public static FileSection ReadFileProperty(this Stream stream, byte[] buf, UmdFile file)
{
//#开头
int start = stream.ReadByte();
if (start != '#')
{
stream.Position = stream.Position - 1;
return(null);
}
//两个字节，表示类别
stream.ReadLength(buf, 2);
int type = BitConverter.ToInt16(buf, 0);
if (!IsFileProperty(type))
{
stream.Position = stream.Position - 3;
return(null);
}
//一个无意义字节
stream.ReadByte();
//一个长度的字节
int len = stream.ReadByte() - 5;
stream.ReadLength(buf, len);
var typeEnum = (MetaDataEnum)type;
switch (typeEnum)
{
case MetaDataEnum.FileStart:
return(null);
case MetaDataEnum.Title:
var title = new FileTitleSection
{
Title = Encoding.Unicode.GetString(buf, 0, len)
};
file.Title = title;
return(title);
case MetaDataEnum.Author:
var author = new AuthorSection
{
Author = Encoding.Unicode.GetString(buf, 0, len)
};
file.Author = author;
return(author);
case MetaDataEnum.Year:
var year = new YearSection
{
Year = Encoding.Unicode.GetString(buf, 0, len)
};
if (file.PublishDate == null)
{
file.PublishDate = new PublishDateSection();
}
file.PublishDate.Year = year;
return(year);
case MetaDataEnum.Month:
var month = new MonthSection
{
Month = Encoding.Unicode.GetString(buf, 0, len)
};
if (file.PublishDate == null)
{
file.PublishDate = new PublishDateSection();
}
file.PublishDate.Month = month;
return(month);
case MetaDataEnum.Day:
var day = new DaySection
{
Day = Encoding.Unicode.GetString(buf, 0, len)
};
if (file.PublishDate == null)
{
file.PublishDate = new PublishDateSection();
}
file.PublishDate.Day = day;
return(day);
case MetaDataEnum.NovelType:
var novelType = new NovelTypeSection
{
NovelType = Encoding.Unicode.GetString(buf, 0, len)
};
file.NovelType = novelType;
return(novelType);
case MetaDataEnum.Publisher:
var publisher = new PublisherSection
{
Publisher = Encoding.Unicode.GetString(buf, 0, len)
};
file.Publisher = publisher;
return(publisher);
case MetaDataEnum.Saler:
var saler = new SalerSection
{
Saler = Encoding.Unicode.GetString(buf, 0, len)
};
file.Saler = saler;
return(saler);
case MetaDataEnum.ContentLength:
var contentLength = new ContentLengthSection
{
ContentLength = BitConverter.ToInt32(buf, 0)
};
file.ContentLength = contentLength;
return(contentLength);
default:
return(null);
}
}
public UmdFile Parse(Stream stream)
{
var buf = new byte[33 * 1024];
var file = new UmdFile();
//前四个字节区分文件类型
stream.ReadLength(buf, 4);
//然后是5个固定的字节
stream.ReadLength(buf, 5);
//下面一个字节指定文件类型
var filetype = stream.ReadByte();
if (filetype != 1)
{
throw new Exception("只能读取文件类型的umd文件");
}
//接下来2个随机数
stream.ReadLength(buf, 2);
//接下来读取文件属性02->ob
FileSection p = null;
do
{
p = stream.ReadFileProperty(buf, file);
} while (p != null);
//章节偏移量
file.ChapterOffset = stream.ReadChapterOffset(buf);
//章节标题
file.ChapterTitle = stream.ReadChapterTitle(buf, file.ChapterOffset.ChapterOffset.Count);
//正文
file.Content = stream.ReadContent(buf);
//封面
file.Cover = stream.ReadCover(buf);
//页面偏移
PageOffsetItem pageoffsetItem = null;
do
{
pageoffsetItem = stream.ReadPageOffsetItem(buf);
if (file.PageOffset == null)
{
file.PageOffset = new PageOffsetSection {
PageOffsetCollection = new List <PageOffsetItem>()
};
}
if (pageoffsetItem != null)
{
file.PageOffset.PageOffsetCollection.Add(pageoffsetItem);
}
} while (pageoffsetItem != null);
//文件结束 9个字节
stream.ReadByte();
var end = stream.ReadByte();
if (end != 0x0c)
{
stream.ReadLength(buf, (int)(stream.Length - stream.Position));
Console.WriteLine("文件大小对不上");
}
if (file.Content.Content == null)
{
file.Content.Content = new string[file.ChapterOffset.ChapterOffset.Count];
}
return(file);
}
