fix bugs

Author: PavelSafronov

src/cmap/commands.ts

@@ -791,7 +791,7 @@ export class OpCompressedRequest {
     const compressionDetails = ByteUtils.allocate(COMPRESSION_DETAILS_SIZE);
     writeInt32LE(compressionDetails, originalCommandOpCode, 0); // originalOpcode
     writeInt32LE(compressionDetails, messageToBeCompressed.length, 4); // Size of the uncompressed compressedMessage, excluding the MsgHeader
-    writeInt32LE(compressionDetails, Compressor[this.options.agreedCompressor], 8); // compressorID
+    compressionDetails[8] = Compressor[this.options.agreedCompressor]; // compressorID
     return [msgHeader, compressionDetails, compressedMessage];
   }
 }

src/gridfs/upload.ts

@@ -438,7 +438,7 @@ function doWrite(
   let outstandingRequests = 0;
   while (inputBufRemaining > 0) {
     const inputBufPos = inputBuf.length - inputBufRemaining;
-    ByteUtils.copy(inputBuf, stream.bufToStore, stream.pos, inputBufPos, +numToCopy);
+    ByteUtils.copy(inputBuf, stream.bufToStore, stream.pos, inputBufPos, inputBufPos + numToCopy);
     stream.pos += numToCopy;
     spaceRemaining -= numToCopy;
     let doc: GridFSChunk;