slowly transitioning to a more efficient way of interacting with sealed packages

modules/build/include/archive_reader.hpp

@@ -0,0 +1,43 @@
+/**
+* @file archive_reader.hpp
+ * @brief Functions for in-memory archive reading and verification
+ */
+#pragma once
+
+#include <string>
+#include <vector>
+#include <map>
+#include <archive.h>
+#include <archive_entry.h>
+#include <unistd.h>
+#include <cstring>
+#include <cstdlib>
+#include <fcntl.h>
+#include "checksums.hpp"
+
+extern "C" {
+    /**
+     * Extracts a specific file from a package file (gzipped tarball)
+     *
+     * @param package_file_path Path to the package file (.dpm)
+     * @param file_path_in_archive Path of the file to extract within the archive
+     * @param data Pointer to buffer pointer - will be allocated by function
+     * @param data_size Pointer to size variable that will receive file size
+     * @return true on success, false on failure
+     */
+    bool get_file_from_package_file(const char* package_file_path, const char* file_path_in_archive, unsigned char** data, size_t* data_size);
+
+    /**
+     * Extracts a specific file from an in-memory archive (gzipped tarball)
+     *
+     * @param archive_data Pointer to the archive data in memory
+     * @param archive_data_size Size of the archive data in memory
+     * @param file_path_in_archive Path of the file to extract within the archive
+     * @param result_data Pointer to buffer pointer - will be allocated by function
+     * @param result_data_size Pointer to size variable that will receive file size
+     * @return true on success, false on failure
+     */
+    bool get_file_from_memory_loaded_archive(const unsigned char* archive_data, const size_t archive_data_size,
+                                            const char* file_path_in_archive,
+                                            unsigned char** result_data, size_t* result_data_size);
+}