hrepack1

Usage

Overview

hrepack copies an HDF file to a new file with/without compression and/or chunking.

Options

FC-iF[0] input

input HDF File

FC-oF[0] output

output HDF File

FC-VF[0]

prints version of the HDF4 library and exits

FC-hF[0]

prints usage information

FC-vF[0]

verbose mode

FC-tF[0] comp_info

compression type: 'comp_info' is a string with the format <object list>:<type of compression><parameters>

<object list> is a comma separated list of object names meaning apply compression only to those objects. '*' means all objects.

<type of compression> can be:

RLE

for RLE compression

HUFF

for Huffman

GZIP

for gzip

JPEG

for JPEG (for images only)

SZIP

for szip

NONE

to uncompress

<parameters> is optional compression info

RLE

no parameter

HUFF

the skip-size

GZIP

the deflation level

JPEG

the quality factor

SZIP

pixels per block, compression mode (NN or EC)

FC-cF[0] chunk_info

apply chunking. chunk_info is a string with the format <object list>:<chunk information>

<object list> is a comma separated list of object names meaning apply chunking only to those objects. '*' means all objects

<chunk information> is the chunk size of each dimension: dim_1 x dim_2 x ... dim_n or NONE, to unchunk a previous chunked object

FC-fF[0] cfile

file with compression information FC-tF[0] and FC-cF[0]

FC-mF[0] size

do not compress objects smaller than size (bytes)

Examples

compresses all objects in the file FCfile1.hdfF[0], using RLE compression

FC
hrepack -v -i file1.hdf -o file2.hdf -t '*:RLE'
      F[0]

applies Skipping Huffman compression with skip factor of 1, for objects /group1/A, /group2/B and C

FC
hrepack -v -i file1.hdf -o file2.hdf -t '/group1/A,/group2/B,C:HUFF 1'
      F[0]

applies RLE compression for object /group1/D.

applies chunking to objects D and E using a chunk size of 10 for the 2 dimensions

FC
hrepack -v -i file1.hdf -o file2.hdf -t '/group1/D:RLE' -c 'D,E:10x10'
      F[0]

uncompresses object A

FC
hrepack -v -i file1.hdf -o file2.hdf -t 'A:NONE'
      F[0]

applies SZIP compression to object A, with parameters 8 and NN

FC
hrepack -v -i file1.hdf -o file2.hdf -t 'A:SZIP 8,NN'
      F[0]

Note: the use of the verbose option -v is recommended