mirror of
https://github.com/unidoc/unipdf.git
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24648f4481
* Fixing platform indepenedent integer size * Cleared test logs. * Cleared unnecessary int32 * Defined precise integer size for jbig2 segments.
100 lines
2.4 KiB
Go
100 lines
2.4 KiB
Go
/*
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* This file is subject to the terms and conditions defined in
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* file 'LICENSE.md', which is part of this source code package.
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*/
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package segments
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import (
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"fmt"
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"math"
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"strings"
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"github.com/unidoc/unipdf/v3/common"
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"github.com/unidoc/unipdf/v3/internal/jbig2/bitmap"
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"github.com/unidoc/unipdf/v3/internal/jbig2/reader"
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)
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// RegionSegment is the model representing base jbig2 segment region - see 7.4.1.
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type RegionSegment struct {
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r reader.StreamReader
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// Region segment bitmap width, 7.4.1.1
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BitmapWidth uint32
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// Region segment bitmap height, 7.4.1.2
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BitmapHeight uint32
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// Region segment bitmap X location, 7.4.1.3
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XLocation uint32
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// Region segment bitmap Y location, 7.4.1.4
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YLocation uint32
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// Region segment flags, 7.4.1.5
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CombinaionOperator bitmap.CombinationOperator
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}
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// NewRegionSegment creates new Region segment model.
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func NewRegionSegment(r reader.StreamReader) *RegionSegment {
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return &RegionSegment{r: r}
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}
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// String implements the Stringer interface.
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func (r *RegionSegment) String() string {
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sb := &strings.Builder{}
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sb.WriteString("\t[REGION SEGMENT]\n")
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sb.WriteString(fmt.Sprintf("\t\t- Bitmap (width, height) [%dx%d]\n", r.BitmapWidth, r.BitmapHeight))
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sb.WriteString(fmt.Sprintf("\t\t- Location (x,y): [%d,%d]\n", r.XLocation, r.YLocation))
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sb.WriteString(fmt.Sprintf("\t\t- CombinationOperator: %s", r.CombinaionOperator))
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return sb.String()
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}
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// parseHeader parses the RegionSegment header.
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func (r *RegionSegment) parseHeader() error {
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common.Log.Trace("[REGION][PARSE-HEADER] Begin")
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defer func() {
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common.Log.Trace("[REGION][PARSE-HEADER] Finished")
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}()
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temp, err := r.r.ReadBits(32)
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if err != nil {
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return err
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}
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r.BitmapWidth = uint32(temp & math.MaxUint32)
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temp, err = r.r.ReadBits(32)
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if err != nil {
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return err
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}
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r.BitmapHeight = uint32(temp & math.MaxUint32)
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temp, err = r.r.ReadBits(32)
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if err != nil {
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return err
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}
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r.XLocation = uint32(temp & math.MaxUint32)
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temp, err = r.r.ReadBits(32)
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if err != nil {
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return err
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}
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r.YLocation = uint32(temp & math.MaxUint32)
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// Bit 3-7
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r.r.ReadBits(5) // dirty read
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// Bit 0-2
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if err = r.readCombinationOperator(); err != nil {
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return err
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}
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return nil
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}
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func (r *RegionSegment) readCombinationOperator() error {
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temp, err := r.r.ReadBits(3)
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if err != nil {
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return err
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}
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r.CombinaionOperator = bitmap.CombinationOperator(temp & 0xF)
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return nil
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}
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