20060303a

1 files changed, 181 insertions, 0 deletions

diff --git a/libfreetype/otlbase.c b/libfreetype/otlbase.c
new file mode 100644
index 00000000..614e13c1
--- /dev/null
+++ b/libfreetype/otlbase.c
@@ -0,0 +1,181 @@
+#include "otlbase.h"
+#include "otlcommn.h"
+
+  static void
+  otl_base_coord_validate( OTL_Bytes      table,
+                           OTL_Validator  valid )
+  {
+    OTL_Bytes  p = table;
+    OTL_UInt   format;
+
+    OTL_CHECK( 4 );
+
+    format = OTL_NEXT_USHORT( p );
+    p += 2;
+
+    switch ( format )
+    {
+      case 1:
+        break;
+
+      case 2:
+        OTL_CHECK( 4 );
+        break;
+
+      case 3:
+        OTL_CHECK( 2 );
+        otl_device_table_validate( table + OTL_PEEK_USHORT( p ) );
+        break;
+
+      default:
+        OTL_INVALID_DATA;
+    }
+  }
+
+
+  static void
+  otl_base_tag_list_validate( OTL_Bytes      table,
+                              OTL_Validator  valid )
+  {
+    OTL_Bytes  p = table;
+    OTL_UInt   count;
+
+    OTL_CHECK(2);
+
+    count = OTL_NEXT_USHORT( p );
+    OTL_CHECK( count*4 );
+  }
+
+
+
+  static void
+  otl_base_values_validate( OTL_Bytes      table,
+                            OTL_Validator  valid )
+  {
+    OTL_Bytes  p = table;
+    OTL_UInt   count;
+
+    OTL_CHECK( 4 );
+
+    p    += 2;  /* skip default index */
+    count = OTL_NEXT_USHORT( p );
+
+    OTL_CHECK( count*2 );
+
+    for ( ; count > 0; count-- )
+      otl_base_coord_validate( table + OTL_NEXT_USHORT( p ), valid );
+  }
+
+
+  static void
+  otl_base_minmax_validate( OTL_Bytes      table,
+                            OTL_Validator  valid )
+  {
+    OTL_Bytes  p = table;
+    OTL_UInt   min_coord, max_coord, count;
+
+    OTL_CHECK(6);
+    min_coord = OTL_NEXT_USHORT( p );
+    max_coord = OTL_NEXT_USHORT( p );
+    count     = OTL_NEXT_USHORT( p );
+
+    if ( min_coord )
+      otl_base_coord_validate( table + min_coord, valid );
+
+    if ( max_coord )
+      otl_base_coord_validate( table + max_coord, valid );
+
+    OTL_CHECK( count*8 );
+    for ( ; count > 0; count-- )
+    {
+      p += 4;  /* ignore tag */
+      min_coord = OTL_NEXT_USHORT( p );
+      max_coord = OTL_NEXT_USHORT( p );
+
+      if ( min_coord )
+        otl_base_coord_validate( table + min_coord, valid );
+
+      if ( max_coord )
+        otl_base_coord_validate( table + max_coord, valid );
+    }
+  }
+
+
+  static void
+  otl_base_script_validate( OTL_Bytes      table,
+                            OTL_Validator  valid )
+  {
+    OTL_Bytes  p = table;
+    OTL_UInt   values, default_minmax;
+
+    OTL_CHECK(6);
+
+    values         = OTL_NEXT_USHORT( p );
+    default_minmax = OTL_NEXT_USHORT( p );
+    count          = OTL_NEXT_USHORT( p );
+
+    if ( values )
+      otl_base_values_validate( table + values, valid );
+
+    if ( default_minmax )
+      otl_base_minmax_validate( table + default_minmax, valid );
+
+    OTL_CHECK( count*6 );
+    for ( ; count > 0; count-- )
+    {
+      p += 4;  /* ignore tag */
+      otl_base_minmax_validate( table + OTL_NEXT_USHORT( p ), valid );
+    }
+  }
+
+
+  static void
+  otl_base_script_list_validate( OTL_Bytes      table,
+                                 OTL_Validator  valid )
+  {
+    OTL_Bytes  p = table;
+    OTL_UInt   count;
+
+    OTL_CHECK(2);
+
+    count = OTL_NEXT_USHORT( p );
+    OTL_CHECK(count*6);
+
+    for ( ; count > 0; count-- )
+    {
+      p += 4;  /* ignore script tag */
+      otl_base_script_validate( table + OTL_NEXT_USHORT( p ) );
+    }
+  }
+
+  static void
+  otl_axis_table_validate( OTL_Bytes      table,
+                           OTL_Validator  valid )
+  {
+    OTL_Bytes  p = table;
+    OTL_UInt   tags;
+
+    OTL_CHECK(4);
+
+    tags = OTL_NEXT_USHORT( p );
+    if ( tags )
+      otl_base_tag_list_validate   ( table + tags );
+
+    otl_base_script_list_validate( table + OTL_NEXT_USHORT( p ) );
+  }
+
+
+  OTL_LOCALDEF( void )
+  otl_base_validate( OTL_Bytes      table,
+                     OTL_Validator  valid )
+  {
+    OTL_Bytes p = table;
+
+    OTL_CHECK(6);
+
+    if ( OTL_NEXT_ULONG( p ) != 0x10000UL )
+      OTL_INVALID_DATA;
+
+    otl_axis_table_validate( table + OTL_NEXT_USHORT( p ) );
+    otl_axis_table_validate( table + OTL_NEXT_USHORT( p ) );
+  }
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