| // Copyright (c) 2009, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef CLIENT_LINUX_MINIDUMP_WRITER_DIRECTORY_READER_H_ |
| #define CLIENT_LINUX_MINIDUMP_WRITER_DIRECTORY_READER_H_ |
| |
| #include <stdint.h> |
| #include <unistd.h> |
| #include <limits.h> |
| #include <assert.h> |
| #include <errno.h> |
| #include <string.h> |
| |
| #include "third_party/lss/linux_syscall_support.h" |
| |
| namespace google_breakpad { |
| |
| // A class for enumerating a directory without using diropen/readdir or other |
| // functions which may allocate memory. |
| class DirectoryReader { |
| public: |
| DirectoryReader(int fd) |
| : fd_(fd), |
| buf_used_(0) { |
| } |
| |
| // Return the next entry from the directory |
| // name: (output) the NUL terminated entry name |
| // |
| // Returns true iff successful (false on EOF). |
| // |
| // After calling this, one must call |PopEntry| otherwise you'll get the same |
| // entry over and over. |
| bool GetNextEntry(const char** name) { |
| struct kernel_dirent* const dent = |
| reinterpret_cast<kernel_dirent*>(buf_); |
| |
| if (buf_used_ == 0) { |
| // need to read more entries. |
| const int n = sys_getdents(fd_, dent, sizeof(buf_)); |
| if (n < 0) { |
| return false; |
| } else if (n == 0) { |
| hit_eof_ = true; |
| } else { |
| buf_used_ += n; |
| } |
| } |
| |
| if (buf_used_ == 0 && hit_eof_) |
| return false; |
| |
| assert(buf_used_ > 0); |
| |
| *name = dent->d_name; |
| return true; |
| } |
| |
| void PopEntry() { |
| if (!buf_used_) |
| return; |
| |
| const struct kernel_dirent* const dent = |
| reinterpret_cast<kernel_dirent*>(buf_); |
| |
| buf_used_ -= dent->d_reclen; |
| memmove(buf_, buf_ + dent->d_reclen, buf_used_); |
| } |
| |
| private: |
| const int fd_; |
| bool hit_eof_; |
| unsigned buf_used_; |
| uint8_t buf_[sizeof(struct kernel_dirent) + NAME_MAX + 1]; |
| }; |
| |
| } // namespace google_breakpad |
| |
| #endif // CLIENT_LINUX_MINIDUMP_WRITER_DIRECTORY_READER_H_ |