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diff -up cups-1.6b1/scheduler/job.c.filter-debug cups-1.6b1/scheduler/job.c
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--- cups-1.6b1/scheduler/job.c.filter-debug	2012-05-25 16:06:01.000000000 +0200
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+++ cups-1.6b1/scheduler/job.c	2012-05-25 16:07:46.309259511 +0200
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@@ -625,10 +625,28 @@ cupsdContinueJob(cupsd_job_t *job)	/* I
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     if (!filters)
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     {
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+      mime_filter_t *current;
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+
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       cupsdLogJob(job, CUPSD_LOG_ERROR,
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 		  "Unable to convert file %d to printable format.",
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 		  job->current_file);
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+      cupsdLogJob(job, CUPSD_LOG_ERROR,
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+		  "Required: %s/%s -> %s/%s",
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+		  job->filetypes[job->current_file]->super,
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+		  job->filetypes[job->current_file]->type,
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+		  job->printer->filetype->super,
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+		  job->printer->filetype->type);
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+
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+      for (current = (mime_filter_t *)cupsArrayFirst(MimeDatabase->srcs);
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+	   current;
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+	   current = (mime_filter_t *)cupsArrayNext(MimeDatabase->srcs))
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+	  cupsdLogJob(job, CUPSD_LOG_ERROR,
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+		      "Available: %s/%s -> %s/%s (%s)",
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+		      current->src->super, current->src->type,
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+		      current->dst->super, current->dst->type,
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+		      current->filter);
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+
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       abort_message = "Aborting job because it cannot be printed.";
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       abort_state   = IPP_JOB_ABORTED;
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