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| 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", filenam
e, 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 | |
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