#include <glib.h>
using namespace std;
+#include "international.hh"
+#include "warn.hh"
#include "lily-guile.hh"
LY_DEFINE (ly_encode_string_for_pdf, "ly:encode-string-for-pdf",
1, 0, 0, (SCM str),
- "Check whether the string needs to be encoded for PDF output (Latin1,"
- " PDFDocEncoding or in the most general case UTF-16BE).")
+ "Encode the given string to either Latin1 (which is a subset of"
+ " the PDFDocEncoding) or if that's not possible to full UTF-16BE"
+ " with Byte-Order-Mark (BOM).")
{
LY_ASSERT_TYPE (scm_is_string, str, 1);
char *p = ly_scm2str0 (str);
char *g = NULL;
- const char *charset;
+ char const *charset="ISO-8859-1"; // Input is ALWAYS UTF-8!
gsize bytes_written = 0;
- g_get_charset (&charset); /* The current locale */
- /* First, try to convert to ISO-8859-1 (no encodings required) */
+ /* First, try to convert to ISO-8859-1 (no encodings required). This will
+ * fail, if the string contains accented characters, so we do not check
+ * for errors. */
g = g_convert (p, -1, "ISO-8859-1", charset, 0, &bytes_written, 0);
/* If that fails, we have to resolve to full UTF-16BE */
- if (!g) {
- char *g_without_BOM = g_convert (p, -1, "UTF-16BE", charset, 0, &bytes_written, 0);
- /* prepend the BOM manually, g_convert doesn't do it! */
- g = new char[bytes_written+3];
- g[0] = (char)254;
- g[1] = (char)255;
- memcpy (&g[2], g_without_BOM, bytes_written+1); // Copy string + \0
- free (g_without_BOM);
- bytes_written += 2;
- }
+ if (!g)
+ {
+ GError *e = NULL;
+ char *g_without_BOM = g_convert (p, -1, "UTF-16BE", charset, 0, &bytes_written, &e);
+ if (e != NULL)
+ {
+ warning (_f("Conversion of string `%s' to UTF-16be failed: %s", p, e->message));
+ g_error_free (e);
+ }
+ /* UTF-16BE allows/recommends a byte-order-mark (BOM) of two bytes
+ * \xFE\xFF at the begin of the string. The pdfmark specification
+ * requires it and depends on it to distinguish PdfDocEncoding from
+ * UTF-16BE. As g_convert does not automatically prepend this BOM
+ * for UTF-16BE (only for UTF-16, which uses lower endian by default,
+ * though), we have to prepend it manually. */
+ if (g_without_BOM) // conversion to UTF-16be might have failed (shouldn't!)
+ {
+ g = new char[bytes_written+3];
+ char const *BOM = "\xFE\xFF";
+ strcpy (g, BOM);
+ memcpy (&g[2], g_without_BOM, bytes_written+1); // Copy string + \0
+ free (g_without_BOM);
+ bytes_written += 2;
+ }
+ }
free (p);
/* Convert back to SCM object and return it */
- if (g) {
- return scm_from_locale_stringn (g, bytes_written);
- } else {
+ /* FIXME guile-2.0: With guile 2.0 the internal representation of a string
+ * has changed (char vector rather than binary bytes in
+ * UTF-8). However, with guile 2.0, ly:encode-string-for-pdf
+ * is no longer needed and can be replaced by the new
+ * (string->utf16 str 'big)
+ */
+ if (g)
+ return scm_take_str (g, bytes_written); // scm_take_str eventually frees g!
+ else
return str;
- }
-
}