Rename, move some json stuff to header

src/serialization.cpp

@@ -1,85 +1,7 @@
+#include "serialization.h"
 #include "connection.h"
 #include "discord-rpc.h"
 
-#include "rapidjson/writer.h"
-#include "rapidjson/stringbuffer.h"
-#include "rapidjson/internal/itoa.h"
-
-// I want to use as few allocations as I can get away with, and to do that with RapidJson, you need to supply some of
-// your own allocators for stuff rather than use the defaults
-
-class LinearAllocator {
-public:
-    char* buffer_;
-    char* end_;
-    LinearAllocator() {
-        assert(0); // needed for some default case in rapidjson, should not use
-    }
-    LinearAllocator(char* buffer, size_t size) : buffer_(buffer), end_(buffer + size) {}
-    static const bool kNeedFree = false;
-    void* Malloc(size_t size)
-    {
-        char* res = buffer_;
-        buffer_ += size;
-        if (buffer_ > end_) {
-            buffer_ = res;
-            return nullptr;
-        }
-        return res;
-    }
-    void* Realloc(void* originalPtr, size_t originalSize, size_t newSize)
-    {
-        if (newSize == 0) {
-            return nullptr;
-        }
-        // allocate how much you need in the first place
-        assert(!originalPtr && !originalSize);
-        return Malloc(newSize);
-    }
-    static void Free(void* ptr) { /* shrug */ }
-};
-
-template<int Size>
-class FixedLinearAllocator : public LinearAllocator {
-public:
-    char fixedBuffer_[Size];
-    FixedLinearAllocator() : LinearAllocator(fixedBuffer_, Size) {}
-    static const bool kNeedFree = false;
-};
-
-// wonder why this isn't a thing already, maybe I missed it
-class DirectStringBuffer {
-public:
-    typedef typename char Ch;
-    char* buffer_;
-    char* end_;
-    char* current_;
-
-    DirectStringBuffer(char* buffer, size_t maxLen)
-        : buffer_(buffer)
-        , end_(buffer + maxLen)
-        , current_(buffer)
-    {}
-
-    void Put(char c)
-    {
-        if (current_ < end_) {
-            *current_++ = c;
-        }
-    }
-    void Flush() {}
-    size_t GetSize() const
-    {
-        return current_ - buffer_;
-    }
-};
-
-using Encoding = rapidjson::UTF8<char>;
-// Writer appears to need about 16 bytes per nested object level (with 64bit size_t)
-using WriterAllocator = FixedLinearAllocator<2048>;
-constexpr size_t WriterNestingLevels = 2048 / 16;
-using JsonWriter = rapidjson::Writer<DirectStringBuffer, Encoding, Encoding, WriterAllocator, rapidjson::kWriteNoFlags>;
-
 // it's ever so slightly faster to not have to strlen the key
 template<typename T>
 void WriteKey(JsonWriter& w, T& k) {