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file_fdf.go
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file_fdf.go
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package file
import (
"fmt"
"io"
"os"
"github.com/benoitkugler/pdf/model"
"github.com/benoitkugler/pdf/reader/parser"
)
// FDFFile is an in-memory version of a .fdf file,
// used to fill PDF forms.
type FDFFile struct {
XrefTable
Version string
Root model.ObjIndirectRef
}
// ReadFDFFile is the same as ReadFDF, but takes a file name as input.
func ReadFDFFile(file string) (FDFFile, error) {
f, err := os.Open(file)
if err != nil {
return FDFFile{}, err
}
defer f.Close()
return ReadFDF(f)
}
// ReadFDF process a FDF file, loading objects in memory.
func ReadFDF(rs io.ReadSeeker) (FDFFile, error) {
return processFDFFile(rs)
}
func processFDFFile(rs io.ReadSeeker) (FDFFile, error) {
version, err := headerVersion(rs, "%FDF-")
if err != nil {
return FDFFile{}, err
}
ctx, err := newContext(rs, nil)
if err != nil {
return FDFFile{}, err
}
buf, err := ctx.findStringFromFileEnd(0, "trailer")
if err != nil {
return FDFFile{}, err
}
trailer, err := parser.ParseObject(buf)
if err != nil {
return FDFFile{}, err
}
trailerDict, ok := trailer.(model.ObjDict)
if !ok {
return FDFFile{}, fmt.Errorf("unexpected type for trailer: %T", trailer)
}
root, ok := trailerDict["Root"].(parser.IndirectRef)
if !ok {
return FDFFile{}, fmt.Errorf("unexpected type for Root entry: %T", trailerDict["Root"])
}
// since FDF files may not have xref section, we simply read the file
// line by line
err = ctx.bypassXrefSection()
if err != nil {
return FDFFile{}, err
}
err = ctx.processAllObjects()
if err != nil {
return FDFFile{}, err
}
out := FDFFile{Version: version, Root: root, XrefTable: make(XrefTable)}
for k, v := range ctx.xrefTable.objects {
if v.free {
continue
}
out.XrefTable[k.ObjectNumber] = v.object
}
return out, nil
}