Integrate CircularBuffer as essential part of loading files from CD and dedicate file processing to the FileProcessor

include/PSX/Auxiliary/lz4_decompressor.hpp

@@ -11,6 +11,10 @@ namespace JabyEngine {
             Progress progress;
             size_t   bytes_ready;
 
+            constexpr operator bool() const {
+                return this->progress != Progress::Error;
+            }
+
             static constexpr Result new_error() {
                 return {Progress::Error, 0};
             }
@@ -27,6 +31,7 @@ namespace JabyEngine {
     private:
         struct State {
             enum struct Step {
+                Disabled,
                 ReadToken,
                 ObtainLiteralLength,
                 CopyLiterals,
@@ -35,12 +40,23 @@ namespace JabyEngine {
                 CopyMatch,
             };
 
-            Step     step           = Step::ReadToken;
+            Step     step           = Step::Disabled;
             size_t   literal_length = 0;
             size_t   match_length   = 0;
-            uint16_t match_offset   = 0xFFFF;
+            uint16_t match_offset   = 0;
 
             State() = default;
+
+            void enable() {
+                this->step           = Step::ReadToken;
+                this->literal_length = 0;
+                this->match_length   = 0;
+                this->match_offset   = 0xFFFF;
+            }
+
+            void disable() {
+                this->step = Step::Disabled;
+            }
         };
 
     private:
@@ -56,7 +72,7 @@ namespace JabyEngine {
         }
 
         void setup(uint8_t* dst_adr);
-        void reset();
+        void disable();
 
         Result process(ArrayRange<const uint8_t> data, bool is_last);
     };