Hi there, Recently I had been working on an iPad app using Flex\AIR, which downloads a database file on the device and works as an offline app.
But since file was very huge(150 - 500MB), I was asked if we can zip the file to cut down the download time on the device. I did try using Airxzip, FZip etc. But all of them ultimately use ByteArray.uncompress() method to unzip the file. It works just fine in case of desktop\web apps. But when it comes to mobile\iPad apps, memory is a huge constraint. When I tried to unzip a zipped file(size was 20MB, uncompressed size was around 80MB) using ByteArray.uncompress(), it worked fine on the device with 512MB RAM. But When I try to unzip a zipped file beyond 100MB(size was 100MB, uncompressed size was around 320MB), the app gets crashed. I felt, since uncompress method tries to unzip the file in a single go, it runs out of memory and apparently the app crashes. Just wanted to know if there is any way we can unzip those huge files byte wise? That is, instead of unzipping the entire file in one single shot, can we keep some predefined buffer size and unzip them? Something like this, which I reckon is in Java: http://stackoverflow.com/questions/14218178/how-to-unzip-large-zip-file-write-to-sdcard-in-less-time ZipArchive for iOS too works very fine for huge file unzipping. I still haven't got any alternative solution to it. I am downloading those huge raw files direclty and using them without unzipping. It's really a pain for the customers to wait for 2 - 3 hours to download the file. Any thoughts on how we can go about it? -Deepak
