char *
MDXData (const void *data, unsigned int len, char *buf)
{
MDX_CTX ctx;
MDXInit(&ctx);
MDXUpdate(&ctx,data,len);
return (MDXEnd(&ctx, buf));
}
char *
MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
{
unsigned char buffer[16*1024];
MDX_CTX ctx;
struct stat stbuf;
int fd, readrv, e;
off_t remain;
if (len < 0) {
errno = EINVAL;
return NULL;
}
MDXInit(&ctx);
fd = open(filename, O_RDONLY);
if (fd < 0)
return NULL;
if (ofs != 0) {
errno = 0;
if (lseek(fd, ofs, SEEK_SET) != ofs ||
(ofs == -1 && errno != 0)) {
readrv = -1;
goto error;
}
}
remain = len;
readrv = 0;
while (len == 0 || remain > 0) {
if (len == 0 || remain > sizeof(buffer))
readrv = read(fd, buffer, sizeof(buffer));
else
readrv = read(fd, buffer, remain);
if (readrv <= 0)
break;
MDXUpdate(&ctx, buffer, readrv);
remain -= readrv;
}
error:
e = errno;
close(fd);
errno = e;
if (readrv < 0)
return NULL;
return (MDXEnd(&ctx, buf));
}
char *
MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
{
unsigned char buffer[BUFSIZ];
MDX_CTX ctx;
struct stat stbuf;
int f, i, e;
off_t n;
MDXInit(&ctx);
f = open(filename, O_RDONLY);
if (f < 0)
return 0;
if (fstat(f, &stbuf) < 0)
return 0;
if (ofs > stbuf.st_size)
ofs = stbuf.st_size;
if ((len == 0) || (len > stbuf.st_size - ofs))
len = stbuf.st_size - ofs;
if (lseek(f, ofs, SEEK_SET) < 0)
return 0;
n = len;
i = 0;
while (n > 0) {
if (n > sizeof(buffer))
i = read(f, buffer, sizeof(buffer));
else
i = read(f, buffer, n);
if (i < 0)
break;
MDXUpdate(&ctx, buffer, i);
n -= i;
}
e = errno;
close(f);
errno = e;
if (i < 0)
return 0;
return (MDXEnd(&ctx, buf));
}
