Re: no way in LargeObject API to detect short read?

Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> Anyone able to fix this?

here's a hack we've been using in-house (written by Jun Gabayan,
<jgabayan(at)pahv(dot)xerox(dot)com>).

you may not like the style but it's a stab at a solution.
--
Paul M. Aoki / Xerox Palo Alto Research Center / 3333 Coyote Hill Road
aoki(at)acm(dot)org / Computer Science Laboratory / Palo Alto, CA 94304-1314

Index: LargeObject.java
===================================================================
RCS file: /project/placeless/cvsroot/placeless2/src/org/postgresql/largeobject/LargeObject.java,v
retrieving revision 1.1
retrieving revision 1.3
diff -r1.1 -r1.3
64c64,67
<
---
>
> private int pos = 0; //current position
> private int size = 0;
>
85a89,90
> pos = tell();
> size = size();
102a108
> if(fd == 0) return;
105a112
> fd = 0;
118a126,132
> // calculate available data to read to avoid reading pass the end
> // to avoid an exception
> pos = tell();
> int avail = size - pos;
> if(avail == 0) return null;
> if(avail < len) len = avail;
> try {
123c137,141
<
---
> }catch(SQLException se) {
> System.out.println("***LargeObject.read: Caught SQLException: " + se.getMessage());
> return null;
> }
>
157c175
< public void read(byte buf[],int off,int len) throws SQLException
---
> public int read(byte buf[],int off,int len) throws SQLException
159c177,180
< System.arraycopy(read(len),0,buf,off,len);
---
> byte mybuf[] = read(len);
> int sz = (mybuf != null) ? mybuf.length : -1; //must return -1 for end of data
> if(sz > 0) System.arraycopy(mybuf,0,buf,off,sz);
> return sz;