}

// Underlying system call writes to newoffset via pointer.
// Implemented in assembly to avoid allocation.
func seek(fd int, offset int64, whence int) (newoffset int64, err Errno)

func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
	newoffset, errno := seek(fd, offset, whence)
	if errno != 0 {
		return 0, errno
	}
	return newoffset, nil
}

/**
 * A basic location pointing to a specific part of a file using a global offset and length for coordinates.
 * <p>
 * The coordinates are expected to be zero indexed.
 */
public interface OffsetInFileLocation extends FileLocation {

    /**
     * The global offset from the beginning of the file.
     *
     * @return the zero-indexed the offset
     */
    int getOffset();

    /**

	}
	return
}

func (d *DummyDataGen) Seek(offset int64, whence int) (int64, error) {
	switch whence {
	case io.SeekStart:
		if offset < 0 {
			return 0, errors.New("Invalid offset")
		}
		d.idx = offset
	case io.SeekCurrent:
		if d.idx+offset < 0 {
			return 0, errors.New("Invalid offset")
		}
		d.idx += offset
	case io.SeekEnd:
		if d.length+offset < 0 {
			return 0, errors.New("Invalid offset")
		}

    }

    def "length of common prefix of #prefix with #absolutePath at offset #offset is #result"() {
        expect:
        VfsRelativePath.of(absolutePath, offset).lengthOfCommonPrefix(prefix, caseSensitivity) == result

        where:
        prefix              | absolutePath            | offset | result
        "hello/world"       | "hello/other"           | 0      | 5

			time.Sleep(time.Duration(rand.Intn(100)) * time.Microsecond)
			chunkWords := roundDownToPowerOf2(rand.Intn(maxChunkWords) + 1)
			offset := rand.Intn(chunkWords)

			err := lockedfile.Transform(path, func(data []byte) (chunk []byte, err error) {
				chunk = buf[offset*8 : (offset+chunkWords)*8]

				if len(data)&^7 != len(data) {
					t.Errorf("read %d bytes, but each write is an integer multiple of 8 bytes", len(data))

#ifndef PREBUILT_HEADER_${sourceIdx+offset}_H
#define PREBUILT_HEADER_${sourceIdx+offset}_H

// TODO: Actually do something in this header

		if len(d.info) < 14 {
			return nil, DecodeError{"info", Offset(len(d.info)), "too short"}
		}
		offset = 12
	}
	// Fetch the version, a tiny 16-bit number (1, 2, 3, 4, 5).
	x, y := d.info[offset], d.info[offset+1]
	switch {
	case x == 0 && y == 0:
		return nil, DecodeError{"info", 4, "unsupported version 0"}
	case x == 0:
		d.bigEndian = true
		d.order = binary.BigEndian
	case y == 0:

#ifndef PROJECT_HEADER_${sourceIdx}_H
#define PROJECT_HEADER_${sourceIdx}_H

<% sourceIdx.times { %>
#include "src${it}_h.h"
<% } %>


<% functionCount.times { %>
int C_function_${(it+1)+offset} (); 
int CPP_function_${(it+1)+offset} (); 
<% } %>

	ReparseDataLength uint16
	Reserved          uint16
}

type SymbolicLinkReparseBuffer struct {
	// The integer that contains the offset, in bytes,
	// of the substitute name string in the PathBuffer array,
	// computed as an offset from byte 0 of PathBuffer. Note that
	// this offset must be divided by 2 to get the array index.
	SubstituteNameOffset uint16
	// The integer that contains the length, in bytes, of the

//sys	pread(fd int, p []byte, offset int64) (n int, err error) = SYS_PREAD64
//sys	pwrite(fd int, p []byte, offset int64) (n int, err error) = SYS_PWRITE64
//sys	Renameat(olddirfd int, oldpath string, newdirfd int, newpath string) (err error)
//sys	Select(nfd int, r *FdSet, w *FdSet, e *FdSet, timeout *Timeval) (n int, err error) = SYS__NEWSELECT
//sys	sendfile(outfd int, infd int, offset *int64, count int) (written int, err error) = SYS_SENDFILE64