mirror of
https://github.com/unidoc/unipdf.git
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e85616cec2
* Prepared skeleton and basic component implementations for the jbig2 encoding. * Added Bitset. Implemented Bitmap. * Decoder with old Arithmetic Decoder * Partly working arithmetic * Working arithmetic decoder. * MMR patched. * rebuild to apache. * Working generic * Decoded full document * Decoded AnnexH document * Minor issues fixed. * Update README.md * Fixed generic region errors. Added benchmark. Added bitmap unpadder. Added Bitmap toImage method. * Fixed endofpage error * Added integration test. * Decoded all test files without errors. Implemented JBIG2Global. * Merged with v3 version * Fixed the EOF in the globals issue * Fixed the JBIG2 ChocolateData Decode * JBIG2 Added license information * Minor fix in jbig2 encoding. * Applied the logging convention * Cleaned unnecessary imports * Go modules clear unused imports * checked out the README.md * Moved trace to Debug. Fixed the build integrate tag in the document_decode_test.go * Applied UniPDF Developer Guide. Fixed lint issues. * Cleared documentation, fixed style issues. * Added jbig2 doc.go files. Applied unipdf guide style. * Minor code style changes. * Minor naming and style issues fixes. * Minor naming changes. Style issues fixed. * Review r11 fixes. * Integrate jbig2 tests with build system * Added jbig2 integration test golden files. * Minor jbig2 integration test fix * Removed jbig2 integration image assertions * Fixed jbig2 rowstride issue. Implemented jbig2 bit writer * Changed golden files logic. Fixes r13 issues.
111 lines
2.3 KiB
Go
111 lines
2.3 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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"github.com/unidoc/unipdf/v3/internal/jbig2/decoder/huffman"
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"github.com/unidoc/unipdf/v3/internal/jbig2/reader"
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)
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// TableSegment is the model used for user defined Huffman Table Segment - see 7.4.13 and appendix B.
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type TableSegment struct {
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r reader.StreamReader
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// Code Table Flags B.2.1
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htOutOfBand int
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htPS int
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htRS int
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// Code Table lowest value B.2.2
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htLow int
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// Code Table highest value B.2.3
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htHight int
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}
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// Compile time check if the TableSegment implements huffman.BasicTabler.
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var _ huffman.BasicTabler = &TableSegment{}
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// Init initializes the table segment.
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// Implements Segmenter interface.
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func (t *TableSegment) Init(h *Header, r reader.StreamReader) error {
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t.r = r
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return t.parseHeader()
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}
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// HtPS implements huffman.BasicTabler interface.
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func (t *TableSegment) HtPS() int {
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return t.htPS
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}
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// HtRS implements huffman.BasicTabler interface.
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func (t *TableSegment) HtRS() int {
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return t.htRS
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}
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// HtLow implements huffman.BasicTabler interface.
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func (t *TableSegment) HtLow() int {
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return t.htLow
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}
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// HtHigh implements huffman.BasicTabler interface.
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func (t *TableSegment) HtHigh() int {
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return t.htHight
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}
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// HtOOB implements huffman.BasicTabler interface.
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func (t *TableSegment) HtOOB() int {
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return t.htOutOfBand
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}
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// StreamReader implements huffman.BasicTabler interface.
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func (t *TableSegment) StreamReader() reader.StreamReader {
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return t.r
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}
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func (t *TableSegment) parseHeader() error {
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var (
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bit int
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bits uint64
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err error
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)
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bit, err = t.r.ReadBit()
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if err != nil {
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return err
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}
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if bit == 1 {
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return fmt.Errorf("invalid table segment definition. B.2.1 Code Table flags: Bit 7 must be zero. Was: %d", bit)
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}
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// Bit 4-6
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if bits, err = t.r.ReadBits(3); err != nil {
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return err
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}
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t.htRS = (int(bits) + 1) & 0xf
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// Bit 1-3
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if bits, err = t.r.ReadBits(3); err != nil {
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return err
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}
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t.htPS = (int(bits) + 1) & 0xf
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// 4 bytes
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if bits, err = t.r.ReadBits(32); err != nil {
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return err
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}
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t.htLow = int(bits & 0xffffffff)
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// 4 bytes
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if bits, err = t.r.ReadBits(32); err != nil {
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return err
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}
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t.htHight = int(bits & 0xffffffff)
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return nil
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}
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