commit dda01cbe040e648689f4ac3af9fc773628d7f70c
Author: hardliner66 <hardliner66@gmail.com>
Date:   Mon Oct 14 23:04:37 2024 +0200

    init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..aac40cb
Binary files /dev/null and b/.gitignore differ
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..070bdd4
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,107 @@
+cmake_minimum_required(VERSION 3.11)
+project(DownloadFile)
+
+cmake_policy(SET CMP0140 NEW)
+function(check_file_reachable url)
+    file(DOWNLOAD "${url}"
+        RANGE_END 10
+        TIMEOUT 2
+        INACTIVITY_TIMEOUT 1
+        STATUS download_status)
+
+    list(GET download_status 0 download_status_code)
+    if("${download_status_code}" STREQUAL "0")
+        set(file_reachable "1")
+    else()
+        set(file_reachable "0")
+    endif()
+    return(PROPAGATE file_reachable) # File is reachable
+endfunction()
+
+function(download_file_with_hash_check url dest)
+    set(options REQUIRED)
+    set(oneValueArgs URL DEST HASH_URL)
+    cmake_parse_arguments(PARSE_ARGV 0 ARG "${options}" "${oneValueArgs}" "")
+
+    if(ARG_URL)
+        set(url "${ARG_URL}")
+    endif()
+
+    if(ARG_DEST)
+        set(dest "${ARG_DEST}")
+    endif()
+
+    set(hash_url "${url}.hash")
+
+    if(ARG_HASH_URL)
+        set(hash_url "${ARG_HASH_URL}")
+    endif()
+    message(STATUS "${hash_url}")
+
+    check_file_reachable("${url}")
+
+    if("${file_reachable}" STREQUAL "0")
+        if(ARG_REQUIRED)
+            if(NOT EXISTS "${dest}")
+                message(FATAL_ERROR "File ${dest} could not be downloaded and is not present, even though it was marked as REQUIRED.")
+            endif()
+        endif()
+        return()
+    endif()
+
+    set(hash_file "${dest}.hash")
+    set(hash_file_temp "${hash_file}.temp")
+
+    # Download the hash file (if available)
+    file(DOWNLOAD "${hash_url}" "${hash_file_temp}"
+        STATUS download_status
+        TIMEOUT 60)
+
+    list(GET download_status 0 download_status_code)
+    if(NOT "${download_status_code}" STREQUAL "0")
+        file(REMOVE "${hash_file_temp}")
+        # Hash file is not available, just check if the file exists
+        if(EXISTS "${dest}")
+            message(STATUS "File ${dest} already exists, no hash file found. Skipping download.")
+            return()
+        else()
+            message(STATUS "File ${dest} not found, downloading without hash check.")
+            file(DOWNLOAD "${url}" "${dest}" SHOW_PROGRESS TIMEOUT 60)
+            return()
+        endif()
+    endif()
+
+    file(READ "${hash_file_temp}" expected_hash)
+    string(STRIP "${expected_hash}" expected_hash)
+    if(NOT "${expected_hash}" STREQUAL "")
+        file(RENAME "${hash_file_temp}" "${hash_file}")
+    endif()
+
+    # Hash file downloaded, now read the hash
+    file(READ "${hash_file}" expected_hash)
+    string(STRIP "${expected_hash}" expected_hash) # Remove whitespace around hash
+    if(EXISTS "${dest}")
+        file(SHA256 "${dest}" actual_hash)
+        if("${expected_hash}" STREQUAL "${actual_hash}")
+            message(STATUS "File ${dest} already matches the hash. Skipping download.")
+            return()
+        else()
+            message(WARNING "Hash mismatch for ${dest}. Downloading the file again.")
+        endif()
+    else()
+        message(STATUS "File ${dest} not found. Downloading.")
+    endif()
+
+    # Download the actual file
+    file(DOWNLOAD "${url}" "${dest}" SHOW_PROGRESS TIMEOUT 60)
+
+    # Recheck the hash after downloading
+    file(SHA256 "${dest}" actual_hash)
+    if(NOT "${expected_hash}" STREQUAL "${actual_hash}")
+        message(FATAL_ERROR "Downloaded file ${dest} hash mismatch. Expected: ${expected_hash}, got: ${actual_hash}")
+    else()
+        message(STATUS "File ${dest} downloaded and verified successfully.")
+    endif()
+endfunction()
+
+download_file_with_hash_check(URL "http://127.0.0.1:8080/random_file.bin" DEST "${CMAKE_BINARY_DIR}/random_file.bin" REQUIRED)