PropertiesAdd adn PropertiesRemove does not handle missing info dict

[suwro]

Hi,
pdfcpu v0.3.13
I have some scanned pdf on which PropertiesList.Info is nil. I can't add title or property it trows error

goroutine 1 [running]: github.com/pdfcpu/pdfcpu/pkg/pdfcpu.PropertiesAdd(0xc000148b60, 0xc000141e30?)

in properties.go line 44 and 61 there's a TODO handle missing empty dict
can you please add this feature

thank you

here's my code - is working if Info is not nil

date, err := ioutil.ReadFile(inPdf)
ckErr(err)

ctx, err := api.ReadContext(io.ReadSeeker(bytes.NewReader(date)), pdfcpu.NewDefaultConfiguration())
ckErr(err)

pdfcpu.PropertiesRemove(ctx.XRefTable, []string{"Title", "Autor"})
properties := map[string]string{"Title": "modified ok"}
pdfcpu.PropertiesAdd(ctx.XRefTable, properties)

var b bytes.Buffer
w := bufio.NewWriter(&b)

err = api.WriteContext(ctx, w)
ckErr(err)

err = ioutil.WriteFile("prop_mod.pdf", b.Bytes(), 0644)
ckErr(err)

[hhrutter]

Thanks!

I'll check it out.

[suwro]

Hello, any news about this?
can't we just link an empty Dict and return it ?

[suwro]

Done, i've slove it by adding new IndirectRef before propertiesAdd and eliminated PropertiesRemove

date, err := ioutil.ReadFile(inPdf)
ckErr(err)

ctx, err := api.ReadContext(io.ReadSeeker(bytes.NewReader(date)), pdfcpu.NewDefaultConfiguration())
ckErr(err)

// ADD NEW EMPTY INFO IF NIL
if ctx.XRefTable.Info == nil {
    ctx.XRefTable.Info = pdfcpu.NewIndirectRef(1, 0)
}

properties := map[string]string{"Title": "modified ok"}
pdfcpu.PropertiesAdd(ctx.XRefTable, properties)

var b bytes.Buffer
w := bufio.NewWriter(&b)

err = api.WriteContext(ctx, w)
ckErr(err)

err = ioutil.WriteFile("hello.pdf", b.Bytes(), 0644)
ckErr(err)

can you please modify properties.go line 44 (PropertiesAdd) with this:

if xRefTable.Info == nil {
    xRefTable.Info = NewIndirectRef(1, 0)
}

If PropertiesRemove is nil just return - do nothing since there's nothing to remove (properties.go line 61)

[hhrutter]

This is fixed with the latest commit.