LibCore+LibIPC: Add Core::AnonymousBuffer, an IPC-friendly buffer class

This will be used to migrate remaining clients off of shbufs.

2 files changed, 31 insertions, 0 deletions

diff --git a/Userland/Libraries/LibIPC/Decoder.cpp b/Userland/Libraries/LibIPC/Decoder.cpp
index 96871f0b5b..5176d6ab12 100644
--- a/Userland/Libraries/LibIPC/Decoder.cpp
+++ b/Userland/Libraries/LibIPC/Decoder.cpp
@@ -26,6 +26,7 @@
 
 #include <AK/MemoryStream.h>
 #include <AK/URL.h>
+#include <LibCore/AnonymousBuffer.h>
 #include <LibIPC/Decoder.h>
 #include <LibIPC/Dictionary.h>
 #include <LibIPC/File.h>
@@ -183,4 +184,24 @@ bool Decoder::decode([[maybe_unused]] File& file)
 #endif
 }
 
+bool decode(Decoder& decoder, Core::AnonymousBuffer& buffer)
+{
+    bool valid = false;
+    if (!decoder.decode(valid))
+        return false;
+    if (!valid) {
+        buffer = {};
+        return true;
+    }
+    u32 size;
+    if (!decoder.decode(size))
+        return false;
+    IPC::File anon_file;
+    if (!decoder.decode(anon_file))
+        return false;
+
+    buffer = Core::AnonymousBuffer::create_from_anon_fd(anon_file.take_fd(), size);
+    return buffer.is_valid();
+}
+
 }
diff --git a/Userland/Libraries/LibIPC/Encoder.cpp b/Userland/Libraries/LibIPC/Encoder.cpp
index 240c3d927f..42aa60a675 100644
--- a/Userland/Libraries/LibIPC/Encoder.cpp
+++ b/Userland/Libraries/LibIPC/Encoder.cpp
@@ -27,6 +27,7 @@
 #include <AK/ByteBuffer.h>
 #include <AK/String.h>
 #include <AK/URL.h>
+#include <LibCore/AnonymousBuffer.h>
 #include <LibIPC/Dictionary.h>
 #include <LibIPC/Encoder.h>
 #include <LibIPC/File.h>
@@ -170,4 +171,13 @@ Encoder& Encoder::operator<<(const File& file)
     return *this;
 }
 
+bool encode(Encoder& encoder, const Core::AnonymousBuffer& buffer)
+{
+    encoder << buffer.is_valid();
+    if (buffer.is_valid()) {
+        encoder << (u32)buffer.size();
+        encoder << IPC::File(buffer.fd());
+    }
+    return true;
+}
 }