110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
/*
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Copyright 2020 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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// Trim generates a trimmed version of rs
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// containing all selected pages and writes the result to w.
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func Trim(rs io.ReadSeeker, w io.Writer, selectedPages []string, 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.TRIM
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fromStart := time.Now()
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ctx, durRead, durVal, durOpt, err := readValidateAndOptimize(rs, conf, fromStart)
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if 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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fromWrite := time.Now()
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pages, err := PagesForPageSelection(ctx.PageCount, selectedPages, false)
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if err != nil {
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return err
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}
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// No special context processing required.
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// WriteContext decides which pages get written by checking conf.Cmd
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ctx.Write.SelectedPages = pages
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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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durWrite := time.Since(fromWrite).Seconds()
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durTotal := time.Since(fromStart).Seconds()
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logOperationStats(ctx, "trim, write", durRead, durVal, durOpt, durWrite, durTotal)
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return nil
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}
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// TrimFile generates a trimmed version of inFile
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// containing all selected pages and writes the result to outFile.
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func TrimFile(inFile, outFile string, selectedPages []string, conf *pdfcpu.Configuration) (err error) {
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var f1, f2 *os.File
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if f1, err = os.Open(inFile); err != nil {
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return err
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}
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tmpFile := inFile + ".tmp"
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if outFile != "" && inFile != outFile {
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tmpFile = outFile
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log.CLI.Printf("writing %s...\n", outFile)
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} else {
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log.CLI.Printf("writing %s...\n", inFile)
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}
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if f2, err = os.Create(tmpFile); err != nil {
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return err
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}
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defer func() {
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if err != nil {
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f2.Close()
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f1.Close()
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os.Remove(tmpFile)
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return
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}
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if err = f2.Close(); err != nil {
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return
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}
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if err = f1.Close(); err != nil {
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return
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}
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if outFile == "" || inFile == outFile {
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if err = os.Rename(tmpFile, inFile); err != nil {
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return
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}
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}
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}()
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return Trim(f1, f2, selectedPages, conf)
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}
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