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120 lines
2.8 KiB
120 lines
2.8 KiB
/*
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* Mini Object Storage, (C) 2014 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <sys/param.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <assert.h>
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#include "split.h"
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static
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size_t _get_filesize(int fd)
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{
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struct stat st;
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assert(fstat(fd, &st) != -1);
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return (ssize_t) st.st_size;
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}
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static
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ssize_t read_write_chunk(int in, int out, ssize_t bytes)
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{
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ssize_t n, m;
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char *buf = NULL;
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buf = calloc(bytes, 1);
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assert(buf != NULL);
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n = read(in, buf, bytes);
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if (n < 0)
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return -1;
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m = write(out, buf, n);
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if (m < 0)
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return -1;
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if (buf)
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free(buf);
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return m;
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}
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static int
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_allocate_newchunk(char *chunkname)
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{
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int chunk = -1;
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if (!chunkname)
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return -1;
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if ((strlen(chunkname)) >= MAXPATHLEN) {
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fprintf (stderr, "chunkname + suffix too long");
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return -1;
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}
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chunk = open (chunkname, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
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return chunk;
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}
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/*
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* Generate chunks by chunking at input bytes.
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*/
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int
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minio_split(char *filename, ssize_t bytecnt)
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{
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ssize_t fsize;
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int output = -1;
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int input = -1;
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int remainder = 0;
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char newchunk[MAXPATHLEN] = {0,};
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int chunk_size = 0;
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int i = 0;
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if (bytecnt < 0)
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return -1;
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if ((input = open(filename, O_RDONLY)) < 0)
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return -1;
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fsize = _get_filesize(input);
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remainder = fsize % bytecnt;
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if (remainder == 0)
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chunk_size = fsize / bytecnt;
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else
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chunk_size = (fsize + (bytecnt - remainder)) / bytecnt;
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if (chunk_size == 0)
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return -1;
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for (i = 0; i < chunk_size; i++) {
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snprintf (newchunk, sizeof(newchunk)-1, "%s.%d", filename, i);
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if ((output = _allocate_newchunk(newchunk)) < 0)
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return -1;
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if (read_write_chunk(input, output, bytecnt) < 0)
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return -1;
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}
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return 0;
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}
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