()
| 142 | } |
| 143 | |
| 144 | func (r *pdfReader) readCrossReferenceStream() (pdfDict, error) { |
| 145 | istream, err := r.readObjectAt(noEncryptRef, r.startxref) |
| 146 | if err != nil { |
| 147 | return pdfDict{}, fmt.Errorf("invalid cross reference stream: %w", err) |
| 148 | } |
| 149 | stream, ok := istream.(pdfStream) |
| 150 | if !ok { |
| 151 | return pdfDict{}, fmt.Errorf("invalid cross reference stream") |
| 152 | } |
| 153 | size, err := r.GetInt(stream.dict["Size"]) |
| 154 | if err != nil { |
| 155 | return pdfDict{}, fmt.Errorf("invalid cross reference stream") |
| 156 | } |
| 157 | ws, err := r.GetArray(stream.dict["W"]) |
| 158 | if err != nil || len(ws) != 3 { |
| 159 | return pdfDict{}, fmt.Errorf("invalid cross reference stream") |
| 160 | } |
| 161 | W := [3]int{} |
| 162 | for i, w := range ws { |
| 163 | W[i], err = r.GetInt(w) |
| 164 | if err != nil || 4 < W[i] { |
| 165 | return pdfDict{}, fmt.Errorf("invalid cross reference stream") |
| 166 | } |
| 167 | } |
| 168 | indices := make([]int, size) |
| 169 | if _, ok := stream.dict["Index"]; ok { |
| 170 | is, err := r.GetArray(stream.dict["Index"]) |
| 171 | if err != nil { |
| 172 | return pdfDict{}, fmt.Errorf("invalid cross reference stream") |
| 173 | } |
| 174 | d := 0 |
| 175 | for i := 0; i < len(is); i += 2 { |
| 176 | first, err1 := r.GetInt(is[i+0]) |
| 177 | n, err2 := r.GetInt(is[i+1]) |
| 178 | if err1 != nil || err2 != nil { |
| 179 | return pdfDict{}, fmt.Errorf("invalid cross reference stream") |
| 180 | } |
| 181 | for j := 0; j < n; j++ { |
| 182 | indices[d+j] = first + j |
| 183 | } |
| 184 | d += n |
| 185 | } |
| 186 | indices = indices[:d] |
| 187 | } else { |
| 188 | for i := 0; i < size; i++ { |
| 189 | indices[i] = i |
| 190 | } |
| 191 | } |
| 192 | dW := W[0] + W[1] + W[2] |
| 193 | if len(stream.data) != dW*size || W[1] == 0 { |
| 194 | return pdfDict{}, fmt.Errorf("invalid cross reference stream") |
| 195 | } |
| 196 | for i := 0; i < size; i++ { |
| 197 | if len(indices) <= i { |
| 198 | break |
| 199 | } |
| 200 | |
| 201 | d := i * dW |
no test coverage detected