[android-porting] Re: FAT32 file size limited to 2GB
I have a lot of updates on this thread, but no breakthroughs: --- I enabled NTFS support in my 2.6.32 kernel build: Steps: edit the .config file, added CONFIG_NTFS_FS=y and CONFIG_NTFS_RW=y The ADP1 still would not recognize an NTFS-formatted memory card. I also did more digging into why OpenCORE fails to play back a 2.1GB file. In PVMFRecognizerRegistryImpl::CheckForDataAvailability(), it calls iDataStream-OpenSession(). iDataStream is a PVMIDataStreamSyncInterfaceRefImpl object. Internally it creates a new iFileObject [result == 0]. Then it seeks to the end of the file to try to determine file size [iFileNumBytes = (TOsclFileOffsetInt32)iFileObject-Tell()] before trying to reset the file position back to the beginning. Next, PVMFRecognizerRegistryImpl::CheckForDataAvailability() calls iDataStream-QueryReadCapacity(). This calls GetCurrentPointerPosition(), which calls iFileObject- Tell(), which returns -1 and causes a Leave 103. It looks like an I/ O limitation. --- Other things I've discovered: On http://opencore.net/files/OpenCORE_roadmap.pdf, PV plans to add large file support to MP4 in May of 2010. In my Donut_plus_aosp build, I see OSCL_HAS_LARGE_FILE_SUPPORT = 1 in osclconfig_io.h. Does anyone know what a large file is by PV's standards? --- Thanks for any ideas, ~Andrew On Mar 14, 10:07 pm, Hedge awoo...@gmail.com wrote: Specifically I'm trying to playback files in OpenCORE, not with an NDK app, but as a test app it might be useful. Using NTFS sounds like it might pan out too. Thanks for the tips everyone, and I'll try them out when I get back in the office. On Mar 13, 6:48 pm, Dianne Hackborn hack...@android.com wrote: On Fri, Mar 12, 2010 at 4:50 PM, Hedge awoo...@gmail.com wrote: Has anyone heard if this will be fixed in Android 3.0? I haven't even heard of Android 3.0. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
Re: [android-porting] Re: FAT32 file size limited to 2GB
NTFS doesn't have this limitation. Adding this to the kernel is not a big deal. Also NTFS FS is abstracted by the kernel so bionic should not care what is below the bonnet. What needs to be checked is the mount command whether this for some reason would not allow NTFS mounts. On Sat, Mar 13, 2010 at 1:50 AM, Hedge awoo...@gmail.com wrote: No, I'm not sure how to add NTFS to the kernel. If the 2GB limitations apply to the Linux kernel or bionic libraries, would NTFS even help? I'd prefer to add 4GB capabilities to FAT32 if possible. As far as the FAT32 2GB limits, I see _FILE_OFFSET_BITS == 64 in some files (http://www.gnu.org/software/libc/manual/html_node/Opening- Streams.html#index-fopen64-931http://www.gnu.org/software/libc/manual/html_node/Opening-%0AStreams.html#index-fopen64-931). I wrote test programs for low-level file access in Java and C and I can open large files there. However, seeks fail beyond the 2GB limit, probably because the offset variable (off_t) is a 4-byte long. Has anyone heard if this will be fixed in Android 3.0? On Mar 9, 5:07 pm, hedwin hedwin.kon...@gmail.com wrote: Did you configure NTFS in your kernel?. Think it is disabled per default (only checked android-x86). On Tue, Mar 9, 2010 at 11:31 PM, Hedge awoo...@gmail.com wrote: Thanks everyone for your help so far. A few more things: * FAT32 is not limited to 2GB: http://en.wikipedia.org/wiki/File_Allocation_Table#FAT32 (The maximum possible size for a file on a FAT32 volume is 4 GB minus 1 byte) * I did try formatting an SDHC card as NTFS but unfortunately the Android device would not recognize it. Also, ext3 wouldn't work on most Windows users' machines without downloading additional programs. * I'm surprised this issue hasn't caused more of a stir before. I only found one other mention of it (http://groups.google.com/group/android- platform/browse_thread/thread/7c375594e5cc5427/2f397fe2eb829bae? lnk=gstq=file+size+limit#2f397fe2eb829bae http://groups.google.com/group/android-%0Aplatform/browse_thread/thre... ) On Mar 9, 2:24 pm, Hedge awoo...@gmail.com wrote: I found this bit of info about a 2GB limit in Linux kernels before v2.4.0 (http://linuxmafia.com/faq/VALinux-kb/2gb-filesize- limit.html). But Android appears to be using v2.6 (http:// en.wikipedia.org/wiki/Android_%28operating_system %29#Open_Handset_Alliance). On Mar 9, 1:37 pm, Deva R r.deva...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. nope.. may be you meant FAT16. fat32 max file size is 232-1 bytes (~4GB). it looks odd why access beyond 2G should fail. As chris said below, there might be a break in i/o lib. On Wed, Mar 10, 2010 at 2:52 AM, hedwin hedwin.kon...@gmail.com wrote: FAT32 itself is limited to 2GB. If you need to handle files larger than 2GB you either need to use NTFS or ext3 or higher. On Tue, Mar 9, 2010 at 4:12 AM, Chris Stratton cs07...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com android-porting%2bunsubscr...@googlegroups.comandroid-porting%252bunsubscr...@googlegroups.com android-porting%2bunsubscr...@googlegroups.comandroid-porting%252bunsubscr...@googlegroups.com android-porting%252bunsubscr...@googlegroups.comandroid-porting%25252bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com android-porting%2bunsubscr...@googlegroups.comandroid-porting%252bunsubscr...@googlegroups.com android-porting%2bunsubscr...@googlegroups.comandroid-porting%252bunsubscr...@googlegroups.com
[android-porting] Re: FAT32 file size limited to 2GB
Try writing something in the ndk (or a command line executable if you have the toolchain wrapper scripts) explicitly using 64 bit file io. And compile and test it against a fat32 volume on a normal linux box first. Hedge wrote: Thanks everyone for your help so far. A few more things: * FAT32 is not limited to 2GB: http://en.wikipedia.org/wiki/File_Allocation_Table#FAT32 (The maximum possible size for a file on a FAT32 volume is 4 GB minus 1 byte) * I did try formatting an SDHC card as NTFS but unfortunately the Android device would not recognize it. Also, ext3 wouldn't work on most Windows users' machines without downloading additional programs. * I'm surprised this issue hasn't caused more of a stir before. I only found one other mention of it (http://groups.google.com/group/android- platform/browse_thread/thread/7c375594e5cc5427/2f397fe2eb829bae? lnk=gstq=file+size+limit#2f397fe2eb829bae) On Mar 9, 2:24 pm, Hedge awoo...@gmail.com wrote: I found this bit of info about a 2GB limit in Linux kernels before v2.4.0 (http://linuxmafia.com/faq/VALinux-kb/2gb-filesize- limit.html). But Android appears to be using v2.6 (http:// en.wikipedia.org/wiki/Android_%28operating_system %29#Open_Handset_Alliance). On Mar 9, 1:37 pm, Deva R r.deva...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. nope.. may be you meant FAT16. fat32 max file size is 232-1 bytes (~4GB). it looks odd why access beyond 2G should fail. As chris said below, there might be a break in i/o lib. On Wed, Mar 10, 2010 at 2:52 AM, hedwin hedwin.kon...@gmail.com wrote: FAT32 itself is limited to 2GB. If you need to handle files larger than 2GB you either need to use NTFS or ext3 or higher. On Tue, Mar 9, 2010 at 4:12 AM, Chris Stratton cs07...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
Re: [android-porting] Re: FAT32 file size limited to 2GB
On Fri, Mar 12, 2010 at 4:50 PM, Hedge awoo...@gmail.com wrote: Has anyone heard if this will be fixed in Android 3.0? I haven't even heard of Android 3.0. -- Dianne Hackborn Android framework engineer hack...@android.com Note: please don't send private questions to me, as I don't have time to provide private support, and so won't reply to such e-mails. All such questions should be posted on public forums, where I and others can see and answer them. -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
[android-porting] Re: FAT32 file size limited to 2GB
No, I'm not sure how to add NTFS to the kernel. If the 2GB limitations apply to the Linux kernel or bionic libraries, would NTFS even help? I'd prefer to add 4GB capabilities to FAT32 if possible. As far as the FAT32 2GB limits, I see _FILE_OFFSET_BITS == 64 in some files (http://www.gnu.org/software/libc/manual/html_node/Opening- Streams.html#index-fopen64-931). I wrote test programs for low-level file access in Java and C and I can open large files there. However, seeks fail beyond the 2GB limit, probably because the offset variable (off_t) is a 4-byte long. Has anyone heard if this will be fixed in Android 3.0? On Mar 9, 5:07 pm, hedwin hedwin.kon...@gmail.com wrote: Did you configure NTFS in your kernel?. Think it is disabled per default (only checked android-x86). On Tue, Mar 9, 2010 at 11:31 PM, Hedge awoo...@gmail.com wrote: Thanks everyone for your help so far. A few more things: * FAT32 is not limited to 2GB: http://en.wikipedia.org/wiki/File_Allocation_Table#FAT32 (The maximum possible size for a file on a FAT32 volume is 4 GB minus 1 byte) * I did try formatting an SDHC card as NTFS but unfortunately the Android device would not recognize it. Also, ext3 wouldn't work on most Windows users' machines without downloading additional programs. * I'm surprised this issue hasn't caused more of a stir before. I only found one other mention of it (http://groups.google.com/group/android- platform/browse_thread/thread/7c375594e5cc5427/2f397fe2eb829bae? lnk=gstq=file+size+limit#2f397fe2eb829baehttp://groups.google.com/group/android-%0Aplatform/browse_thread/thre... ) On Mar 9, 2:24 pm, Hedge awoo...@gmail.com wrote: I found this bit of info about a 2GB limit in Linux kernels before v2.4.0 (http://linuxmafia.com/faq/VALinux-kb/2gb-filesize- limit.html). But Android appears to be using v2.6 (http:// en.wikipedia.org/wiki/Android_%28operating_system %29#Open_Handset_Alliance). On Mar 9, 1:37 pm, Deva R r.deva...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. nope.. may be you meant FAT16. fat32 max file size is 232-1 bytes (~4GB). it looks odd why access beyond 2G should fail. As chris said below, there might be a break in i/o lib. On Wed, Mar 10, 2010 at 2:52 AM, hedwin hedwin.kon...@gmail.com wrote: FAT32 itself is limited to 2GB. If you need to handle files larger than 2GB you either need to use NTFS or ext3 or higher. On Tue, Mar 9, 2010 at 4:12 AM, Chris Stratton cs07...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com android-porting%2bunsubscr...@googlegroups.comandroid-porting%252bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com android-porting%2bunsubscr...@googlegroups.comandroid-porting%252bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
Re: [android-porting] Re: FAT32 file size limited to 2GB
FAT32 itself is limited to 2GB. If you need to handle files larger than 2GB you either need to use NTFS or ext3 or higher. On Tue, Mar 9, 2010 at 4:12 AM, Chris Stratton cs07...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
Re: [android-porting] Re: FAT32 file size limited to 2GB
The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. nope.. may be you meant FAT16. fat32 max file size is 232-1 bytes (~4GB). it looks odd why access beyond 2G should fail. As chris said below, there might be a break in i/o lib. On Wed, Mar 10, 2010 at 2:52 AM, hedwin hedwin.kon...@gmail.com wrote: FAT32 itself is limited to 2GB. If you need to handle files larger than 2GB you either need to use NTFS or ext3 or higher. On Tue, Mar 9, 2010 at 4:12 AM, Chris Stratton cs07...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
[android-porting] Re: FAT32 file size limited to 2GB
I found this bit of info about a 2GB limit in Linux kernels before v2.4.0 (http://linuxmafia.com/faq/VALinux-kb/2gb-filesize- limit.html). But Android appears to be using v2.6 (http:// en.wikipedia.org/wiki/Android_%28operating_system %29#Open_Handset_Alliance). On Mar 9, 1:37 pm, Deva R r.deva...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. nope.. may be you meant FAT16. fat32 max file size is 232-1 bytes (~4GB). it looks odd why access beyond 2G should fail. As chris said below, there might be a break in i/o lib. On Wed, Mar 10, 2010 at 2:52 AM, hedwin hedwin.kon...@gmail.com wrote: FAT32 itself is limited to 2GB. If you need to handle files larger than 2GB you either need to use NTFS or ext3 or higher. On Tue, Mar 9, 2010 at 4:12 AM, Chris Stratton cs07...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
[android-porting] Re: FAT32 file size limited to 2GB
Thanks everyone for your help so far. A few more things: * FAT32 is not limited to 2GB: http://en.wikipedia.org/wiki/File_Allocation_Table#FAT32 (The maximum possible size for a file on a FAT32 volume is 4 GB minus 1 byte) * I did try formatting an SDHC card as NTFS but unfortunately the Android device would not recognize it. Also, ext3 wouldn't work on most Windows users' machines without downloading additional programs. * I'm surprised this issue hasn't caused more of a stir before. I only found one other mention of it (http://groups.google.com/group/android- platform/browse_thread/thread/7c375594e5cc5427/2f397fe2eb829bae? lnk=gstq=file+size+limit#2f397fe2eb829bae) On Mar 9, 2:24 pm, Hedge awoo...@gmail.com wrote: I found this bit of info about a 2GB limit in Linux kernels before v2.4.0 (http://linuxmafia.com/faq/VALinux-kb/2gb-filesize- limit.html). But Android appears to be using v2.6 (http:// en.wikipedia.org/wiki/Android_%28operating_system %29#Open_Handset_Alliance). On Mar 9, 1:37 pm, Deva R r.deva...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. nope.. may be you meant FAT16. fat32 max file size is 232-1 bytes (~4GB). it looks odd why access beyond 2G should fail. As chris said below, there might be a break in i/o lib. On Wed, Mar 10, 2010 at 2:52 AM, hedwin hedwin.kon...@gmail.com wrote: FAT32 itself is limited to 2GB. If you need to handle files larger than 2GB you either need to use NTFS or ext3 or higher. On Tue, Mar 9, 2010 at 4:12 AM, Chris Stratton cs07...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
Re: [android-porting] Re: FAT32 file size limited to 2GB
Did you configure NTFS in your kernel?. Think it is disabled per default (only checked android-x86). On Tue, Mar 9, 2010 at 11:31 PM, Hedge awoo...@gmail.com wrote: Thanks everyone for your help so far. A few more things: * FAT32 is not limited to 2GB: http://en.wikipedia.org/wiki/File_Allocation_Table#FAT32 (The maximum possible size for a file on a FAT32 volume is 4 GB minus 1 byte) * I did try formatting an SDHC card as NTFS but unfortunately the Android device would not recognize it. Also, ext3 wouldn't work on most Windows users' machines without downloading additional programs. * I'm surprised this issue hasn't caused more of a stir before. I only found one other mention of it (http://groups.google.com/group/android- platform/browse_thread/thread/7c375594e5cc5427/2f397fe2eb829bae? lnk=gstq=file+size+limit#2f397fe2eb829baehttp://groups.google.com/group/android-%0Aplatform/browse_thread/thread/7c375594e5cc5427/2f397fe2eb829bae?%0Alnk=gstq=file+size+limit#2f397fe2eb829bae ) On Mar 9, 2:24 pm, Hedge awoo...@gmail.com wrote: I found this bit of info about a 2GB limit in Linux kernels before v2.4.0 (http://linuxmafia.com/faq/VALinux-kb/2gb-filesize- limit.html). But Android appears to be using v2.6 (http:// en.wikipedia.org/wiki/Android_%28operating_system %29#Open_Handset_Alliance). On Mar 9, 1:37 pm, Deva R r.deva...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. nope.. may be you meant FAT16. fat32 max file size is 232-1 bytes (~4GB). it looks odd why access beyond 2G should fail. As chris said below, there might be a break in i/o lib. On Wed, Mar 10, 2010 at 2:52 AM, hedwin hedwin.kon...@gmail.com wrote: FAT32 itself is limited to 2GB. If you need to handle files larger than 2GB you either need to use NTFS or ext3 or higher. On Tue, Mar 9, 2010 at 4:12 AM, Chris Stratton cs07...@gmail.com wrote: The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com android-porting%2bunsubscr...@googlegroups.comandroid-porting%252bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com android-porting%2bunsubscr...@googlegroups.comandroid-porting%252bunsubscr...@googlegroups.com website:http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.comandroid-porting%2bunsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
[android-porting] Re: FAT32 file size limited to 2GB
The underlying file i/o c library calls are likely to be the common 32 bit signed versions unless someone specifically chose the 64 bit versions. On Mar 8, 1:13 pm, Hedge awoo...@gmail.com wrote: I am trying to play back 3GB videos from an SDHC card in OpenCORE v2.05 in Cupcake. The player crashes every time. ADB shell reports the file size to be a negative number (overflow). I believe the maximum file size on FAT32 is 4GB (2^32 - 1). The maximum size I can access on Android is actually 2GB (2^31 - 1), which makes me think the addressing is performed with a signed integer instead of unsigned. Does anyone know how to access files that are larger than 2GB? Was this fixed in a later version of Android? Can I change the type of some kernel variable to an unsigned int to unlock the extra addressing space? -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting