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//------------------------------------------------------------------------------
// gbserialize: serialize a matrix into a blob
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// gbserialize is an interface to GxB_Matrix_serialize.
// Usage:
// blob = gbserialize (A, method)
#include "gb_interface.h"
#define USAGE "usage: blob = GrB.serialize (A, method, level)"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
gb_usage ((nargin >= 1 && nargin <= 3) && nargout <= 1, USAGE) ;
GrB_Matrix A = gb_get_shallow (pargin [0]) ;
bool debug = false ;
GrB_Descriptor desc = NULL ;
if (nargin > 1)
{
// create the descriptor
OK (GrB_Descriptor_new (&desc)) ;
// get the method
int method = GxB_COMPRESSION_DEFAULT ;
int level = 0 ; // use whatever is the default for the method
#define LEN 64
char method_name [LEN+2] ;
gb_mxstring_to_string (method_name, LEN, pargin [1], "method") ;
if (MATCH (method_name, "none"))
{
method = GxB_COMPRESSION_NONE ;
}
else if (MATCH (method_name, "lz4"))
{
method = GxB_COMPRESSION_LZ4 ;
}
else if (MATCH (method_name, "lz4hc"))
{
method = GxB_COMPRESSION_LZ4HC ;
}
else if (MATCH (method_name, "default") || MATCH (method_name, "zstd"))
{
// the default is ZSTD, with level 1
method = GxB_COMPRESSION_ZSTD ;
}
else if (MATCH (method_name, "debug"))
{
// use GrB_Matrix_serializeSize and GrB_Matrix_serialize, just
// for testing
debug = true ;
}
#if 0
// these methods are not yet supported:
else if (MATCH (method_name, "zlib"))
{
method = GxB_COMPRESSION_ZLIB ;
}
else if (MATCH (method_name, "lzo"))
{
method = GxB_COMPRESSION_LZO ;
}
else if (MATCH (method_name, "bzip2"))
{
method = GxB_COMPRESSION_BZIP2 ;
}
else if (MATCH (method_name, "lzss"))
{
method = GxB_COMPRESSION_LZSS ;
}
else if (MATCH (method_name, "intel:lz4"))
{
method = GxB_COMPRESSION_INTEL + GxB_COMPRESSION_LZ4 ;
}
else if (MATCH (method_name, "intel:lz4hc"))
{
method = GxB_COMPRESSION_INTEL + GxB_COMPRESSION_LZ4HC ;
}
else if (MATCH (method_name, "intel:zlib"))
{
method = GxB_COMPRESSION_INTEL + GxB_COMPRESSION_ZLIB ;
}
else if (MATCH (method_name, "intel:lzo"))
{
method = GxB_COMPRESSION_INTEL + GxB_COMPRESSION_LZO ;
}
else if (MATCH (method_name, "intel:bzip2"))
{
method = GxB_COMPRESSION_INTEL + GxB_COMPRESSION_BZIP2 ;
}
else if (MATCH (method_name, "intel:lzss"))
{
method = GxB_COMPRESSION_INTEL + GxB_COMPRESSION_LZSS ;
}
#endif
else
{
ERROR ("unknown method") ;
}
// get the method level
if (nargin > 2)
{
level = (int) mxGetScalar (pargin [2]) ;
}
if (level < 0 || level > 999) level = 0 ;
// set the descriptor
OK (GxB_Desc_set (desc, GxB_COMPRESSION, method + level)) ;
}
//--------------------------------------------------------------------------
// serialize the matrix into the blob
//--------------------------------------------------------------------------
void *blob = NULL ;
GrB_Index blob_size ;
if (debug)
{
// debug GrB_Matrix_serializeSize and GrB_Matrix_serialize
OK (GrB_Matrix_serializeSize (&blob_size, A)) ;
blob = mxMalloc (blob_size) ;
OK (GrB_Matrix_serialize (blob, &blob_size, A)) ;
// shrink the blob to its actual size
blob = mxRealloc (blob, blob_size) ;
}
else
{
// use GxB_Matrix_serialize by default
OK (GxB_Matrix_serialize (&blob, &blob_size, A, desc)) ;
}
OK (GrB_Descriptor_free (&desc)) ;
//--------------------------------------------------------------------------
// free the shallow matrix A
//--------------------------------------------------------------------------
OK (GrB_Matrix_free (&A)) ;
//--------------------------------------------------------------------------
// return the blob to MATLAB as a uint8 dense blobsize-by-1 array
//--------------------------------------------------------------------------
pargout [0] = mxCreateNumericMatrix (0, 1, mxUINT8_CLASS, mxREAL) ;
mxFree (mxGetData (pargout [0])) ;
mxSetData (pargout [0], blob) ;
mxSetM (pargout [0], blob_size) ;
GB_WRAPUP ;
}
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