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Code Packages

clone-{cat,split}: split and rejoin files using clone_range

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Signed-off-by: Zygo Blaxell <bees@furryterror.org>
This commit is contained in:
Zygo Blaxell 2021-08-31 11:52:41 -04:00
parent 03f45045cf
commit 02008260f7
2 changed files with 70 additions and 0 deletions
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35
src/clone-cat.cc Normal file
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#include "crucible/error.h"
#include "crucible/fd.h"
#include "crucible/fs.h"
using namespace crucible;
using namespace std;
int
main(int argc, char **argv)
{
if (argc <= 2) {
cerr << "Usage: " << argv[0] << " FILE1 FILE2 [...FILEn] > OUTFILE" << endl;
cerr << "Catenates FILE1..FILEN using copy_file_range" << endl;
return EXIT_FAILURE;
}
off_t out_pos = 0;
while (*++argv) {
string filename(*argv);
Fd input_fd = open_or_die(filename, O_RDONLY);
Stat st(input_fd);
off_t len = st.st_size;
cerr << "clone_range(" << filename << ", 0, " << len << ", STDOUT_FILENO, " << out_pos << ")" << flush;
btrfs_clone_range(input_fd, 0, len, STDOUT_FILENO, out_pos);
out_pos += len;
cerr << endl;
}
return EXIT_SUCCESS;
}

35
src/clone-split.cc Normal file
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#include "crucible/error.h"
#include "crucible/fd.h"
#include "crucible/fs.h"
using namespace crucible;
using namespace std;
int
main(int argc, char **argv)
{
if (argc != 3) {
cerr << "Usage: " << argv[0] << " FILE SIZE" << endl;
cerr << "Splits FILE into SIZE-byte pieces using copy_file_range" << endl;
}
string filename(argv[1]);
off_t out_size(stoull(argv[2], 0, 0));
Fd input_fd = open_or_die(filename, O_RDONLY);
Stat st(input_fd);
for (off_t pos = 0; pos < st.st_size; pos += out_size) {
char pos_name[64];
off_t len = min(st.st_size - pos, out_size);
snprintf(pos_name, sizeof(pos_name), "0x%016llx", static_cast<long long>(pos));
string out_name = filename + '.' + pos_name;
cout << out_name << flush;
Fd output_fd = open_or_die(out_name, O_WRONLY | O_EXCL | O_CREAT);
btrfs_clone_range(input_fd, pos, len, output_fd, 0);
cout << endl;
}
return 0;
}