LZMA SDK使用太多RAM解压缩iOS(xcode)

“7-Zip使用另一个用C编写的多线程解码器.C.7z解码器不需要为整个实体块分配RAM块.另请阅读此线程：

http://sourceforge.net/projects/sevenzip/forums/forum/45797/topic/5655623
“

因此,在有人修复SDK for iOS之前,解决方法是：

1)确定要对文件解压缩操作使用的RAM限制.

2)存档中任何超过上述限制的SINGLE文件必须拆分,您可以使用任何二进制拆分器应用程序(如拆分)执行此操作：
http://www.fourmilab.ch/splits/

3)文件准备好后,使用MoDJ在他的答案中描述的字典/块大小选项创建7z文件,例如24 meg限制：
7za a -mx = 9 -md = 24m -ms = 24m CompressedFile.7z SourceFiles *

4)在iOS应用程序中,解压缩文件后,确定已拆分的文件,并将它们重新连接在一起.这个代码并不是那么复杂(我假设splits.exe使用的命名约定,即file.001,file.002等)

if(iParts>1)
    {
        //If this is a multipart binary split file,we must combine all of the parts before we can use it
        NSString *finalfilePath = whateveryourfinaldestinationfilenameis
        NSString *splitfilePath = [finalfilePath stringByAppendingString:@".001"];

        NSFileHandle *myHandle;
        NSFileManager *fileManager = [NSFileManager defaultManager];
        NSError *error;

        //If the target combined file exists already,remove it
        if ([fileManager fileExistsAtPath:finalfilePath]) 
        {
            BOOL success = [fileManager removeItemAtPath:finalfilePath error:&error];
            if (!success) NSLog(@"Error: %@",[error localizedDescription]);
        }

        myHandle  = [NSFileHandle fileHandleForUpdatingAtPath:splitfilePath];
        NSString *nextPart;
        //Concatenate each piece in order
        for (int i=2; i<=iParts; i++) {
            //Assumes fewer than 100 pieces
            if (i<10) nextPart = [splitfilePath stringByReplacingOccurrencesOfString:@".001" withString:[NSString stringWithFormat:@".00%d",i]];
            else nextPart = [splitfilePath stringByReplacingOccurrencesOfString:@".001" withString:[NSString stringWithFormat:@".0%d",i]];
            NSData *datapart = [[NSData alloc] initWithContentsOfFile:(NSString *)nextPart];
            [myHandle seekToEndOfFile];
            [myHandle writeData:datapart];
        }    
        [myHandle closeFile];
        //Rename concatenated file
        [fileManager moveItemAtPath:splitfilePath toPath:finalfilePath error:&error];
    }