**
* zstd_end_stream ( ) - flush internal buffers into output and end the frame
* @ cstream : The zstd streaming compression context .
* @ output : Destination buffer . ` output - > pos ` is updated to indicate how much
* compressed data was written .
*
* zstd_end_stream ( ) must be called until it returns 0 , meaning all the data has
* been flushed and the frame epilogue has been written .
*
* Return : The number of bytes still present within internal buffers or an
* error , which can be checked using zstd_is_error ( ) .
*/
size_t zstd_end_stream(zstd_cstream *cstream, zstd_out_buffer *output);
/* ====== Streaming Decompression ====== */
typedef ZSTD_DStream zstd_dstream;
/**
* zstd_dstream_workspace_bound ( ) - memory needed to initialize a zstd_dstream
* @ max_window_size : The maximum window size allowed for compressed frames .
*
* Return : A lower bound on the size of the workspace that is passed
* to zstd_init_dstream ( ) .
*/
size_t zstd_dstream_workspace_bound(size_t max_window_size);
/**
* zstd_init_dstream ( ) - initialize a zstd streaming decompression context
* @ max_window_size : The maximum window size allowed for compressed frames .
* @ workspace : The workspace to emplace the context into . It must outlive
* the returned context .
* @ workspaceSize : The size of workspace .
* Use zstd_dstream_workspace_bound ( max_window_size ) to
* determine how large the workspace must be .
*
* Return : The zstd streaming decompression context .
*/
zstd_dstream *zstd_init_dstream(size_t max_window_size, void *workspace,
size_t workspace_size);
/**
* zstd_reset_dstream ( ) - reset the context using parameters from creation
* @ dstream : The zstd streaming decompression context to reset .
*
* Resets the context using the parameters from creation . Skips dictionary
* loading , since it can be reused .
*
* Return : Zero or an error , which can be checked using zstd_is_error ( ) .
*/
size_t zstd_reset_dstream(zstd_dstream *dstream);
/**
* zstd_decompress_stream ( ) - streaming decompress some of input into output
* @ dstream : The zstd streaming decompression context .
* @ output : Destination buffer . ` output . pos ` is updated to indicate how much
* decompressed data was written .
* @ input : Source buffer . ` input . pos ` is updated to indicate how much data was
* read . Note that it may not consume the entire input , in which case
* ` input . pos < input . size ` , and it ' s up to the caller to present
* remaining data again .
*
* The ` input ` and ` output ` buffers may be any size . Guaranteed to make some
* forward progress if ` input ` and ` output ` are not empty .
* zstd_decompress_stream ( ) will not consume the last byte of the frame until
* the entire frame is flushed .
*
* Return : Returns 0 iff a frame is completely decoded and fully flushed .
* Otherwise returns a hint for the number of bytes to use as the
* input for the next function call or an error , which can be checked
* using zstd_is_error ( ) . The size hint will never load more than the
* frame .
*/
size_t zstd_decompress_stream(zstd_dstream *dstream, zstd_out_buffer *output,
zstd_in_buffer *input);
/* ====== Frame Inspection Functions ====== */
/**
* zstd_find_frame_compressed_size ( ) - returns the size of a compressed frame
* @ src : Source buffer . It should point to the start of a zstd encoded
* frame or a skippable frame .
* @ src_size : The size of the source buffer . It must be at least as large as the
* size of the frame .
*
* Return : The compressed size of the frame pointed to by ` src ` or an error ,
* which can be check with zstd_is_error ( ) .
* Suitable to pass to ZSTD_decompress ( ) or similar functions .
*/
size_t zstd_find_frame_compressed_size(const void *src, size_t src_size);
/**
* zstd_register_sequence_producer ( ) - exposes the zstd library function
* ZSTD_registerSequenceProducer ( ) . This is used for the block - level external
* sequence producer API . See upstream zstd . h for detailed documentation .
*/
typedef ZSTD_sequenceProducer_F zstd_sequence_producer_f;
void zstd_register_sequence_producer(
zstd_cctx *cctx,
void * sequence_producer_state,
zstd_sequence_producer_f sequence_producer
);
/**
* struct zstd_frame_params - zstd frame parameters stored in the frame header
* @ frameContentSize : The frame content size , or ZSTD_CONTENTSIZE_UNKNOWN if not
* present .
* @ windowSize : The window size , or 0 if the frame is a skippable frame .
* @ blockSizeMax : The maximum block size .
* @ frameType : The frame type ( zstd or skippable )
* @ headerSize : The size of the frame header .
* @ dictID : The dictionary id , or 0 if not present .
* @ checksumFlag : Whether a checksum was used .
*
* See zstd_lib . h .
*/
typedef ZSTD_FrameHeader zstd_frame_header;
/**
* zstd_get_frame_header ( ) - extracts parameters from a zstd or skippable frame
* @ params : On success the frame parameters are written here .
* @ src : The source buffer . It must point to a zstd or skippable frame .
* @ src_size : The size of the source buffer .
*
* Return : 0 on success . If more data is required it returns how many bytes
* must be provided to make forward progress . Otherwise it returns
* an error , which can be checked using zstd_is_error ( ) .
*/
size_t zstd_get_frame_header(zstd_frame_header *params, const void *src,
size_t src_size);
/**
* struct zstd_sequence - a sequence of literals or a match
*
* @ offset : The offset of the match
* @ litLength : The literal length of the sequence
* @ matchLength : The match length of the sequence
* @ rep : Represents which repeat offset is used
*/
typedef ZSTD_Sequence zstd_sequence;
/**
* zstd_compress_sequences_and_literals ( ) - compress an array of zstd_sequence and literals
*
* @ cctx : The zstd compression context .
* @ dst : The buffer to compress the data into .
* @ dst_capacity : The size of the destination buffer .
* @ in_seqs : The array of zstd_sequence to compress .
* @ in_seqs_size : The number of sequences in in_seqs .
* @ literals : The literals associated to the sequences to be compressed .
* @ lit_size : The size of the literals in the literals buffer .
* @ lit_capacity : The size of the literals buffer .
* @ decompressed_size : The size of the input data
*
* Return : The compressed size or an error , which can be checked using
* zstd_is_error ( ) .
*/
size_t zstd_compress_sequences_and_literals(zstd_cctx *cctx, void * dst, size_t dst_capacity,
const zstd_sequence *in_seqs, size_t in_seqs_size,
const void * literals, size_t lit_size, size_t lit_capacity,
size_t decompressed_size);
#endif /* LINUX_ZSTD_H */
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