1 files changed, 186 insertions, 0 deletions
diff --git a/Userland/Libraries/LibIPC/Decoder.cpp b/Userland/Libraries/LibIPC/Decoder.cpp
new file mode 100644
index 0000000000..ff980bdaa5
--- /dev/null
+++ b/Userland/Libraries/LibIPC/Decoder.cpp
@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/MemoryStream.h>
+#include <AK/URL.h>
+#include <LibIPC/Decoder.h>
+#include <LibIPC/Dictionary.h>
+#include <LibIPC/File.h>
+#include <string.h>
+#include <sys/socket.h>
+
+namespace IPC {
+
+bool Decoder::decode(bool& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(u8& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(u16& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(u32& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(u64& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(i8& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(i16& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(i32& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(i64& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(float& value)
+{
+    m_stream >> value;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(String& value)
+{
+    i32 length = 0;
+    m_stream >> length;
+    if (m_stream.handle_any_error())
+        return false;
+    if (length < 0) {
+        value = {};
+        return true;
+    }
+    if (length == 0) {
+        value = String::empty();
+        return true;
+    }
+    char* text_buffer = nullptr;
+    auto text_impl = StringImpl::create_uninitialized(static_cast<size_t>(length), text_buffer);
+    m_stream >> Bytes { text_buffer, static_cast<size_t>(length) };
+    value = *text_impl;
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(ByteBuffer& value)
+{
+    i32 length = 0;
+    m_stream >> length;
+    if (m_stream.handle_any_error())
+        return false;
+    if (length < 0) {
+        value = {};
+        return true;
+    }
+    if (length == 0) {
+        value = ByteBuffer::create_uninitialized(0);
+        return true;
+    }
+    value = ByteBuffer::create_uninitialized(length);
+    m_stream >> value.bytes();
+    return !m_stream.handle_any_error();
+}
+
+bool Decoder::decode(URL& value)
+{
+    String string;
+    if (!decode(string))
+        return false;
+    value = URL(string);
+    return true;
+}
+
+bool Decoder::decode(Dictionary& dictionary)
+{
+    u64 size = 0;
+    m_stream >> size;
+    if (m_stream.handle_any_error())
+        return false;
+    if (size >= (size_t)NumericLimits<i32>::max()) {
+        ASSERT_NOT_REACHED();
+    }
+
+    for (size_t i = 0; i < size; ++i) {
+        String key;
+        if (!decode(key))
+            return false;
+        String value;
+        if (!decode(value))
+            return false;
+        dictionary.add(move(key), move(value));
+    }
+
+    return true;
+}
+
+bool Decoder::decode([[maybe_unused]] File& file)
+{
+#ifdef __serenity__
+    int fd = recvfd(m_sockfd);
+    if (fd < 0) {
+        dbgln("recvfd: {}", strerror(errno));
+        return false;
+    }
+    file = File(fd);
+    return true;
+#else
+    [[maybe_unused]] auto fd = m_sockfd;
+    warnln("fd passing is not supported on this platform, sorry :(");
+    return false;
+#endif
+}
+
+}