Re: [hylafax-users] Repairing partially received faxes

[Charles Duffy <cduffy@xxxxxxxxxxx>]

Both those patches are already applied to my libtiff installation.

It appears that tif_decodestrip is set correctly (to JBIGDecode), but 
tif_decoderow is at its default value, and for some reason the latter is 
called for here. A stack trace is provided; though there's quite a bit 
missing (I'd want to compile with a lesser optimization level before 
doing much more debugging), it might give something of an idea of which 
code path we headed down before running into this issue.

(gdb) bt
#0  TIFFErrorExt (fd=0x7, module=0x507b10 "fax673.splitaaa.tif", 
fmt=0x2b360da4c588 "%s %s decoding is not implemented") at tif_error.c:64
#1  0x00002b360da227c0 in TIFFNoDecode (tif=0x507840, 
method=0x2b360da4c692 "scanline") at tif_compress.c:77
#2  0x00002b360da48e02 in TIFFReadScanline (tif=0x507840, buf=0x508030, 
row=0, sample=<value optimized out>) at tif_read.c:106
#3  0x0000000000402e19 in cpContig2ContigByRow (in=0x507840, 
out=0x507010, imagelength=1078, imagewidth=<value optimized out>, 
spp=<value optimized out>) at tiffcp.c:765
#4  0x00000000004023fe in tiffcp (in=0x507840, out=0x507010) at tiffcp.c:735
#5  0x00000000004047cd in main (argc=<value optimized out>, 
argv=0x7fff9d1ac588) at tiffcp.c:286
#6  0x00002b360e029374 in __libc_start_main (main=0x404430 <main>, 
argc=8, ubp_av=0x7fff9d1ac588, init=<value optimized out>, fini=<value 
optimized out>, rtld_fini=<value optimized out>, 
stack_end=0x7fff9d1ac578) at libc-start.c:238
#7  0x00000000004014d9 in _start ()
(gdb) print tif->tif_decoderow
$2 = (TIFFCodeMethod) 0x2b360da22820 <_TIFFNoRowDecode>

I'm guessing that my patch needs to be updated to set tif_decodestrip as 
well as tif_decoderow (several other decompressors appear to use the 
same method for both, so I'm presuming that they're compatible in the 
common case); I'm updating it and will report back.


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