Example #1
0
char *
MDXData (const void *data, unsigned int len, char *buf)
{
	MDX_CTX ctx;

	MDXInit(&ctx);
	MDXUpdate(&ctx,data,len);
	return (MDXEnd(&ctx, buf));
}
Example #2
0
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));
}
Example #3
0
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));
}