示例#1
0
文件: afflib.cpp 项目: anhkgg/temu
/* Returns the name and offset of the last segment */
int	af_last_seg(AFFILE *af,char *last_segname,int last_segname_len,int64 *pos)
{
    /* Find the name of the last segment */
    fseeko(af->aseg,0,SEEK_END);
    af_backspace(af);			// back up one segment
    *pos = ftello(af->aseg);	// remember where it is
    last_segname[0] = 0;
    return af_probe_next_seg(af,last_segname,last_segname_len,0,0,0,0);
}
示例#2
0
static int aff_write_ignore(AFFILE *af,size_t bytes)
{
    int64_t startpos = ftello(af->aseg);	// remember start position
    int r = 0;

    if(af_trace) fprintf(af_trace,"aff_write_ignore(%p,%d)\n",af,(int)bytes);

    /* First write the ignore */
    r = aff_write_ignore2(af,bytes);

    /* If the next one is also an ignore,
     * then we should go back and make the ignore_size bigger.
     * We could do this recursively,
     * but it's probably not worth the added complexity.
     */
    char next[AF_MAX_NAME_LEN];
    size_t segsize2=0;
    int count=0;
    while(af_probe_next_seg(af,next,sizeof(next),0,0,&segsize2,1)==0 && next[0]==0 && segsize2>=0){
	count++;
	if(count>10) break;		// something is wrong; just get out.
	//printf("*** next %d segment at %qd len=%d will be deleted\n",count,ftello(af->aseg),segsize2);
	bytes += segsize2;
	fseeko(af->aseg,startpos,SEEK_SET);
	r = aff_write_ignore2(af,bytes);
	if(r!=0) return r;
    }

    /* See if the previous segment is also blank; if so, collapse them */
    fseeko(af->aseg,startpos,SEEK_SET);
    if(af_backspace(af)==0){
	uint64_t prev_segment_loc = ftello(af->aseg);	// remember where we are
	char   prev_segment_name[AF_MAX_NAME_LEN];
	size_t prev_segment_size=0;
	if(af_probe_next_seg(af,prev_segment_name,sizeof(prev_segment_name),0,0,&prev_segment_size,1)==0){
	    //printf("** prev segment name='%s' len=%d\n",prev_segment_name,prev_segment_size);
	    if(prev_segment_name[0]==0){
		bytes += prev_segment_size;
		fseeko(af->aseg,prev_segment_loc,SEEK_SET);
		r = aff_write_ignore2(af,bytes);
		fseeko(af->aseg,prev_segment_loc,SEEK_SET);
	    }
	}
    }

    return(r);
}
示例#3
0
/* Removes the last segment of an AFF file if it is blank.
 * @return 0 for success, -1 for error */
int af_truncate_blank(AFFILE *af)
{
    uint64_t last_loc = ftello(af->aseg);	// remember where we are
    if(af_backspace(af)==0){
	uint64_t backspace_loc = ftello(af->aseg);	// remember where we are
	char   next_segment_name[AF_MAX_NAME_LEN];
	if(af_probe_next_seg(af,next_segment_name,sizeof(next_segment_name),0,0,0,1)==0){
	    if(next_segment_name[0]==0){
		/* Remove it */
		fflush(af->aseg);
		if(ftruncate(fileno(af->aseg),backspace_loc)<0) return -1;
		return 0;
	    }
	}
    }
    fseeko(af->aseg,last_loc,SEEK_SET);	// return to where we were
    return -1;				// say that we couldn't do it. 
}