[freetype2] GSoC-2019-moazin 3cbd281: Revert "Performs basic checks to see if SVG data is valid or not."

[Moazin Khatti]

branch: GSoC-2019-moazin
commit 3cbd28117667b99ccc0a1fb8b9c5392451f8bc87
Author: Moazin Khatti <address@hidden>
Commit: Moazin Khatti <address@hidden>

    Revert "Performs basic checks to see if SVG data is valid or not."
    
    This reverts commit e5dc1b65cdc7ea357118fddbdb4b00afc403f81c.
    These aren't necessary.
---
 src/sfnt/ttsvg.c | 38 ++------------------------------------
 1 file changed, 2 insertions(+), 36 deletions(-)

diff --git a/src/sfnt/ttsvg.c b/src/sfnt/ttsvg.c
index 223eb88..f4a85ca 100644
--- a/src/sfnt/ttsvg.c
+++ b/src/sfnt/ttsvg.c
@@ -35,24 +35,6 @@
 
 #include "ttsvg.h"
 
-/* SVG table looks like:
- * --------------------------------------
- * Bytes:         Field                 |
- * --------------------------------------
- * 2              version
- * 4              offsetToSVGDocumentList
- * 4              reserved
- * 2              numEntries (non-zero)
- * 12*numEntries  documentList
- *
- * Since numEntries must be at least one, minimum
- * size of SVG table is 24. Everything apart from
- * the documentList makes 12 bytes.
- */
-
-#define  SVG_HEADER_BASE_SIZE 12
-#define  SVG_HEADER_MIN_SIZE  24
-
   /* TODO: (OT-SVG) Decide whether to add documentation here or not */
 
   typedef struct Svg_
@@ -87,9 +69,6 @@
     if( error )
       goto NoSVG;
 
-    if ( table_size < SVG_HEADER_MIN_SIZE )
-      goto InvalidTable;
-
     if( FT_FRAME_EXTRACT( table_size, table ))
       goto NoSVG;
 
@@ -98,14 +77,7 @@
       goto NoSVG;
 
     p = table;
-    svg->version = FT_NEXT_USHORT( p );
-
-    /* At the time of writing this, only version 0 exists,
-     * and only that is supported by FreeType
-     */
-    if ( svg->version != 0 )
-      goto InvalidTable;
-
+    svg->version =            FT_NEXT_USHORT( p );
     offsetToSVGDocumentList = FT_NEXT_ULONG( p );
 
     if( offsetToSVGDocumentList == 0 )
@@ -116,9 +88,6 @@
     p = svg->svg_doc_list;
     svg->num_entries = FT_NEXT_USHORT( p );
 
-    if ( ( svg->num_entries*12 + SVG_HEADER_BASE_SIZE ) > table_size )
-      goto InvalidTable;
-
     FT_TRACE3(( "version: %d\n", svg->version ));
     FT_TRACE3(( "num entiries: %d\n", svg->num_entries ));
 
@@ -275,10 +244,7 @@
       *doc_length = mid_doc.length;
       *start_glyph = mid_doc.start_glyph_id;
       *end_glyph   = mid_doc.end_glyph_id;
-      if ( *doc_length == 0 )
-        error = FT_THROW( Invalid_SVG_Document );
-      else
-        error = FT_Err_Ok;
+      error = FT_Err_Ok;
     }
     return error;
   }