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/thirdparty/breakpad/client/linux/minidump_writer/directory_reader.h

http://github.com/tomahawk-player/tomahawk
C++ Header | 105 lines | 51 code | 16 blank | 38 comment | 11 complexity | f9369aa74ca2b1e2eaa9f4eda4ee1db0 MD5 | raw file
  1// Copyright (c) 2009, Google Inc.
  2// All rights reserved.
  3//
  4// Redistribution and use in source and binary forms, with or without
  5// modification, are permitted provided that the following conditions are
  6// met:
  7//
  8//     * Redistributions of source code must retain the above copyright
  9// notice, this list of conditions and the following disclaimer.
 10//     * Redistributions in binary form must reproduce the above
 11// copyright notice, this list of conditions and the following disclaimer
 12// in the documentation and/or other materials provided with the
 13// distribution.
 14//     * Neither the name of Google Inc. nor the names of its
 15// contributors may be used to endorse or promote products derived from
 16// this software without specific prior written permission.
 17//
 18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 25// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 26// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 27// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 29
 30#ifndef CLIENT_LINUX_MINIDUMP_WRITER_DIRECTORY_READER_H_
 31#define CLIENT_LINUX_MINIDUMP_WRITER_DIRECTORY_READER_H_
 32
 33#include <stdint.h>
 34#include <unistd.h>
 35#include <limits.h>
 36#include <assert.h>
 37#include <errno.h>
 38#include <string.h>
 39
 40#include "third_party/lss/linux_syscall_support.h"
 41
 42namespace google_breakpad {
 43
 44// A class for enumerating a directory without using diropen/readdir or other
 45// functions which may allocate memory.
 46class DirectoryReader {
 47 public:
 48  DirectoryReader(int fd)
 49      : fd_(fd),
 50        buf_used_(0) {
 51  }
 52
 53  // Return the next entry from the directory
 54  //   name: (output) the NUL terminated entry name
 55  //
 56  // Returns true iff successful (false on EOF).
 57  //
 58  // After calling this, one must call |PopEntry| otherwise you'll get the same
 59  // entry over and over.
 60  bool GetNextEntry(const char** name) {
 61    struct kernel_dirent* const dent =
 62      reinterpret_cast<kernel_dirent*>(buf_);
 63
 64    if (buf_used_ == 0) {
 65      // need to read more entries.
 66      const int n = sys_getdents(fd_, dent, sizeof(buf_));
 67      if (n < 0) {
 68        return false;
 69      } else if (n == 0) {
 70        hit_eof_ = true;
 71      } else {
 72        buf_used_ += n;
 73      }
 74    }
 75
 76    if (buf_used_ == 0 && hit_eof_)
 77      return false;
 78
 79    assert(buf_used_ > 0);
 80
 81    *name = dent->d_name;
 82    return true;
 83  }
 84
 85  void PopEntry() {
 86    if (!buf_used_)
 87      return;
 88
 89    const struct kernel_dirent* const dent =
 90      reinterpret_cast<kernel_dirent*>(buf_);
 91
 92    buf_used_ -= dent->d_reclen;
 93    memmove(buf_, buf_ + dent->d_reclen, buf_used_);
 94  }
 95
 96 private:
 97  const int fd_;
 98  bool hit_eof_;
 99  unsigned buf_used_;
100  uint8_t buf_[sizeof(struct kernel_dirent) + NAME_MAX + 1];
101};
102
103}  // namespace google_breakpad
104
105#endif  // CLIENT_LINUX_MINIDUMP_WRITER_DIRECTORY_READER_H_