1 files changed, 50 insertions, 106 deletions
diff --git a/common/miscellaneous.c b/common/miscellaneous.c
index f19cc539d..28d3e7a2e 100644
--- a/common/miscellaneous.c
+++ b/common/miscellaneous.c
@@ -415,112 +415,6 @@ decode_c_string (const char *src)
 }
 
 
-/* Check whether (BUF,LEN) is valid header for an OpenPGP compressed
- * packet.  LEN should be at least 6.  */
-static int
-is_openpgp_compressed_packet (const unsigned char *buf, size_t len)
-{
-  int c, ctb, pkttype;
-  int lenbytes;
-
-  ctb = *buf++; len--;
-  if (!(ctb & 0x80))
-    return 0; /* Invalid packet.  */
-
-  if ((ctb & 0x40)) /* New style (OpenPGP) CTB.  */
-    {
-      pkttype = (ctb & 0x3f);
-      if (!len)
-        return 0; /* Expected first length octet missing.  */
-      c = *buf++; len--;
-      if (c < 192)
-        ;
-      else if (c < 224)
-        {
-          if (!len)
-            return 0; /* Expected second length octet missing. */
-        }
-      else if (c == 255)
-        {
-          if (len < 4)
-            return 0; /* Expected length octets missing */
-        }
-    }
-  else /* Old style CTB.  */
-    {
-      pkttype = (ctb>>2)&0xf;
-      lenbytes = ((ctb&3)==3)? 0 : (1<<(ctb & 3));
-      if (len < lenbytes)
-        return 0; /* Not enough length bytes.  */
-    }
-
-  return (pkttype == 8);
-}
-
-
-
-/*
- * Check if the file is compressed.  You need to pass the first bytes
- * of the file as (BUF,BUFLEN).  Returns true if the buffer seems to
- * be compressed.
- */
-int
-is_file_compressed (const byte *buf, unsigned int buflen)
-{
-  int i;
-
-  struct magic_compress_s
-  {
-    byte len;
-    byte extchk;
-    byte magic[5];
-  } magic[] =
-      {
-       { 3, 0, { 0x42, 0x5a, 0x68, 0x00 } }, /* bzip2 */
-       { 3, 0, { 0x1f, 0x8b, 0x08, 0x00 } }, /* gzip */
-       { 4, 0, { 0x50, 0x4b, 0x03, 0x04 } }, /* (pk)zip */
-       { 5, 0, { '%', 'P', 'D', 'F', '-'} }, /* PDF */
-       { 4, 1, { 0xff, 0xd8, 0xff, 0xe0 } }, /* Maybe JFIF */
-       { 5, 2, { 0x89, 'P','N','G', 0x0d} }  /* Likely PNG */
-  };
-
-  if ( buflen < 6 )
-    {
-      return 0;  /* Too short to check - assume uncompressed.  */
-    }
-
-  for ( i = 0; i < DIM (magic); i++ )
-    {
-      if (!memcmp( buf, magic[i].magic, magic[i].len))
-        {
-          switch (magic[i].extchk)
-            {
-            case 0:
-              return 1; /* Is compressed.  */
-            case 1:
-              if (buflen > 11 && !memcmp (buf + 6, "JFIF", 5))
-                return 1; /* JFIF: this likely a compressed JPEG.  */
-              break;
-            case 2:
-              if (buflen > 8
-                  && buf[5] == 0x0a && buf[6] == 0x1a && buf[7] == 0x0a)
-                return 1; /* This is a PNG.  */
-              break;
-            default:
-              break;
-            }
-        }
-    }
-
-  if (buflen >= 6 && is_openpgp_compressed_packet (buf, buflen))
-    {
-      return 1; /* Already compressed.  */
-    }
-
-  return 0;  /* Not detected as compressed.  */
-}
-
-
 /* Try match against each substring of multistr, delimited by | */
 int
 match_multistr (const char *multistr,const char *match)
@@ -793,3 +687,53 @@ parse_compatibility_flags (const char *string, unsigned int *flagvar,
   *flagvar |= result;
   return 0;
 }
+
+
+/* Convert STRING consisting of base64 characters into its binary
+ * representation and store the result in a newly allocated buffer at
+ * R_BUFFER with its length at R_BUFLEN.  If TITLE is NULL a plain
+ * base64 decoding is done.  If it is the empty string the decoder
+ * will skip everything until a "-----BEGIN " line has been seen,
+ * decoding then ends at a "----END " line.  On failure the function
+ * returns an error code and sets R_BUFFER to NULL.  If the decoded
+ * data has a length of 0 a dummy buffer will still be allocated and
+ * the length is set to 0. */
+gpg_error_t
+b64decode (const char *string, const char *title,
+           void **r_buffer, size_t *r_buflen)
+{
+  gpg_error_t err;
+  gpgrt_b64state_t state;
+  size_t nbytes;
+  char *buffer;
+
+  *r_buffer = NULL;
+  *r_buflen = 0;
+
+  buffer = xtrystrdup (string);
+  if (!buffer)
+    return gpg_error_from_syserror();
+
+  state = gpgrt_b64dec_start (title);
+  if (!state)
+    {
+      err = gpg_error_from_syserror ();
+      xfree (buffer);
+      return err;
+    }
+  err = gpgrt_b64dec_proc (state, buffer, strlen (buffer), &nbytes);
+  if (!err)
+    {
+      err = gpgrt_b64dec_finish (state);
+      state = NULL;
+    }
+  if (err)
+    xfree (buffer);
+  else
+    {
+      *r_buffer = buffer;
+      *r_buflen = nbytes;
+    }
+  gpgrt_b64dec_finish (state);  /* Make sure it is released.  */
+  return err;
+}