/
image.go
69 lines (56 loc) · 1.76 KB
/
image.go
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/*
* Copyright 2018-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package count
import (
"fmt"
"os"
)
type Image struct {
MajorVersion int32
MinorVersion int32
Flags int32
ResourceCount int32
Redirects Redirects
Offsets Offsets
Locations Locations
Strings Strings
}
func NewImage(path string) (Image, error) {
var i Image
in, err := os.Open(path)
if err != nil {
return Image{}, fmt.Errorf("unable to open %s\n%w", path, err)
}
h, err := NewHeader(in)
if err != nil {
return Image{}, fmt.Errorf("unable to read header\n%w", err)
}
i.MajorVersion = h.MajorVersion
i.MinorVersion = h.MinorVersion
i.Flags = h.Flags
i.ResourceCount = h.ResourceCount
i.Redirects, err = NewRedirects(in, int32(h.Size()), h.TableLength)
if err != nil {
return Image{}, fmt.Errorf("unable to create redirects\n%w", err)
}
i.Offsets, err = NewOffsets(in, i.Redirects.Offset+int32(i.Redirects.Size()), h.TableLength)
if err != nil {
return Image{}, fmt.Errorf("unable to create offsets\n%w", err)
}
i.Locations = Locations{Offset: i.Offsets.Offset + int32(i.Offsets.Size()), Size: h.LocationsSize, Reader: in}
i.Strings = Strings{Offset: i.Locations.Offset + i.Locations.Size, Reader: in}
return i, nil
}