reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 1 | #include "SkMMapStream.h" |
| 2 | |
| 3 | #include <unistd.h> |
| 4 | #include <sys/mman.h> |
| 5 | #include <fcntl.h> |
| 6 | #include <errno.h> |
| 7 | |
| 8 | SkMMAPStream::SkMMAPStream(const char filename[]) |
| 9 | { |
| 10 | fFildes = -1; // initialize to failure case |
| 11 | |
| 12 | int fildes = open(filename, O_RDONLY); |
| 13 | if (fildes < 0) |
| 14 | { |
| 15 | SkDEBUGF(("---- failed to open(%s) for mmap stream error=%d\n", filename, errno)); |
| 16 | return; |
| 17 | } |
| 18 | |
| 19 | off_t size = lseek(fildes, 0, SEEK_END); // find the file size |
| 20 | if (size == -1) |
| 21 | { |
| 22 | SkDEBUGF(("---- failed to lseek(%s) for mmap stream error=%d\n", filename, errno)); |
| 23 | close(fildes); |
| 24 | return; |
| 25 | } |
| 26 | (void)lseek(fildes, 0, SEEK_SET); // restore file offset to beginning |
| 27 | |
| 28 | void* addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fildes, 0); |
| 29 | if (MAP_FAILED == addr) |
| 30 | { |
| 31 | SkDEBUGF(("---- failed to mmap(%s) for mmap stream error=%d\n", filename, errno)); |
| 32 | close(fildes); |
| 33 | return; |
| 34 | } |
| 35 | |
| 36 | this->INHERITED::setMemory(addr, size); |
| 37 | |
| 38 | fFildes = fildes; |
| 39 | fAddr = addr; |
| 40 | fSize = size; |
| 41 | } |
| 42 | |
| 43 | SkMMAPStream::~SkMMAPStream() |
| 44 | { |
| 45 | this->closeMMap(); |
| 46 | } |
| 47 | |
| 48 | void SkMMAPStream::setMemory(const void* data, size_t length) |
| 49 | { |
| 50 | this->closeMMap(); |
| 51 | this->INHERITED::setMemory(data, length); |
| 52 | } |
| 53 | |
| 54 | void SkMMAPStream::closeMMap() |
| 55 | { |
| 56 | if (fFildes >= 0) |
| 57 | { |
| 58 | munmap(fAddr, fSize); |
| 59 | close(fFildes); |
| 60 | fFildes = -1; |
| 61 | } |
| 62 | } |
| 63 | |