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importImage.go
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/
importImage.go
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/*
Copyright 2020 The pdfcpu Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package api
import (
"bufio"
"io"
"os"
"github.com/pdfcpu/pdfcpu/pkg/log"
"github.com/pdfcpu/pdfcpu/pkg/pdfcpu"
"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/model"
"github.com/pdfcpu/pdfcpu/pkg/pdfcpu/types"
)
// Import parses an Import command string into an internal structure.
func Import(s string, u types.DisplayUnit) (*pdfcpu.Import, error) {
return pdfcpu.ParseImportDetails(s, u)
}
// ImportImages appends PDF pages containing images to rs and writes the result to w.
// If rs == nil a new PDF file will be written to w.
func ImportImages(rs io.ReadSeeker, w io.Writer, imgs []io.Reader, imp *pdfcpu.Import, conf *model.Configuration) error {
if conf == nil {
conf = model.NewDefaultConfiguration()
}
conf.Cmd = model.IMPORTIMAGES
if imp == nil {
imp = pdfcpu.DefaultImportConfig()
}
var (
ctx *model.Context
err error
)
if rs != nil {
ctx, err = ReadAndValidate(rs, conf)
} else {
ctx, err = pdfcpu.CreateContextWithXRefTable(conf, imp.PageDim)
}
if err != nil {
return err
}
pagesIndRef, err := ctx.Pages()
if err != nil {
return err
}
// This is the page tree root.
pagesDict, err := ctx.DereferenceDict(*pagesIndRef)
if err != nil {
return err
}
for _, r := range imgs {
indRef, err := pdfcpu.NewPageForImage(ctx.XRefTable, r, pagesIndRef, imp)
if err != nil {
return err
}
if err := ctx.SetValid(*indRef); err != nil {
return err
}
if err = model.AppendPageTree(indRef, 1, pagesDict); err != nil {
return err
}
ctx.PageCount++
}
return Write(ctx, w, conf)
}
func fileExists(filename string) bool {
var ret bool
f, err := os.Open(filename)
if err == nil {
ret = true
}
defer f.Close()
return ret
}
func prepImgFiles(imgFiles []string, f1 *os.File) ([]io.ReadCloser, []io.Reader, error) {
rc := make([]io.ReadCloser, len(imgFiles))
rr := make([]io.Reader, len(imgFiles))
for i, fn := range imgFiles {
f, err := os.Open(fn)
if err != nil {
if f1 != nil {
f1.Close()
}
return nil, nil, err
}
rc[i] = f
rr[i] = bufio.NewReader(f)
}
return rc, rr, nil
}
func logImportImages(s, outFile string) {
if log.CLIEnabled() {
log.CLI.Printf("%s to %s...\n", s, outFile)
}
}
// ImportImagesFile appends PDF pages containing images to outFile which will be created if necessary.
func ImportImagesFile(imgFiles []string, outFile string, imp *pdfcpu.Import, conf *model.Configuration) (err error) {
var f1, f2 *os.File
rs := io.ReadSeeker(nil)
f1 = nil
tmpFile := outFile
if fileExists(outFile) {
if f1, err = os.Open(outFile); err != nil {
return err
}
rs = f1
tmpFile += ".tmp"
logImportImages("appending", outFile)
} else {
logImportImages("writing", outFile)
}
rc, rr, err := prepImgFiles(imgFiles, f1)
if err != nil {
return err
}
if f2, err = os.Create(tmpFile); err != nil {
if f1 != nil {
f1.Close()
}
return err
}
defer func() {
if err != nil {
f2.Close()
if f1 != nil {
f1.Close()
os.Remove(tmpFile)
}
for _, f := range rc {
f.Close()
}
return
}
if err = f2.Close(); err != nil {
return
}
if f1 != nil {
if err = f1.Close(); err != nil {
return
}
if err = os.Rename(tmpFile, outFile); err != nil {
return
}
}
for _, f := range rc {
if err := f.Close(); err != nil {
return
}
}
}()
return ImportImages(rs, f2, rr, imp, conf)
}