Add a C wrapper for decompression

CMakeLists.txt

@@ -52,3 +52,5 @@ install(
     FILES "${config_file}" "${version_config_file}"
     DESTINATION ${config_install_dir}
 )
+
+add_subdirectory("lzokay-c")

lzokay-c/CMakeLists.txt

@@ -0,0 +1,5 @@
+project(lzokay-c VERSION 0.1 LANGUAGES C CXX)
+
+add_library(lzokay-c lzokay-c.cpp lzokay-c.h)
+target_link_libraries(lzokay-c PRIVATE lzokay)
+set_target_properties(lzokay-c PROPERTIES CXX_STANDARD 14)

lzokay-c/lzokay-c.cpp

@@ -0,0 +1,20 @@
+#include "lzokay-c.h"
+#include "../lzokay.hpp"
+
+static_assert(EResult_LookbehindOverrun == lzokay_EResult(lzokay::EResult::LookbehindOverrun), "LookbehindOverrun mismatch");
+static_assert(EResult_OutputOverrun == lzokay_EResult(lzokay::EResult::OutputOverrun), "OutputOverrun mismatch");
+static_assert(EResult_InputOverrun == lzokay_EResult(lzokay::EResult::InputOverrun), "InputOverrun mismatch");
+static_assert(EResult_Error == lzokay_EResult(lzokay::EResult::Error), "Error mismatch");
+static_assert(EResult_Success == lzokay_EResult(lzokay::EResult::Success), "Success mismatch");
+static_assert(EResult_InputNotConsumed == lzokay_EResult(lzokay::EResult::InputNotConsumed), "InputNotConsumed mismatch");
+
+extern "C"
+lzokay_EResult lzokay_decompress(const uint8_t * src, size_t src_size, 
+                                 uint8_t *output, size_t *output_len)
+{
+    size_t needed_size = 0;
+    lzokay::EResult error =
+        lzokay::decompress(src, src_size, output, *output_len, needed_size);
+    *output_len = needed_size;
+    return lzokay_EResult(error);
+}

lzokay-c/lzokay-c.h

@@ -0,0 +1,27 @@
+#ifndef LZOKAY_C_INCLUDED
+#define LZOKAY_C_INCLUDED
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stddef.h>
+
+typedef enum {
+  EResult_LookbehindOverrun = -4,
+  EResult_OutputOverrun = -3,
+  EResult_InputOverrun = -2,
+  EResult_Error = -1,
+  EResult_Success = 0,
+  EResult_InputNotConsumed = 1,
+} lzokay_EResult;
+
+lzokay_EResult lzokay_decompress(const uint8_t * src, size_t src_size, 
+                                 uint8_t *output, size_t *output_len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // LZOKAY_C_INCLUDED