com.johnsnowlabs.reader.util.pdf.PdfUtils.scala Maven / Gradle / Ivy

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/*
 * Copyright 2017-2025 John Snow Labs
 *
 * 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 com.johnsnowlabs.reader.util.pdf

trait PdfUtils {
  val MAX_CHARACTER_BEFORE_HEADER = 1000

  def checkAndFixPdf(content: Array[Byte]): Array[Byte] = {
    val pdfStartIndex = new String(
      content.slice(0, Math.min(MAX_CHARACTER_BEFORE_HEADER, content.length))).indexOf("%PDF")
    if (pdfStartIndex == -1) throw new RuntimeException("Pdf document is not valid")
    val validContent = content.slice(pdfStartIndex, content.length)
    validContent
  }

}