Add the possibility to create a pdf from different ones (bug 1997379)

src/core/decode_stream.js

@@ -131,6 +131,19 @@ class DecodeStream extends BaseStream {
   getBaseStreams() {
     return this.stream ? this.stream.getBaseStreams() : null;
   }
+
+  clone() {
+    // Make sure it has been fully read.
+    while (!this.eof) {
+      this.readBlock();
+    }
+    return new Stream(
+      this.buffer,
+      this.start,
+      this.end - this.start,
+      this.dict.clone()
+    );
+  }
 }
 
 class StreamsSequenceStream extends DecodeStream {

src/core/decrypt_stream.js

@@ -52,6 +52,10 @@ class DecryptStream extends DecodeStream {
     buffer.set(chunk, bufferLength);
     this.bufferLength = newLength;
   }
+
+  getOriginalStream() {
+    return this;
+  }
 }
 
 export { DecryptStream };

src/core/document.js

@@ -178,7 +178,7 @@ class Page {
     );
   }
 
-  #getBoundingBox(name) {
+  getBoundingBox(name) {
     if (this.xfaData) {
       return this.xfaData.bbox;
     }
@@ -201,7 +201,7 @@ class Page {
     return shadow(
       this,
       "mediaBox",
-      this.#getBoundingBox("MediaBox") || LETTER_SIZE_MEDIABOX
+      this.getBoundingBox("MediaBox") || LETTER_SIZE_MEDIABOX
     );
   }
 
@@ -210,7 +210,7 @@ class Page {
     return shadow(
       this,
       "cropBox",
-      this.#getBoundingBox("CropBox") || this.mediaBox
+      this.getBoundingBox("CropBox") || this.mediaBox
     );
   }