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| author | Jay Berkenbilt <ejb@ql.org> | 2017-07-30 02:19:54 +0200 |
|---|---|---|
| committer | Jay Berkenbilt <ejb@ql.org> | 2017-07-30 02:58:01 +0200 |
| commit | 5993c3e83c6f83b36045c75a03ffb1da3d1d283c (patch) | |
| tree | 8854661becc586fff8ba07a99d616153f508d43a /libqpdf/QUtil.cc | |
| parent | 885b8781cccdc9d4402af58176e826a354b5ef7a (diff) | |
| download | qpdf-5993c3e83c6f83b36045c75a03ffb1da3d1d283c.tar.zst | |
Detect input file = output file (fixes #29)
Diffstat (limited to 'libqpdf/QUtil.cc')
| -rw-r--r-- | libqpdf/QUtil.cc | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/libqpdf/QUtil.cc b/libqpdf/QUtil.cc index 86de07f2..eed8d276 100644 --- a/libqpdf/QUtil.cc +++ b/libqpdf/QUtil.cc @@ -24,6 +24,7 @@ #include <io.h> #else #include <unistd.h> +#include <sys/stat.h> #endif std::string @@ -188,6 +189,55 @@ QUtil::tell(FILE* stream) #endif } +bool +QUtil::same_file(char const* name1, char const* name2) +{ + if ((name1 == 0) || (strlen(name1) == 0) || + (name2 == 0) || (strlen(name2) == 0)) + { + return false; + } +#ifdef _WIN32 + HANDLE fh1 = CreateFile(name1, GENERIC_READ, FILE_SHARE_READ, + NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); + HANDLE fh2 = CreateFile(name2, GENERIC_READ, FILE_SHARE_READ, + NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); + BY_HANDLE_FILE_INFORMATION fi1; + BY_HANDLE_FILE_INFORMATION fi2; + bool same = false; + if ((fh1 != INVALID_HANDLE_VALUE) && + (fh2 != INVALID_HANDLE_VALUE) && + GetFileInformationByHandle(fh1, &fi1) && + GetFileInformationByHandle(fh2, &fi2) && + (fi1.dwVolumeSerialNumber == fi2.dwVolumeSerialNumber) && + (fi1.nFileIndexLow == fi2.nFileIndexLow) && + (fi1.nFileIndexHigh == fi2.nFileIndexHigh)) + { + same = true; + } + if (fh1 != INVALID_HANDLE_VALUE) + { + CloseHandle(fh1); + } + if (fh2 != INVALID_HANDLE_VALUE) + { + CloseHandle(fh2); + } + return same; +#else + struct stat st1; + struct stat st2; + if ((stat(name1, &st1) == 0) && + (stat(name2, &st2) == 0) && + (st1.st_ino == st2.st_ino) && + (st1.st_dev == st2.st_dev)) + { + return true; + } +#endif + return false; +} + char* QUtil::copy_string(std::string const& str) { |