1 files changed, 122 insertions, 0 deletions
diff --git a/potrace/curve.cpp b/potrace/curve.cpp
new file mode 100644
index 0000000..1cb9f03
--- /dev/null
+++ b/potrace/curve.cpp
@@ -0,0 +1,122 @@
+/* Copyright (C) 2001-2007 Peter Selinger.
+ *  This file is part of Potrace. It is free software and it is covered
+ *  by the GNU General Public License. See the file COPYING for details. */
+
+/* $Id: curve.c 147 2007-04-09 00:44:09Z selinger $ */
+/* private part of the path and curve data structures */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <potracelib.h>
+#include <lists.h>
+#include <curve.h>
+
+#define SAFE_MALLOC( var, n, typ ) \
+    if( ( var = (typ*) malloc( (n)* sizeof(typ) ) ) == NULL ) \
+             goto malloc_error
+
+/* ---------------------------------------------------------------------- */
+/* allocate and free path objects */
+
+path_t* path_new( void )
+{
+    path_t*     p    = NULL;
+    privpath_t* priv = NULL;
+
+    SAFE_MALLOC( p, 1, path_t );
+    memset( p, 0, sizeof(path_t) );
+    SAFE_MALLOC( priv, 1, privpath_t );
+    memset( priv, 0, sizeof(privpath_t) );
+    p->priv = priv;
+    return p;
+
+malloc_error:
+    free( p );
+    free( priv );
+    return NULL;
+}
+
+
+/* free the members of the given curve structure. Leave errno unchanged. */
+static void privcurve_free_members( privcurve_t* curve )
+{
+    free( curve->tag );
+    free( curve->c );
+    free( curve->vertex );
+    free( curve->alpha );
+    free( curve->alpha0 );
+    free( curve->beta );
+}
+
+
+/* free a path. Leave errno untouched. */
+void path_free( path_t* p )
+{
+    if( p )
+    {
+        if( p->priv )
+        {
+            free( p->priv->pt );
+            free( p->priv->lon );
+            free( p->priv->sums );
+            free( p->priv->po );
+            privcurve_free_members( &p->priv->curve );
+            privcurve_free_members( &p->priv->ocurve );
+        }
+        free( p->priv );
+        /* do not free p->fcurve ! */
+    }
+    free( p );
+}
+
+
+/* free a pathlist, leaving errno untouched. */
+void pathlist_free( path_t* plist )
+{
+    path_t* p;
+
+    list_forall_unlink( p, plist ) {
+        path_free( p );
+    }
+}
+
+
+/* ---------------------------------------------------------------------- */
+/* initialize and finalize curve structures */
+
+typedef dpoint_t dpoint3_t[3];
+
+/* initialize the members of the given curve structure to size m.
+ *  Return 0 on success, 1 on error with errno set. */
+int privcurve_init( privcurve_t* curve, int n )
+{
+    memset( curve, 0, sizeof(privcurve_t) );
+    curve->n = n;
+    SAFE_MALLOC( curve->tag, n, int );
+    SAFE_MALLOC( curve->c, n, dpoint3_t );
+    SAFE_MALLOC( curve->vertex, n, dpoint_t );
+    SAFE_MALLOC( curve->alpha, n, double );
+    SAFE_MALLOC( curve->alpha0, n, double );
+    SAFE_MALLOC( curve->beta, n, double );
+    return 0;
+
+malloc_error:
+    free( curve->tag );
+    free( curve->c );
+    free( curve->vertex );
+    free( curve->alpha );
+    free( curve->alpha0 );
+    free( curve->beta );
+    return 1;
+}
+
+
+/* copy private to public curve structure */
+void privcurve_to_curve( privcurve_t* pc, potrace_curve_t* c )
+{
+    c->n   = pc->n;
+    c->tag = pc->tag;
+    c->c   = pc->c;
+}