Check In tool source code based on Build tool project revision r1655.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8964 6f19259b-4bc3-4df7-8a09-765794883524

BaseTools/Source/C/VfrCompile/Pccts/h/BufFileInput.cpp

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+// FILE:        BufFileInput.cpp
+// AUTHOR:      Alexey Demakov (AVD) demakov@kazbek.ispras.ru
+// CREATION:    26-JAN-1998
+// DESCRIPTION: File Input Stream with lookahead for Scanner.
+//   See file BufFileInput.h for details
+
+// Change History:
+//
+//   22-Jun-1998    assert.h -> PCCTS_ASSERT_H
+//                  string.h -> PCCTS_STRING_H
+//
+//   28-May-1998    Add virtual destructor to release buffer.
+//
+//                  Add dummy definition for ANTLRTokenType
+//                  to allow compilation without knowing
+//                  token type codes.
+//
+//                  Manfred Kogler (km@cast.uni-linz.ac.at)
+//                  (1.33MR14)
+//
+//   20-Jul-1998    MR14a - Reorder initialization list for ctor.
+//
+
+enum ANTLRTokenType {TER_HATES_CPP=0, SO_DO_OTHERS=9999 };
+
+#include "pcctscfg.h"
+#include "pccts_assert.h"
+#include "pccts_string.h"
+
+PCCTS_NAMESPACE_STD
+
+#include "BufFileInput.h"
+
+BufFileInput::BufFileInput( FILE *f, int buf_size )
+: input( f ),
+  buf( new int[buf_size] ),
+  size( buf_size ),
+  start( 0 ),
+  len( 0 )
+{
+}
+
+BufFileInput::~BufFileInput()
+{
+  delete [] buf;
+}
+
+int BufFileInput::nextChar( void )
+{
+    if( len > 0 )
+    {
+        // get char from buffer
+        int c = buf[start];
+
+        if( c != EOF )
+        {
+            start++; start %= size;
+            len--;
+        }
+        return c;
+    } else {
+        // get char from file
+        int c = getc( input );
+
+        if( c == EOF )
+        {
+            // if EOF - put it in the buffer as indicator
+            buf[start] = EOF;
+            len++;
+        }
+        return c;
+    }
+}
+
+int BufFileInput::lookahead( char* s )
+{
+    int l = strlen( s );
+
+    assert( 0 < l && l <= size );
+
+    while( len < l )
+    {
+        int c = getc( input );
+
+        buf[ (start+len) % size ] = c;
+
+        len++;
+
+        if( c == EOF ) return 0;
+    }
+
+    for( int i = 0; i < l; i++ )
+    {
+        if( s[i] != buf[ (start+i) % size ] ) return 0;
+    }
+    return 1;
+}
+
+// End of file BufFileInput.cpp
+