chore: re-organise source files for color LCD UI (#5358)

radio/src/lib_file.cpp

@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) EdgeTX
+ *
+ * Based on code named
+ *   libopenui - https://github.com/opentx/libopenui
+ *
+ * License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ */
+
+#include "lib_file.h"
+
+#include <inttypes.h>
+#include <cinttypes>
+
+const char * getFileExtension(const char * filename, uint8_t size, uint8_t extMaxLen, uint8_t * fnlen, uint8_t * extlen)
+{
+  int len = size;
+  if (!size) {
+    len = strlen(filename);
+  }
+  if (!extMaxLen) {
+    extMaxLen = LEN_FILE_EXTENSION_MAX;
+  }
+  if (fnlen != nullptr) {
+    *fnlen = (uint8_t)len;
+  }
+  for (int i=len-1; i >= 0 && len-i <= extMaxLen; --i) {
+    if (filename[i] == '.') {
+      if (extlen) {
+        *extlen = len-i;
+      }
+      return &filename[i];
+    }
+  }
+  if (extlen != nullptr) {
+    *extlen = 0;
+  }
+  return nullptr;
+}
+
+/**
+  Check if given extension exists in a list of extensions.
+  @param extension The extension to search for, including leading period.
+  @param pattern One or more file extensions concatenated together, including the periods.
+    The list is searched backwards and the first match, if any, is returned.
+    eg: ".gif.jpg.jpeg.png"
+  @param match Optional container to hold the matched file extension (wide enough to hold LEN_FILE_EXTENSION_MAX + 1).
+  @retval true if a extension was found in the lost, false otherwise.
+*/
+bool isExtensionMatching(const char * extension, const char * pattern, char * match)
+{
+  const char *ext;
+  uint8_t extlen, fnlen;
+  int plen;
+
+  ext = getFileExtension(pattern, 0, 0, &fnlen, &extlen);
+  plen = (int)fnlen;
+  while (plen > 0 && ext) {
+    if (!strncasecmp(extension, ext, extlen)) {
+      if (match != nullptr) strncat(&(match[0]='\0'), ext, extlen);
+      return true;
+    }
+    plen -= extlen;
+    if (plen > 0) {
+      ext = getFileExtension(pattern, plen, 0, nullptr, &extlen);
+    }
+  }
+  return false;
+}
+
+// returns true if current working dir is at the root level
+bool isCwdAtRoot()
+{
+  char path[10];
+  if (f_getcwd(path, sizeof(path)-1) == FR_OK) {
+    return (strcasecmp("/", path) == 0);
+  }
+  return false;
+}
+
+/*
+  Wrapper around the f_readdir() function which
+  also returns ".." entry for sub-dirs. (FatFS 0.12 does
+  not return ".", ".." dirs anymore)
+*/
+FRESULT sdReadDir(DIR * dir, FILINFO * fno, bool & firstTime)
+{
+  FRESULT res;
+  if (firstTime && !isCwdAtRoot()) {
+    // fake parent directory entry
+    strcpy(fno->fname, "..");
+    fno->fattrib = AM_DIR;
+    res = FR_OK;
+  }
+  else {
+    res = f_readdir(dir, fno);                   /* Read a directory item */
+  }
+  firstTime = false;
+  return res;
+}