Start assets component image signature tests

tools/pano_cli/main.cpp

@@ -1,9 +1,14 @@
+#include "assets/image_format.h"
 #include "foundation/parse.h"
 #include "foundation/result.h"
 
 #include <cstdint>
+#include <fstream>
 #include <iostream>
+#include <iterator>
+#include <string>
 #include <string_view>
+#include <vector>
 
 namespace {
 
@@ -13,6 +18,10 @@ struct DocumentArgs {
     std::uint32_t layers = 1;
 };
 
+struct InspectImageArgs {
+    std::string path;
+};
+
 void print_error(std::string_view command, std::string_view message)
 {
     std::cout << "{\"ok\":false,\"command\":\"" << command
@@ -24,6 +33,7 @@ void print_help()
     std::cout
         << "pano_cli commands:\n"
         << "  create-document --width N --height N [--layers N]\n"
+        << "  inspect-image --path FILE\n"
         << "  --help\n";
 }
 
@@ -81,6 +91,60 @@ int create_document(int argc, char** argv)
     return 0;
 }
 
+pp::foundation::Status parse_inspect_image_args(int argc, char** argv, InspectImageArgs& args)
+{
+    for (int i = 2; i < argc; ++i) {
+        const std::string_view key(argv[i]);
+        if (key == "--path") {
+            if (i + 1 >= argc) {
+                return pp::foundation::Status::invalid_argument("missing value for option");
+            }
+
+            args.path = argv[++i];
+        } else {
+            return pp::foundation::Status::invalid_argument("unknown option");
+        }
+    }
+
+    if (args.path.empty()) {
+        return pp::foundation::Status::invalid_argument("path must not be empty");
+    }
+
+    return pp::foundation::Status::success();
+}
+
+int inspect_image(int argc, char** argv)
+{
+    InspectImageArgs args;
+    const auto status = parse_inspect_image_args(argc, argv, args);
+    if (!status.ok()) {
+        print_error("inspect-image", status.message);
+        return 2;
+    }
+
+    std::ifstream stream(args.path, std::ios::binary);
+    if (!stream) {
+        print_error("inspect-image", "image file could not be opened");
+        return 2;
+    }
+
+    const std::vector<char> chars {
+        std::istreambuf_iterator<char>(stream),
+        std::istreambuf_iterator<char>()
+    };
+    const auto* data = reinterpret_cast<const std::byte*>(chars.data());
+    const auto format = pp::assets::detect_image_format(std::span<const std::byte>(data, chars.size()));
+    if (!format) {
+        print_error("inspect-image", format.status().message);
+        return 2;
+    }
+
+    std::cout << "{\"ok\":true,\"command\":\"inspect-image\",\"format\":\""
+              << pp::assets::image_format_name(format.value())
+              << "\",\"bytes\":" << chars.size() << "}\n";
+    return 0;
+}
+
 }
 
 int main(int argc, char** argv)
@@ -100,6 +164,10 @@ int main(int argc, char** argv)
         return create_document(argc, argv);
     }
 
+    if (command == "inspect-image") {
+        return inspect_image(argc, argv);
+    }
+
     print_error(command, "unknown command");
     return 2;
 }