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r191: warning if CLI index opt diff from prebuilt

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Also added index testing API (moved from main.c to index.c)
This commit is contained in:
Heng Li
2017-07-19 10:25:11 -04:00
parent 4aff301ef4
commit 5c4d040b13
3 changed files with 35 additions and 29 deletions
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index.c
+21
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@@ -1,5 +1,7 @@
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include "kthread.h"
#include "bseq.h"
@@ -399,3 +401,22 @@ mm_idx_t *mm_idx_load(FILE *fp)
fread(mi->S, 4, (sum_len + 7) / 8, fp);
return mi;
}
int mm_idx_is_idx(const char *fn)
{
int fd, is_idx = 0;
off_t ret;
char magic[4];
if (strcmp(fn, "-") == 0) return 0; // read from pipe; not an index
fd = open(fn, O_RDONLY);
if (fd < 0) return -1; // error
if ((ret = lseek(fd, 0, SEEK_END)) >= 4) {
lseek(fd, 0, SEEK_SET);
ret = read(fd, magic, 4);
if (ret == 4 && strncmp(magic, MM_IDX_MAGIC, 4) == 0)
is_idx = 1;
}
close(fd);
return is_idx;
}