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pdfium.go
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pdfium.go
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package pdfium
import (
"errors"
"fmt"
"github.com/chooban/progger/scan/api"
"github.com/chooban/progger/scan/internal/pdf"
"github.com/go-logr/logr"
"github.com/klippa-app/go-pdfium"
"github.com/klippa-app/go-pdfium/references"
"github.com/klippa-app/go-pdfium/requests"
"github.com/klippa-app/go-pdfium/responses"
"math"
"os"
"slices"
"strings"
)
func NewPdfiumReader(log logr.Logger) *Reader {
return &Reader{
Log: log,
Instance: Instance,
}
}
type Reader struct {
Log logr.Logger
Instance pdfium.Pdfium
}
func (p *Reader) Bookmarks(filename string) ([]pdf.EpisodeDetails, error) {
contents, err := os.ReadFile(filename)
doc, err := p.Instance.OpenDocument(&requests.OpenDocument{
File: &contents,
})
if err != nil {
p.Log.Error(err, "Could not open file with pdfium")
return nil, errors.New("failed to read bookmarks")
}
defer p.Instance.FPDF_CloseDocument(&requests.FPDF_CloseDocument{
Document: doc.Document,
})
pdfiumBookmarks, err := p.Instance.GetBookmarks(&requests.GetBookmarks{
Document: doc.Document,
})
pageCount, err := p.Instance.FPDF_GetPageCount(&requests.FPDF_GetPageCount{Document: doc.Document})
bookmarks := make([]pdf.Bookmark, len(pdfiumBookmarks.Bookmarks))
for i, v := range pdfiumBookmarks.Bookmarks {
b := pdf.Bookmark{
Title: v.Title,
PageFrom: v.DestInfo.PageIndex + 1, // It's zero indexed
}
if i < len(bookmarks)-1 {
b.PageThru = pdfiumBookmarks.Bookmarks[i+1].DestInfo.PageIndex
} else {
b.PageThru = pageCount.PageCount
}
bookmarks[i] = b
}
details := make([]pdf.EpisodeDetails, len(bookmarks))
for i, v := range bookmarks {
details[i] = pdf.EpisodeDetails{
Bookmark: v,
}
}
return details, nil
}
func (p *Reader) Build(episodes []api.ExportPage, outputPath string) {
destination, err := p.Instance.FPDF_CreateNewDocument(&requests.FPDF_CreateNewDocument{})
if err != nil {
p.Log.Error(err, "Could not create new document")
}
pageCount := 0
var source *responses.FPDF_LoadDocument
for _, episode := range episodes {
if source, err = p.Instance.FPDF_LoadDocument(&requests.FPDF_LoadDocument{
Path: &episode.Filename,
}); err != nil {
p.Log.Error(err, "Could not open source PDF", "file_name", episode.Filename)
continue
}
pageRange := fmt.Sprintf("%d-%d", episode.PageFrom, episode.PageTo)
p.Log.V(1).Info("Adding pages", "page_range", pageRange, "index", pageCount, "filename", episode.Filename)
if _, err = p.Instance.FPDF_ImportPages(&requests.FPDF_ImportPages{
Source: source.Document,
Destination: destination.Document,
PageRange: &pageRange,
Index: pageCount,
}); err != nil {
p.Log.Error(err, "Could not import pages", "file_name", episode.Filename)
continue
}
pageCount += (episode.PageTo - episode.PageFrom) + 1
}
if saveAsCopy, err := p.Instance.FPDF_SaveAsCopy(&requests.FPDF_SaveAsCopy{
Flags: requests.SaveFlagIncremental,
Document: destination.Document,
FilePath: &outputPath,
}); err != nil {
p.Log.Error(err, "Could not save document", "file_name", outputPath)
} else {
p.Log.Info("file saved", "file_name", *saveAsCopy.FilePath)
}
}
func (p *Reader) Credits(filename string, startPage int, endPage int) (credits string, err error) {
source, err := p.Instance.FPDF_LoadDocument(&requests.FPDF_LoadDocument{
Path: &filename,
})
defer func() {
_, err := p.Instance.FPDF_CloseDocument(&requests.FPDF_CloseDocument{Document: source.Document})
if err != nil {
p.Log.Info("Could not close source", "file_name", filename)
return
}
}()
if err != nil {
p.Log.Error(err, "Could not open file")
return "", err
}
p.Log.V(1).Info(fmt.Sprintf("Reading %s", filename))
var creditTypes = []string{"script", "art", "colours", "letters"}
var textPage *responses.FPDFText_LoadPage
var scriptRect *responses.FPDFText_GetRect
for pageIndex := startPage; pageIndex <= endPage; pageIndex++ {
p.Log.V(1).Info(fmt.Sprintf("Scanning page %d of %s", pageIndex, filename))
if pdfPage, err := p.Instance.FPDF_LoadPage(&requests.FPDF_LoadPage{
Document: source.Document,
Index: pageIndex - 1,
}); err != nil {
p.Log.Error(err, fmt.Sprintf("Failed to load page %d", pageIndex))
return "", errors.New("failed to load page")
} else {
if textPage, scriptRect = p.findScriptRect(pdfPage.Page); scriptRect != nil {
p.Instance.FPDF_ClosePage(&requests.FPDF_ClosePage{
Page: pdfPage.Page,
})
break
}
}
}
if scriptRect == nil {
return "", errors.New("no script found in range")
}
var (
left = scriptRect.Left - ((scriptRect.Right - scriptRect.Left) * 1.1)
right = scriptRect.Right + ((scriptRect.Right - scriptRect.Left) * 1.1)
top = scriptRect.Top + 20
bottom = scriptRect.Bottom - 20
rawCredits = "script"
)
for bottom >= 0 {
creditsText, _ := p.Instance.FPDFText_GetBoundedText(&requests.FPDFText_GetBoundedText{
TextPage: textPage.TextPage,
Left: left,
Right: right,
Bottom: bottom,
Top: top,
})
if creditsText.Text != rawCredits {
rawCredits = creditsText.Text
bottom -= 20
continue
}
break
}
tokenized := strings.Fields(strings.ToLower(strings.ReplaceAll(rawCredits, "\r\n", " ")))
earliestIdx := math.MaxInt16
latestIdx := math.MinInt16
for _, v := range creditTypes {
cIdx := slices.Index(tokenized, v)
if cIdx >= 0 {
earliestIdx = min(cIdx, earliestIdx)
latestIdx = max(cIdx, latestIdx)
}
}
tmpCredits := tokenized[earliestIdx:min(latestIdx+4, len(tokenized))]
credits = strings.Join(tmpCredits, " ")
return credits, nil
}
func (p *Reader) findScriptRect(pageRef references.FPDF_PAGE) (*responses.FPDFText_LoadPage, *responses.FPDFText_GetRect) {
var (
textPage *responses.FPDFText_LoadPage
scriptRect *responses.FPDFText_GetRect
)
textPage, _ = p.Instance.FPDFText_LoadPage(&requests.FPDFText_LoadPage{
Page: requests.Page{
ByReference: &pageRef,
ByIndex: nil,
},
})
rects, _ := p.Instance.FPDFText_CountRects(&requests.FPDFText_CountRects{
TextPage: textPage.TextPage,
StartIndex: 0,
Count: -1,
})
for textRectIndex := 0; textRectIndex < rects.Count; textRectIndex++ {
rect, _ := p.Instance.FPDFText_GetRect(&requests.FPDFText_GetRect{
TextPage: textPage.TextPage,
Index: textRectIndex,
})
text, _ := p.Instance.FPDFText_GetBoundedText(&requests.FPDFText_GetBoundedText{
TextPage: textPage.TextPage,
Left: rect.Left,
Top: rect.Top,
Right: rect.Right,
Bottom: rect.Bottom,
})
if strings.ToLower(text.Text) == "script" {
p.Log.V(1).Info(fmt.Sprintf("Found script at %+v", rect))
scriptRect = rect
}
}
return textPage, scriptRect
}