Split ICU wrapper library into several sources

[yaz-moved-to-github.git] / src / icu_transform.c

diff --git a/src/icu_transform.c b/src/icu_transform.c
new file mode 100644 (file)
index 0000000..10ace94
--- /dev/null
+++ b/src/icu_transform.c
@@ -0,0 +1,140 @@
+/* This file is part of the YAZ toolkit.
+ * Copyright (C) 1995-2009 Index Data
+ * See the file LICENSE for details.
+ */
+
+/**
+ * \file
+ * \brief ICU transforms - using utrans_-functions from ICU
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#if YAZ_HAVE_ICU
+#include <yaz/xmalloc.h>
+
+#include <yaz/icu_I18N.h>
+
+#include <yaz/log.h>
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include <unicode/utrans.h>
+
+struct icu_transform
+{
+    char action;
+    UParseError parse_error;
+    UTransliterator * trans;
+};
+
+struct icu_transform * icu_transform_create(const char *id, char action,
+                                            const char *rules, 
+                                            UErrorCode *status)
+{
+    struct icu_buf_utf16 *id16 = icu_buf_utf16_create(0);
+    struct icu_buf_utf16 *rules16 = icu_buf_utf16_create(0);
+
+    struct icu_transform *transform
+        = (struct icu_transform *) xmalloc(sizeof(struct icu_transform));
+
+    transform->action = action;
+    transform->trans = 0;
+
+    if (id)
+        icu_utf16_from_utf8_cstr(id16, id, status);
+    if (rules)
+        icu_utf16_from_utf8_cstr(rules16, rules, status);
+
+    switch (transform->action)
+    {
+    case 'f':
+    case 'F':
+        transform->trans
+            = utrans_openU(id16->utf16, 
+                           id16->utf16_len,
+                           UTRANS_FORWARD,
+                           rules16->utf16, 
+                           rules16->utf16_len,
+                           &transform->parse_error, status);
+        break;
+    case 'r':
+    case 'R':
+        transform->trans
+            = utrans_openU(id16->utf16,
+                           id16->utf16_len,
+                           UTRANS_REVERSE ,
+                           rules16->utf16, 
+                           rules16->utf16_len,
+                           &transform->parse_error, status);
+        break;
+    default:
+        *status = U_UNSUPPORTED_ERROR;
+        break;
+    }
+    icu_buf_utf16_destroy(rules16);
+    icu_buf_utf16_destroy(id16);
+    
+    if (U_SUCCESS(*status))
+        return transform;
+
+    /* freeing if failed */
+    icu_transform_destroy(transform);
+    return 0;
+}
+
+void icu_transform_destroy(struct icu_transform * transform)
+{
+    if (transform)
+    {
+        if (transform->trans)
+            utrans_close(transform->trans);
+        xfree(transform);
+    }
+}
+
+int icu_transform_trans(struct icu_transform * transform,
+                        struct icu_buf_utf16 * dest16,
+                        struct icu_buf_utf16 * src16,
+                        UErrorCode *status)
+{
+    if (!transform || !transform->trans 
+        || !src16  || !dest16)
+        return 0;
+
+    if (!src16->utf16_len)
+    {           /* guarding for empty source string */
+        icu_buf_utf16_clear(dest16);
+        return 0;
+    }
+
+    if (!icu_buf_utf16_copy(dest16, src16))
+        return 0;
+
+    utrans_transUChars (transform->trans, 
+                        dest16->utf16, &(dest16->utf16_len),
+                        dest16->utf16_cap,
+                        0, &(src16->utf16_len), status);
+
+    if (U_FAILURE(*status))
+        icu_buf_utf16_clear(dest16);
+    
+    return dest16->utf16_len;
+}
+
+
+#endif /* YAZ_HAVE_ICU */
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * c-file-style: "Stroustrup"
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */
+