You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: image.go
    path of file: ./repos/ipsw/pkg/dyld
    
    the code of the file until where you have to start completion: package dyld

import (
	"bufio"
	"bytes"
	"encoding/binary"
	"fmt"
	"io"
	"os"
	"path/filepath"
	"sort"
	"strings"
	"sync"
	"text/tabwriter"

	"github.com/apex/log"
	"github.com/blacktop/go-macho"
	"github.com/blacktop/go-macho/pkg/trie"
	"github.com/blacktop/go-macho/types"
	"github.com/blacktop/ipsw/internal/utils"
	"github.com/blacktop/ipsw/pkg/disass"
	"github.com/pkg/er
    
func (i *CacheImage) Seek(offset int64, whence int) (int64, error) {
	switch whence {
	default:
		return 0, fmt.Errorf("Seek: invalid whence")
	case io.SeekStart:
		offset += i.base
	case io.SeekCurrent:
		offset += i.off
	case io.SeekEnd:
		offset += i.limit
	}
	// if scinfo := i.cache.GetSubCacheInfo(i.ruuid); scinfo != nil {
	// 	if offset > int64(scinfo.CacheVMOffset) {
	// 		if next := i.cache.GetNextSubCacheInfo(i.ruuid); next != nil {
	// 			if offset <= int64(next.CacheVMOffset) {
	// 				i.ruuid = next.UUID
	// 				offset = offset - int64(scinfo.CacheVMOffset)
	// 			}
	// 		} else {
	// 			return 0, fmt.Errorf("Seek: invalid offset")
	// 		}
	// 	}
	// } else {
	if offset < i.base {
		return 0, fmt.Errorf("Seek: invalid offset")
	}
	// }
	i.off = offset
	return offset - i.base, nil
}