extract: corrupted page tree

[rocksun]

• CentOS Stream 8

The code is:

import (
	"fmt"

	pdfcpu "github.com/pdfcpu/pdfcpu/pkg/api"
)

func main() {
	err := pdfcpu.ExtractImagesFile("../testfiles/source.pdf", "../testfiles/images", []string{"1", "2"}, nil)
	fmt.Println(err)
}

Here is the pdf: removed.pdf

The go.mod is:

module github.com/rocksun/ocrtest

go 1.18

require (
	github.com/pdfcpu/pdfcpu v0.3.13
)

And the output is:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x5eb7c9]

goroutine 1 [running]:
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.(*Image).Read(0x10?, {0xc004622000?, 0xc006236790?, 0xabcce0?})
        <autogenerated>:1 +0x29
io.copyBuffer({0x887020, 0xc006236790}, {0x886a20, 0xc00024a900}, {0x0, 0x0, 0x0})
        /usr/lib/golang/src/io/io.go:426 +0x1b2
io.Copy(...)
        /usr/lib/golang/src/io/io.go:385
os.genericReadFrom(0xc00624f928?, {0x886a20, 0xc00024a900})
        /usr/lib/golang/src/os/file.go:162 +0x67
os.(*File).ReadFrom(0xc000010690, {0x886a20, 0xc00024a900})
        /usr/lib/golang/src/os/file.go:156 +0x1b0
io.copyBuffer({0x8864c0, 0xc000010690}, {0x886a20, 0xc00024a900}, {0x0, 0x0, 0x0})
        /usr/lib/golang/src/io/io.go:412 +0x14b
io.Copy(...)
        /usr/lib/golang/src/io/io.go:385
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.WriteReader({0xc00001a600?, 0x21?}, {0x886a20, 0xc00024a900})
        /home/vagrant/go/pkg/mod/github.com/pdfcpu/pdfcpu@v0.3.12/pkg/pdfcpu/writeImage.go:820 +0x65
github.com/pdfcpu/pdfcpu/pkg/pdfcpu.WriteImageToDisk.func1({{0x0, 0x0}, {0xc000369c0d, 0x3}, {0x0, 0x0}, 0x2, 0x19, 0x0, 0x0, ...}, ...)
        /home/vagrant/go/pkg/mod/github.com/pdfcpu/pdfcpu@v0.3.12/pkg/pdfcpu/images.go:166 +0x4a9
github.com/pdfcpu/pdfcpu/pkg/api.ExtractImages({0x887c68, 0xc0000105d0}, {0xc000519f50, 0x2, 0x2}, 0xc000077f20, 0xc0000406b0?)
        /home/vagrant/go/pkg/mod/github.com/pdfcpu/pdfcpu@v0.3.12/pkg/api/extract.go:121 +0x44c
github.com/pdfcpu/pdfcpu/pkg/api.ExtractImagesFile({0x7eafea, 0x17}, {0x7e8d62, 0x13}, {0xc000109f50, 0x2, 0x2}, 0x40bfb9?)
        /home/vagrant/go/pkg/mod/github.com/pdfcpu/pdfcpu@v0.3.12/pkg/api/extract.go:139 +0x249
main.main()
        /vagrant/data/ocrtest/extractpdf/extractimages/extractimages.go:10 +0x7c
exit status 2

[hhrutter]

I can't comment about the trace you are getting but I noticed that your file contains empty pagesDicts which were not handled correctly.

This is fixed with latest commit.