integrate zstd

CMakeLists.txt

@@ -73,6 +73,14 @@ FetchContent_Declare(
 )
 FetchContent_MakeAvailable(sockpp)
 
+FetchContent_Declare(
+  zstd
+  URL_HASH SHA256=3b1c3b46e416d36931efd34663122d7f51b550c87f74de2d38249516fe7d8be5
+  URL ${CMAKE_SOURCE_DIR}/deps/zstd-v1.5.6-mirror.zip
+  SOURCE_SUBDIR build/cmake
+)
+FetchContent_MakeAvailable(zstd)
+
 include_directories(${CMAKE_SOURCE_DIR}/bpt/include)
 include_directories(${CMAKE_SOURCE_DIR}/stlite)
 

design.md

@@ -29,3 +29,4 @@ ___
 - googletest：调试用
 - spdlog：运行日志，调试用（不是数据库系统日志）
 - sockpp：服务器模式下与Python交互用
+- zstd：为快照系统提供数据压缩（只使用最基本的压缩功能，不借用其patch功能）

src/CMakeLists.txt

@@ -7,4 +7,5 @@ add_executable(${BACKEND_EXETUABLE_NAME} main.cpp)
 target_link_libraries(${BACKEND_EXETUABLE_NAME} argparse)
 target_link_libraries(${BACKEND_EXETUABLE_NAME} spdlog::spdlog)
 target_link_libraries(${BACKEND_EXETUABLE_NAME} sockpp)
+target_link_libraries(${BACKEND_EXETUABLE_NAME} libzstd_static)
 set_target_properties(${BACKEND_EXETUABLE_NAME} PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})

src/main.cpp

@@ -1,4 +1,5 @@
 #include <sockpp/tcp_acceptor.h>
+#include <zstd.h>
 #include "basic_defs.h"
 const std::string main_version = "0.0.1";
 const std::string build_version = GIT_COMMIT_HASH;