X-Git-Url: http://git.asbjorn.biz/?a=blobdiff_plain;f=lib%2Faction%2Fassembler.c;fp=lib%2Faction%2Fassembler.c;h=8526e99905fdc866f84e95b577bdc12ab1a465b6;hb=628e5b0c1264d8419cde6e458d09ed266bb1c79d;hp=0000000000000000000000000000000000000000;hpb=4cc2227e383358d13c984a7cfa6e7a920450cf16;p=swftools.git

diff --git a/lib/action/assembler.c b/lib/action/assembler.c
new file mode 100644
index 0000000..8526e99
--- /dev/null
+++ b/lib/action/assembler.c
@@ -0,0 +1,131 @@
+/*
+    Ming, an SWF output library
+    Copyright (C) 2002  Opaque Industries - http://www.opaque.net/
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "assembler.h"
+#include "compile.h"
+#include "action.h"
+
+
+int len;
+Buffer asmBuffer;
+int nLabels;
+
+struct label
+{
+	char *name;
+	int offset;
+};
+
+struct label labels[256];
+
+
+static int
+findLabel(char *label)
+{
+	int i;
+
+	for ( i=0; i<nLabels; ++i )
+	{
+		if ( strcmp(label, labels[i].name) == 0 )
+			return i;
+	}
+
+	return -1;
+}
+
+
+static void
+addLabel(char *label)
+{
+	int i = findLabel(label);
+
+	if ( i == -1 )
+	{
+		labels[nLabels].name = strdup(label);
+		labels[nLabels].offset = len;
+		++nLabels;
+	}
+	else
+		labels[i].offset = len;
+}
+
+
+int
+bufferBranchTarget(Buffer output, char *label)
+{
+	int i = findLabel(label);
+
+	if ( i == -1 )
+	{
+		i = nLabels;
+		addLabel(label);
+	}
+
+	return bufferWriteS16(output, i);
+}
+
+
+void
+bufferPatchTargets(Buffer buffer)
+{
+	int l, i = 0;
+	unsigned char *output = buffer->buffer;
+
+	while ( i < len )
+	{
+		if ( output[i] & 0x80 ) /* then it's a multibyte instruction */
+		{
+			if ( output[i] == SWFACTION_BRANCHALWAYS ||
+					 output[i] == SWFACTION_BRANCHIFTRUE )
+			{
+				int target, offset;
+
+				i += 3; /* plus instruction plus two-byte length */
+
+				target = output[i];
+				offset = labels[target].offset - (i+2);
+				output[i] = offset & 0xff;
+				output[++i] = (offset>>8) & 0xff;
+				++i;
+			}
+			else
+			{
+				++i;
+				l = output[i];
+				++i;
+				l += output[i]<<8;
+
+				i += l+1;
+			}
+		}
+		else
+			++i;
+	}
+}
+
+
+/*
+ * Local variables:
+ * tab-width: 2
+ * c-basic-offset: 2
+ * End:
+ */