1 files changed, 40 insertions, 0 deletions
diff --git a/libcacard/vcardt.c b/libcacard/vcardt.c
new file mode 100644
index 0000000..9ce4648
--- /dev/null
+++ b/libcacard/vcardt.c
@@ -0,0 +1,40 @@
+#include <stdlib.h>
+#include <string.h>
+#include <glib.h>
+
+#include "libcacard/vcardt.h"
+
+#include "libcacard/vcardt_internal.h"
+
+/* create an ATR with appropriate historical bytes */
+#define ATR_TS_DIRECT_CONVENTION 0x3b
+#define ATR_TA_PRESENT 0x10
+#define ATR_TB_PRESENT 0x20
+#define ATR_TC_PRESENT 0x40
+#define ATR_TD_PRESENT 0x80
+
+unsigned char *vcard_alloc_atr(const char *postfix, int *atr_len)
+{
+    int postfix_len;
+    const char prefix[] = "VCARD_";
+    const char default_postfix[] = "DEFAULT";
+    const int prefix_len = sizeof(prefix) - 1;
+    int total_len;
+    unsigned char *atr;
+
+    if (postfix == NULL) {
+        postfix = default_postfix;
+    }
+    postfix_len = strlen(postfix);
+    total_len = 3 + prefix_len + postfix_len;
+    atr = g_malloc(total_len);
+    atr[0] = ATR_TS_DIRECT_CONVENTION;
+    atr[1] = ATR_TD_PRESENT + prefix_len + postfix_len;
+    atr[2] = 0x00;
+    memcpy(&atr[3], prefix, prefix_len);
+    memcpy(&atr[3 + prefix_len], postfix, postfix_len);
+    if (atr_len) {
+        *atr_len = total_len;
+    }
+    return atr;
+}