int seg_readbuf( btFileSet *fs, kBitSet *writeCache, int piece, int start, char *buf, int len) {
btFile *f;
_int64 addr = ((_int64)piece * fs->blocksize)+start;
int ifile;
if (!bs_isSet(writeCache, piece) && !bs_isSet(&fs->completed, piece))
{
//printf("Attempted to read uncompleted block %d from disk.\n", piece);
return -1;
}
for (ifile=0; ifile < fs->nfiles; ifile++) {
f=fs->file[ifile];
if ( f->start+f->len >= addr &&
f->start < addr + len)
{
/* this file (partly) includes this piece */
int fd = cacheopen( f->path, O_RDONLY, 0);
off_t fpos = addr - f->start;
_int64 rlen;
_int64 beg = 0;
ssize_t res;
if (fd == -1) {
bts_perror(errno, "readbuf.cacheopen");
return -1;
}
if (fpos < 0) {
beg = -fpos;
fpos = 0;
}
rlen = min(f->len - fpos, len - beg);
if (lseek( fd, fpos, SEEK_SET) != fpos) {
bts_perror(errno, "readbuf.read");
return -1;
}
bt_assert( rlen <= fs->blocksize);
res = read(fd, buf+beg, rlen);
if (res != rlen) {
if (res == 0) {
/* EOF */
return -1;
}
bts_perror(errno, "readbuf.read");
return -1;
}
}
}
return 0;
}
int
seg_readbuf( btFileSet *fs, int piece, int start, char *buf, int len) {
btFile *f;
_int64 addr = ((_int64)piece * fs->blocksize)+start;
int ifile;
if (!bs_isSet(&fs->completed, piece)) {
printf("Attempted to read uncompleted block %d from disk.\n", piece);
return -1;
}
for (ifile=0; ifile < fs->nfiles; ifile++) {
f=fs->file[ifile];
if ( f->start+f->len >= addr &&
f->start < addr + len)
{
/* this file (partly) includes this piece */
int fd = cacheopen( f->path, O_RDONLY, 0);
off_t fpos = addr - f->start;
_int64 rlen;
_int64 beg = 0;
ssize_t res;
#if 0
fprintf( stderr, "cacheopen( %s, O_RDONLY)\n", f->path);
#endif
if (fd == -1) {
#if 0
bts_perror(errno, "readbuf.cacheopen");
#endif
return -1;
}
if (fpos < 0) {
beg = -fpos;
fpos = 0;
}
rlen = min(f->len - fpos, len - beg);
if (lseek( fd, fpos, SEEK_SET) != fpos) {
SYSDIE("lseek failed");
return -1;
}
DIE_UNLESS( rlen <= fs->blocksize);
res = read(fd, buf+beg, rlen);
if (res != rlen) {
if (res == 0) {
/* EOF */
return -1;
}
fprintf(stderr, "On file '%s'\n", f->path);
fprintf(stderr, "read( ..., buf[%lld], %lld) = %d\n", beg, rlen, res);
bts_perror(errno, "readbuf.read");
return -1;
}
}
}
return 0;
}
