text: /**
   * Copyright (c) 2017 rxi
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the MIT license. See `microtar.c` for details.
   */
  
  #ifndef MICROTAR_H
  #define MICROTAR_H
  
  #include <stdio.h>
  #include <stdlib.h>
  
  #define MTAR_VERSION "0.1.0"
  
  enum {
    MTAR_ESUCCESS     =  0,
    MTAR_EFAILURE     = -1,
    MTAR_EOPENFAIL    = -2,
    MTAR_EREADFAIL    = -3,
    MTAR_EWRITEFAIL   = -4,
    MTAR_ESEEKFAIL    = -5,
    MTAR_EBADCHKSUM   = -6,
    MTAR_ENULLRECORD  = -7,
    MTAR_ENOTFOUND    = -8
  };
  
  enum {
    MTAR_TREG   = '0',
    MTAR_TLNK   = '1',
    MTAR_TSYM   = '2',
    MTAR_TCHR   = '3',
    MTAR_TBLK   = '4',
    MTAR_TDIR   = '5',
    MTAR_TFIFO  = '6'
  };
  
  typedef struct {
    unsigned mode;
    unsigned owner;
    unsigned size;
    unsigned mtime;
    unsigned type;
    char name[100];
    char linkname[100];
  } mtar_header_t;
  
  
  typedef struct mtar_t mtar_t;
  
  struct mtar_t {
    int (*read)(mtar_t *tar, void *data, unsigned size);
    int (*write)(mtar_t *tar, const void *data, unsigned size);
    int (*seek)(mtar_t *tar, unsigned pos);
    int (*close)(mtar_t *tar);
    void *stream;
    unsigned pos;
    unsigned size;  // support untar from memory
    unsigned remaining_data;
    unsigned last_header;
  };
  
  
  const char* mtar_strerror(int err);
  
  int mtar_open(mtar_t *tar, const char *filename, const char *mode);
  int mtar_open(mtar_t *tar, const char *tar_buf, unsigned int size);
  int mtar_close(mtar_t *tar);
  
  int mtar_seek(mtar_t *tar, unsigned pos);
  int mtar_rewind(mtar_t *tar);
  int mtar_next(mtar_t *tar);
  int mtar_find(mtar_t *tar, const char *name, mtar_header_t *h);
  int mtar_read_header(mtar_t *tar, mtar_header_t *h);
  int mtar_read_data(mtar_t *tar, void *ptr, unsigned size);
  
  int mtar_write_header(mtar_t *tar, const mtar_header_t *h);
  int mtar_write_file_header(mtar_t *tar, const char *name, unsigned size);
  int mtar_write_dir_header(mtar_t *tar, const char *name);
  int mtar_write_data(mtar_t *tar, const void *data, unsigned size);
  int mtar_finalize(mtar_t *tar);
  
  #endif
  