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 /**********************************************************************
   Copyright(c) 2011-2016 Intel Corporation All rights reserved.
 
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 #ifndef _IGZIP_H
 #define _IGZIP_H
 
 /**
  * @file igzip_lib.h
  *
  * @brief This file defines the igzip compression and decompression interface, a
  * high performance deflate compression interface for storage applications.
  *
  * Deflate is a widely used compression standard that can be used standalone, it
  * also forms the basis of gzip and zlib compression formats. Igzip supports the
  * following flush features:
  *
  * - No Flush: The default method where no special flush is performed.
  *
  * - Sync flush: whereby isal_deflate() finishes the current deflate block at
  *   the end of each input buffer. The deflate block is byte aligned by
  *   appending an empty stored block.
  *
  * - Full flush: whereby isal_deflate() finishes and aligns the deflate block as
  *   in sync flush but also ensures that subsequent block's history does not
  *   look back beyond this point and new blocks are fully independent.
  *
  * Igzip also supports compression levels from ISAL_DEF_MIN_LEVEL to
  * ISAL_DEF_MAX_LEVEL.
  *
  * Igzip contains some behavior configurable at compile time. These
  * configurable options are:
  *
  * - IGZIP_HIST_SIZE - Defines the window size. The default value is 32K (note K
  *   represents 1024), but 8K is also supported. Powers of 2 which are at most
  *   32K may also work.
  *
  * - LONGER_HUFFTABLES - Defines whether to use a larger hufftables structure
  *   which may increase performance with smaller IGZIP_HIST_SIZE values. By
  *   default this option is not defined. This define sets IGZIP_HIST_SIZE to be
  *   8 if IGZIP_HIST_SIZE > 8K.
  *
  *   As an example, to compile gzip with an 8K window size, in a terminal run
  *   @verbatim gmake D="-D IGZIP_HIST_SIZE=8*1024" @endverbatim on Linux and
  *   FreeBSD, or with @verbatim nmake -f Makefile.nmake D="-D
  *   IGZIP_HIST_SIZE=8*1024" @endverbatim on Windows.
  *
  */
 #include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /******************************************************************************/
 /* Deflate Compression Standard Defines */
 /******************************************************************************/
 #define IGZIP_K                1024
 #define ISAL_DEF_MAX_HDR_SIZE  328
 #define ISAL_DEF_MAX_CODE_LEN  15
 #define ISAL_DEF_HIST_SIZE     (32 * IGZIP_K)
 #define ISAL_DEF_MAX_HIST_BITS 15
 #define ISAL_DEF_MAX_MATCH     258
 #define ISAL_DEF_MIN_MATCH     3
 
 #define ISAL_DEF_LIT_SYMBOLS     257
 #define ISAL_DEF_LEN_SYMBOLS     29
 #define ISAL_DEF_DIST_SYMBOLS    30
 #define ISAL_DEF_LIT_LEN_SYMBOLS (ISAL_DEF_LIT_SYMBOLS + ISAL_DEF_LEN_SYMBOLS)
 
 /* Max repeat length, rounded up to 32 byte boundary */
 #define ISAL_LOOK_AHEAD ((ISAL_DEF_MAX_MATCH + 31) & ~31)
 
 /******************************************************************************/
 /* Deflate Implementation Specific Defines */
 /******************************************************************************/
 /* Note IGZIP_HIST_SIZE must be a power of two */
 #ifndef IGZIP_HIST_SIZE
 #define IGZIP_HIST_SIZE ISAL_DEF_HIST_SIZE
 #endif
 
 #if (IGZIP_HIST_SIZE > ISAL_DEF_HIST_SIZE)
 #undef IGZIP_HIST_SIZE
 #define IGZIP_HIST_SIZE ISAL_DEF_HIST_SIZE
 #endif
 
 #ifdef LONGER_HUFFTABLE
 #if (IGZIP_HIST_SIZE > 8 * IGZIP_K)
 #undef IGZIP_HIST_SIZE
 #define IGZIP_HIST_SIZE (8 * IGZIP_K)
 #endif
 #endif
 
 #define ISAL_LIMIT_HASH_UPDATE
 
 #define IGZIP_HASH8K_HASH_SIZE   (8 * IGZIP_K)
 #define IGZIP_HASH_HIST_SIZE     IGZIP_HIST_SIZE
 #define IGZIP_HASH_MAP_HASH_SIZE IGZIP_HIST_SIZE
 
 #define IGZIP_LVL0_HASH_SIZE (8 * IGZIP_K)
 #define IGZIP_LVL1_HASH_SIZE IGZIP_HASH8K_HASH_SIZE
 #define IGZIP_LVL2_HASH_SIZE IGZIP_HASH_HIST_SIZE
 #define IGZIP_LVL3_HASH_SIZE IGZIP_HASH_MAP_HASH_SIZE
 
 #ifdef LONGER_HUFFTABLE
 enum { IGZIP_DIST_TABLE_SIZE = 8 * 1024 };
 
 /* DECODE_OFFSET is dist code index corresponding to DIST_TABLE_SIZE + 1 */
 enum { IGZIP_DECODE_OFFSET = 26 };
 #else
 enum { IGZIP_DIST_TABLE_SIZE = 2 };
 /* DECODE_OFFSET is dist code index corresponding to DIST_TABLE_SIZE + 1 */
 enum { IGZIP_DECODE_OFFSET = 0 };
 #endif
 enum { IGZIP_LEN_TABLE_SIZE = 256 };
 enum { IGZIP_LIT_TABLE_SIZE = ISAL_DEF_LIT_SYMBOLS };
 
 #define IGZIP_HUFFTABLE_CUSTOM  0
 #define IGZIP_HUFFTABLE_DEFAULT 1
 #define IGZIP_HUFFTABLE_STATIC  2
 
 /* Flush Flags */
 #define NO_FLUSH     0 /* Default */
 #define SYNC_FLUSH   1
 #define FULL_FLUSH   2
 #define FINISH_FLUSH 0 /* Deprecated */
 
 /* Gzip Flags */
 #define IGZIP_DEFLATE     0 /* Default */
 #define IGZIP_GZIP        1
 #define IGZIP_GZIP_NO_HDR 2
 #define IGZIP_ZLIB        3
 #define IGZIP_ZLIB_NO_HDR 4
 
 /* Compression Return values */
 #define COMP_OK                0
 #define INVALID_FLUSH          -7
 #define INVALID_PARAM          -8
 #define STATELESS_OVERFLOW     -1
 #define ISAL_INVALID_OPERATION -9
 #define ISAL_INVALID_STATE     -3
 #define ISAL_INVALID_LEVEL     -4 /* Invalid Compression level set */
 #define ISAL_INVALID_LEVEL_BUF -5 /* Invalid buffer specified for the compression level */
 
 /**
  *  @enum isal_zstate_state
  *  @brief Compression State please note ZSTATE_TRL only applies for GZIP compression
  */
 
 /* When the state is set to ZSTATE_NEW_HDR or TMP_ZSTATE_NEW_HEADER, the
  * hufftable being used for compression may be swapped
  */
 enum isal_zstate_state {
         ZSTATE_NEW_HDR,           //!< Header to be written
         ZSTATE_HDR,               //!< Header state
         ZSTATE_CREATE_HDR,        //!< Header to be created
         ZSTATE_BODY,              //!< Body state
         ZSTATE_FLUSH_READ_BUFFER, //!< Flush buffer
         ZSTATE_FLUSH_ICF_BUFFER,
         ZSTATE_TYPE0_HDR,             //! Type0 block header to be written
         ZSTATE_TYPE0_BODY,            //!< Type0 block body to be written
         ZSTATE_SYNC_FLUSH,            //!< Write sync flush block
         ZSTATE_FLUSH_WRITE_BUFFER,    //!< Flush bitbuf
         ZSTATE_TRL,                   //!< Trailer state
         ZSTATE_END,                   //!< End state
         ZSTATE_TMP_NEW_HDR,           //!< Temporary Header to be written
         ZSTATE_TMP_HDR,               //!< Temporary Header state
         ZSTATE_TMP_CREATE_HDR,        //!< Temporary Header to be created state
         ZSTATE_TMP_BODY,              //!< Temporary Body state
         ZSTATE_TMP_FLUSH_READ_BUFFER, //!< Flush buffer
         ZSTATE_TMP_FLUSH_ICF_BUFFER,
         ZSTATE_TMP_TYPE0_HDR,          //! Temporary Type0 block header to be written
         ZSTATE_TMP_TYPE0_BODY,         //!< Temporary Type0 block body to be written
         ZSTATE_TMP_SYNC_FLUSH,         //!< Write sync flush block
         ZSTATE_TMP_FLUSH_WRITE_BUFFER, //!< Flush bitbuf
         ZSTATE_TMP_TRL,                //!< Temporary Trailer state
         ZSTATE_TMP_END                 //!< Temporary End state
 };
 
 /* Offset used to switch between TMP states and non-tmp states */
 #define ZSTATE_TMP_OFFSET ZSTATE_TMP_HDR - ZSTATE_HDR
 
 /******************************************************************************/
 /* Inflate Implementation Specific Defines */
 /******************************************************************************/
 #define ISAL_DECODE_LONG_BITS  12
 #define ISAL_DECODE_SHORT_BITS 10
 
 /* Current state of decompression */
 enum isal_block_state {
         ISAL_BLOCK_NEW_HDR,    /* Just starting a new block */
         ISAL_BLOCK_HDR,        /* In the middle of reading in a block header */
         ISAL_BLOCK_TYPE0,      /* Decoding a type 0 block */
         ISAL_BLOCK_CODED,      /* Decoding a huffman coded block */
         ISAL_BLOCK_INPUT_DONE, /* Decompression of input is completed */
         ISAL_BLOCK_FINISH, /* Decompression of input is completed and all data has been flushed to
                               output */
         ISAL_GZIP_EXTRA_LEN,
         ISAL_GZIP_EXTRA,
         ISAL_GZIP_NAME,
         ISAL_GZIP_COMMENT,
         ISAL_GZIP_HCRC,
         ISAL_ZLIB_DICT,
         ISAL_CHECKSUM_CHECK,
 };
 
 /* Inflate Flags */
 #define ISAL_DEFLATE         0 /* Default */
 #define ISAL_GZIP            1
 #define ISAL_GZIP_NO_HDR     2
 #define ISAL_ZLIB            3
 #define ISAL_ZLIB_NO_HDR     4
 #define ISAL_ZLIB_NO_HDR_VER 5
 #define ISAL_GZIP_NO_HDR_VER 6
 
 /* Inflate Return values */
 #define ISAL_DECOMP_OK          0  /* No errors encountered while decompressing */
 #define ISAL_END_INPUT          1  /* End of input reached */
 #define ISAL_OUT_OVERFLOW       2  /* End of output reached */
 #define ISAL_NAME_OVERFLOW      3  /* End of gzip name buffer reached */
 #define ISAL_COMMENT_OVERFLOW   4  /* End of gzip name buffer reached */
 #define ISAL_EXTRA_OVERFLOW     5  /* End of extra buffer reached */
 #define ISAL_NEED_DICT          6  /* Stream needs a dictionary to continue */
 #define ISAL_INVALID_BLOCK      -1 /* Invalid deflate block found */
 #define ISAL_INVALID_SYMBOL     -2 /* Invalid deflate symbol found */
 #define ISAL_INVALID_LOOKBACK   -3 /* Invalid lookback distance found */
 #define ISAL_INVALID_WRAPPER    -4 /* Invalid gzip/zlib wrapper found */
 #define ISAL_UNSUPPORTED_METHOD -5 /* Gzip/zlib wrapper specifies unsupported compress method */
 #define ISAL_INCORRECT_CHECKSUM -6 /* Incorrect checksum found */
 
 /******************************************************************************/
 /* Compression structures */
 /******************************************************************************/
 /** @brief Holds histogram of deflate symbols*/
 struct isal_huff_histogram {
         uint64_t lit_len_histogram[ISAL_DEF_LIT_LEN_SYMBOLS]; //!< Histogram of Literal/Len symbols
                                                               //!< seen
         uint64_t dist_histogram[ISAL_DEF_DIST_SYMBOLS]; //!< Histogram of Distance Symbols seen
         uint16_t hash_table[IGZIP_LVL0_HASH_SIZE];      //!< Tmp space used as a hash table
 };
 
 /** @brief Holds modified histogram */
 struct isal_mod_hist {
         uint32_t d_hist[30];   //!< Distance
         uint32_t ll_hist[513]; //! Literal/length
 };
 
 #define ISAL_DEF_MIN_LEVEL 0
 #define ISAL_DEF_MAX_LEVEL 3
 
 /* Defines used set level data sizes */
 /* has to be at least sizeof(struct level_buf) + sizeof(struct lvlX_buf */
 #define ISAL_DEF_LVL0_REQ        0
 #define ISAL_DEF_LVL1_REQ        (4 * IGZIP_K + 2 * IGZIP_LVL1_HASH_SIZE)
 #define ISAL_DEF_LVL1_TOKEN_SIZE 4
 #define ISAL_DEF_LVL2_REQ        (4 * IGZIP_K + 2 * IGZIP_LVL2_HASH_SIZE)
 #define ISAL_DEF_LVL2_TOKEN_SIZE 4
 #define ISAL_DEF_LVL3_REQ        4 * IGZIP_K + 4 * 4 * IGZIP_K + 2 * IGZIP_LVL3_HASH_SIZE
 #define ISAL_DEF_LVL3_TOKEN_SIZE 4
 
 /* Data sizes for level specific data options */
 #define ISAL_DEF_LVL0_MIN         ISAL_DEF_LVL0_REQ
 #define ISAL_DEF_LVL0_SMALL       ISAL_DEF_LVL0_REQ
 #define ISAL_DEF_LVL0_MEDIUM      ISAL_DEF_LVL0_REQ
 #define ISAL_DEF_LVL0_LARGE       ISAL_DEF_LVL0_REQ
 #define ISAL_DEF_LVL0_EXTRA_LARGE ISAL_DEF_LVL0_REQ
 #define ISAL_DEF_LVL0_DEFAULT     ISAL_DEF_LVL0_REQ
 
 #define ISAL_DEF_LVL1_MIN         (ISAL_DEF_LVL1_REQ + ISAL_DEF_LVL1_TOKEN_SIZE * 1 * IGZIP_K)
 #define ISAL_DEF_LVL1_SMALL       (ISAL_DEF_LVL1_REQ + ISAL_DEF_LVL1_TOKEN_SIZE * 16 * IGZIP_K)
 #define ISAL_DEF_LVL1_MEDIUM      (ISAL_DEF_LVL1_REQ + ISAL_DEF_LVL1_TOKEN_SIZE * 32 * IGZIP_K)
 #define ISAL_DEF_LVL1_LARGE       (ISAL_DEF_LVL1_REQ + ISAL_DEF_LVL1_TOKEN_SIZE * 64 * IGZIP_K)
 #define ISAL_DEF_LVL1_EXTRA_LARGE (ISAL_DEF_LVL1_REQ + ISAL_DEF_LVL1_TOKEN_SIZE * 128 * IGZIP_K)
 #define ISAL_DEF_LVL1_DEFAULT     ISAL_DEF_LVL1_LARGE
 
 #define ISAL_DEF_LVL2_MIN         (ISAL_DEF_LVL2_REQ + ISAL_DEF_LVL2_TOKEN_SIZE * 1 * IGZIP_K)
 #define ISAL_DEF_LVL2_SMALL       (ISAL_DEF_LVL2_REQ + ISAL_DEF_LVL2_TOKEN_SIZE * 16 * IGZIP_K)
 #define ISAL_DEF_LVL2_MEDIUM      (ISAL_DEF_LVL2_REQ + ISAL_DEF_LVL2_TOKEN_SIZE * 32 * IGZIP_K)
 #define ISAL_DEF_LVL2_LARGE       (ISAL_DEF_LVL2_REQ + ISAL_DEF_LVL2_TOKEN_SIZE * 64 * IGZIP_K)
 #define ISAL_DEF_LVL2_EXTRA_LARGE (ISAL_DEF_LVL2_REQ + ISAL_DEF_LVL2_TOKEN_SIZE * 128 * IGZIP_K)
 #define ISAL_DEF_LVL2_DEFAULT     ISAL_DEF_LVL2_LARGE
 
 #define ISAL_DEF_LVL3_MIN         (ISAL_DEF_LVL3_REQ + ISAL_DEF_LVL3_TOKEN_SIZE * 1 * IGZIP_K)
 #define ISAL_DEF_LVL3_SMALL       (ISAL_DEF_LVL3_REQ + ISAL_DEF_LVL3_TOKEN_SIZE * 16 * IGZIP_K)
 #define ISAL_DEF_LVL3_MEDIUM      (ISAL_DEF_LVL3_REQ + ISAL_DEF_LVL3_TOKEN_SIZE * 32 * IGZIP_K)
 #define ISAL_DEF_LVL3_LARGE       (ISAL_DEF_LVL3_REQ + ISAL_DEF_LVL3_TOKEN_SIZE * 64 * IGZIP_K)
 #define ISAL_DEF_LVL3_EXTRA_LARGE (ISAL_DEF_LVL3_REQ + ISAL_DEF_LVL3_TOKEN_SIZE * 128 * IGZIP_K)
 #define ISAL_DEF_LVL3_DEFAULT     ISAL_DEF_LVL3_LARGE
 
 #define IGZIP_NO_HIST       0
 #define IGZIP_HIST          1
 #define IGZIP_DICT_HIST     2
 #define IGZIP_DICT_HASH_SET 3
 
 /** @brief Holds Bit Buffer information*/
 struct BitBuf2 {
         uint64_t m_bits;      //!< bits in the bit buffer
         uint32_t m_bit_count; //!< number of valid bits in the bit buffer
         uint8_t *m_out_buf;   //!< current index of buffer to write to
         uint8_t *m_out_end;   //!< end of buffer to write to
         uint8_t *m_out_start; //!< start of buffer to write to
 };
 
 /** @brief Holds Zlib header information */
 struct isal_zlib_header {
         uint32_t info;      //!< base-2 logarithm of the LZ77 window size minus 8
         uint32_t level;     //!< Compression level (fastest, fast, default, maximum)
         uint32_t dict_id;   //!< Dictionary id
         uint32_t dict_flag; //!< Whether to use a dictionary
 };
 
 /** @brief Holds Gzip header information */
 struct isal_gzip_header {
         uint32_t text;            //!< Optional Text hint
         uint32_t time;            //!< Unix modification time in gzip header
         uint32_t xflags;          //!< xflags in gzip header
         uint32_t os;              //!< OS in gzip header
         uint8_t *extra;           //!< Extra field in gzip header
         uint32_t extra_buf_len;   //!< Length of extra buffer
         uint32_t extra_len;       //!< Actual length of gzip header extra field
         char *name;               //!< Name in gzip header
         uint32_t name_buf_len;    //!< Length of name buffer
         char *comment;            //!< Comments in gzip header
         uint32_t comment_buf_len; //!< Length of comment buffer
         uint32_t hcrc;            //!< Header crc or header crc flag
         uint32_t flags;           //!< Internal data
 };
 
 /* Variable prefixes:
  * b_ : Measured wrt the start of the buffer
  * f_ : Measured wrt the start of the file (aka file_start)
  */
 
 /** @brief Holds the internal state information for input and output compression streams*/
 struct isal_zstate {
         uint32_t total_in_start; //!< Not used, may be replaced with something else
         uint32_t block_next;     //!< Start of current deflate block in the input
         uint32_t block_end;      //!< End of current deflate block in the input
         uint32_t dist_mask;      //!< Distance mask used.
         uint32_t hash_mask;
         enum isal_zstate_state state; //!< Current state in processing the data stream
         struct BitBuf2 bitbuf;        //!< Bit Buffer
         uint32_t crc;                 //!< Current checksum without finalize step if any (adler)
         uint8_t has_wrap_hdr;         //!< keeps track of wrapper header
         uint8_t has_eob_hdr;          //!< keeps track of eob hdr (with BFINAL set)
         uint8_t has_eob;              //!< keeps track of eob on the last deflate block
         uint8_t has_hist;             //!< flag to track if there is match history
         uint16_t
                 has_level_buf_init; //!< flag to track if user supplied memory has been initialized.
         uint32_t count;             //!< used for partial header/trailer writes
         uint8_t tmp_out_buff[16];   //!< temporary array
         uint32_t tmp_out_start;     //!< temporary variable
         uint32_t tmp_out_end;       //!< temporary variable
         uint32_t b_bytes_valid;     //!< number of valid bytes in buffer
         uint32_t b_bytes_processed; //!< number of bytes processed in buffer
         uint8_t buffer[2 * IGZIP_HIST_SIZE + ISAL_LOOK_AHEAD]; //!< Internal buffer
 
         /* Stream should be setup such that the head is cache aligned*/
         uint16_t head[IGZIP_LVL0_HASH_SIZE]; //!< Hash array
 };
 
 /** @brief Holds the huffman tree used to huffman encode the input stream **/
 struct isal_hufftables {
 
         uint8_t deflate_hdr[ISAL_DEF_MAX_HDR_SIZE]; //!< deflate huffman tree header
         uint32_t deflate_hdr_count;                 //!< Number of whole bytes in deflate_huff_hdr
         uint32_t deflate_hdr_extra_bits; //!< Number of bits in the partial byte in header
         uint32_t dist_table[IGZIP_DIST_TABLE_SIZE]; //!< bits 4:0 are the code length, bits 31:5 are
                                                     //!< the code
         uint32_t len_table[IGZIP_LEN_TABLE_SIZE];   //!< bits 4:0 are the code length, bits 31:5 are
                                                     //!< the code
         uint16_t lit_table[IGZIP_LIT_TABLE_SIZE];   //!< literal code
         uint8_t lit_table_sizes[IGZIP_LIT_TABLE_SIZE];  //!< literal code length
         uint16_t dcodes[30 - IGZIP_DECODE_OFFSET];      //!< distance code
         uint8_t dcodes_sizes[30 - IGZIP_DECODE_OFFSET]; //!< distance code length
 };
 
 /** @brief Holds stream information*/
 struct isal_zstream {
         uint8_t *next_in;  //!< Next input byte
         uint32_t avail_in; //!< number of bytes available at next_in
         uint32_t total_in; //!< total number of bytes read so far
 
         uint8_t *next_out;  //!< Next output byte
         uint32_t avail_out; //!< number of bytes available at next_out
         uint32_t total_out; //!< total number of bytes written so far
 
         struct isal_hufftables *hufftables; //!< Huffman encoding used when compressing
         uint32_t level;                     //!< Compression level to use
         uint32_t level_buf_size;            //!< Size of level_buf
         uint8_t *level_buf;     //!< User allocated buffer required for different compression levels
         uint16_t end_of_stream; //!< non-zero if this is the last input buffer
         uint16_t flush;         //!< Flush type can be NO_FLUSH, SYNC_FLUSH or FULL_FLUSH
         uint16_t gzip_flag;     //!< Indicate if gzip compression is to be performed
         uint16_t hist_bits;     //!< Log base 2 of maximum lookback distance, 0 is use default
         struct isal_zstate internal_state; //!< Internal state for this stream
 };
 
 /******************************************************************************/
 /* Inflate structures */
 /******************************************************************************/
 /*
  * Inflate_huff_code data structures are used to store a Huffman code for fast
  * lookup. It works by performing a lookup in short_code_lookup that hopefully
  * yields the correct symbol. Otherwise a lookup into long_code_lookup is
  * performed to find the correct symbol. The details of how this works follows:
  *
  * Let i be some index into short_code_lookup and let e be the associated
  * element.  Bit 15 in e is a flag. If bit 15 is not set, then index i contains
  * a Huffman code for a symbol which has length at most DECODE_LOOKUP_SIZE. Bits
  * 0 through 8 are the symbol associated with that code and bits 9 through 12 of
  * e represent the number of bits in the code. If bit 15 is set, the i
  * corresponds to the first DECODE_LOOKUP_SIZE bits of a Huffman code which has
  * length longer than DECODE_LOOKUP_SIZE. In this case, bits 0 through 8
  * represent an offset into long_code_lookup table and bits 9 through 12
  * represent the maximum length of a Huffman code starting with the bits in the
  * index i. The offset into long_code_lookup is for an array associated with all
  * codes which start with the bits in i.
  *
  * The elements of long_code_lookup are in the same format as short_code_lookup,
  * except bit 15 is never set. Let i be a number made up of DECODE_LOOKUP_SIZE
  * bits.  Then all Huffman codes which start with DECODE_LOOKUP_SIZE bits are
  * stored in an array starting at index h in long_code_lookup. This index h is
  * stored in bits 0 through 9 at index i in short_code_lookup. The index j is an
  * index of this array if the number of bits contained in j and i is the number
  * of bits in the longest huff_code starting with the bits of i. The symbol
  * stored at index j is the symbol whose huffcode can be found in (j <<
  * DECODE_LOOKUP_SIZE) | i. Note these arrays will be stored sorted in order of
  * maximum Huffman code length.
  *
  * The following are explanations for sizes of the tables:
  *
  * Since short_code_lookup is a lookup on DECODE_LOOKUP_SIZE bits, it must have
  * size 2^DECODE_LOOKUP_SIZE.
  *
  * To determine the amount of memory required for long_code_lookup, note that
  * any element of long_code_lookup corresponds to a code, a duplicate of an
  * existing code, or a invalid code. Since deflate Huffman are stored such that
  * the code size and the code value form an increasing function, the number of
  * duplicates is maximized when all the duplicates are contained in a single
  * array, thus there are at most 2^(15 - DECODE_LOOKUP_SIZE) -
  * (DECODE_LOOKUP_SIZE + 1) duplicate elements. Similarly the number of invalid
  * elements is maximized at 2^(15 - DECODE_LOOKUP_SIZE) - 2^(floor((15 -
  * DECODE_LOOKUP_SIZE)/2) - 2^(ceil((15 - DECODE_LOOKUP_SIZE)/2) + 1. Thus the
  * amount of memory required is: NUM_CODES + 2^(16 - DECODE_LOOKUP_SIZE) -
  * (DECODE_LOOKUP_SIZE + 1) - 2^(floor((15 - DECODE_LOOKUP_SIZE)/2) -
  * 2^(ceil((15 - DECODE_LOOKUP_SIZE)/2) + 1. The values used below are those
  * values rounded up to the nearest 16 byte boundary
  *
  * Note that DECODE_LOOKUP_SIZE can be any length even though the offset in
  * small_lookup_code is 9 bits long because the increasing relationship between
  * code length and code value forces the maximum offset to be less than 288.
  */
 
 /* In the following defines, L stands for LARGE and S for SMALL */
 #define ISAL_L_REM (21 - ISAL_DECODE_LONG_BITS)
 #define ISAL_S_REM (15 - ISAL_DECODE_SHORT_BITS)
 
 #define ISAL_L_DUP ((1 << ISAL_L_REM) - (ISAL_L_REM + 1))
 #define ISAL_S_DUP ((1 << ISAL_S_REM) - (ISAL_S_REM + 1))
 
 #define ISAL_L_UNUSED                                                                              \
         ((1 << ISAL_L_REM) - (1 << ((ISAL_L_REM) / 2)) - (1 << ((ISAL_L_REM + 1) / 2)) + 1)
 #define ISAL_S_UNUSED                                                                              \
         ((1 << ISAL_S_REM) - (1 << ((ISAL_S_REM) / 2)) - (1 << ((ISAL_S_REM + 1) / 2)) + 1)
 
 #define ISAL_L_SIZE (ISAL_DEF_LIT_LEN_SYMBOLS + ISAL_L_DUP + ISAL_L_UNUSED)
 #define ISAL_S_SIZE (ISAL_DEF_DIST_SYMBOLS + ISAL_S_DUP + ISAL_S_UNUSED)
 
 #define ISAL_HUFF_CODE_LARGE_LONG_ALIGNED (ISAL_L_SIZE + (-ISAL_L_SIZE & 0xf))
 #define ISAL_HUFF_CODE_SMALL_LONG_ALIGNED (ISAL_S_SIZE + (-ISAL_S_SIZE & 0xf))
 
 /** @brief Large lookup table for decoding huffman codes */
 struct inflate_huff_code_large {
         uint32_t short_code_lookup[1 << (ISAL_DECODE_LONG_BITS)];     //!< Short code lookup table
         uint16_t long_code_lookup[ISAL_HUFF_CODE_LARGE_LONG_ALIGNED]; //!< Long code lookup table
 };
 
 /** @brief Small lookup table for decoding huffman codes */
 struct inflate_huff_code_small {
         uint16_t short_code_lookup[1 << (ISAL_DECODE_SHORT_BITS)];    //!< Short code lookup table
         uint16_t long_code_lookup[ISAL_HUFF_CODE_SMALL_LONG_ALIGNED]; //!< Long code lookup table
 };
 
 /** @brief Holds decompression state information*/
 struct inflate_state {
         uint8_t *next_out;                            //!< Next output Byte
         uint32_t avail_out;                           //!< Number of bytes available at next_out
         uint32_t total_out;                           //!< Total bytes written out so far
         uint8_t *next_in;                             //!< Next input byte
         uint64_t read_in;                             //!< Bits buffered to handle unaligned streams
         uint32_t avail_in;                            //!< Number of bytes available at next_in
         int32_t read_in_length;                       //!< Bits in read_in
         struct inflate_huff_code_large lit_huff_code; //!< Structure for decoding lit/len symbols
         struct inflate_huff_code_small dist_huff_code; //!< Structure for decoding dist symbols
         enum isal_block_state block_state;             //!< Current decompression state
         uint32_t dict_length;                          //!< Length of dictionary used
         uint32_t bfinal;                               //!< Flag identifying final block
         uint32_t crc_flag;                             //!< Flag identifying whether to track of crc
         uint32_t crc;       //!< Contains crc or adler32 of output if crc_flag is set
         uint32_t hist_bits; //!< Log base 2 of maximum lookback distance
         union {
                 int32_t type0_block_len; //!< Length left to read of type 0 block when outbuffer
                                          //!< overflow occurred
                 int32_t count;           //!< Count of bytes remaining to be parsed
                 uint32_t dict_id;
         };
         int32_t write_overflow_lits;
         int32_t write_overflow_len;
         int32_t copy_overflow_length;   //!< Length left to copy when outbuffer overflow occurred
         int32_t copy_overflow_distance; //!< Lookback distance when outbuffer overflow occurred
         int16_t wrapper_flag;
         int16_t tmp_in_size;       //!< Number of bytes in tmp_in_buffer
         int32_t tmp_out_valid;     //!< Number of bytes in tmp_out_buffer
         int32_t tmp_out_processed; //!< Number of bytes processed in tmp_out_buffer
         uint8_t tmp_in_buffer[ISAL_DEF_MAX_HDR_SIZE]; //!< Temporary buffer containing data from the
                                                       //!< input stream
         uint8_t tmp_out_buffer[2 * ISAL_DEF_HIST_SIZE +
                                ISAL_LOOK_AHEAD]; //!< Temporary buffer containing data from the
                                                  //!< output stream
 };
 
 /******************************************************************************/
 /* Compression functions */
 /******************************************************************************/
 /**
  * @brief Updates histograms to include the symbols found in the input
  * stream. Since this function only updates the histograms, it can be called on
  * multiple streams to get a histogram better representing the desired data
  * set. When first using histogram it must be initialized by zeroing the
  * structure.
  *
  * @param in_stream: Input stream of data.
  * @param length: The length of start_stream.
  * @param histogram: The returned histogram of lit/len/dist symbols.
  */
 void
 isal_update_histogram(uint8_t *in_stream, int length, struct isal_huff_histogram *histogram);
 
 /**
  * @brief Creates a custom huffman code for the given histograms in which
  *  every literal and repeat length is assigned a code and all possible lookback
  *  distances are assigned a code.
  *
  * @param hufftables: the output structure containing the huffman code
  * @param histogram: histogram containing frequency of literal symbols,
  *        repeat lengths and lookback distances
  * @returns Returns a non zero value if an invalid huffman code was created.
  */
 int
 isal_create_hufftables(struct isal_hufftables *hufftables, struct isal_huff_histogram *histogram);
 
 /**
  * @brief Creates a custom huffman code for the given histograms like
  * isal_create_hufftables() except literals with 0 frequency in the histogram
  * are not assigned a code
  *
  * @param hufftables: the output structure containing the huffman code
  * @param histogram: histogram containing frequency of literal symbols,
  *        repeat lengths and lookback distances
  * @returns Returns a non zero value if an invalid huffman code was created.
  */
 int
 isal_create_hufftables_subset(struct isal_hufftables *hufftables,
                               struct isal_huff_histogram *histogram);
 
 /**
  * @brief Initialize compression stream data structure
  *
  * @param stream Structure holding state information on the compression streams.
  * @returns none
  */
 void
 isal_deflate_init(struct isal_zstream *stream);
 
 /**
  * @brief Reinitialize compression stream data structure. Performs the same
  * action as isal_deflate_init, but does not change user supplied input such as
  * the level, flush type, compression wrapper (like gzip), hufftables, and
  * end_of_stream_flag.
  *
  * @param stream Structure holding state information on the compression streams.
  * @returns none
  */
 void
 isal_deflate_reset(struct isal_zstream *stream);
 
 /**
  * @brief Set gzip header default values
  *
  * @param gz_hdr: Gzip header to initialize.
  */
 void
 isal_gzip_header_init(struct isal_gzip_header *gz_hdr);
 
 /**
  * @brief Set zlib header default values
  *
  * @param z_hdr: zlib header to initialize.
  */
 void
 isal_zlib_header_init(struct isal_zlib_header *z_hdr);
 
 /**
  * @brief Write gzip header to output stream
  *
  * Writes the gzip header to the output stream. On entry this function assumes
  * that the output buffer has been initialized, so stream->next_out,
  * stream->avail_out and stream->total_out have been set. If the output buffer
  * contains insufficient space, stream is not modified.
  *
  * @param stream: Structure holding state information on the compression stream.
  * @param gz_hdr: Structure holding the gzip header information to encode.
  *
  * @returns Returns 0 if the header is successfully written, otherwise returns
  * the minimum size required to successfully write the gzip header to the output
  * buffer.
  */
 uint32_t
 isal_write_gzip_header(struct isal_zstream *stream, struct isal_gzip_header *gz_hdr);
 
 /**
  * @brief Write zlib header to output stream
  *
  * Writes the zlib header to the output stream. On entry this function assumes
  * that the output buffer has been initialized, so stream->next_out,
  * stream->avail_out and stream->total_out have been set. If the output buffer
  * contains insufficient space, stream is not modified.
  *
  * @param stream: Structure holding state information on the compression stream.
  * @param z_hdr: Structure holding the zlib header information to encode.
  *
  * @returns Returns 0 if the header is successfully written, otherwise returns
  * the minimum size required to successfully write the zlib header to the output
  * buffer.
  */
 uint32_t
 isal_write_zlib_header(struct isal_zstream *stream, struct isal_zlib_header *z_hdr);
 
 /**
  * @brief Set stream to use a new Huffman code
  *
  * Sets the Huffman code to be used in compression before compression start or
  * after the successful completion of a SYNC_FLUSH or FULL_FLUSH. If type has
  * value IGZIP_HUFFTABLE_DEFAULT, the stream is set to use the default Huffman
  * code. If type has value IGZIP_HUFFTABLE_STATIC, the stream is set to use the
  * deflate standard static Huffman code, or if type has value
  * IGZIP_HUFFTABLE_CUSTOM, the stream is set to sue the isal_hufftables
  * structure input to isal_deflate_set_hufftables.
  *
  * @param stream: Structure holding state information on the compression stream.
  * @param hufftables: new huffman code to use if type is set to
  * IGZIP_HUFFTABLE_CUSTOM.
  * @param type: Flag specifying what hufftable to use.
  *
  * @returns Returns INVALID_OPERATION if the stream was unmodified. This may be
  * due to the stream being in a state where changing the huffman code is not
  * allowed or an invalid input is provided.
  */
 int
 isal_deflate_set_hufftables(struct isal_zstream *stream, struct isal_hufftables *hufftables,
                             int type);
 
 /**
  * @brief Initialize compression stream data structure
  *
  * @param stream Structure holding state information on the compression streams.
  * @returns none
  */
 void
 isal_deflate_stateless_init(struct isal_zstream *stream);
 
 /**
  * @brief Set compression dictionary to use
  *
  * This function is to be called after isal_deflate_init, or after completing a
  * SYNC_FLUSH or FULL_FLUSH and before the next call do isal_deflate. If the
  * dictionary is longer than IGZIP_HIST_SIZE, only the last IGZIP_HIST_SIZE
  * bytes will be used.
  *
  * @param stream Structure holding state information on the compression streams.
  * @param dict: Array containing dictionary to use.
  * @param dict_len: Length of dict.
  * @returns COMP_OK,
  *          ISAL_INVALID_STATE (dictionary could not be set)
  */
 int
 isal_deflate_set_dict(struct isal_zstream *stream, uint8_t *dict, uint32_t dict_len);
 
 /** @brief Structure for holding processed dictionary information */
 
 struct isal_dict {
         uint32_t params;
         uint32_t level;
         uint32_t hist_size;
         uint32_t hash_size;
         uint8_t history[ISAL_DEF_HIST_SIZE];
         uint16_t hashtable[IGZIP_LVL3_HASH_SIZE];
 };
 
 /**
  * @brief Process dictionary to reuse later
  *
  * Processes a dictionary so that the generated output can be reused to reset a
  * new deflate stream more quickly than isal_deflate_set_dict() alone. This
  * function is paired with isal_deflate_reset_dict() when using the same
  * dictionary on multiple deflate objects. The stream.level must be set prior to
  * calling this function to process the dictionary correctly. If the dictionary
  * is longer than IGZIP_HIST_SIZE, only the last IGZIP_HIST_SIZE bytes will be
  * used.
  *
  * @param stream Structure holding state information on the compression streams.
  * @param dict_str: Structure to hold processed dictionary info to reuse later.
  * @param dict: Array containing dictionary to use.
  * @param dict_len: Length of dict.
  * @returns COMP_OK,
  *          ISAL_INVALID_STATE (dictionary could not be processed)
  */
 int
 isal_deflate_process_dict(struct isal_zstream *stream, struct isal_dict *dict_str, uint8_t *dict,
                           uint32_t dict_len);
 
 /**
  * @brief Reset compression dictionary to use
  *
  * Similar to isal_deflate_set_dict() but on pre-processed dictionary
  * data. Pairing with isal_deflate_process_dict() can reduce the processing time
  * on subsequent compression with dictionary especially on small files.
  *
  * Like isal_deflate_set_dict(), this function is to be called after
  * isal_deflate_init, or after completing a SYNC_FLUSH or FULL_FLUSH and before
  * the next call do isal_deflate. Changing compression level between dictionary
  * process and reset will cause return of ISAL_INVALID_STATE.
  *
  * @param stream Structure holding state information on the compression streams.
  * @param dict_str: Structure with pre-processed dictionary info.
  * @returns COMP_OK,
  *          ISAL_INVALID_STATE or other (dictionary could not be reset)
  */
 int
 isal_deflate_reset_dict(struct isal_zstream *stream, struct isal_dict *dict_str);
 
 /**
  * @brief Fast data (deflate) compression for storage applications.
  *
  * The call to isal_deflate() will take data from the input buffer (updating
  * next_in, avail_in and write a compressed stream to the output buffer
  * (updating next_out and avail_out). The function returns when either the input
  * buffer is empty or the output buffer is full.
  *
  * On entry to isal_deflate(), next_in points to an input buffer and avail_in
  * indicates the length of that buffer. Similarly next_out points to an empty
  * output buffer and avail_out indicates the size of that buffer.
  *
  * The fields total_in and total_out start at 0 and are updated by
  * isal_deflate(). These reflect the total number of bytes read or written so far.
  *
  * When the last input buffer is passed in, signaled by setting the
  * end_of_stream, the routine will complete compression at the end of the input
  * buffer, as long as the output buffer is big enough.
  *
  * The compression level can be set by setting level to any value between
  * ISAL_DEF_MIN_LEVEL and ISAL_DEF_MAX_LEVEL. When the compression level is
  * ISAL_DEF_MIN_LEVEL, hufftables can be set to a table trained for the the
  * specific data type being compressed to achieve better compression. When a
  * higher compression level is desired, a larger generic memory buffer needs to
  * be supplied by setting level_buf and level_buf_size to represent the chunk of
  * memory. For level x, the suggest size for this buffer this buffer is
  * ISAL_DEFL_LVLx_DEFAULT. The defines ISAL_DEFL_LVLx_MIN, ISAL_DEFL_LVLx_SMALL,
  * ISAL_DEFL_LVLx_MEDIUM, ISAL_DEFL_LVLx_LARGE, and ISAL_DEFL_LVLx_EXTRA_LARGE
  * are also provided as other suggested sizes.
  *
  * The equivalent of the zlib FLUSH_SYNC operation is currently supported.
  * Flush types can be NO_FLUSH, SYNC_FLUSH or FULL_FLUSH. Default flush type is
  * NO_FLUSH. A SYNC_ OR FULL_ flush will byte align the deflate block by
  * appending an empty stored block once all input has been compressed, including
  * the buffered input. Checking that the out_buffer is not empty or that
  * internal_state.state = ZSTATE_NEW_HDR is sufficient to guarantee all input
  * has been flushed. Additionally FULL_FLUSH will ensure look back history does
  * not include previous blocks so new blocks are fully independent. Switching
  * between flush types is supported.
  *
  * If a compression dictionary is required, the dictionary can be set calling
  * isal_deflate_set_dictionary before calling isal_deflate.
  *
  * If the gzip_flag is set to IGZIP_GZIP, a generic gzip header and the gzip
  * trailer are written around the deflate compressed data. If gzip_flag is set
  * to IGZIP_GZIP_NO_HDR, then only the gzip trailer is written. A full-featured
  * header is supported by the isal_write_{gzip,zlib}_header() functions.
  *
  * @param  stream Structure holding state information on the compression streams.
  * @return COMP_OK (if everything is ok),
  *         INVALID_FLUSH (if an invalid FLUSH is selected),
  *         ISAL_INVALID_LEVEL (if an invalid compression level is selected),
  *         ISAL_INVALID_LEVEL_BUF (if the level buffer is not large enough).
  */
 int
 isal_deflate(struct isal_zstream *stream);
 
 /**
  * @brief Fast data (deflate) stateless compression for storage applications.
  *
  * Stateless (one shot) compression routine with a similar interface to
  * isal_deflate() but operates on entire input buffer at one time. Parameter
  * avail_out must be large enough to fit the entire compressed output. Max
  * expansion is limited to the input size plus the header size of a stored/raw
  * block.
  *
  * When the compression level is set to 1, unlike in isal_deflate(), level_buf
  * may be optionally set depending on what what performance is desired.
  *
  * For stateless the flush types NO_FLUSH and FULL_FLUSH are supported.
  * FULL_FLUSH will byte align the output deflate block so additional blocks can
  * be easily appended.
  *
  * If the gzip_flag is set to IGZIP_GZIP, a generic gzip header and the gzip
  * trailer are written around the deflate compressed data. If gzip_flag is set
  * to IGZIP_GZIP_NO_HDR, then only the gzip trailer is written.
  *
  * @param  stream Structure holding state information on the compression streams.
  * @return COMP_OK (if everything is ok),
  *         INVALID_FLUSH (if an invalid FLUSH is selected),
  *         ISAL_INVALID_LEVEL (if an invalid compression level is selected),
  *         ISAL_INVALID_LEVEL_BUF (if the level buffer is not large enough),
  *         STATELESS_OVERFLOW (if output buffer will not fit output).
  */
 int
 isal_deflate_stateless(struct isal_zstream *stream);
 
 /******************************************************************************/
 /* Inflate functions */
 /******************************************************************************/
 /**
  * @brief Initialize decompression state data structure
  *
  * @param state Structure holding state information on the compression streams.
  * @returns none
  */
 void
 isal_inflate_init(struct inflate_state *state);
 
 /**
  * @brief Reinitialize decompression state data structure
  *
  * @param state Structure holding state information on the compression streams.
  * @returns none
  */
 void
 isal_inflate_reset(struct inflate_state *state);
 
 /**
  * @brief Set decompression dictionary to use
  *
  * This function is to be called after isal_inflate_init. If the dictionary is
  * longer than IGZIP_HIST_SIZE, only the last IGZIP_HIST_SIZE bytes will be
  * used.
  *
  * @param state: Structure holding state information on the decompression stream.
  * @param dict: Array containing dictionary to use.
  * @param dict_len: Length of dict.
  * @returns COMP_OK,
  *          ISAL_INVALID_STATE (dictionary could not be set)
  */
 int
 isal_inflate_set_dict(struct inflate_state *state, uint8_t *dict, uint32_t dict_len);
 
 /**
  * @brief Read and return gzip header information
  *
  * On entry state must be initialized and next_in pointing to a gzip compressed
  * buffer. The buffers gz_hdr->extra, gz_hdr->name, gz_hdr->comments and the
  * buffer lengths must be set to record the corresponding field, or set to NULL
  * to disregard that gzip header information. If one of these buffers overflows,
  * the user can reallocate a larger buffer and call this function again to
  * continue reading the header information.
  *
  * @param state: Structure holding state information on the decompression stream.
  * @param gz_hdr: Structure to return data encoded in the gzip header
  * @returns ISAL_DECOMP_OK (header was successfully parsed)
  *          ISAL_END_INPUT (all input was parsed),
  *          ISAL_NAME_OVERFLOW (gz_hdr->name overflowed while parsing),
  *          ISAL_COMMENT_OVERFLOW (gz_hdr->comment overflowed while parsing),
  *          ISAL_EXTRA_OVERFLOW (gz_hdr->extra overflowed while parsing),
  *          ISAL_INVALID_WRAPPER (invalid gzip header found),
  *          ISAL_UNSUPPORTED_METHOD (deflate is not the compression method),
  *          ISAL_INCORRECT_CHECKSUM (gzip header checksum was incorrect)
  */
 int
 isal_read_gzip_header(struct inflate_state *state, struct isal_gzip_header *gz_hdr);
 
 /**
  * @brief Read and return zlib header information
  *
  * On entry state must be initialized and next_in pointing to a zlib compressed
  * buffer.
  *
  * @param state: Structure holding state information on the decompression stream.
  * @param zlib_hdr: Structure to return data encoded in the zlib header
  * @returns ISAL_DECOMP_OK (header was successfully parsed),
  *          ISAL_END_INPUT (all input was parsed),
  *          ISAL_UNSUPPORTED_METHOD (deflate is not the compression method),
  *          ISAL_INCORRECT_CHECKSUM (zlib header checksum was incorrect)
  */
 int
 isal_read_zlib_header(struct inflate_state *state, struct isal_zlib_header *zlib_hdr);
 
 /**
  * @brief Fast data (deflate) decompression for storage applications.
  *
  * On entry to isal_inflate(), next_in points to an input buffer and avail_in
  * indicates the length of that buffer. Similarly next_out points to an empty
  * output buffer and avail_out indicates the size of that buffer.
  *
  * The field total_out starts at 0 and is updated by isal_inflate(). This
  * reflects the total number of bytes written so far.
  *
  * The call to isal_inflate() will take data from the input buffer (updating
  * next_in, avail_in and write a decompressed stream to the output buffer
  * (updating next_out and avail_out). The function returns when the input buffer
  * is empty, the output buffer is full, invalid data is found, or in the case of
  * zlib formatted data if a dictionary is specified. The current state of the
  * decompression on exit can be read from state->block-state.
  *
  * If the crc_flag is set to ISAL_GZIP_NO_HDR the gzip crc of the output is
  * stored in state->crc. Alternatively, if the crc_flag is set to
  * ISAL_ZLIB_NO_HDR the adler32 of the output is stored in state->crc (checksum
  * may not be updated until decompression is complete). When the crc_flag is set
  * to ISAL_GZIP_NO_HDR_VER or ISAL_ZLIB_NO_HDR_VER, the behavior is the same,
  * except the checksum is verified with the checksum after immediately following
  * the deflate data. If the crc_flag is set to ISAL_GZIP or ISAL_ZLIB, the
  * gzip/zlib header is parsed, state->crc is set to the appropriate checksum,
  * and the checksum is verified. If the crc_flag is set to ISAL_DEFLATE
  * (default), then the data is treated as a raw deflate block.
  *
  * The element state->hist_bits has values from 0 to 15, where values of 1 to 15
  * are the log base 2 size of the matching window and 0 is the default with
  * maximum history size.
  *
  * If a dictionary is required, a call to isal_inflate_set_dict will set the
  * dictionary.
  *
  * @param  state Structure holding state information on the compression streams.
  * @return ISAL_DECOMP_OK (if everything is ok),
  *         ISAL_INVALID_BLOCK,
  *         ISAL_NEED_DICT,
  *         ISAL_INVALID_SYMBOL,
  *         ISAL_INVALID_LOOKBACK,
  *         ISAL_INVALID_WRAPPER,
  *         ISAL_UNSUPPORTED_METHOD,
  *         ISAL_INCORRECT_CHECKSUM.
  */
 
 int
 isal_inflate(struct inflate_state *state);
 
 /**
  * @brief Fast data (deflate) stateless decompression for storage applications.
  *
  * Stateless (one shot) decompression routine with a similar interface to
  * isal_inflate() but operates on entire input buffer at one time. Parameter
  * avail_out must be large enough to fit the entire decompressed
  * output. Dictionaries are not supported.
  *
  * @param  state Structure holding state information on the compression streams.
  * @return ISAL_DECOMP_OK (if everything is ok),
  *         ISAL_END_INPUT (if all input was decompressed),
  *         ISAL_NEED_DICT,
  *         ISAL_OUT_OVERFLOW (if output buffer ran out of space),
  *         ISAL_INVALID_BLOCK,
  *         ISAL_INVALID_SYMBOL,
  *         ISAL_INVALID_LOOKBACK,
  *         ISAL_INVALID_WRAPPER,
  *         ISAL_UNSUPPORTED_METHOD,
  *         ISAL_INCORRECT_CHECKSUM.
  */
 int
 isal_inflate_stateless(struct inflate_state *state);
 
 /******************************************************************************/
 /* Other functions */
 /******************************************************************************/
 /**
  * @brief Calculate Adler-32 checksum, runs appropriate version.
  *
  * This function determines what instruction sets are enabled and selects the
  * appropriate version at runtime.
  *
  * @param init: initial Adler-32 value
  * @param buf: buffer to calculate checksum on
  * @param len: buffer length in bytes
  *
  * @returns 32-bit Adler-32 checksum
  */
 uint32_t
 isal_adler32(uint32_t init, const unsigned char *buf, uint64_t len);
 
 #ifdef __cplusplus
 }
 #endif
 #endif /* ifndef _IGZIP_H */

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