AP_ROMFS: library for embedding files

this will be used for bootloaders and IO firmware

libraries/AP_ROMFS/AP_ROMFS.cpp

@@ -0,0 +1,39 @@
+/*
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*
+  implement a file store for embedded firmware images
+ */
+
+#include "AP_ROMFS.h"
+
+#ifdef HAL_HAVE_AP_ROMFS_EMBEDDED_H
+#include <ap_romfs_embedded.h>
+#else
+const AP_ROMFS::embedded_file AP_ROMFS::files[] = {};
+#endif
+
+/*
+  find an embedded file
+*/
+const uint8_t *AP_ROMFS::find_file(const char *name, uint32_t &size)
+{
+    for (uint16_t i=0; i<ARRAY_SIZE_SIMPLE(files); i++) {
+        if (strcmp(name, files[i].filename) == 0) {
+            size = files[i].size;
+            return files[i].contents;
+        }
+    }
+    return nullptr;
+}

libraries/AP_ROMFS/AP_ROMFS.h

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+/*
+  implement a file store for embedded firmware images
+ */
+
+#include <AP_HAL/AP_HAL.h>
+
+class AP_ROMFS {
+public:
+    // find an embedded file
+    static const uint8_t *find_file(const char *name, uint32_t &size);
+
+private:
+    struct embedded_file {
+        const char *filename;
+        uint32_t size;
+        const uint8_t *contents;
+    };
+    static const struct embedded_file files[];
+};