◆ gpak_fopen()

GPAK_API gpak_file_t* gpak_fopen	(	gpak_t *	_pak,
		const char *	_path
	)

Brief Description:\n Opens a file in a G-PAK archive.

This function opens a file with the specified _path in the G-PAK archive.

Parameters

_pak	A pointer to the gpak_t.
_path	A string containing the path of the file to open.

Returns: A pointer to the opened gpak_file_t or NULL if an error occurred.

Definition at line 389 of file gpak.c.

 {
     filesystem_tree_file_t* _file_info = filesystem_tree_find_file(_pak->root_, _path);
     if (!_file_info)
     {
         _gpak_make_error(_pak, GPAK_ERROR_FILE_NOT_FOUND);
         return NULL;
     }
  
     _pak->current_file_ = filesystem_tree_file_path(_pak->root_, _file_info);
  
     uint32_t uncompressed_size = _file_info->entry_.uncompressed_size_;
     uint32_t compressed_size = _file_info->entry_.compressed_size_;
  
     gpak_file_t* mfile = (gpak_file_t*)malloc(sizeof(gpak_file_t));
     mfile->data_ = (char*)malloc(uncompressed_size + 1);
     mfile->data_[uncompressed_size] = '\0';
  
     mfile->stream_ = fmemopen(mfile->data_, uncompressed_size, "wb+");
  
     // Setting position to file start
     fseek(_pak->stream_, _file_info->entry_.offset_, SEEK_SET);
  
     if (_pak->header_.compression_ & GPAK_HEADER_COMPRESSION_DEFLATE)
         mfile->crc32_ = _gpak_decompressor_inflate(_pak, _pak->stream_, mfile->stream_, compressed_size);
     else if (_pak->header_.compression_ & GPAK_HEADER_COMPRESSION_ZST)
         mfile->crc32_ = _gpak_decompressor_zstd(_pak, _pak->stream_, mfile->stream_, compressed_size);
     else
         mfile->crc32_ = _gpak_decompressor_none(_pak, _pak->stream_, mfile->stream_, compressed_size);
  
     fseek(mfile->stream_, 0, SEEK_SET);
  
     // Check crc32
     if (mfile->crc32_ != _file_info->entry_.crc32_)
     {
         _gpak_make_error(_pak, GPAK_ERROR_FILE_CRC_NOT_MATCH);
         free(_pak->current_file_);
         gpak_fclose(mfile);
         return NULL;
     }
  
     free(_pak->current_file_);
  
     return mfile;
 }

References _gpak_decompressor_inflate(), _gpak_decompressor_none(), _gpak_decompressor_zstd(), gpak_entry_header::compressed_size_, gpak_header::compression_, gpak_entry_header::crc32_, gpak_file::crc32_, gpak::current_file_, gpak_file::data_, filesystem_tree_file::entry_, filesystem_tree_file_path(), filesystem_tree_find_file(), GPAK_ERROR_FILE_CRC_NOT_MATCH, GPAK_ERROR_FILE_NOT_FOUND, gpak_fclose(), GPAK_HEADER_COMPRESSION_DEFLATE, GPAK_HEADER_COMPRESSION_ZST, gpak::header_, gpak_entry_header::offset_, gpak::root_, gpak::stream_, gpak_file::stream_, and gpak_entry_header::uncompressed_size_.