xattr.h

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#ifndef CVMFS_XATTR_H_
#define CVMFS_XATTR_H_

#include <inttypes.h>

#include <map>
#include <string>
#include <vector>

class XattrList {
 public:
  static const uint8_t kVersion;

  XattrList() : version_(kVersion) { }
  static XattrList *CreateFromFile(const std::string &path);

  std::vector<std::string> ListKeys() const;
  std::string ListKeysPosix(const std::string &merge_with) const;
  bool Has(const std::string &key) const;
  bool Get(const std::string &key, std::string *value) const;
  bool Set(const std::string &key, const std::string &value);
  bool Remove(const std::string &key);
  bool IsEmpty() const { return xattrs_.empty(); }
  void Clear() { xattrs_.clear(); }

  void Serialize(unsigned char **outbuf, unsigned *size,
                 const std::vector<std::string> *blacklist = NULL) const;
  static XattrList *Deserialize(const unsigned char *inbuf,
                                const unsigned size);

  uint8_t version() { return version_; }

 private:
  struct XattrHeader {
    XattrHeader() : version(kVersion), num_xattrs(0) { }
    explicit XattrHeader(const uint8_t num_xattrs)
        : version(kVersion), num_xattrs(num_xattrs) { }
    uint8_t version;
    uint8_t num_xattrs;
  };
  struct XattrEntry {
    XattrEntry(const std::string &key, const std::string &value);
    XattrEntry() : len_key(0), len_value(0) { }
    uint16_t GetSize() const;
    std::string GetKey() const;
    std::string GetValue() const;
    uint8_t len_key;
    uint8_t len_value;
    // Concatenate the key the value.  When written out or read in, data is cut
    // off at len_key+len_value
    char data[512];
  };

  uint8_t version_;
  std::map<std::string, std::string> xattrs_;
};

#endif  // CVMFS_XATTR_H_