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[34.83.118.50]) by smtp.gmail.com with ESMTPSA id r2-20020a170903020200b0015e8d4eb29asm1371948plh.228.2022.05.13.02.53.17 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Fri, 13 May 2022 02:53:17 -0700 (PDT) From: softworkz X-Google-Original-From: softworkz Message-Id: <26c579e4ee0065a81f46b18adeba1b97385d8257.1652435595.git.ffmpegagent@gmail.com> In-Reply-To: References: Date: Fri, 13 May 2022 09:53:14 +0000 Fcc: Sent MIME-Version: 1.0 To: ffmpeg-devel@ffmpeg.org Subject: [FFmpeg-devel] [PATCH 1/2] avutil/wchar_filename, file_open: Support long file names on Windows X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Cc: softworkz Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: From: softworkz Signed-off-by: softworkz --- libavutil/file_open.c | 2 +- libavutil/wchar_filename.h | 123 +++++++++++++++++++++++++++++++++++++ 2 files changed, 124 insertions(+), 1 deletion(-) diff --git a/libavutil/file_open.c b/libavutil/file_open.c index cc302f2f76..57c5e78d51 100644 --- a/libavutil/file_open.c +++ b/libavutil/file_open.c @@ -45,7 +45,7 @@ static int win32_open(const char *filename_utf8, int oflag, int pmode) wchar_t *filename_w; /* convert UTF-8 to wide chars */ - if (utf8towchar(filename_utf8, &filename_w)) + if (get_extended_win32_path(filename_utf8, &filename_w)) return -1; if (!filename_w) goto fallback; diff --git a/libavutil/wchar_filename.h b/libavutil/wchar_filename.h index 90f082452c..94b4087de0 100644 --- a/libavutil/wchar_filename.h +++ b/libavutil/wchar_filename.h @@ -40,6 +40,129 @@ static inline int utf8towchar(const char *filename_utf8, wchar_t **filename_w) MultiByteToWideChar(CP_UTF8, 0, filename_utf8, -1, *filename_w, num_chars); return 0; } + +static inline int path_is_extended(const wchar_t *path) +{ + // see .NET6: PathInternal.IsExtended() + size_t len = wcslen(path); + if (len >= 4 && path[0] == L'\\' && (path[1] == L'\\' || path[1] == L'?') && path[2] == L'?' && path[3] == L'\\') + return 1; + + return 0; +} + +static inline int get_full_path_name(wchar_t **ppath_w) +{ + int num_chars; + wchar_t *temp_w; + + // see .NET6: PathHelper.GetFullPathName() + num_chars = GetFullPathNameW(*ppath_w, 0, NULL, NULL); + if (num_chars <= 0) { + errno = EINVAL; + return -1; + } + + temp_w = (wchar_t *)av_calloc(num_chars, sizeof(wchar_t)); + if (!temp_w) { + errno = ENOMEM; + return -1; + } + + num_chars = GetFullPathNameW(*ppath_w, num_chars, temp_w, NULL); + if (num_chars <= 0) { + errno = EINVAL; + return -1; + } + + av_freep(ppath_w); + *ppath_w = temp_w; + + return 0; +} + +static inline int path_normalize(wchar_t **ppath_w) +{ + int ret; + + // see .NET6: PathHelper.Normalize() + if ((ret = get_full_path_name(ppath_w)) < 0) + return ret; + + /* What .NET does at this point is to call PathHelper.TryExpandShortFileName() + in case the path contains a '~' character. + We don't need to do this as we don't need to normalize the file name + for presentation, and the extended path prefix works with 8.3 path + components as well */ + return 0; +} + +static inline int add_extended_prefix(wchar_t **ppath_w) +{ + const wchar_t *unc_prefix = L"\\\\?\\UNC\\"; + const wchar_t *extended_path_prefix = L"\\\\?\\"; + const wchar_t *path_w = *ppath_w; + const size_t len = wcslen(path_w); + wchar_t *temp_w; + + if (len < 2) + return 0; + + // see .NET6: PathInternal.EnsureExtendedPrefix() + if (path_w[0] == L'\\' && path_w[1] == L'\\') { + temp_w = (wchar_t *)av_calloc(len + 6 + 1, sizeof(wchar_t)); + if (!temp_w) { + errno = ENOMEM; + return -1; + } + wcscpy(temp_w, unc_prefix); + wcscat(temp_w, path_w + 2); + } else { + temp_w = (wchar_t *)av_calloc(len + 4 + 1, sizeof(wchar_t)); + if (!temp_w) { + errno = ENOMEM; + return -1; + } + wcscpy(temp_w, extended_path_prefix); + wcscat(temp_w, path_w); + } + + av_freep(ppath_w); + *ppath_w = temp_w; + + return 0; +} + +static inline int get_extended_win32_path(const char *path, wchar_t **ppath_w) +{ + int ret; + size_t len; + + // see .NET6: Path.GetFullPath() and Path.GetFullPathInternal() + if ((ret = utf8towchar(path, ppath_w)) < 0) + return ret; + + if (path_is_extended(*ppath_w)) { + /* \\?\ paths are considered normalized by definition. Windows doesn't normalize \\?\ + paths and neither should we. Even if we wanted to, GetFullPathName does not work + properly with device paths. If one wants to pass a \\?\ path through normalization + one can chop off the prefix, pass it to GetFullPath and add it again. */ + return 0; + } + + if ((ret = path_normalize(ppath_w)) < 0) + return ret; + + // see .NET6: PathInternal.EnsureExtendedPrefixIfNeeded() + len = wcslen(*ppath_w); + if (len >= 260 || (*ppath_w)[len - 1] == L' ' || (*ppath_w)[len - 1] == L'.') { + if ((ret = add_extended_prefix(ppath_w)) < 0) + return ret; + } + + return 0; +} + #endif #endif /* AVUTIL_WCHAR_FILENAME_H */ -- ffmpeg-codebot _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".