/* nsJARInputStream.h
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsJARINPUTSTREAM_h__
#define nsJARINPUTSTREAM_h__

#include "nsIInputStream.h"
#include "nsJAR.h"
#include "nsTArray.h"
#include "mozilla/Attributes.h"

/*-------------------------------------------------------------------------
 * Class nsJARInputStream declaration. This class defines the type of the
 * object returned by calls to nsJAR::GetInputStream(filename) for the
 * purpose of reading a file item out of a JAR file.
 *------------------------------------------------------------------------*/
class nsJARInputStream final : public nsIInputStream {
 public:
  nsJARInputStream()
      : mOutSize(0),
        mInCrc(0),
        mOutCrc(0),
        mNameLen(0),
        mCurPos(0),
        mArrPos(0),
        mMode(MODE_NOTINITED) {
    memset(&mZs, 0, sizeof(z_stream));
  }

  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIINPUTSTREAM

  // takes ownership of |fd|, even on failure
  nsresult InitFile(nsZipHandle* aFd, const uint8_t* aData, nsZipItem* item);

  nsresult InitDirectory(nsJAR* aJar, const nsACString& aJarDirSpec,
                         const char* aDir);

 private:
  ~nsJARInputStream() { Close(); }

  RefPtr<nsZipHandle> mFd;  // handle for reading
  uint32_t mOutSize;        // inflated size
  uint32_t mInCrc;          // CRC as provided by the zipentry
  uint32_t mOutCrc;         // CRC as calculated by me
  z_stream mZs;             // zip data structure

  /* For directory reading */
  RefPtr<nsJAR> mJar;          // string reference to zipreader
  uint32_t mNameLen;           // length of dirname
  nsCString mBuffer;           // storage for generated text of stream
  uint32_t mCurPos;            // Current position in buffer
  uint32_t mArrPos;            // current position within mArray
  nsTArray<nsCString> mArray;  // array of names in (zip) directory

  typedef enum {
    MODE_NOTINITED,
    MODE_CLOSED,
    MODE_DIRECTORY,
    MODE_INFLATE,
    MODE_COPY
  } JISMode;

  JISMode mMode;  // Modus of the stream

  nsresult ContinueInflate(char* aBuf, uint32_t aCount, uint32_t* aBytesRead);
  nsresult ReadDirectory(char* aBuf, uint32_t aCount, uint32_t* aBytesRead);
  uint32_t CopyDataToBuffer(char*& aBuffer, uint32_t& aCount);
};

#endif /* nsJARINPUTSTREAM_h__ */
