1 files changed, 63 insertions, 0 deletions
diff --git a/skia/images/SkMMapStream.cpp b/skia/images/SkMMapStream.cpp
new file mode 100644
index 0000000..2aee945
--- /dev/null
+++ b/skia/images/SkMMapStream.cpp
@@ -0,0 +1,63 @@
+#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 size = lseek(fildes, 0, SEEK_END);    // find the file size
+    if (size == -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
+
+    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)
+{
+    this->closeMMap();
+    this->INHERITED::setMemory(data, length);
+}
+
+void SkMMAPStream::closeMMap()
+{
+    if (fFildes >= 0)
+    {
+        munmap(fAddr, fSize);
+        close(fFildes);
+        fFildes = -1;
+    }
+}
+