1 files changed, 19 insertions, 5 deletions
diff --git a/src/input/input_pnm.c b/src/input/input_pnm.c
index e30d0e721..35f4ea2d1 100644
--- a/src/input/input_pnm.c
+++ b/src/input/input_pnm.c
@@ -43,9 +43,11 @@
 #include "pnm.h"
 #include "net_buf_ctrl.h"
 
-
+/*
 #define LOG
+*/
 
+#define BUFSIZE 1025
 
 extern int errno;
 
@@ -71,7 +73,7 @@ typedef struct {
 
   nbc_t           *nbc; 
 
-  char             scratch[1025];
+  char             scratch[BUFSIZE];
 
 } pnm_input_plugin_t;
 
@@ -121,11 +123,23 @@ static buf_element_t *pnm_plugin_read_block (input_plugin_t *this_gen,
 }
 
 static off_t pnm_plugin_seek (input_plugin_t *this_gen, off_t offset, int origin) {
-  /*
   pnm_input_plugin_t *this = (pnm_input_plugin_t *) this_gen;
-  */
 
-  return -1;
+  printf ("input_pnm: seek %lld bytes, origin %d\n",
+	  offset, origin);
+
+  /* only realtive forward-seeking is implemented */
+
+  if ((origin == SEEK_CUR) && (offset >= 0)) {
+
+    for (;((int)offset) - BUFSIZE > 0; offset -= BUFSIZE) {
+      this->curpos += pnm_plugin_read (this_gen, this->scratch, BUFSIZE);
+    }
+
+    this->curpos += pnm_plugin_read (this_gen, this->scratch, offset);
+  }
+
+  return this->curpos;
 }
 
 static off_t pnm_plugin_get_length (input_plugin_t *this_gen) {