--- backend/ipp.c.orig	2012-09-07 07:40:49.000000000 +0200
+++ backend/ipp.c	2012-09-07 11:34:59.000000000 +0200
@@ -99,6 +99,7 @@
 					/* Password tries */
 static const char * const pattrs[] =	/* Printer attributes we want */
 {
+  "compression-supported",
   "copies-supported",
   "cups-version",
   "document-format-supported",
@@ -229,6 +230,7 @@
   int		job_id;			/* job-id value */
   ipp_attribute_t *job_sheets;		/* job-media-sheets-completed */
   ipp_attribute_t *job_state;		/* job-state */
+  ipp_attribute_t *compression_sup;	/* compression-supported */
   ipp_attribute_t *copies_sup;		/* copies-supported */
   ipp_attribute_t *cups_version;	/* cups-version */
   ipp_attribute_t *format_sup;		/* document-format-supported */
@@ -245,7 +247,8 @@
 		copies_remaining;	/* Number of copies remaining */
   const char	*content_type,		/* CONTENT_TYPE environment variable */
 		*final_content_type,	/* FINAL_CONTENT_TYPE environment var */
-		*document_format;	/* document-format value */
+		*document_format,	/* document-format value */
+		*compression_format;	/* compression-format value */
   int		fd;			/* File descriptor */
   off_t		bytes = 0;		/* Bytes copied */
   char		buffer[16384];		/* Copy buffer */
@@ -794,6 +797,7 @@
   * copies...
   */
 
+  compression_sup  = NULL;
   copies_sup       = NULL;
   cups_version     = NULL;
   format_sup       = NULL;
@@ -986,6 +990,16 @@
     * Check for supported attributes...
     */
 
+    if ((compression_sup = ippFindAttribute(supported, "compression-supported",
+	                                  IPP_TAG_KEYWORD)) != NULL)
+    {
+      fprintf(stderr, "DEBUG: compression-supported (%d values)\n",
+	      compression_sup->num_values);
+      for (i = 0; i < compression_sup->num_values; i ++)
+	fprintf(stderr, "DEBUG: [%d] = \"%s\"\n", i,
+	        compression_sup->values[i].string.text);
+    }
+
     if ((copies_sup = ippFindAttribute(supported, "copies-supported",
 	                               IPP_TAG_RANGE)) != NULL)
     {
@@ -1202,8 +1216,26 @@
     }
   }
 
-  fprintf(stderr, "DEBUG: final_content_type=\"%s\", document_format=\"%s\"\n",
-          final_content_type, document_format ? document_format : "(null)");
+  compression_format = NULL;
+  if (compression_sup != NULL)
+  {
+    for (i = 0; i < compression_sup->num_values; i ++)
+      if (!_cups_strcasecmp(compression,
+                            compression_sup->values[i].string.text))
+      {
+        compression_format = compression;
+	break;
+      }
+  }
+
+  if (!compression_format)
+  {
+    perror("DEBUG: Requested compression not supported");
+    return (CUPS_BACKEND_FAILED);
+  }
+
+  fprintf(stderr, "DEBUG: final_content_type=\"%s\", document_format=\"%s\", compression=\"%s\"\n",
+          final_content_type, document_format ? document_format : "(null)", compression_format ? compression_format : "none");
 
  /*
   * If the printer does not support HTTP/1.1 (which IPP requires), copy stdin
@@ -1284,7 +1316,7 @@
   while (!job_canceled && validate_job)
   {
     request = new_request(IPP_VALIDATE_JOB, version, uri, argv[2],
-                          monitor.job_name, num_options, options, compression,
+                          monitor.job_name, num_options, options, compression_format,
 			  copies_sup ? copies : 1, document_format, pc,
 			  media_col_sup, doc_handling_sup);
 
@@ -1357,7 +1389,7 @@
     request = new_request((num_files > 1 || create_job) ? IPP_CREATE_JOB :
                                                           IPP_PRINT_JOB,
 			  version, uri, argv[2], monitor.job_name, num_options,
-			  options, compression, copies_sup ? copies : 1,
+			  options, compression_format, copies_sup ? copies : 1,
 			  document_format, pc, media_col_sup, doc_handling_sup);
 
    /*
@@ -1568,6 +1600,10 @@
 	  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_MIMETYPE,
 		       "document-format", NULL, document_format);
 
+	if (compression_format)
+	  ippAddString(request, IPP_TAG_OPERATION, IPP_TAG_KEYWORD,
+		       "compression", NULL, compression_format);
+
 	fprintf(stderr, "DEBUG: Sending file %d using chunking...\n", i + 1);
 	http_status = cupsSendRequest(http, request, resource, 0);
 	if (http_status == HTTP_CONTINUE && request->state == IPP_DATA)