Function _File_Open

src/file.c:252–322

* Internal function to truly open a file. * * @param filename The name of the file to open. * @param mode The mode to open the file in. Bit 1 means reading, bit 2 means writing. * @return An index value refering to the opened file, or FILE_INVALID. */

 * @return An index value refering to the opened file, or FILE_INVALID.
 */
static uint8 _File_Open(enum SearchDirectory dir, const char *filename, uint8 mode)
{
	uint8 fileIndex;
	FileInfo *fileInfo;
	FileInfo *pakInfo = NULL;

	if ((mode & FILE_MODE_READ_WRITE) == 0) return FILE_INVALID;

	/* Find a free spot in our limited array */
	for (fileIndex = 0; fileIndex < FILE_MAX; fileIndex++) {
		if (s_file[fileIndex].fp == NULL) break;
	}
	if (fileIndex >= FILE_MAX) {
		Warning("Limit of %d open files reached.\n", FILE_MAX);
		return FILE_INVALID;
	}

	if(mode == FILE_MODE_READ && dir != SEARCHDIR_PERSONAL_DATA_DIR) {
		/* Look in PAK only for READ only files, and not Personnal files */
		fileInfo = FileInfo_Find_ByName(filename, &pakInfo);
		if (fileInfo == NULL) return FILE_INVALID;
		if (pakInfo == NULL) {
			/* Check if we can find the file outside any PAK file */
			s_file[fileIndex].fp = fopendatadir(dir, filename, "rb");
			if (s_file[fileIndex].fp == NULL) return FILE_INVALID;

			s_file[fileIndex].start    = 0;
			s_file[fileIndex].position = 0;
			fseek(s_file[fileIndex].fp, 0, SEEK_END);
			s_file[fileIndex].size = ftell(s_file[fileIndex].fp);
			fseek(s_file[fileIndex].fp, 0, SEEK_SET);
		} else {
			/* file is found in PAK */
			if (pakInfo != s_currentPakInfo) {
				if (s_currentPakFp != NULL) fclose(s_currentPakFp);
				s_currentPakFp = fopendatadir(dir, pakInfo->filename, "rb");
				s_currentPakInfo = pakInfo;
			}
			s_file[fileIndex].fp = s_currentPakFp;
			if (s_file[fileIndex].fp == NULL) return FILE_INVALID;

			s_file[fileIndex].start    = fileInfo->filePosition;
			s_file[fileIndex].position = 0;
			s_file[fileIndex].size     = fileInfo->fileSize;

			/* Go to the start of the file now */
			fseek(s_file[fileIndex].fp, s_file[fileIndex].start, SEEK_SET);
		}
		s_file[fileIndex].pakInfo = pakInfo;
		return fileIndex;
	}

	/* Check if we can find the file outside any PAK file */
	s_file[fileIndex].fp = fopendatadir(dir, filename, (mode == FILE_MODE_WRITE) ? "wb" : ((mode == FILE_MODE_READ_WRITE) ? "wb+" : "rb"));
	if (s_file[fileIndex].fp != NULL) {
		s_file[fileIndex].start    = 0;
		s_file[fileIndex].position = 0;
		s_file[fileIndex].size     = 0;