Use the right sized byte array for large indexes
Fixes:
@@ -19,14 +19,16 @@ import (
"unsafe"
)
-func mmap(f *os.File, sz int) ([]byte, error) {
- low, high := uint32(sz), uint32(sz>>32)
+const maxMapSize = 0xFFFFFFFFFFFF // 256TB
+
+func mmap(f *os.File, size int) ([]byte, error) {
+ low, high := uint32(size), uint32(size>>32)
h, errno := syscall.CreateFileMapping(syscall.Handle(f.Fd()), nil, syscall.PAGE_READONLY, high, low, nil)
if h == 0 {
return nil, os.NewSyscallError("CreateFileMapping", errno)
}
- addr, errno := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, uintptr(sz))
+ addr, errno := syscall.MapViewOfFile(h, syscall.FILE_MAP_READ, 0, 0, uintptr(size))
if addr == 0 {
return nil, os.NewSyscallError("MapViewOfFile", errno)
}
@@ -35,7 +37,7 @@ func mmap(f *os.File, sz int) ([]byte, error) {
return nil, os.NewSyscallError("CloseHandle", err)
}
- return (*[1 << 30]byte)(unsafe.Pointer(addr))[:sz], nil
+ return (*[maxMapSize]byte)(unsafe.Pointer(addr))[:size], nil
}
func munmap(b []byte) error {
