This snippet of code demonstrates how to use DFSReturnFileMappingInfo()
#include <fcntl.h>
#include <nwdfs.h>
#include <nwfileng.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define NO_COMPRESSION
int main( int argc, char* argv[]) {
int handle;
struct FileMapStructure fmap[ 128];
LONG starting_block = 0;
LONG num_of_entries = 0;
LONG total_blocks = 0;
if ( argc != 2) {
printf( "Syntax: %s <filename>", argv[ 0]);
return EXIT_FAILURE;
}
#ifdef NO_COMPRESSION
handle = FEsopen( argv[ 1], O_RDONLY, SH_DENYRW, 0, 0, PrimaryDataStream);
#else
handle = FEsopen( argv[ 1], O_RDONLY, SH_DENYRW, 0, LEAVE_FILE_COMPRESSED_DATA_BIT | ENABLE_IO_ON_COMPRESSED_DATA_BIT, PrimaryDataStream);
#endif
if ( handle == -1) {
perror( "FEsopen");
return EXIT_FAILURE;
}
while ( DFSReturnFileMappingInformation(( LONG) handle, starting_block, &num_of_entries, sizeof( fmap) / sizeof( fmap[ 0]), fmap) == DFSNormalCompletion && num_of_entries != 0) {
LONG i;
printf( "num_of_entries = %lu\n", num_of_entries);
for ( i = 0; i < num_of_entries; ++i) {
total_blocks += fmap[ i].numberOfBlocks;
}
starting_block = fmap[ num_of_entries - 1].fileBlock + fmap[ num_of_entries - 1].numberOfBlocks;
}
printf( "total_blocks = %lu\n", total_blocks);
close( handle);
return EXIT_SUCCESS;
}
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