150 lines
3.3 KiB
Go
150 lines
3.3 KiB
Go
/*
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Copyright 2021 The pdfcpu Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package api
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import (
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"io"
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"os"
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"time"
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"github.com/pdfcpu/pdfcpu/pkg/log"
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"github.com/pdfcpu/pdfcpu/pkg/pdfcpu"
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)
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// BookletFromImages creates a booklet from images.
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func BookletFromImages(conf *pdfcpu.Configuration, imageFileNames []string, nup *pdfcpu.NUp) (*pdfcpu.Context, error) {
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if nup.PageDim == nil {
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// Set default paper size.
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nup.PageDim = pdfcpu.PaperSize[nup.PageSize]
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}
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ctx, err := pdfcpu.CreateContextWithXRefTable(conf, nup.PageDim)
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if err != nil {
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return nil, err
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}
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pagesIndRef, err := ctx.Pages()
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if err != nil {
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return nil, err
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}
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// This is the page tree root.
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pagesDict, err := ctx.DereferenceDict(*pagesIndRef)
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if err != nil {
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return nil, err
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}
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err = pdfcpu.BookletFromImages(ctx, imageFileNames, nup, pagesDict, pagesIndRef)
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return ctx, err
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}
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// Booklet arranges PDF pages on larger sheets of paper and writes the result to w.
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func Booklet(rs io.ReadSeeker, w io.Writer, imgFiles, selectedPages []string, nup *pdfcpu.NUp, conf *pdfcpu.Configuration) error {
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if conf == nil {
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conf = pdfcpu.NewDefaultConfiguration()
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}
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conf.Cmd = pdfcpu.BOOKLET
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log.Info.Printf("%s", nup)
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// below is very similar to api.NUp
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var (
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ctx *pdfcpu.Context
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err error
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)
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if nup.ImgInputFile {
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if ctx, err = BookletFromImages(conf, imgFiles, nup); err != nil {
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return err
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}
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} else {
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if ctx, _, _, err = readAndValidate(rs, conf, time.Now()); err != nil {
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return err
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}
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if err := ctx.EnsurePageCount(); err != nil {
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return err
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}
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pages, err := PagesForPageSelection(ctx.PageCount, selectedPages, true)
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if err != nil {
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return err
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}
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if err = ctx.BookletFromPDF(pages, nup); err != nil {
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return err
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}
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}
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if conf.ValidationMode != pdfcpu.ValidationNone {
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if err = ValidateContext(ctx); err != nil {
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return err
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}
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}
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if err = WriteContext(ctx, w); err != nil {
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return err
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}
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log.Stats.Printf("XRefTable:\n%s\n", ctx)
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return nil
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}
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// BookletFile rearranges PDF pages or images into a booklet layout and writes the result to outFile.
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func BookletFile(inFiles []string, outFile string, selectedPages []string, nup *pdfcpu.NUp, conf *pdfcpu.Configuration) (err error) {
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//if nup.ImgInputFile {
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// return fmt.Errorf("image file input not yet supported for booklet")
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//}
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var f1, f2 *os.File
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// booklet from a PDF
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if f1, err = os.Open(inFiles[0]); err != nil {
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return err
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}
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if f2, err = os.Create(outFile); err != nil {
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return err
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}
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log.CLI.Printf("writing %s...\n", outFile)
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defer func() {
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if err != nil {
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if f1 != nil {
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f1.Close()
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}
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f2.Close()
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return
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}
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if f1 != nil {
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if err = f1.Close(); err != nil {
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return
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}
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}
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err = f2.Close()
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return
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}()
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return Booklet(f1, f2, inFiles, selectedPages, nup, conf)
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}
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