refactor: MCP層をmcpc APIベースに刷新

- 独自JSON-RPC処理をmcpcへ置き換え
- 各MCPツールを個別ソースへ分離
- 共通コンテキストと登録処理を整理
- mcpc互換修正と統合テストを更新

1 files changed, 76 insertions, 0 deletions

diff --git a/src/storage/codec.c b/src/storage/codec.c
new file mode 100644
index 0000000..af061ce
--- /dev/null
+++ b/src/storage/codec.c
@@ -0,0 +1,76 @@
+#include "storage/codec.h"
+
+void
+tiny_codec_put_u32(unsigned char *output, uint32_t value)
+{
+  if (output == NULL)
+    {
+      return;
+    }
+  output[0] = (unsigned char)value;
+  output[1] = (unsigned char)(value >> 8);
+  output[2] = (unsigned char)(value >> 16);
+  output[3] = (unsigned char)(value >> 24);
+}
+
+void
+tiny_codec_put_u64(unsigned char *output, uint64_t value)
+{
+  unsigned index;
+  if (output == NULL)
+    {
+      return;
+    }
+  for (index = 0; index < 8; ++index)
+    {
+      output[index] = (unsigned char)(value >> (index * 8));
+    }
+}
+
+uint32_t
+tiny_codec_get_u32(const unsigned char *input)
+{
+  if (input == NULL)
+    {
+      return 0;
+    }
+  return (uint32_t)input[0] | ((uint32_t)input[1] << 8) | ((uint32_t)input[2] << 16)
+         | ((uint32_t)input[3] << 24);
+}
+
+uint64_t
+tiny_codec_get_u64(const unsigned char *input)
+{
+  uint64_t value = 0;
+  int index;
+  if (input == NULL)
+    {
+      return 0;
+    }
+  for (index = 7; index >= 0; --index)
+    {
+      value = (value << 8) | input[index];
+    }
+  return value;
+}
+
+uint32_t
+tiny_codec_crc32(const unsigned char *data, size_t length)
+{
+  uint32_t crc = 0xffffffffU;
+  size_t index;
+  if (data == NULL && length != 0)
+    {
+      return 0;
+    }
+  for (index = 0; index < length; ++index)
+    {
+      unsigned bit;
+      crc ^= data[index];
+      for (bit = 0; bit < 8; ++bit)
+        {
+          crc = (crc >> 1) ^ (0xedb88320U & (uint32_t)-(int32_t)(crc & 1));
+        }
+    }
+  return ~crc;
+}