| |
| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "SkMMapStream.h" |
| |
| #include <unistd.h> |
| #include <sys/mman.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| |
| SkMMAPStream::SkMMAPStream(const char filename[]) |
| { |
| fFildes = -1; // initialize to failure case |
| |
| int fildes = open(filename, O_RDONLY); |
| if (fildes < 0) |
| { |
| SkDEBUGF(("---- failed to open(%s) for mmap stream error=%d\n", filename, errno)); |
| return; |
| } |
| |
| off_t offset = lseek(fildes, 0, SEEK_END); // find the file size |
| if (offset == -1) |
| { |
| SkDEBUGF(("---- failed to lseek(%s) for mmap stream error=%d\n", filename, errno)); |
| close(fildes); |
| return; |
| } |
| (void)lseek(fildes, 0, SEEK_SET); // restore file offset to beginning |
| |
| // to avoid a 64bit->32bit warning, I explicitly create a size_t size |
| size_t size = static_cast<size_t>(offset); |
| |
| void* addr = mmap(NULL, size, PROT_READ, MAP_SHARED, fildes, 0); |
| if (MAP_FAILED == addr) |
| { |
| SkDEBUGF(("---- failed to mmap(%s) for mmap stream error=%d\n", filename, errno)); |
| close(fildes); |
| return; |
| } |
| |
| this->INHERITED::setMemory(addr, size); |
| |
| fFildes = fildes; |
| fAddr = addr; |
| fSize = size; |
| } |
| |
| SkMMAPStream::~SkMMAPStream() |
| { |
| this->closeMMap(); |
| } |
| |
| void SkMMAPStream::setMemory(const void* data, size_t length, bool copyData) |
| { |
| this->closeMMap(); |
| this->INHERITED::setMemory(data, length, copyData); |
| } |
| |
| void SkMMAPStream::closeMMap() |
| { |
| if (fFildes >= 0) |
| { |
| munmap(fAddr, fSize); |
| close(fFildes); |
| fFildes = -1; |
| } |
| } |
| |