Added Danmarc character set decoder (bug #2345).

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

diff --git a/src/iconv_decode_danmarc.c b/src/iconv_decode_danmarc.c
new file mode 100644 (file)
index 0000000..3dc0f6e
--- /dev/null
+++ b/src/iconv_decode_danmarc.c
@@ -0,0 +1,132 @@
+/* This file is part of the YAZ toolkit.
+ * Copyright (C) 1995-2008 Index Data
+ * See the file LICENSE for details.
+ */
+/**
+ * \file
+ * \brief Danmarc2 character set decoding
+ *
+ */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <yaz/log.h>
+#include <yaz/xmalloc.h>
+#include "iconv-p.h"
+
+struct decoder_data {
+    unsigned long x_back;
+};
+
+static unsigned long read_danmarc(yaz_iconv_t cd, 
+                                  yaz_iconv_decoder_t d,
+                                  unsigned char *inp,
+                                  size_t inbytesleft, size_t *no_read)
+{
+    struct decoder_data *data = (struct decoder_data *) d->data;
+    unsigned long x = inp[0];
+
+    if (data->x_back)
+    {
+        *no_read = 1;
+        x = data->x_back;
+        data->x_back = 0;
+        return x;
+    }
+
+    if (x == '@')
+    {
+        if (inbytesleft < 2)
+        {
+            yaz_iconv_set_errno(cd, YAZ_ICONV_EINVAL);
+            *no_read = 0;
+            return 0;
+        }
+        switch(inp[1])
+        {
+        case '@':
+        case '*':
+        case 0xa4: /* CURRENCY SIGN */
+            x = inp[1];
+            *no_read = 2;
+            break;
+        case 0xe5: /* LATIN SMALL LETTER A WITH RING ABOVE */
+            x = 'a';
+            data->x_back = 'a';
+            *no_read = 1;
+            break;
+        case 0xc5: /* LATIN CAPITAL LETTER A WITH RING ABOVE */
+            x = 'A';
+            data->x_back = 'a';
+            *no_read = 1;
+            break;
+        default:
+            if (inbytesleft < 5)
+            {
+                yaz_iconv_set_errno(cd, YAZ_ICONV_EINVAL);
+                *no_read = 0;
+                return 0;
+            }
+            else
+            {
+                unsigned long v;
+                sscanf(inp+1, "%4lx", &v);
+                *no_read = 5;
+                x = v;
+            }
+        }
+    }
+    else
+        *no_read = 1;
+    return x;
+}
+
+
+static size_t init_danmarc(yaz_iconv_t cd, yaz_iconv_decoder_t d,
+                           unsigned char *inp,
+                           size_t inbytesleft, size_t *no_read)
+{
+    struct decoder_data *data = (struct decoder_data *) d->data;
+    data->x_back = 0;
+    return 0;
+}
+
+void destroy_danmarc(yaz_iconv_decoder_t d)
+{
+    struct decoder_data *data = (struct decoder_data *) d->data;
+    xfree(data);
+}
+
+yaz_iconv_decoder_t yaz_danmarc_decoder(const char *fromcode,
+                                        yaz_iconv_decoder_t d)
+    
+{
+    if (!yaz_matchstr(fromcode, "danmarc"))
+    {
+        struct decoder_data *data = (struct decoder_data *)
+            xmalloc(sizeof(*data));
+        d->data = data;
+        data->x_back = 0;
+        d->read_handle = read_danmarc;
+        d->init_handle = init_danmarc;
+        d->destroy_handle = destroy_danmarc;
+        return d;
+    }
+    return 0;
+}
+
+
+/*
+ * Local variables:
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ * vim: shiftwidth=4 tabstop=8 expandtab
+ */