common/transformation_null.c

   1 #include <stdio.h>
   2 #include <config.h>
   3
   4 #include "transformation.h"
   5
   6 /*
   7  * Initialize
   8  */
   9 static int
  10 null_initialize(Transformation *xform, int enc)
  11 {
  12         return 0;
  13 }
  14
  15 /*
  16  * Shut down.
  17  */
  18 static int
  19 null_shutdown(Transformation *xform)
  20 {
  21         return 0;
  22 }
  23
  24 /*
  25  * Handle fork.
  26  */
  27 static int
  28 null_startNewTape(Transformation *xform, struct tapebuf *tpbin,
  29         unsigned long *destlen)
  30 {
  31         return 0;
  32 }
  33
  34 /*
  35  * Start slave process.
  36  */
  37 static int
  38 null_startDiskIOProcess(Transformation *xform)
  39 {
  40         return 0;
  41 }
  42
  43 /*
  44  * End slave process.
  45  */
  46 static int
  47 null_endDiskIOProcess(Transformation *xform)
  48 {
  49         return 0;
  50 }
  51
  52 /*
  53  * Compress a buffer.
  54  */
  55 static int
  56 null_compress(Transformation *xform, struct tapebuf *tpbin, unsigned long *destlen,
  57                 const char *src, int srclen)
  58 {
  59         memcpy(tpbin->buf, src, srclen);
  60         *destlen = srclen;
  61
  62         return 1;
  63 }
  64
  65 /*
  66  * Decompress a buffer.
  67  */
  68 static int
  69 null_decompress(Transformation *xform, struct tapebuf *tpbin, unsigned long *destlen,
  70                 const char *src, int srclen, char **reason)
  71 {
  72         memcpy(tpbin->buf, src, srclen);
  73         *destlen = srclen;
  74
  75         return 1;
  76 }
  77
  78 /*
  79  *
  80  */
  81 Transformation transformation_null =
  82 {
  83         0,
  84         NULL,
  85         "null",
  86         0,
  87         &null_initialize,
  88         &null_shutdown,
  89         &null_startNewTape,
  90         &null_startDiskIOProcess,
  91         &null_endDiskIOProcess,
  92         &null_compress,
  93         &null_decompress
  94 };