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1. 发明授权

US5548757A Method and apparatus for appending information to data files, ensuring proper end-of-file indication 失效
标题翻译：将信息附加到数据文件的方法和装置，确保正确的文件结束指示
公开(公告)号：US5548757A
公开(公告)日：1996-08-20
申请号：US448297
申请日：1995-05-23
申请人： Tsutoshi Matsuyama , Hideyuki Takahashi
发明人： Tsutoshi Matsuyama , Hideyuki Takahashi
IPC分类号： G06F12/00 , G06F11/00 , G06F11/34 , G06F17/30
CPC分类号： G06F11/004 , G06F11/0796 , G06F11/3476
摘要： New data is appended to a file having a first end-of-file information at the end thereof, and even in the case where a hazardous state such as a system failure or shortage of storage area unexpectedly occurs during data write operation, the data in the file which existed before the occurrence of the hazard can be read. First, new data having a second end-of-file information at the end thereof is written subsequently to the first end-of-file information of the file, and when the writing of the new data with the second end-of-file information is completed, the first end-of-file information of the file is altered to continuation information indicating continuity of the file. Accordingly, even if the write operation unexpectedly fails due to system failure or shortage of storage area, at least one end-of-file mark exists in the file, whereby the effective last update point can be specified by the second end-of-file information.
摘要翻译：新的数据附加在文件结尾的第一个文件结束信息的文件中，即使在数据写入操作期间意外地发生诸如系统故障或存储区域不足的危险状态的情况下，可以读取在危险发生之前存在的文件。首先，在文件的第一文件结束信息之后写入在其末尾具有第二结束文件信息的新数据，并且当用第二文件结束信息写入新数据时完成后，文件的第一个文件结束信息被更改为指示文件连续性的继续信息。因此，即使写入操作由于系统故障或存储区域的不足而意外地失败，文件中存在至少一个文件结束标记，从而可以通过第二个文件结尾来指定有效的最后更新点信息。

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