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program chunk_examples
implicit none
C
C Parameter declaration.
C
character*14 FILE_NAME
character*11 SDS_NAME
integer RANK
parameter (FILE_NAME = 'SDSchunked.hdf',
+ SDS_NAME = 'ChunkedData',
+ RANK = 2)
integer DFACC_CREATE, DFACC_READ, DFNT_INT16
parameter (DFACC_CREATE = 4,
+ DFACC_READ = 1,
+ DFNT_INT16 = 22)
integer COMP_CODE_NONE
parameter (COMP_CODE_NONE = 0)
C
C This example does not use compression.
C
C To use RLE compression, declare:
C
C integer COMP_CODE_RLE
C parameter (COMP_CODE_RLE = 1)
C
C To use NBIT compression, declare:
C
C integer COMP_CODE_NBIT
C parameter (COMP_CODE_NBIT = 2)
C
C To use Skipping Huffman compression, declare:
C
C integer COMP_CODE_SKPHUFF
C parameter (COMP_CODE_SKPHUFF = 3)
C
C To use GZIP compression, declare:
C
C integer COMP_CODE_DEFLATE
C parameter (COMP_CODE_DEFLATE = 4)
C
C
C Function declaration.
C
integer sfstart, sfcreate, sfendacc, sfend,
+ sfselect, sfsfill, sfschnk, sfwchnk,
+ sfrchnk, sfgichnk, sfwdata, sfrdata,
+ sfscchnk
C
C**** Variable declaration *******************************************
C
integer sd_id, sds_id, sds_index, status
integer dim_sizes(2), origin(2)
integer fill_value, maxcache, new_maxcache, flag
integer start(2), edges(2), stride(2)
integer*2 all_data(4,9)
integer*2 row(3), column(2)
integer*2 chunk_out(2,3)
integer*2 chunk1(2,3),
+ chunk2(2,3),
+ chunk3(2,3),
+ chunk6(2,3)
integer i, j
C
C Compression flag and parameters.
C
integer comp_type, comp_flag, comp_prm(4)
C
C Chunk's dimensions.
C
integer dim_length(2), dim_length_out(2)
C
C Initialize four chunks
C
data chunk1 /6*1/
data chunk2 /6*2/
data chunk3 /6*3/
data chunk6 /6*6/
C
C Initialize row and column arrays.
C
data row /3*4/
data column /2*5/
C
C**** End of variable declaration ************************************
C
C
C Define chunk's dimensions.
C
dim_length(1) = 2
dim_length(2) = 3
C
C Create the file and initialize SD interface.
C
sd_id = sfstart(FILE_NAME, DFACC_CREATE)
C
C Create 4x9 SDS
C
dim_sizes(1) = 4
dim_sizes(2) = 9
sds_id = sfcreate(sd_id, SDS_NAME, DFNT_INT16,
+ RANK, dim_sizes)
C
C Fill SDS array with the fill value.
C
fill_value = 0
status = sfsfill( sds_id, fill_value)
C
C Create chunked SDS.
C
C In this example we do not use compression.
C
C To use RLE compression, initialize comp_type parameter
C before the call to sfschnk function.
C comp_type = COMP_CODE_RLE
C
C To use NBIT, Skipping Huffman, or GZIP compression,
C initialize comp_prm array and comp type parameter
C before call to sfschnk function
C
C NBIT:
C comp_prm(1) = value_of(sign_ext)
C comp_prm(2) = value_of(fill_one)
C comp_prm(3) = value_of(start_bit)
C comp_prm(4) = value_of(bit_len)
C comp_type = COMP_CODE_NBIT
C
C Skipping Huffman:
C comp_prm(1) = value_of(skp_size)
C comp_type = COMP_CODE_SKPHUFF
C
C GZIP:
C comp_prm(1) = value_of(deflate_level)
C comp_type = COMP_CODE_DEFLATE
C
C
comp_type = COMP_CODE_NONE
status = sfschnk(sds_id, dim_length, comp_type, comp_prm)
C
C Set chunk cache to hold maximum 2 chunks.
C
flag = 0
maxcache = 2
new_maxcache = sfscchnk(sds_id, maxcache, flag)
C
C Write chunks using SDwritechunk function.
C Chunks can be written in any order.
C
C Write chunk with the coordinates (1,1).
C
origin(1) = 1
origin(2) = 1
status = sfwchnk(sds_id, origin, chunk1)
C
C Write chunk with the coordinates (1,2).
C
origin(1) = 1
origin(2) = 2
status = sfwchnk(sds_id, origin, chunk3)
C
C Write chunk with the coordinates (2,1).
C
origin(1) = 2
origin(2) = 1
status = sfwchnk(sds_id, origin, chunk2)
C
C Write chunk with the coordinates (2,3).
C
origin(1) = 2
origin(2) = 3
status = sfwchnk(sds_id, origin, chunk6)
C
C Fill second row in the chunk with the coordinates (2,2).
C
start(1) = 3
start(2) = 3
edges(1) = 1
edges(2) = 3
stride(1) = 1
stride(2) = 1
status = sfwdata(sds_id, start, stride, edges, row)
C
C Fill second column in the chunk with the coordinates (1,3).
C
start(1) = 0
start(2) = 7
edges(1) = 2
edges(2) = 1
stride(1) = 1
stride(2) = 1
status = sfwdata(sds_id, start, stride, edges, column)
C
C Terminate access to the data set.
C
status = sfendacc(sds_id)
C
C Terminate access to the SD interface and close the file.
C
status = sfend(sd_id)
C
C Reopen the file and access the first data set.
C
sd_id = sfstart(FILE_NAME, DFACC_READ)
sds_index = 0
sds_id = sfselect(sd_id, sds_index)
C
C Get information about the SDS.
C
status = sfgichnk(sds_id, dim_length_out, comp_flag)
if (comp_flag .eq. 0) then
write(*,*) 'SDS is chunked'
endif
if (comp_flag .eq. 1) then
write(*,*) 'SDS is chunked and compressed'
endif
if (comp_flag .eq. 2) then
write(*,*) 'SDS is chunked and NBIT compressed'
endif
write(*,*) 'Chunks dimensions are ', dim_length_out(1),
+ ' x' ,dim_length_out(2)
C
C Read the whole SDS using sfrdata function and display
C what we have read. The following information will be displayed:
C
C
C SDS is chunked
C Chunks dimensions are 2 x 3
C
C 1 1 1 3 3 3 0 5 0
C 1 1 1 3 3 3 0 5 0
C 2 2 2 0 0 0 6 6 6
C 2 2 2 4 4 4 6 6 6
C
start(1) = 0
start(2) = 0
edges(1) = 4
edges(2) = 9
stride(1) = 1
stride(2) = 1
status = sfrdata(sds_id, start, stride, edges, all_data)
C
C Display the SDS.
C
write(*,*)
do 10 i = 1,4
write(*,*) (all_data(i,j), j=1,9)
10 continue
C
C Read chunks with the coordinates (2,2) and (1,3) and display.
C The following information will be shown:
C
C Chunk (2,2)
C
C 0 0 0
C 4 4 4
C
C Chunk (1,3)
C
C 0 5 0
C 0 5 0
C
origin(1) = 2
origin(2) = 2
status = sfrchnk(sds_id, origin, chunk_out)
write(*,*)
write(*,*) 'Chunk (2,2)'
write(*,*)
do 20 i = 1,2
write(*,*) (chunk_out(i,j), j=1,3)
20 continue
C
origin(1) = 1
origin(2) = 3
status = sfrchnk(sds_id, origin, chunk_out)
write(*,*)
write(*,*) 'Chunk (1,3)'
write(*,*)
do 30 i = 1,2
write(*,*) (chunk_out(i,j), j=1,3)
30 continue
C
C Terminate access to the data set.
C
status = sfendacc(sds_id)
C
C Terminate access to the SD interface and close the file.
C
status = sfend(sd_id)
end
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