1 files changed, 169 insertions, 0 deletions
diff --git a/src/lib/icu/Converter.cxx b/src/lib/icu/Converter.cxx
new file mode 100644
index 000000000..ea10a9a03
--- /dev/null
+++ b/src/lib/icu/Converter.cxx
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2003-2015 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "Converter.hxx"
+#include "Error.hxx"
+#include "util/Error.hxx"
+#include "util/Macros.hxx"
+#include "util/WritableBuffer.hxx"
+#include "util/ConstBuffer.hxx"
+
+#include <string.h>
+
+#ifdef HAVE_ICU
+#include "Util.hxx"
+#include <unicode/ucnv.h>
+#elif defined(HAVE_GLIB)
+#include "util/Domain.hxx"
+static constexpr Domain g_iconv_domain("g_iconv");
+#endif
+
+#ifdef HAVE_ICU
+
+IcuConverter::~IcuConverter()
+{
+	ucnv_close(converter);
+}
+
+#endif
+
+#ifdef HAVE_ICU_CONVERTER
+
+IcuConverter *
+IcuConverter::Create(const char *charset, Error &error)
+{
+#ifdef HAVE_ICU
+	UErrorCode code = U_ZERO_ERROR;
+	UConverter *converter = ucnv_open(charset, &code);
+	if (converter == nullptr) {
+		error.Format(icu_domain, int(code),
+			     "Failed to initialize charset '%s': %s",
+			     charset, u_errorName(code));
+		return nullptr;
+	}
+
+	return new IcuConverter(converter);
+#elif defined(HAVE_GLIB)
+	GIConv to = g_iconv_open("utf-8", charset);
+	GIConv from = g_iconv_open(charset, "utf-8");
+	if (to == (GIConv)-1 || from == (GIConv)-1) {
+		if (to != (GIConv)-1)
+			g_iconv_close(to);
+		if (from != (GIConv)-1)
+			g_iconv_close(from);
+		error.Format(g_iconv_domain,
+			     "Failed to initialize charset '%s'", charset);
+		return nullptr;
+	}
+
+	return new IcuConverter(to, from);
+#endif
+}
+
+#ifdef HAVE_ICU
+#elif defined(HAVE_GLIB)
+
+static std::string
+DoConvert(GIConv conv, const char *src)
+{
+	// TODO: dynamic buffer?
+	char buffer[4096];
+	char *in = const_cast<char *>(src);
+	char *out = buffer;
+	size_t in_left = strlen(src);
+	size_t out_left = sizeof(buffer);
+
+	size_t n = g_iconv(conv, &in, &in_left, &out, &out_left);
+
+	if (n == static_cast<size_t>(-1) || in_left > 0)
+		return std::string();
+
+	return std::string(buffer, sizeof(buffer) - out_left);
+}
+
+#endif
+
+std::string
+IcuConverter::ToUTF8(const char *s) const
+{
+#ifdef HAVE_ICU
+	const ScopeLock protect(mutex);
+
+	ucnv_resetToUnicode(converter);
+
+	// TODO: dynamic buffer?
+	UChar buffer[4096], *target = buffer;
+	const char *source = s;
+
+	UErrorCode code = U_ZERO_ERROR;
+
+	ucnv_toUnicode(converter, &target, buffer + ARRAY_SIZE(buffer),
+		       &source, source + strlen(source),
+		       nullptr, true, &code);
+	if (code != U_ZERO_ERROR)
+		return std::string();
+
+	const size_t target_length = target - buffer;
+	const auto u = UCharToUTF8({buffer, target_length});
+	if (u.IsNull())
+		return std::string();
+
+	std::string result(u.data, u.size);
+	delete[] u.data;
+	return result;
+
+#elif defined(HAVE_GLIB)
+	return DoConvert(to_utf8, s);
+#endif
+}
+
+std::string
+IcuConverter::FromUTF8(const char *s) const
+{
+#ifdef HAVE_ICU
+	const ScopeLock protect(mutex);
+
+	const auto u = UCharFromUTF8(s);
+	if (u.IsNull())
+		return std::string();
+
+	ucnv_resetFromUnicode(converter);
+
+	// TODO: dynamic buffer?
+	char buffer[4096], *target = buffer;
+	const UChar *source = u.data;
+	UErrorCode code = U_ZERO_ERROR;
+
+	ucnv_fromUnicode(converter, &target, buffer + ARRAY_SIZE(buffer),
+			 &source, u.end(),
+			 nullptr, true, &code);
+	delete[] u.data;
+
+	if (code != U_ZERO_ERROR)
+		return std::string();
+
+	return std::string(buffer, target);
+
+#elif defined(HAVE_GLIB)
+	return DoConvert(from_utf8, s);
+#endif
+}
+
+#endif