/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 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. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ #include "H5Zmodule.h" /* This source code file is part of the H5Z module */ #include "H5private.h" /* Generic Functions */ #include "H5ACprivate.h" /* Metadata cache */ #include "H5Eprivate.h" /* Error handling */ #include "H5Iprivate.h" /* IDs */ #include "H5MMprivate.h" /* Memory management */ #include "H5Pprivate.h" /* Property lists */ #include "H5Oprivate.h" /* Object headers */ #include "H5Sprivate.h" /* Dataspaces */ #include "H5Tprivate.h" /* Datatypes */ #include "H5Zpkg.h" /* Data filters */ /* Struct of parameters needed for compressing/decompressing one atomic datatype */ typedef struct { unsigned size; /* datatype size */ uint32_t minbits; /* minimum bits to compress one value of such datatype */ unsigned mem_order; /* current memory endianness order */ } parms_atomic; enum H5Z_scaleoffset_t {t_bad=0, t_uchar=1, t_ushort, t_uint, t_ulong, t_ulong_long, t_schar, t_short, t_int, t_long, t_long_long, t_float, t_double}; /* Local function prototypes */ static htri_t H5Z_can_apply_scaleoffset(hid_t dcpl_id, hid_t type_id, hid_t space_id); static enum H5Z_scaleoffset_t H5Z_scaleoffset_get_type(unsigned dtype_class, unsigned dtype_size, unsigned dtype_sign); static herr_t H5Z_scaleoffset_set_parms_fillval(H5P_genplist_t *dcpl_plist, H5T_t *type, enum H5Z_scaleoffset_t scale_type, unsigned cd_values[], int need_convert, hid_t dxpl_id); static herr_t H5Z_set_local_scaleoffset(hid_t dcpl_id, hid_t type_id, hid_t space_id); static size_t H5Z_filter_scaleoffset(unsigned flags, size_t cd_nelmts, const unsigned cd_values[], size_t nbytes, size_t *buf_size, void **buf); static void H5Z_scaleoffset_convert(void *buf, unsigned d_nelmts, unsigned dtype_size); static H5_ATTR_CONST unsigned H5Z_scaleoffset_log2(unsigned long long num); static void H5Z_scaleoffset_precompress_i(void *data, unsigned d_nelmts, enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[], uint32_t *minbits, unsigned long long *minval); static void H5Z_scaleoffset_postdecompress_i(void *data, unsigned d_nelmts, enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[], uint32_t minbits, unsigned long long minval); static herr_t H5Z_scaleoffset_precompress_fd(void *data, unsigned d_nelmts, enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[], uint32_t *minbits, unsigned long long *minval, double D_val); static herr_t H5Z_scaleoffset_postdecompress_fd(void *data, unsigned d_nelmts, enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[], uint32_t minbits, unsigned long long minval, double D_val); static void H5Z_scaleoffset_next_byte(size_t *j, unsigned *buf_len); static void H5Z_scaleoffset_decompress_one_byte(unsigned char *data, size_t data_offset, unsigned k, unsigned begin_i, unsigned char *buffer, size_t *j, unsigned *buf_len, parms_atomic p, unsigned dtype_len); static void H5Z_scaleoffset_compress_one_byte(unsigned char *data, size_t data_offset, unsigned k, unsigned begin_i, unsigned char *buffer, size_t *j, unsigned *buf_len, parms_atomic p, unsigned dtype_len); static void H5Z_scaleoffset_decompress_one_atomic(unsigned char *data, size_t data_offset, unsigned char *buffer, size_t *j, unsigned *buf_len, parms_atomic p); static void H5Z_scaleoffset_compress_one_atomic(unsigned char *data, size_t data_offset, unsigned char *buffer, size_t *j, unsigned *buf_len, parms_atomic p); static void H5Z_scaleoffset_decompress(unsigned char *data, unsigned d_nelmts, unsigned char *buffer, parms_atomic p); static void H5Z_scaleoffset_compress(unsigned char *data, unsigned d_nelmts, unsigned char *buffer, size_t buffer_size, parms_atomic p); /* This message derives from H5Z */ H5Z_class2_t H5Z_SCALEOFFSET[1] = {{ H5Z_CLASS_T_VERS, /* H5Z_class_t version */ H5Z_FILTER_SCALEOFFSET, /* Filter id number */ 1, /* Assume encoder present: check before registering */ 1, /* decoder_present flag (set to true) */ "scaleoffset", /* Filter name for debugging */ H5Z_can_apply_scaleoffset, /* The "can apply" callback */ H5Z_set_local_scaleoffset, /* The "set local" callback */ H5Z_filter_scaleoffset, /* The actual filter function */ }}; /* Local macros */ #define H5Z_SCALEOFFSET_TOTAL_NPARMS 20 /* Total number of parameters for filter */ #define H5Z_SCALEOFFSET_PARM_SCALETYPE 0 /* "User" parameter for scale type */ #define H5Z_SCALEOFFSET_PARM_SCALEFACTOR 1 /* "User" parameter for scale factor */ #define H5Z_SCALEOFFSET_PARM_NELMTS 2 /* "Local" parameter for number of elements in the chunk */ #define H5Z_SCALEOFFSET_PARM_CLASS 3 /* "Local" parameter for datatype class */ #define H5Z_SCALEOFFSET_PARM_SIZE 4 /* "Local" parameter for datatype size */ #define H5Z_SCALEOFFSET_PARM_SIGN 5 /* "Local" parameter for integer datatype sign */ #define H5Z_SCALEOFFSET_PARM_ORDER 6 /* "Local" parameter for datatype byte order */ #define H5Z_SCALEOFFSET_PARM_FILAVAIL 7 /* "Local" parameter for dataset fill value existence */ #define H5Z_SCALEOFFSET_PARM_FILVAL 8 /* "Local" parameter for start location to store dataset fill value */ #define H5Z_SCALEOFFSET_CLS_INTEGER 0 /* Integer (datatype class) */ #define H5Z_SCALEOFFSET_CLS_FLOAT 1 /* Floatig-point (datatype class) */ #define H5Z_SCALEOFFSET_SGN_NONE 0 /* Unsigned integer type */ #define H5Z_SCALEOFFSET_SGN_2 1 /* Two's complement signed integer type */ #define H5Z_SCALEOFFSET_ORDER_LE 0 /* Little endian (datatype byte order) */ #define H5Z_SCALEOFFSET_ORDER_BE 1 /* Big endian (datatype byte order) */ #define H5Z_SCALEOFFSET_FILL_UNDEFINED 0 /* Fill value is not defined */ #define H5Z_SCALEOFFSET_FILL_DEFINED 1 /* Fill value is defined */ /* Store fill value in cd_values[] */ #define H5Z_scaleoffset_save_filval(type, cd_values, fill_val) \ { \ unsigned _i = H5Z_SCALEOFFSET_PARM_FILVAL; /* index into cd_values */ \ uint32_t _cd_value; /* Current cd_value */ \ char *_fv_p; /* Pointer to current byte in fill_val */ \ size_t _copy_size = 4; /* # of bytes to copy this iteration */ \ size_t _size_rem = sizeof(type); /* # of bytes left to copy to cd_values */ \ \ /* Store the fill value as the last entry in cd_values[] \ * Store byte by byte from least significant byte to most significant byte \ * Plenty of space left for the fill value (from index 8 to 19) \ * H5O_pline_encode will byte-swap each individual cd value, but we still \ * need to swap the cd values as a whole if we are on a BE machine. Note \ * that we need to make sure to put the data only in the lowest 4 bytes of \ * each, if sizeof(unsigned) > 4. \ */ \ if(H5T_native_order_g == H5T_ORDER_LE) { \ _fv_p = (char *)&(fill_val); \ /* Copy 4 bytes at a time to each cd value */ \ do { \ if(_size_rem < 4) { \ /* Amount left to copy is smaller than a cd_value, adjust copy \ * size and initialize cd_value as it will not be fully \ * overwritten */ \ _copy_size = _size_rem; \ _cd_value = (uint32_t)0; \ } /* end if */ \ \ /* Copy the value */ \ HDmemcpy(&_cd_value, _fv_p, _copy_size); \ (cd_values)[_i] = (unsigned)_cd_value; \ \ /* Next field */ \ _i++; \ _fv_p += _copy_size; \ _size_rem -= _copy_size; \ } while(_size_rem); \ } /* end if */ \ else { \ HDassert(H5T_native_order_g == H5T_ORDER_BE); \ \ /* Copy 4 bytes at a time to each cd value, but start at the end \ * (highest address) of fill_val */ \ _fv_p = ((char *)&(fill_val)) + sizeof(type) - MIN(4, _size_rem); \ while(_size_rem >= 4) { \ /* Copy the value */ \ HDmemcpy(&_cd_value, _fv_p, _copy_size); \ (cd_values)[_i] = (unsigned)_cd_value; \ \ /* Next field */ \ _i++; \ _size_rem -= 4; \ if(_size_rem >= 4) \ _fv_p -= 4; \ else \ _fv_p -= _size_rem; \ } /* end while */ \ \ HDassert(_fv_p == (char *)&(fill_val)); \ if(_size_rem) { \ /* Amount left to copy is smaller than a cd_value, initialize \ * _cd_value as it will not be fully overwritten and copy to the end \ * of _cd value as it is BE. */ \ _cd_value = (uint32_t)0; \ HDmemcpy((char *)&_cd_value + 4 - _size_rem, _fv_p, _size_rem); \ (cd_values)[_i] = (unsigned)_cd_value; \ } /* end if */ \ } /* end else */ \ } /* Set the fill value parameter in cd_values[] for unsigned integer type */ #define H5Z_scaleoffset_set_filval_1(type, dcpl_plist, dt, cd_values, need_convert, dxpl_id)\ { \ type fill_val; \ \ /* Get dataset fill value */ \ if(H5P_get_fill_value(dcpl_plist, dt, &fill_val, dxpl_id) < 0) \ HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "unable to get fill value") \ \ if(need_convert) \ H5Z_scaleoffset_convert(&fill_val, 1, sizeof(type)); \ \ H5Z_scaleoffset_save_filval(type, cd_values, fill_val) \ } /* Set the fill value parameter in cd_values[] for signed integer type */ #define H5Z_scaleoffset_set_filval_2(type, dcpl_plist, dt, cd_values, need_convert, dxpl_id)\ { \ type fill_val; \ \ /* Get dataset fill value */ \ if(H5P_get_fill_value(dcpl_plist, dt, &fill_val, dxpl_id) < 0) \ HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "unable to get fill value") \ \ if(need_convert) \ H5Z_scaleoffset_convert(&fill_val, 1, sizeof(type)); \ \ H5Z_scaleoffset_save_filval(unsigned type, cd_values, fill_val) \ } /* Set the fill value parameter in cd_values[] for character integer type */ #define H5Z_scaleoffset_set_filval_3(type, dcpl_plist, dt, cd_values, need_convert, dxpl_id)\ { \ type fill_val; \ \ /* Get dataset fill value */ \ if(H5P_get_fill_value(dcpl_plist, dt, &fill_val, dxpl_id) < 0) \ HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "unable to get fill value") \ \ /* Store the fill value as the last entry in cd_values[] */ \ (cd_values)[H5Z_SCALEOFFSET_PARM_FILVAL] = (unsigned)((unsigned char)fill_val); \ } /* Set the fill value parameter in cd_values[] for floating-point type */ #define H5Z_scaleoffset_set_filval_4(type, dcpl_plist, dt, cd_values, need_convert, dxpl_id)\ { \ type fill_val; \ \ /* Get dataset fill value */ \ if(H5P_get_fill_value(dcpl_plist, dt, &fill_val, dxpl_id) < 0) \ HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "unable to get fill value") \ \ if(need_convert) \ H5Z_scaleoffset_convert(&fill_val, 1, sizeof(type)); \ \ H5Z_scaleoffset_save_filval(type, cd_values, fill_val) \ } /* Get the fill value for integer type */ #define H5Z_scaleoffset_get_filval_1(type, cd_values, fill_val) \ { \ unsigned _i = H5Z_SCALEOFFSET_PARM_FILVAL; /* index into cd_values */ \ uint32_t _cd_value; /* Current cd_value */ \ char *_fv_p; /* Pointer to current byte in fill_val */ \ size_t _copy_size = 4; /* # of bytes to copy this iteration */ \ size_t _size_rem = sizeof(type); /* # of bytes left to copy to filval */ \ \ /* Retrieve the fill value from the last entry in cd_values[] \ * Store byte by byte from least significant byte to most significant byte \ * Plenty of space left for the fill value (from index 8 to 19) \ * H5O_pline_encode will byte-swap each individual cd value, but we still \ * need to swap the cd values as a whole if we are on a BE machine. Note \ * that we need to make sure to put the data only in the lowest 4 bytes of \ * each, if sizeof(unsigned) > 4. \ */ \ if(H5T_native_order_g == H5T_ORDER_LE) { \ _fv_p = (char *)&(fill_val); \ /* Copy 4 bytes at a time to each cd value */ \ do { \ if(_size_rem < 4) \ /* Amount left to copy is smaller than a cd_value, adjust copy \ * size and initialize cd_value as it will not be fully \ * overwritten */ \ _copy_size = _size_rem; \ \ /* Copy the value */ \ _cd_value = (uint32_t)(cd_values)[_i]; \ HDmemcpy(_fv_p, &_cd_value, _copy_size); \ \ /* Next field */ \ _i++; \ _fv_p += _copy_size; \ _size_rem -= _copy_size; \ } while(_size_rem); \ } /* end if */ \ else { \ HDassert(H5T_native_order_g == H5T_ORDER_BE); \ \ /* Copy 4 bytes at a time to each cd value, but start at the end \ * (highest address) of fill_val */ \ _fv_p = ((char *)&(fill_val)) + sizeof(type) - MIN(4, _size_rem); \ while(_size_rem >= 4) { \ /* Copy the value */ \ _cd_value = (uint32_t)(cd_values)[_i]; \ HDmemcpy(_fv_p, &_cd_value, _copy_size); \ \ /* Next field */ \ _i++; \ _size_rem -= 4; \ if(_size_rem >=4) \ _fv_p -= 4; \ else \ _fv_p -= _size_rem; \ } /* end while */ \ \ HDassert(_fv_p == (char *)&(fill_val)); \ if(_size_rem) { \ /* Amount left to copy is smaller than a cd_value, initialize \ * _cd_value as it will not be fully overwritten and copy to the end \ * of _cd value as it is BE. */ \ _cd_value = (uint32_t)(cd_values)[_i]; \ HDmemcpy(_fv_p, (char *)&_cd_value + 4 - _size_rem, _size_rem); \ } /* end if */ \ } /* end else */ \ } /* Get the fill value for floating-point type */ #define H5Z_scaleoffset_get_filval_2(type, cd_values, filval) \ { \ if(sizeof(type) <= sizeof(long long)) \ H5Z_scaleoffset_get_filval_1(type, cd_values, filval) \ else \ HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot find matched integer dataype") \ } /* Find maximum and minimum values of a buffer with fill value defined for integer type */ #define H5Z_scaleoffset_max_min_1(i, d_nelmts, buf, filval, max, min)\ { \ i = 0; while(i < d_nelmts && buf[i]== filval) i++; \ if(i < d_nelmts) min = max = buf[i]; \ for(; i < d_nelmts; i++) { \ if(buf[i] == filval) continue; /* ignore fill value */ \ if(buf[i] > max) max = buf[i]; \ if(buf[i] < min) min = buf[i]; \ } \ } /* Find maximum and minimum values of a buffer with fill value undefined */ #define H5Z_scaleoffset_max_min_2(i, d_nelmts, buf, max, min)\ { \ min = max = buf[0]; \ for(i = 0; i < d_nelmts; i++) { \ if(buf[i] > max) max = buf[i]; \ if(buf[i] < min) min = buf[i]; \ } \ } /* Find maximum and minimum values of a buffer with fill value defined for floating-point type */ #define H5Z_scaleoffset_max_min_3(i, d_nelmts, buf, filval, max, min, D_val) \ { \ i = 0; while(i < d_nelmts && HDfabs(buf[i] - filval) < HDpow(10.0f, -D_val)) i++; \ if(i < d_nelmts) min = max = buf[i]; \ for(; i < d_nelmts; i++) { \ if(HDfabs(buf[i] - filval) < HDpow(10.0f, -D_val)) \ continue; /* ignore fill value */ \ if(buf[i] > max) max = buf[i]; \ if(buf[i] < min) min = buf[i]; \ } \ } /* Find minimum value of a buffer with fill value defined for integer type */ #define H5Z_scaleoffset_min_1(i, d_nelmts, buf, filval, min) \ { \ i = 0; while(i < d_nelmts && buf[i]== filval) i++; \ if(i < d_nelmts) min = buf[i]; \ for(; i < d_nelmts; i++) { \ if(buf[i] == filval) continue; /* ignore fill value */ \ if(buf[i] < min) min = buf[i]; \ } \ } /* Find minimum value of a buffer with fill value undefined */ #define H5Z_scaleoffset_min_2(i, d_nelmts, buf, min)\ { \ min = buf[0]; \ for(i = 0; i < d_nelmts; i++) \ if(buf[i] < min) min = buf[i]; \ } /* Check and handle special situation for unsigned integer type */ #define H5Z_scaleoffset_check_1(type, max, min, minbits) \ { \ if(max - min > (type)(~(type)0 - 2)) \ { *minbits = sizeof(type)*8; return; } \ } /* Check and handle special situation for signed integer type */ #define H5Z_scaleoffset_check_2(type, max, min, minbits) \ { \ if((unsigned type)(max - min) > (unsigned type)(~(unsigned type)0 - 2)) \ { *minbits = sizeof(type)*8; return; } \ } /* Check and handle special situation for floating-point type */ #define H5Z_scaleoffset_check_3(i, type, pow_fun, round_fun, max, min, minbits, D_val) \ { \ if(sizeof(type) == sizeof(int)) { \ if(round_fun(max * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)) \ > pow_fun(2.0f, (type)(sizeof(int) * 8 - 1))) { \ *minbits = sizeof(int) * 8; \ goto done; \ } \ } else if(sizeof(type) == sizeof(long)) { \ if(round_fun(max * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)) \ > pow_fun(2.0f, (type)(sizeof(long) * 8 - 1))) { \ *minbits = sizeof(long) * 8; \ goto done; \ } \ } else if(sizeof(type) == sizeof(long long)) { \ if(round_fun(max * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)) \ > pow_fun(2.0f, (type)(sizeof(long long) * 8 - 1))) { \ *minbits = sizeof(long long) * 8; \ goto done; \ } \ } else \ HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot find matched integer dataype") \ } /* Precompress for unsigned integer type */ #define H5Z_scaleoffset_precompress_1(type, data, d_nelmts, filavail, cd_values, minbits, minval)\ { \ type *buf = (type *)data, min = 0, max = 0, span, filval = 0; \ unsigned i; \ \ if(filavail == H5Z_SCALEOFFSET_FILL_DEFINED) { /* fill value defined */ \ H5Z_scaleoffset_get_filval_1(type, cd_values, filval) \ if(*minbits == H5Z_SO_INT_MINBITS_DEFAULT) { /* minbits not set yet, calculate max, min, and minbits */ \ H5Z_scaleoffset_max_min_1(i, d_nelmts, buf, filval, max, min) \ H5Z_scaleoffset_check_1(type, max, min, minbits) \ span = (type)(max - min + 1); \ *minbits = H5Z_scaleoffset_log2((unsigned long long)(span+1)); \ } else /* minbits already set, only calculate min */ \ H5Z_scaleoffset_min_1(i, d_nelmts, buf, filval, min) \ if(*minbits != sizeof(type)*8) /* change values if minbits != full precision */ \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)((buf[i] == filval) ? (((type)1 << *minbits) - 1) : (buf[i] - min)); \ } else { /* fill value undefined */ \ if(*minbits == H5Z_SO_INT_MINBITS_DEFAULT ) { /* minbits not set yet, calculate max, min, and minbits */ \ H5Z_scaleoffset_max_min_2(i, d_nelmts, buf, max, min) \ H5Z_scaleoffset_check_1(type, max, min, minbits) \ span = (type)(max - min + 1); \ *minbits = H5Z_scaleoffset_log2((unsigned long long)span); \ } else /* minbits already set, only calculate min */ \ H5Z_scaleoffset_min_2(i, d_nelmts, buf, min) \ if(*minbits != sizeof(type)*8) /* change values if minbits != full precision */ \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)(buf[i] - min); \ } \ *minval = min; \ } /* Precompress for signed integer type */ #define H5Z_scaleoffset_precompress_2(type, data, d_nelmts, filavail, cd_values, minbits, minval)\ { \ type *buf = (type *)data, min = 0, max = 0, filval = 0; \ unsigned type span; unsigned i; \ \ if(filavail == H5Z_SCALEOFFSET_FILL_DEFINED) { /* fill value defined */ \ H5Z_scaleoffset_get_filval_1(type, cd_values, filval) \ if(*minbits == H5Z_SO_INT_MINBITS_DEFAULT) { /* minbits not set yet, calculate max, min, and minbits */ \ H5Z_scaleoffset_max_min_1(i, d_nelmts, buf, filval, max, min) \ H5Z_scaleoffset_check_2(type, max, min, minbits) \ span = (unsigned type)(max - min + 1); \ *minbits = H5Z_scaleoffset_log2((unsigned long long)(span + 1)); \ } else /* minbits already set, only calculate min */ \ H5Z_scaleoffset_min_1(i, d_nelmts, buf, filval, min) \ if(*minbits != sizeof(type) * 8) /* change values if minbits != full precision */ \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)((buf[i] == filval) ? (type)(((unsigned type)1 << *minbits) - 1) : (buf[i] - min)); \ } else { /* fill value undefined */ \ if(*minbits == H5Z_SO_INT_MINBITS_DEFAULT ) { /* minbits not set yet, calculate max, min, and minbits */\ H5Z_scaleoffset_max_min_2(i, d_nelmts, buf, max, min) \ H5Z_scaleoffset_check_2(type, max, min, minbits) \ span = (unsigned type)(max - min + 1); \ *minbits = H5Z_scaleoffset_log2((unsigned long long)span); \ } else /* minbits already set, only calculate min */ \ H5Z_scaleoffset_min_2(i, d_nelmts, buf, min) \ if(*minbits != sizeof(type) * 8) /* change values if minbits != full precision */ \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)(buf[i] - min); \ } \ *minval = (unsigned long long)min; \ } /* Modify values of data in precompression if fill value defined for floating-point type */ #define H5Z_scaleoffset_modify_1(i, type, pow_fun, abs_fun, lround_fun, llround_fun, buf, d_nelmts, filval, minbits, min, D_val) \ { \ if(sizeof(type) == sizeof(int)) \ for(i = 0; i < d_nelmts; i++) { \ if(abs_fun(buf[i] - filval) < pow_fun(10.0f, (type)-D_val)) \ *(int *)&buf[i] = (int)(((unsigned int)1 << *minbits) - 1); \ else \ *(int *)&buf[i] = (int)lround_fun(buf[i] * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)); \ } \ else if(sizeof(type) == sizeof(long)) \ for(i = 0; i < d_nelmts; i++) { \ if(abs_fun(buf[i] - filval) < pow_fun(10.0f, (type)-D_val)) \ *(long *)&buf[i] = (long)(((unsigned long)1 << *minbits) - 1); \ else \ *(long *)&buf[i] = lround_fun(buf[i] * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)); \ } \ else if(sizeof(type) == sizeof(long long)) \ for(i = 0; i < d_nelmts; i++) { \ if(abs_fun(buf[i] - filval) < pow_fun(10.0f, (type)-D_val)) \ *(long long *)&buf[i] = (long long)(((unsigned long long)1 << *minbits) - 1); \ else \ *(long long *)&buf[i] = llround_fun(buf[i] * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)); \ } \ else \ HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot find matched integer dataype") \ } /* Modify values of data in precompression if fill value undefined for floating-point type */ #define H5Z_scaleoffset_modify_2(i, type, pow_fun, lround_fun, llround_fun, buf, d_nelmts, min, D_val) \ { \ if(sizeof(type) == sizeof(int)) \ for(i = 0; i < d_nelmts; i++) \ *(int *)&buf[i] = (int)lround_fun(buf[i] * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)); \ else if(sizeof(type) == sizeof(long)) \ for(i = 0; i < d_nelmts; i++) \ *(long *)&buf[i] = lround_fun(buf[i] * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)); \ else if(sizeof(type) == sizeof(long long)) \ for(i = 0; i < d_nelmts; i++) \ *(long long *)&buf[i] = llround_fun(buf[i] * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)); \ else \ HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot find matched integer dataype") \ } /* Save the minimum value for floating-point type */ #define H5Z_scaleoffset_save_min(i, type, minval, min) \ { \ if(sizeof(type) <= sizeof(long long)) \ /* Save min value to corresponding position \ * byte-order will be swapped as appropriate, but be sure to \ * account for offset in BE if sizes differ \ */ \ if(H5T_native_order_g == H5T_ORDER_LE) \ HDmemcpy(minval, &min, sizeof(type)); \ else { \ HDassert(H5T_native_order_g == H5T_ORDER_BE); \ HDmemcpy(((char *)minval) + (sizeof(long long) - sizeof(type)), \ &min, sizeof(type)); \ } /* end else */ \ else \ HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot find matched integer dataype") \ } /* Precompress for floating-point type using variable-minimum-bits method */ #define H5Z_scaleoffset_precompress_3(type, pow_fun, abs_fun, round_fun, lround_fun, llround_fun, data, d_nelmts, filavail, cd_values, \ minbits, minval, D_val) \ { \ type *buf = (type *)data, min = 0, max = 0, filval = 0; \ unsigned long long span; \ unsigned i; \ \ *minval = 0; \ if(filavail == H5Z_SCALEOFFSET_FILL_DEFINED) { /* fill value defined */ \ H5Z_scaleoffset_get_filval_2(type, cd_values, filval) \ H5Z_scaleoffset_max_min_3(i, d_nelmts, buf, filval, max, min, D_val) \ H5Z_scaleoffset_check_3(i, type, pow_fun, round_fun, max, min, minbits, D_val) \ span = (unsigned long long)(llround_fun(max * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)) + 1); \ *minbits = H5Z_scaleoffset_log2(span + 1); \ if(*minbits != sizeof(type) * 8) /* change values if minbits != full precision */ \ H5Z_scaleoffset_modify_1(i, type, pow_fun, abs_fun, lround_fun, llround_fun, buf, d_nelmts, filval, minbits, min, D_val) \ } else { /* fill value undefined */ \ H5Z_scaleoffset_max_min_2(i, d_nelmts, buf, max, min) \ H5Z_scaleoffset_check_3(i, type, pow_fun, round_fun, max, min, minbits, D_val) \ span = (unsigned long long)(llround_fun(max * pow_fun(10.0f, (type)D_val) - min * pow_fun(10.0f, (type)D_val)) + 1); \ *minbits = H5Z_scaleoffset_log2(span); \ if(*minbits != sizeof(type) * 8) /* change values if minbits != full precision */ \ H5Z_scaleoffset_modify_2(i, type, pow_fun, lround_fun, llround_fun, buf, d_nelmts, min, D_val) \ } \ H5Z_scaleoffset_save_min(i, type, minval, min) \ } /* Postdecompress for unsigned integer type */ #define H5Z_scaleoffset_postdecompress_1(type, data, d_nelmts, filavail, cd_values, minbits, minval)\ { \ type *buf = (type *)data, filval = 0; unsigned i; \ \ if(filavail == H5Z_SCALEOFFSET_FILL_DEFINED) { /* fill value defined */ \ H5Z_scaleoffset_get_filval_1(type, cd_values, filval) \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)((buf[i] == (((type)1 << minbits) - 1)) ? filval : (buf[i] + minval)); \ } else /* fill value undefined */ \ for(i = 0; i < d_nelmts; i++) buf[i] = (type)(buf[i] + (type)(minval)); \ } /* Postdecompress for signed integer type */ #define H5Z_scaleoffset_postdecompress_2(type, data, d_nelmts, filavail, cd_values, minbits, minval)\ { \ type *buf = (type *)data, filval = 0; \ unsigned i; \ \ if(filavail == H5Z_SCALEOFFSET_FILL_DEFINED) { /* fill value defined */ \ H5Z_scaleoffset_get_filval_1(type, cd_values, filval) \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)(((unsigned type)buf[i] == (((unsigned type)1 << minbits) - 1)) ? filval : (buf[i] + minval));\ } else /* fill value undefined */ \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)(buf[i] + (type)(minval)); \ } /* Retrive minimum value of floating-point type */ #define H5Z_scaleoffset_get_min(type, minval, min) \ { \ if(sizeof(type) <= sizeof(long long)) \ /* retrieve min value from corresponding position \ * byte-order has already been swapped as appropriate, but be sure to \ * account for offset in BE if sizes differ \ */ \ if(H5T_native_order_g == H5T_ORDER_LE) \ HDmemcpy(&min, &minval, sizeof(type)); \ else { \ HDassert(H5T_native_order_g == H5T_ORDER_BE); \ HDmemcpy(&min, ((char *)&minval) + (sizeof(long long) \ - sizeof(type)), sizeof(type)); \ } /* end else */ \ else \ HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot find matched integer dataype") \ } /* Modify values of data in postdecompression if fill value defined for floating-point type */ #define H5Z_scaleoffset_modify_3(i, type, pow_fun, buf, d_nelmts, filval, minbits, min, D_val) \ { \ if(sizeof(type) == sizeof(int)) \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)((*(int *)&buf[i] == (int)(((unsigned int)1 << minbits) - 1)) ? \ filval : (type)(*(int *)&buf[i]) / pow_fun(10.0f, (type)D_val) + min); \ else if(sizeof(type) == sizeof(long)) \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)((*(long *)&buf[i] == (long)(((unsigned long)1 << minbits) - 1)) ? \ filval : (type)(*(long *)&buf[i]) / pow_fun(10.0f, (type)D_val) + min); \ else if(sizeof(type) == sizeof(long long)) \ for(i = 0; i < d_nelmts; i++) \ buf[i] = (type)((*(long long *)&buf[i] == (long long)(((unsigned long long)1 << minbits) - 1)) ? \ filval : (type)(*(long long *)&buf[i]) / pow_fun(10.0f, (type)D_val) + min); \ else \ HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot find matched integer dataype") \ } /* Modify values of data in postdecompression if fill value undefined for floating-point type */ #define H5Z_scaleoffset_modify_4(i, type, pow_fun, buf, d_nelmts, min, D_val) \ { \ if(sizeof(type)==sizeof(int)) \ for(i = 0; i < d_nelmts; i++) \ buf[i] = ((type)(*(int *)&buf[i]) / pow_fun(10.0f, (type)D_val) + min); \ else if(sizeof(type)==sizeof(long)) \ for(i = 0; i < d_nelmts; i++) \ buf[i] = ((type)(*(long *)&buf[i]) / pow_fun(10.0f, (type)D_val) + min); \ else if(sizeof(type)==sizeof(long long)) \ for(i = 0; i < d_nelmts; i++) \ buf[i] = ((type)(*(long long *)&buf[i]) / pow_fun(10.0f, (type)D_val) + min); \ else \ HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot find matched integer dataype") \ } /* Postdecompress for floating-point type using variable-minimum-bits method */ #define H5Z_scaleoffset_postdecompress_3(type, pow_fun, data, d_nelmts, filavail, cd_values, \ minbits, minval, D_val) \ { \ type *buf = (type *)data, filval = 0, min = 0; \ unsigned i; \ \ H5Z_scaleoffset_get_min(type, minval, min) \ \ if(filavail == H5Z_SCALEOFFSET_FILL_DEFINED) { /* fill value defined */ \ H5Z_scaleoffset_get_filval_2(type, cd_values, filval) \ H5Z_scaleoffset_modify_3(i, type, pow_fun, buf, d_nelmts, filval, minbits, min, D_val) \ } else /* fill value undefined */ \ H5Z_scaleoffset_modify_4(i, type, pow_fun, buf, d_nelmts, min, D_val) \ } /*------------------------------------------------------------------------- * Function: H5Z_can_apply_scaleoffset * * Purpose: Check the parameters for scaleoffset compression for * validity and whether they fit a particular dataset. * * Return: Success: Non-negative * Failure: Negative * * Programmer: Xiaowen Wu * Friday, February 4, 2005 * * Modifications: * *------------------------------------------------------------------------- */ static htri_t H5Z_can_apply_scaleoffset(hid_t H5_ATTR_UNUSED dcpl_id, hid_t type_id, hid_t H5_ATTR_UNUSED space_id) { const H5T_t *type; /* Datatype */ H5T_class_t dtype_class; /* Datatype's class */ H5T_order_t dtype_order; /* Datatype's endianness order */ htri_t ret_value = TRUE; /* Return value */ FUNC_ENTER_NOAPI_NOINIT /* Get datatype */ if(NULL == (type = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE))) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype") /* Get datatype's class, for checking the "datatype class" */ if((dtype_class = H5T_get_class(type, TRUE)) == H5T_NO_CLASS) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype class") /* Get datatype's size, for checking the "datatype size" */ if(H5T_get_size(type) == 0) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype size") if(dtype_class == H5T_INTEGER || dtype_class == H5T_FLOAT) { /* Get datatype's endianness order */ if((dtype_order = H5T_get_order(type)) == H5T_ORDER_ERROR) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "can't retrieve datatype endianness order") /* Range check datatype's endianness order */ if(dtype_order != H5T_ORDER_LE && dtype_order != H5T_ORDER_BE) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FALSE, "bad datatype endianness order") } else HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FALSE, "datatype class not supported by scaleoffset") done: FUNC_LEAVE_NOAPI(ret_value) } /* end H5Z_can_apply_scaleoffset() */ /*------------------------------------------------------------------------- * Function: H5Z_scaleoffset_get_type * * Purpose: Get the specific integer type based on datatype size and sign * or floating-point type based on size * * Return: Success: id number of integer type * Failure: 0 * * Programmer: Xiaowen Wu * Wednesday, April 13, 2005 * * Modifications: * *------------------------------------------------------------------------- */ static enum H5Z_scaleoffset_t H5Z_scaleoffset_get_type(unsigned dtype_class, unsigned dtype_size, unsigned dtype_sign) { enum H5Z_scaleoffset_t type = t_bad; /* integer type */ enum H5Z_scaleoffset_t ret_value = t_bad; /* Return value */ FUNC_ENTER_NOAPI_NOINIT if(dtype_class==H5Z_SCALEOFFSET_CLS_INTEGER) { if(dtype_sign==H5Z_SCALEOFFSET_SGN_NONE) { /* unsigned integer */ if (dtype_size == sizeof(unsigned char)) type = t_uchar; else if(dtype_size == sizeof(unsigned short)) type = t_ushort; else if(dtype_size == sizeof(unsigned int)) type = t_uint; else if(dtype_size == sizeof(unsigned long)) type = t_ulong; #if H5_SIZEOF_LONG != H5_SIZEOF_LONG_LONG else if(dtype_size == sizeof(unsigned long long)) type = t_ulong_long; #endif /* H5_SIZEOF_LONG != H5_SIZEOF_LONG_LONG */ else HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, t_bad, "cannot find matched memory dataype") } if(dtype_sign==H5Z_SCALEOFFSET_SGN_2) { /* signed integer */ if (dtype_size == sizeof(signed char)) type = t_schar; else if(dtype_size == sizeof(short)) type = t_short; else if(dtype_size == sizeof(int)) type = t_int; else if(dtype_size == sizeof(long)) type = t_long; #if H5_SIZEOF_LONG != H5_SIZEOF_LONG_LONG else if(dtype_size == sizeof(long long)) type = t_long_long; #endif /* H5_SIZEOF_LONG != H5_SIZEOF_LONG_LONG */ else HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, t_bad, "cannot find matched memory dataype") } } if(dtype_class==H5Z_SCALEOFFSET_CLS_FLOAT) { if(dtype_size == sizeof(float)) type = t_float; else if(dtype_size == sizeof(double)) type = t_double; else HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, t_bad, "cannot find matched memory dataype") } /* Set return value */ ret_value = type; done: FUNC_LEAVE_NOAPI(ret_value) } /*------------------------------------------------------------------------- * Function: H5Z_scaleoffset_set_parms_fillval * * Purpose: Get the fill value of the dataset and store in cd_values[] * * Return: Success: Non-negative * Failure: Negative * * Programmer: Xiaowen Wu * Monday, March 7, 2005 * *------------------------------------------------------------------------- */ static herr_t H5Z_scaleoffset_set_parms_fillval(H5P_genplist_t *dcpl_plist, H5T_t *type, enum H5Z_scaleoffset_t scale_type, unsigned cd_values[], int need_convert, hid_t dxpl_id) { herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI_NOINIT if(scale_type == t_uchar) H5Z_scaleoffset_set_filval_3(unsigned char, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_ushort) H5Z_scaleoffset_set_filval_1(unsigned short, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_uint) H5Z_scaleoffset_set_filval_1(unsigned int, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_ulong) H5Z_scaleoffset_set_filval_1(unsigned long, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_ulong_long) H5Z_scaleoffset_set_filval_1(unsigned long long, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_schar) H5Z_scaleoffset_set_filval_3(signed char, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_short) H5Z_scaleoffset_set_filval_2(short, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_int) H5Z_scaleoffset_set_filval_2(int, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_long) H5Z_scaleoffset_set_filval_2(long, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_long_long) H5Z_scaleoffset_set_filval_2(long long, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_float) H5Z_scaleoffset_set_filval_4(float, dcpl_plist, type, cd_values, need_convert, dxpl_id) else if(scale_type == t_double) H5Z_scaleoffset_set_filval_4(double, dcpl_plist, type, cd_values, need_convert, dxpl_id) done: FUNC_LEAVE_NOAPI(ret_value) } /* end H5Z_scaleoffset_set_parms_fillval() */ /*------------------------------------------------------------------------- * Function: H5Z_set_local_scaleoffset * * Purpose: Set the "local" dataset parameters for scaleoffset * compression. * * Return: Success: Non-negative * Failure: Negative * * Programmer: Xiaowen Wu * Friday, February 4, 2005 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5Z_set_local_scaleoffset(hid_t dcpl_id, hid_t type_id, hid_t space_id) { H5P_genplist_t *dcpl_plist; /* Property list pointer */ H5T_t *type; /* Datatype */ const H5S_t *ds; /* Dataspace */ unsigned flags; /* Filter flags */ size_t cd_nelmts = H5Z_SCALEOFFSET_USER_NPARMS; /* Number of filter parameters */ unsigned cd_values[H5Z_SCALEOFFSET_TOTAL_NPARMS]; /* Filter parameters */ hssize_t npoints; /* Number of points in the dataspace */ H5T_class_t dtype_class; /* Datatype's class */ H5T_order_t dtype_order; /* Datatype's endianness order */ size_t dtype_size; /* Datatype's size (in bytes) */ H5T_sign_t dtype_sign; /* Datatype's sign */ enum H5Z_scaleoffset_t scale_type; /* Specific datatype */ H5D_fill_value_t status; /* Status of fill value in property list */ herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI_NOINIT /* Get the plist structure */ if(NULL == (dcpl_plist = H5P_object_verify(dcpl_id, H5P_DATASET_CREATE))) HGOTO_ERROR(H5E_ATOM, H5E_BADATOM, FAIL, "can't find object for ID") /* Get datatype */ if(NULL == (type = (H5T_t *)H5I_object_verify(type_id, H5I_DATATYPE))) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a datatype") /* Initialize the parameters to a known state */ HDmemset(cd_values, 0, sizeof(cd_values)); /* Get the filter's current parameters */ if(H5P_get_filter_by_id(dcpl_plist, H5Z_FILTER_SCALEOFFSET, &flags, &cd_nelmts, cd_values, (size_t)0, NULL, NULL) < 0) HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "can't get scaleoffset parameters") /* Get dataspace */ if(NULL == (ds = (H5S_t *)H5I_object_verify(space_id, H5I_DATASPACE))) HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a data space") /* Get total number of elements in the chunk */ if((npoints = H5S_GET_EXTENT_NPOINTS(ds)) < 0) HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "unable to get number of points in the dataspace") /* Set "local" parameter for this dataset's number of elements */ H5_CHECKED_ASSIGN(cd_values[H5Z_SCALEOFFSET_PARM_NELMTS], unsigned, npoints, hssize_t); /* Get datatype's class */ if((dtype_class = H5T_get_class(type, TRUE)) == H5T_NO_CLASS) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype class") /* Set "local" parameter for datatype's class */ switch(dtype_class) { case H5T_INTEGER: cd_values[H5Z_SCALEOFFSET_PARM_CLASS] = H5Z_SCALEOFFSET_CLS_INTEGER; break; case H5T_FLOAT: cd_values[H5Z_SCALEOFFSET_PARM_CLASS] = H5Z_SCALEOFFSET_CLS_FLOAT; break; case H5T_NO_CLASS: case H5T_TIME: case H5T_STRING: case H5T_BITFIELD: case H5T_OPAQUE: case H5T_COMPOUND: case H5T_REFERENCE: case H5T_ENUM: case H5T_VLEN: case H5T_ARRAY: case H5T_NCLASSES: default: HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "datatype class not supported by scaleoffset") } /* end switch */ /* Get datatype's size */ if((dtype_size = H5T_get_size(type)) == 0) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype size") /* Set "local" parameter for datatype size */ H5_CHECK_OVERFLOW(dtype_size, size_t, unsigned); cd_values[H5Z_SCALEOFFSET_PARM_SIZE] = (unsigned)dtype_size; if(dtype_class == H5T_INTEGER) { /* Get datatype's sign */ if((dtype_sign = H5T_get_sign(type)) == H5T_SGN_ERROR) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype sign") /* Set "local" parameter for integer datatype sign */ switch(dtype_sign) { case H5T_SGN_NONE: cd_values[H5Z_SCALEOFFSET_PARM_SIGN] = H5Z_SCALEOFFSET_SGN_NONE; break; case H5T_SGN_2: cd_values[H5Z_SCALEOFFSET_PARM_SIGN] = H5Z_SCALEOFFSET_SGN_2; break; case H5T_SGN_ERROR: case H5T_NSGN: default: HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad integer sign") } /* end switch */ } /* end if */ /* Get datatype's endianness order */ if((dtype_order = H5T_get_order(type)) == H5T_ORDER_ERROR) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "bad datatype endianness order") /* Set "local" parameter for datatype endianness */ switch(dtype_order) { case H5T_ORDER_LE: /* Little-endian byte order */ cd_values[H5Z_SCALEOFFSET_PARM_ORDER] = H5Z_SCALEOFFSET_ORDER_LE; break; case H5T_ORDER_BE: /* Big-endian byte order */ cd_values[H5Z_SCALEOFFSET_PARM_ORDER] = H5Z_SCALEOFFSET_ORDER_BE; 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 */ /* Check whether fill value is defined for dataset */ if(H5P_fill_value_defined(dcpl_plist, &status) < 0) HGOTO_ERROR(H5E_PLINE, H5E_CANTGET, FAIL, "unable to determine if fill value is defined") /* Set local parameter for availability of fill value */ if(status == H5D_FILL_VALUE_UNDEFINED) cd_values[H5Z_SCALEOFFSET_PARM_FILAVAIL] = H5Z_SCALEOFFSET_FILL_UNDEFINED; else { int need_convert = FALSE; /* Flag indicating convertion of byte order */ cd_values[H5Z_SCALEOFFSET_PARM_FILAVAIL] = H5Z_SCALEOFFSET_FILL_DEFINED; /* Check if memory byte order matches dataset datatype byte order */ if(H5T_native_order_g != dtype_order) need_convert = TRUE; /* Before getting fill value, get its type */ if((scale_type = H5Z_scaleoffset_get_type(cd_values[H5Z_SCALEOFFSET_PARM_CLASS], cd_values[H5Z_SCALEOFFSET_PARM_SIZE], cd_values[H5Z_SCALEOFFSET_PARM_SIGN])) == 0) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, FAIL, "cannot use C integer datatype for cast") /* Get dataset fill value and store in cd_values[] */ if(H5Z_scaleoffset_set_parms_fillval(dcpl_plist, type, scale_type, cd_values, need_convert, H5AC_noio_dxpl_id) < 0) HGOTO_ERROR(H5E_PLINE, H5E_CANTSET, FAIL, "unable to set fill value") } /* end else */ /* Modify the filter's parameters for this dataset */ if(H5P_modify_filter(dcpl_plist, H5Z_FILTER_SCALEOFFSET, flags, (size_t)H5Z_SCALEOFFSET_TOTAL_NPARMS, cd_values) < 0) HGOTO_ERROR(H5E_PLINE, H5E_CANTSET, FAIL, "can't set local scaleoffset parameters") done: FUNC_LEAVE_NOAPI(ret_value) } /* end H5Z_set_local_scaleoffset() */ /*------------------------------------------------------------------------- * Function: H5Z_filter_scaleoffset * * Purpose: Implement an I/O filter for storing packed integer * data using scale and offset method. * * Return: Success: Size of buffer filtered * Failure: 0 * * Programmer: Xiaowen Wu * Monday, February 7, 2005 * * Modifications: * *------------------------------------------------------------------------- */ static size_t H5Z_filter_scaleoffset(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 d_nelmts = 0; /* number of data elements in the chunk */ unsigned dtype_class; /* datatype class */ unsigned dtype_sign; /* integer datatype sign */ unsigned filavail; /* flag indicating if fill value is defined or not */ H5Z_SO_scale_type_t scale_type = H5Z_SO_FLOAT_DSCALE;/* scale type */ int scale_factor = 0; /* scale factor */ double D_val = 0.0f; /* decimal scale factor */ uint32_t minbits = 0; /* minimum number of bits to store values */ unsigned long long minval= 0; /* minimum value of input buffer */ enum H5Z_scaleoffset_t type; /* memory type corresponding to dataset datatype */ int need_convert = FALSE; /* flag indicating convertion of byte order */ unsigned char *outbuf = NULL; /* pointer to new output buffer */ unsigned buf_offset = 21; /* buffer offset because of parameters stored in file */ unsigned i; /* index */ parms_atomic p; /* paramters needed for compress/decompress functions */ FUNC_ENTER_NOAPI_NOINIT /* check arguments */ if(cd_nelmts != H5Z_SCALEOFFSET_TOTAL_NPARMS) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid scaleoffset number of paramters") /* Check if memory byte order matches dataset datatype byte order */ switch(H5T_native_order_g) { case H5T_ORDER_LE: /* memory is little-endian byte order */ if(cd_values[H5Z_SCALEOFFSET_PARM_ORDER] == H5Z_SCALEOFFSET_ORDER_BE) need_convert = TRUE; break; case H5T_ORDER_BE: /* memory is big-endian byte order */ if(cd_values[H5Z_SCALEOFFSET_PARM_ORDER] == H5Z_SCALEOFFSET_ORDER_LE) need_convert = TRUE; break; case H5T_ORDER_ERROR: case H5T_ORDER_VAX: case H5T_ORDER_MIXED: case H5T_ORDER_NONE: default: HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, 0, "bad H5T_NATIVE_INT endianness order") } /* end switch */ /* copy filter parameters to local variables */ d_nelmts = cd_values[H5Z_SCALEOFFSET_PARM_NELMTS]; dtype_class = cd_values[H5Z_SCALEOFFSET_PARM_CLASS]; dtype_sign = cd_values[H5Z_SCALEOFFSET_PARM_SIGN]; filavail = cd_values[H5Z_SCALEOFFSET_PARM_FILAVAIL]; scale_factor = (int)cd_values[H5Z_SCALEOFFSET_PARM_SCALEFACTOR]; scale_type = (H5Z_SO_scale_type_t)cd_values[H5Z_SCALEOFFSET_PARM_SCALETYPE]; /* check and assign proper values set by user to related parameters * scale type can be H5Z_SO_FLOAT_DSCALE (0), H5Z_SO_FLOAT_ESCALE (1) or H5Z_SO_INT (other) * H5Z_SO_FLOAT_DSCALE : floating-point type, variable-minimum-bits method, * scale factor is decimal scale factor * H5Z_SO_FLOAT_ESCALE : floating-point type, fixed-minimum-bits method, * scale factor is the fixed minimum number of bits * H5Z_SO_INT : integer type, scale_factor is minimum number of bits */ if(dtype_class==H5Z_SCALEOFFSET_CLS_FLOAT) { /* floating-point type */ if(scale_type!=H5Z_SO_FLOAT_DSCALE && scale_type!=H5Z_SO_FLOAT_ESCALE) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid scale type") } if(dtype_class==H5Z_SCALEOFFSET_CLS_INTEGER) { /* integer type */ if(scale_type!=H5Z_SO_INT) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "invalid scale type") /* if scale_factor is less than 0 for integer, library will reset it to 0 * in this case, library will calculate the minimum-bits */ if(scale_factor < 0) scale_factor = 0; } /* fixed-minimum-bits method is not implemented and is forbidden */ if(scale_type==H5Z_SO_FLOAT_ESCALE) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "E-scaling method not supported") if(scale_type==H5Z_SO_FLOAT_DSCALE) { /* floating-point type, variable-minimum-bits */ D_val = (double)scale_factor; } else { /* integer type, or floating-point type with fixed-minimum-bits method */ if(scale_factor > (int)(cd_values[H5Z_SCALEOFFSET_PARM_SIZE] * 8)) HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, 0, "minimum number of bits exceeds maximum") /* no need to process data */ if(scale_factor == (int)(cd_values[H5Z_SCALEOFFSET_PARM_SIZE] * 8)) { ret_value = *buf_size; goto done; } minbits = (uint32_t)scale_factor; } /* prepare paramters to pass to compress/decompress functions */ p.size = cd_values[H5Z_SCALEOFFSET_PARM_SIZE]; p.mem_order = H5T_native_order_g; /* input; decompress */ if (flags & H5Z_FLAG_REVERSE) { /* retrieve values of minbits and minval from input compressed buffer * retrieve them corresponding to how they are stored during compression */ uint32_t minbits_mask = 0; unsigned long long minval_mask = 0; unsigned minval_size = 0; minbits = 0; for(i = 0; i < 4; i++) { minbits_mask = ((unsigned char *)*buf)[i]; minbits_mask <<= i*8; minbits |= minbits_mask; } /* retrieval of minval takes into consideration situation where sizeof * unsigned long long (datatype of minval) may change from compression * to decompression, only smaller size is used */ minval_size = sizeof(unsigned long long) <= ((unsigned char *)*buf)[4] ? sizeof(unsigned long long) : ((unsigned char *)*buf)[4]; minval = 0; for(i = 0; i < minval_size; i++) { minval_mask = ((unsigned char *)*buf)[5+i]; minval_mask <<= i*8; minval |= minval_mask; } HDassert(minbits <= p.size * 8); p.minbits = minbits; /* calculate size of output buffer after decompression */ size_out = d_nelmts * p.size; /* allocate memory space for decompressed buffer */ if(NULL == (outbuf = (unsigned char *)H5MM_malloc(size_out))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed for scaleoffset decompression") /* special case: minbits equal to full precision */ if(minbits == p.size * 8) { HDmemcpy(outbuf, (unsigned char*)(*buf)+buf_offset, size_out); /* convert to dataset datatype endianness order if needed */ if(need_convert) H5Z_scaleoffset_convert(outbuf, d_nelmts, p.size); *buf = outbuf; outbuf = NULL; *buf_size = size_out; ret_value = size_out; goto done; } /* decompress the buffer if minbits not equal to zero */ if(minbits != 0) H5Z_scaleoffset_decompress(outbuf, d_nelmts, (unsigned char*)(*buf)+buf_offset, p); else { /* fill value is not defined and all data elements have the same value */ for(i = 0; i < size_out; i++) outbuf[i] = 0; } /* before postprocess, get memory type */ if((type = H5Z_scaleoffset_get_type(dtype_class, p.size, dtype_sign)) == 0) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, 0, "cannot use C integer datatype for cast") /* postprocess after decompression */ if(dtype_class==H5Z_SCALEOFFSET_CLS_INTEGER) H5Z_scaleoffset_postdecompress_i(outbuf, d_nelmts, type, filavail, cd_values, minbits, minval); if(dtype_class==H5Z_SCALEOFFSET_CLS_FLOAT) if(scale_type==0) { /* variable-minimum-bits method */ if(H5Z_scaleoffset_postdecompress_fd(outbuf, d_nelmts, type, filavail, cd_values, minbits, minval, D_val)==FAIL) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, 0, "post-decompression failed") } /* after postprocess, convert to dataset datatype endianness order if needed */ if(need_convert) H5Z_scaleoffset_convert(outbuf, d_nelmts, p.size); } /* output; compress */ else { HDassert(nbytes == d_nelmts * p.size); /* before preprocess, convert to memory endianness order if needed */ if(need_convert) H5Z_scaleoffset_convert(*buf, d_nelmts, p.size); /* before preprocess, get memory type */ if((type = H5Z_scaleoffset_get_type(dtype_class, p.size, dtype_sign))==0) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, 0, "cannot use C integer datatype for cast") /* preprocess before compression */ if(dtype_class==H5Z_SCALEOFFSET_CLS_INTEGER) H5Z_scaleoffset_precompress_i(*buf, d_nelmts, type, filavail, cd_values, &minbits, &minval); if(dtype_class==H5Z_SCALEOFFSET_CLS_FLOAT) if(scale_type==0) { /* variable-minimum-bits method */ if(H5Z_scaleoffset_precompress_fd(*buf, d_nelmts, type, filavail, cd_values, &minbits, &minval, D_val)==FAIL) HGOTO_ERROR(H5E_PLINE, H5E_BADTYPE, 0, "pre-compression failed") } HDassert(minbits <= p.size * 8); /* calculate buffer size after compression * minbits and minval are stored in the front of the compressed buffer */ p.minbits = minbits; size_out = buf_offset + nbytes * p.minbits / (p.size * 8) + 1; /* may be 1 larger */ /* allocate memory space for compressed buffer */ if(NULL == (outbuf = (unsigned char *)H5MM_malloc(size_out))) HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, 0, "memory allocation failed for scaleoffset compression") /* store minbits and minval in the front of output compressed buffer * store byte by byte from least significant byte to most significant byte * constant buffer size (21 bytes) is left for these two parameters * 4 bytes for minbits, 1 byte for size of minval, 16 bytes for minval */ for(i = 0; i < 4; i++) ((unsigned char *)outbuf)[i] = (unsigned char)((minbits & ((uint32_t)0xff << i*8)) >> i*8); ((unsigned char *)outbuf)[4] = sizeof(unsigned long long); for(i = 0; i < sizeof(unsigned long long); i++) ((unsigned char *)outbuf)[5+i] = (unsigned char)((minval & ((unsigned long long)0xff << i*8)) >> i*8); /* Zero out remaining, unused bytes */ /* (Looks like an error in the original determination of how many * bytes would be needed for parameters. - QAK, 2010/08/19) */ HDmemset(outbuf + 13, 0, (size_t)8); /* special case: minbits equal to full precision */ if(minbits == p.size * 8) { HDmemcpy(outbuf + buf_offset, *buf, nbytes); *buf = outbuf; outbuf = NULL; *buf_size = size_out; ret_value = buf_offset + nbytes; goto done; } /* compress the buffer if minbits not equal to zero * minbits equal to zero only when fill value is not defined and * all data elements have the same value */ if(minbits != 0) H5Z_scaleoffset_compress((unsigned char *)*buf, d_nelmts, outbuf + buf_offset, size_out - buf_offset, p); } /* free the input buffer */ H5MM_xfree(*buf); /* set return values */ *buf = outbuf; outbuf = NULL; *buf_size = size_out; ret_value = size_out; done: if(outbuf) H5MM_xfree(outbuf); FUNC_LEAVE_NOAPI(ret_value) } /* ============ Scaleoffset Algorithm =============================================== * assume one byte has 8 bit * assume padding bit is 0 * assume size of unsigned char is one byte * assume one data item of certain datatype is stored continously in bytes * atomic datatype is treated on byte basis */ /* change byte order of input buffer either from little-endian to big-endian * or from big-endian to little-endian 2/21/2005 */ static void H5Z_scaleoffset_convert(void *buf, unsigned d_nelmts, unsigned dtype_size) { if(dtype_size > 1) { size_t i, j; unsigned char *buffer, temp; buffer = (unsigned char *)buf; for(i = 0; i < d_nelmts * dtype_size; i += dtype_size) for(j = 0; j < dtype_size / 2; j++) { /* swap pair of bytes */ temp = buffer[i + j]; buffer[i + j] = buffer[i + dtype_size - 1 - j]; buffer[i + dtype_size - 1 - j] = temp; } /* end for */ } /* end if */ } /* end H5Z_scaleoffset_convert() */ /* return ceiling of floating-point log2 function * receive unsigned integer as argument 3/10/2005 */ static unsigned H5Z_scaleoffset_log2(unsigned long long num) { unsigned v = 0; unsigned long long lower_bound = 1; /* is power of 2, largest value <= num */ unsigned long long val = num; while(val >>= 1) { v++; lower_bound <<= 1; } if(num == lower_bound) return v; else return v + 1; } /* precompress for integer type */ static void H5Z_scaleoffset_precompress_i(void *data, unsigned d_nelmts, enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[], uint32_t *minbits, unsigned long long *minval) { if(type == t_uchar) H5Z_scaleoffset_precompress_1(unsigned char, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_ushort) H5Z_scaleoffset_precompress_1(unsigned short, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_uint) H5Z_scaleoffset_precompress_1(unsigned int, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_ulong) H5Z_scaleoffset_precompress_1(unsigned long, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_ulong_long) H5Z_scaleoffset_precompress_1(unsigned long long, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_schar) { signed char *buf = (signed char *)data, min = 0, max = 0, filval = 0; unsigned char span; unsigned i; if(filavail == H5Z_SCALEOFFSET_FILL_DEFINED) { /* fill value defined */ H5Z_scaleoffset_get_filval_1(signed char, cd_values, filval); if(*minbits == H5Z_SO_INT_MINBITS_DEFAULT) { /* minbits not set yet, calculate max, min, and minbits */ H5Z_scaleoffset_max_min_1(i, d_nelmts, buf, filval, max, min) if((unsigned char)(max - min) > (unsigned char)(~(unsigned char)0 - 2)) { *minbits = sizeof(signed char)*8; return; } span = (unsigned char)(max - min + 1); *minbits = H5Z_scaleoffset_log2((unsigned long long)(span+1)); } else /* minbits already set, only calculate min */ H5Z_scaleoffset_min_1(i, d_nelmts, buf, filval, min) if(*minbits != sizeof(signed char)*8) /* change values if minbits != full precision */ for(i = 0; i < d_nelmts; i++) buf[i] = (signed char)((buf[i] == filval) ? (((unsigned char)1 << *minbits) - 1) : (buf[i] - min)); } else { /* fill value undefined */ if(*minbits == H5Z_SO_INT_MINBITS_DEFAULT) { /* minbits not set yet, calculate max, min, and minbits */ H5Z_scaleoffset_max_min_2(i, d_nelmts, buf, max, min) if((unsigned char)(max - min) > (unsigned char)(~(unsigned char)0 - 2)) { *minbits = sizeof(signed char)*8; *minval = (unsigned long long)min; return; } span = (unsigned char)(max - min + 1); *minbits = H5Z_scaleoffset_log2((unsigned long long)span); } else /* minbits already set, only calculate min */ H5Z_scaleoffset_min_2(i, d_nelmts, buf, min) if(*minbits != sizeof(signed char) * 8) /* change values if minbits != full precision */ for(i = 0; i < d_nelmts; i++) buf[i] = (signed char)(buf[i] - min); } *minval = (unsigned long long)min; } else if(type == t_short) H5Z_scaleoffset_precompress_2(short, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_int) H5Z_scaleoffset_precompress_2(int, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_long) H5Z_scaleoffset_precompress_2(long, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_long_long) H5Z_scaleoffset_precompress_2(long long, data, d_nelmts, filavail, cd_values, minbits, minval) } /* postdecompress for integer type */ static void H5Z_scaleoffset_postdecompress_i(void *data, unsigned d_nelmts, enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[], uint32_t minbits, unsigned long long minval) { long long sminval = *(long long*)&minval; /* for signed integer types */ if(type == t_uchar) H5Z_scaleoffset_postdecompress_1(unsigned char, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_ushort) H5Z_scaleoffset_postdecompress_1(unsigned short, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_uint) H5Z_scaleoffset_postdecompress_1(unsigned int, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_ulong) H5Z_scaleoffset_postdecompress_1(unsigned long, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_ulong_long) H5Z_scaleoffset_postdecompress_1(unsigned long long, data, d_nelmts, filavail, cd_values, minbits, minval) else if(type == t_schar) { signed char *buf = (signed char *)data, filval = 0; unsigned i; if(filavail == H5Z_SCALEOFFSET_FILL_DEFINED) { /* fill value defined */ H5Z_scaleoffset_get_filval_1(signed char, cd_values, filval) for(i = 0; i < d_nelmts; i++) buf[i] = (signed char)((buf[i] == (((unsigned char)1 << minbits) - 1)) ? filval : (buf[i] + sminval)); } else /* fill value undefined */ for(i = 0; i < d_nelmts; i++) buf[i] = (signed char)(buf[i] + sminval); } else if(type == t_short) H5Z_scaleoffset_postdecompress_2(short, data, d_nelmts, filavail, cd_values, minbits, sminval) else if(type == t_int) H5Z_scaleoffset_postdecompress_2(int, data, d_nelmts, filavail, cd_values, minbits, sminval) else if(type == t_long) H5Z_scaleoffset_postdecompress_2(long, data, d_nelmts, filavail, cd_values, minbits, sminval) else if(type == t_long_long) H5Z_scaleoffset_postdecompress_2(long long, data, d_nelmts, filavail, cd_values, minbits, sminval) } /* precompress for floating-point type, variable-minimum-bits method success: non-negative, failure: negative 4/15/05 */ static herr_t H5Z_scaleoffset_precompress_fd(void *data, unsigned d_nelmts, enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[], uint32_t *minbits, unsigned long long *minval, double D_val) { herr_t ret_value = SUCCEED; /* Return value */ FUNC_ENTER_NOAPI_NOINIT if(type == t_float) H5Z_scaleoffset_precompress_3(float, HDpowf, HDfabsf, HDroundf, HDlroundf, HDllroundf, data, d_nelmts, filavail, cd_values, minbits, minval, D_val) else if(type == t_double) H5Z_scaleoffset_precompress_3(double, HDpow, HDfabs, HDround, HDlround, HDllround, data, d_nelmts, filavail, cd_values, minbits, minval, D_val) done: FUNC_LEAVE_NOAPI(ret_value) } /* postdecompress for floating-point type, variable-minimum-bits method success: non-negative, failure: negative 4/15/05 */ static herr_t H5Z_scaleoffset_postdecompress_fd(void *data, unsigned d_nelmts, enum H5Z_scaleoffset_t type, unsigned filavail, const unsigned cd_values[], uint32_t minbits, unsigned long long minval, double D_val) { long long sminval = (long long)minval; /* for signed integer types */ herr_t ret_value=SUCCEED; /* Return value */ FUNC_ENTER_NOAPI_NOINIT if(type == t_float) H5Z_scaleoffset_postdecompress_3(float, HDpowf, data, d_nelmts, filavail, cd_values, minbits, sminval, D_val) else if(type == t_double) H5Z_scaleoffset_postdecompress_3(double, HDpow, data, d_nelmts, filavail, cd_values, minbits, sminval, D_val) done: FUNC_LEAVE_NOAPI(ret_value) } static void H5Z_scaleoffset_next_byte(size_t *j, unsigned *buf_len) { ++(*j); *buf_len = 8 * sizeof(unsigned char); } static void H5Z_scaleoffset_decompress_one_byte(unsigned char *data, size_t data_offset, unsigned k, unsigned begin_i, unsigned char *buffer, size_t *j, unsigned *buf_len, parms_atomic p, unsigned dtype_len) { unsigned dat_len; /* dat_len is the number of bits to be copied in each data byte */ unsigned char val; /* value to be copied in each data byte */ /* initialize value and bits of unsigned char to be copied */ val = buffer[*j]; if(k == begin_i) dat_len = 8 - (dtype_len - p.minbits) % 8; else dat_len = 8; if(*buf_len > dat_len) { data[data_offset + k] = (unsigned char)((unsigned)(val >> (*buf_len - dat_len)) & (unsigned)(~((unsigned)~0 << dat_len))); *buf_len -= dat_len; } /* end if */ else { data[data_offset + k] = (unsigned char)((val & ~((unsigned)(~0) << *buf_len)) << (dat_len - *buf_len)); dat_len -= *buf_len; H5Z_scaleoffset_next_byte(j, buf_len); if(dat_len == 0) return; val = buffer[*j]; data[data_offset + k] |= (unsigned char)((unsigned)(val >> (*buf_len - dat_len)) & ~((unsigned)(~0) << dat_len)); *buf_len -= dat_len; } /* end else */ } static void H5Z_scaleoffset_decompress_one_atomic(unsigned char *data, size_t data_offset, unsigned char *buffer, size_t *j, unsigned *buf_len, parms_atomic p) { /* begin_i: the index of byte having first significant bit */ unsigned begin_i; unsigned dtype_len; int k; HDassert(p.minbits > 0); dtype_len = p.size * 8; if(p.mem_order == H5Z_SCALEOFFSET_ORDER_LE) { /* little endian */ begin_i = p.size - 1 - (dtype_len - p.minbits) / 8; for(k = (int)begin_i; k >= 0; k--) H5Z_scaleoffset_decompress_one_byte(data, data_offset, (unsigned)k, begin_i, buffer, j, buf_len, p, dtype_len); } else { /* big endian */ HDassert(p.mem_order == H5Z_SCALEOFFSET_ORDER_BE); begin_i = (dtype_len - p.minbits) / 8; for(k = (int)begin_i; k <= (int)(p.size - 1); k++) H5Z_scaleoffset_decompress_one_byte(data, data_offset, (unsigned)k, begin_i, buffer, j, buf_len, p, dtype_len); } } static void H5Z_scaleoffset_decompress(unsigned char *data, unsigned d_nelmts, unsigned char *buffer, parms_atomic p) { /* i: index of data, j: index of buffer, buf_len: number of bits to be filled in current byte */ size_t i, j; unsigned buf_len; /* must initialize to zeros */ for(i = 0; i < d_nelmts * p.size; i++) data[i] = 0; /* initialization before the loop */ j = 0; buf_len = sizeof(unsigned char) * 8; /* decompress */ for(i = 0; i < d_nelmts; i++) H5Z_scaleoffset_decompress_one_atomic(data, i * p.size, buffer, &j, &buf_len, p); } static void H5Z_scaleoffset_compress_one_byte(unsigned char *data, size_t data_offset, unsigned k, unsigned begin_i, unsigned char *buffer, size_t *j, unsigned *buf_len, parms_atomic p, unsigned dtype_len) { unsigned dat_len; /* dat_len is the number of bits to be copied in each data byte */ unsigned char val; /* value to be copied in each data byte */ /* initialize value and bits of unsigned char to be copied */ val = data[data_offset + k]; if(k == begin_i) dat_len = 8 - (dtype_len - p.minbits) % 8; else dat_len = 8; if(*buf_len > dat_len) { buffer[*j] |= (unsigned char)((val & ~((unsigned)(~0) << dat_len)) << (*buf_len - dat_len)); *buf_len -= dat_len; } else { buffer[*j] |= (unsigned char)((unsigned)(val >> (dat_len - *buf_len)) & ~((unsigned)(~0) << *buf_len)); dat_len -= *buf_len; H5Z_scaleoffset_next_byte(j, buf_len); if(dat_len == 0) return; buffer[*j] = (unsigned char)((val & ~((unsigned)(~0) << dat_len)) << (*buf_len - dat_len)); *buf_len -= dat_len; } /* end else */ } static void H5Z_scaleoffset_compress_one_atomic(unsigned char *data, size_t data_offset, unsigned char *buffer, size_t *j, unsigned *buf_len, parms_atomic p) { /* begin_i: the index of byte having first significant bit */ unsigned begin_i; unsigned dtype_len; int k; HDassert(p.minbits > 0); dtype_len = p.size * 8; if(p.mem_order == H5Z_SCALEOFFSET_ORDER_LE) { /* little endian */ begin_i = p.size - 1 - (dtype_len - p.minbits) / 8; for(k = (int)begin_i; k >= 0; k--) H5Z_scaleoffset_compress_one_byte(data, data_offset, (unsigned)k, begin_i, buffer, j, buf_len, p, dtype_len); } else { /* big endian */ HDassert(p.mem_order == H5Z_SCALEOFFSET_ORDER_BE); begin_i = (dtype_len - p.minbits) / 8; for(k = (int)begin_i; k <= (int)(p.size - 1); k++) H5Z_scaleoffset_compress_one_byte(data, data_offset, (unsigned)k, begin_i, buffer, j, buf_len, p, dtype_len); } } static void H5Z_scaleoffset_compress(unsigned char *data, unsigned d_nelmts, unsigned char *buffer, size_t buffer_size, parms_atomic p) { /* i: index of data, j: index of buffer, buf_len: number of bits to be filled in current byte */ size_t i, j; unsigned buf_len; /* must initialize buffer to be zeros */ for(j = 0; j < buffer_size; j++) buffer[j] = 0; /* initialization before the loop */ j = 0; buf_len = sizeof(unsigned char) * 8; /* compress */ for(i = 0; i < d_nelmts; i++) H5Z_scaleoffset_compress_one_atomic(data, i * p.size, buffer, &j, &buf_len, p); }