/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "netcdf_filter_build.h"

#ifdef HAVE_SZ

#include <szlib.h>
#include "H5Zszip.h"

/* Local function prototypes */
static htri_t H5Z___can_apply_szip(hid_t dcpl_id, hid_t type_id, hid_t space_id);
static herr_t H5Z___set_local_szip(hid_t dcpl_id, hid_t type_id, hid_t space_id);
static size_t H5Z___filter_szip(unsigned flags, size_t cd_nelmts,
    const unsigned cd_values[], size_t nbytes, size_t *buf_size, void **buf);

/* This message derives from H5Z */
H5Z_class2_t H5Z_SZIP[1] = {{
    H5Z_CLASS_T_VERS,           /* H5Z_class_t version */
    H5Z_FILTER_SZIP,		/* Filter id number		*/
    1,                          /* Assume encoder present: check before registering */
    1,                          /* decoder_present flag (set to true) */
    "szip",			/* Filter name for debugging	*/
    H5Z___can_apply_szip,	/* The "can apply" callback     */
    H5Z___set_local_szip,        /* The "set local" callback     */
    H5Z___filter_szip,		/* The actual filter function	*/
}};



/*-------------------------------------------------------------------------
 * Function:	H5Z___can_apply_szip
 *
 * Purpose:	Check the parameters for szip compression for validity and
 *              whether they fit a particular dataset.
 *
 * Note:        This function currently range-checks for datatypes with
 *              8-bit boundaries (8, 16, 24, etc.).  It appears that the szip
 *              library can actually handle 1-24, 32 & 64 bit samples.  If
 *              this becomes important, we should make the checks below more
 *              sophisticated and have them check for n-bit datatypes of the
 *              correct size, etc. - QAK
 *
 * Return:	Success: Non-negative
 *		Failure: Negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, April  7, 2003
 *
 *-------------------------------------------------------------------------
 */
static htri_t
H5Z___can_apply_szip(hid_t H5_ATTR_UNUSED dcpl_id, hid_t type_id, hid_t H5_ATTR_UNUSED space_id)
{
    htri_t ret_value = TRUE;            /* Return value */
#ifdef USE_HDF5
    unsigned dtype_size;                /* Datatype's size (in bits) */
    H5T_order_t dtype_order;            /* Datatype's endianness order */

    FUNC_ENTER_STATIC

    /* Get datatype's size, for checking the "bits-per-pixel" */
    if((dtype_size = (8 * H5Tget_size(type_id))) == 0)
        HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype size")

    /* Range check datatype's size */
    if(dtype_size > 32 && dtype_size != 64)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FALSE, "invalid datatype size")

    /* Get datatype's endianness order */
    if((dtype_order = H5Tget_order(type_id)) == H5T_ORDER_ERROR)
        HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "can't retrieve datatype endianness order")

    /* Range check datatype's endianness order */
    /* (Note: this may not handle non-atomic datatypes well) */
    if(dtype_order != H5T_ORDER_LE && dtype_order != H5T_ORDER_BE)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FALSE, "invalid datatype endianness order")

done:
    FUNC_LEAVE_NOAPI(ret_value)
#else /*!USE_HDF5*/
    return ret_value;
#endif /*USE_HDF5*/
} /* end H5Z___can_apply_szip() */


/*-------------------------------------------------------------------------
 * Function:	H5Z___set_local_szip
 *
 * Purpose:	Set the "local" dataset parameters for szip compression.
 *
 * Return:	Success: Non-negative
 *		Failure: Negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, April  7, 2003
 *
 *-------------------------------------------------------------------------
 */

static herr_t
H5Z___set_local_szip(hid_t dcpl_id, hid_t type_id, hid_t space_id)
{
    herr_t ret_value = SUCCEED; /* Return value */

#ifdef USE_HDF5
    unsigned flags;             /* Filter flags */
    size_t cd_nelmts = H5Z_SZIP_USER_NPARMS;     /* Number of filter parameters */
    unsigned cd_values[H5Z_SZIP_TOTAL_NPARMS];  /* Filter parameters */
    hsize_t dims[H5S_MAX_RANK+1];             /* Dataspace (i.e. chunk) dimensions */
    int ndims;                  /* Number of (chunk) dimensions */
    H5T_order_t dtype_order;    /* Datatype's endianness order */
    size_t dtype_size;          /* Datatype's size (in bits) */
    size_t dtype_precision;     /* Datatype's precision (in bits) */
    size_t dtype_offset;        /* Datatype's offset (in bits) */
    hsize_t scanline;           /* Size of dataspace's fastest changing dimension */

    FUNC_ENTER_STATIC

    /* Get the filter's current parameters */
    if(H5Pget_filter_by_id1(dcpl_id, H5Z_FILTER_SZIP, &flags, &cd_nelmts, cd_values, 0, NULL) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't get szip parameters")

    /* Get datatype's size, for checking the "bits-per-pixel" */
    if((dtype_size = (8 * H5Tget_size(type_id))) == 0)
        HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype size");

    /* Get datatype's precision, in case is less than full bits  */
    if((dtype_precision = H5Tget_precision(type_id)) == 0)
        HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype precision");

    if(dtype_precision < dtype_size) {
        dtype_offset = H5Tget_offset(type_id);
        if(dtype_offset != 0)
            dtype_precision = dtype_size;
    } /* end if */
    if(dtype_precision > 24) {
        if(dtype_precision <= 32)
            dtype_precision = 32;
        else if(dtype_precision <= 64)
            dtype_precision = 64;
    } /* end if */

    /* Set "local" parameter for this dataset's "bits-per-pixel" */
    cd_values[H5Z_SZIP_PARM_BPP] = dtype_precision;

    /* Get dimensions for dataspace */
    if((ndims = H5Sget_simple_extent_dims(space_id, dims, NULL)) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "unable to get dataspace dimensions")

    /* Set "local" parameter for this dataset's "pixels-per-scanline" */
    /* (Use the chunk's fastest changing dimension size) */
    HDassert(ndims > 0);
    scanline = dims[ndims - 1];

    /* Adjust scanline if it is smaller than number of pixels per block or
       if it is bigger than maximum pixels per scanline, or there are more than
       SZ_MAX_BLOCKS_PER_SCANLINE blocks per scanline  */

    /* Check the pixels per block against the 'scanline' size */
    if(scanline < cd_values[H5Z_SZIP_PARM_PPB]) {
        hssize_t npoints;                   /* Number of points in the dataspace */

        /* Get number of elements for the dataspace;  use
           total number of elements in the chunk to define the new 'scanline' size */
        if((npoints = H5Sget_simple_extent_npoints(space_id)) < 0)
            HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "unable to get number of points in the dataspace")
        if(npoints < cd_values[H5Z_SZIP_PARM_PPB])
            HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "pixels per block greater than total number of elements in the chunk")
        scanline = MIN((cd_values[H5Z_SZIP_PARM_PPB] * SZ_MAX_BLOCKS_PER_SCANLINE), npoints);
    }
    else {
        if(scanline <= SZ_MAX_PIXELS_PER_SCANLINE)
            scanline = MIN((cd_values[H5Z_SZIP_PARM_PPB] * SZ_MAX_BLOCKS_PER_SCANLINE), scanline);
        else
            scanline = cd_values[H5Z_SZIP_PARM_PPB] * SZ_MAX_BLOCKS_PER_SCANLINE;
    } /* end else */

    /* Assign the final value to the scanline */
    H5_CHECKED_ASSIGN(cd_values[H5Z_SZIP_PARM_PPS], unsigned, scanline, hsize_t);

    /* Get datatype's endianness order */
    if((dtype_order = H5Tget_order(type_id)) == H5T_ORDER_ERROR)
        HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype endianness order")

    /* Set the correct endianness flag for szip */
    /* (Note: this may not handle non-atomic datatypes well) */
    cd_values[H5Z_SZIP_PARM_MASK] &= ~(H5_SZIP_LSB_OPTION_MASK|H5_SZIP_MSB_OPTION_MASK);
    switch(dtype_order) {
        case H5T_ORDER_LE:      /* Little-endian byte order */
            cd_values[H5Z_SZIP_PARM_MASK] |= H5_SZIP_LSB_OPTION_MASK;
            break;

        case H5T_ORDER_BE:      /* Big-endian byte order */
            cd_values[H5Z_SZIP_PARM_MASK] |= H5_SZIP_MSB_OPTION_MASK;
            break;

        case H5T_ORDER_ERROR:
        case H5T_ORDER_VAX:
        case H5T_ORDER_MIXED:
        case H5T_ORDER_NONE:
        default:
            HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype endianness order")
    } /* end switch */

    /* Modify the filter's parameters for this dataset */
    if(H5Pmodify_filter(dcpl_id, H5Z_FILTER_SZIP, flags, H5Z_SZIP_TOTAL_NPARMS, cd_values) < 0)
        HGOTO_ERROR(H5E_PLINE, H5E_CANTSET, FAIL, "can't set local szip parameters")

done:
    FUNC_LEAVE_NOAPI(ret_value)
#else /*!USE_HDF5*/
    return ret_value;
#endif /*USE_HDF5*/
} /* end H5Z___set_local_szip() */


/*-------------------------------------------------------------------------
 * Function:	H5Z___filter_szip
 *
 * Purpose:	Implement an I/O filter around the 'rice' algorithm in
 *              libsz
 *
 * Return:	Success: Size of buffer filtered
 *		Failure: 0
 *
 * Programmer:	Kent Yang
 *              Tuesday, April 1, 2003
 *
 *-------------------------------------------------------------------------
 */
static size_t
H5Z___filter_szip(unsigned flags, size_t cd_nelmts, const unsigned cd_values[],
    size_t nbytes, size_t *buf_size, void **buf)
{
    size_t ret_value = 0;       /* Return value */
    size_t size_out  = 0;       /* Size of output buffer */
    unsigned char *outbuf = NULL;    /* Pointer to new output buffer */
    unsigned char *newbuf = NULL;    /* Pointer to input buffer */
    SZ_com_t sz_param;          /* szip parameter block */

    FUNC_ENTER_STATIC

    /* Sanity check to make certain that we haven't drifted out of date with
     * the mask options from the szlib.h header */
    HDassert(H5_SZIP_ALLOW_K13_OPTION_MASK==SZ_ALLOW_K13_OPTION_MASK);
    HDassert(H5_SZIP_CHIP_OPTION_MASK==SZ_CHIP_OPTION_MASK);
    HDassert(H5_SZIP_EC_OPTION_MASK==SZ_EC_OPTION_MASK);
    HDassert(H5_SZIP_LSB_OPTION_MASK==SZ_LSB_OPTION_MASK);
    HDassert(H5_SZIP_MSB_OPTION_MASK==SZ_MSB_OPTION_MASK);
    HDassert(H5_SZIP_NN_OPTION_MASK==SZ_NN_OPTION_MASK);
    HDassert(H5_SZIP_RAW_OPTION_MASK==SZ_RAW_OPTION_MASK);

    /* Check arguments */
    if (cd_nelmts!=4)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid number of filter parameters")

    /* Copy the filter parameters into the szip parameter block */
    H5_CHECKED_ASSIGN(sz_param.options_mask, int, cd_values[H5Z_SZIP_PARM_MASK], unsigned);
    H5_CHECKED_ASSIGN(sz_param.bits_per_pixel, int, cd_values[H5Z_SZIP_PARM_BPP], unsigned);
    H5_CHECKED_ASSIGN(sz_param.pixels_per_block, int, cd_values[H5Z_SZIP_PARM_PPB], unsigned);
    H5_CHECKED_ASSIGN(sz_param.pixels_per_scanline, int, cd_values[H5Z_SZIP_PARM_PPS], unsigned);

    /* Input; uncompress */
    if (flags & H5Z_FLAG_REVERSE) {
        uint32_t stored_nalloc;  /* Number of bytes the compressed block will expand into */
        size_t nalloc;  /* Number of bytes the compressed block will expand into */

        /* Get the size of the uncompressed buffer */
        newbuf = (unsigned char *)(*buf);
        UINT32DECODE(newbuf,stored_nalloc);
        H5_CHECKED_ASSIGN(nalloc, size_t, stored_nalloc, uint32_t);

        /* Allocate space for the uncompressed buffer */
        if(NULL == (outbuf = (unsigned char *)H5MM_malloc(nalloc)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed for szip decompression")

        /* Decompress the buffer */
        size_out=nalloc;
        if(SZ_BufftoBuffDecompress(outbuf, &size_out, newbuf, nbytes-4, &sz_param) != SZ_OK)
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "szip_filter: decompression failed")
        HDassert(size_out==nalloc);

        /* Free the input buffer */
        H5MM_xfree(*buf);

        /* Set return values */
        *buf = outbuf;
        outbuf = NULL;
        *buf_size = nalloc;
        ret_value = size_out;
    }
    /* Output; compress */
    else {
        unsigned char *dst = NULL;    /* Temporary pointer to new output buffer */

        /* Allocate space for the compressed buffer & header (assume data won't get bigger) */
        if(NULL == (dst=outbuf = (unsigned char *)H5MM_malloc(nbytes+4)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "unable to allocate szip destination buffer")

        /* Encode the uncompressed length */
        H5_CHECK_OVERFLOW(nbytes,size_t,uint32_t);
        UINT32ENCODE(dst,nbytes);

        /* Compress the buffer */
        size_out = nbytes;
        if(SZ_OK!= SZ_BufftoBuffCompress(dst, &size_out, *buf, nbytes, &sz_param))
            HGOTO_ERROR(H5E_PLINE, H5E_CANTINIT, 0, "overflow")
        HDassert(size_out<=nbytes);

        /* Free the input buffer */
        H5MM_xfree(*buf);

        /* Set return values */
        *buf = outbuf;
        outbuf = NULL;
        *buf_size = nbytes+4;
        ret_value = size_out+4;
    }

done:
    if(outbuf)
        H5MM_xfree(outbuf);
    FUNC_LEAVE_NOAPI(ret_value)
}

/* External Discovery Functions */
DLLEXPORT
H5PL_type_t
H5PLget_plugin_type(void)
{
    return H5PL_TYPE_FILTER;
}

DLLEXPORT
const void*
H5PLget_plugin_info(void)
{
    return H5Z_SZIP;
}

#endif /* HAVE_SZ */
