Add spellcheck and word suggestion to the prediction service

third_party/android_prediction/suggest/policyimpl/dictionary/utils/file_utils.cpp

Index: third_party/android_prediction/suggest/policyimpl/dictionary/utils/file_utils.cpp
diff --git a/third_party/android_prediction/suggest/policyimpl/dictionary/utils/file_utils.cpp b/third_party/android_prediction/suggest/policyimpl/dictionary/utils/file_utils.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9622ec6f450c3da9e90278893da52dd27093715f
--- /dev/null
+++ b/third_party/android_prediction/suggest/policyimpl/dictionary/utils/file_utils.cpp
@@ -0,0 +1,171 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "third_party/android_prediction/suggest/policyimpl/dictionary/utils/file_utils.h"
+
+#include <cstdio>
+#include <cstring>
+#include <dirent.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+namespace latinime {
+
+// Returns -1 on error.
+/* static */ int FileUtils::getFileSize(const char *const filePath) {
+    const int fd = open(filePath, O_RDONLY);
+    if (fd == -1) {
+        return -1;
+    }
+    struct stat statBuf;
+    if (fstat(fd, &statBuf) != 0) {
+        close(fd);
+        return -1;
+    }
+    close(fd);
+    return static_cast<int>(statBuf.st_size);
+}
+
+/* static */ bool FileUtils::existsDir(const char *const dirPath) {
+    DIR *const dir = opendir(dirPath);
+    if (dir == NULL) {
+        return false;
+    }
+    closedir(dir);
+    return true;
+}
+
+// Remove a directory and all files in the directory.
+/* static */ bool FileUtils::removeDirAndFiles(const char *const dirPath) {
+    return removeDirAndFiles(dirPath, 5 /* maxTries */);
+}
+
+// Remove a directory and all files in the directory, trying up to maxTimes.
+/* static */ bool FileUtils::removeDirAndFiles(const char *const dirPath, const int maxTries) {
+    DIR *const dir = opendir(dirPath);
+    if (dir == NULL) {
+        AKLOGE("Cannot open dir %s.", dirPath);
+        return true;
+    }
+    struct dirent *dirent;
+    while ((dirent = readdir(dir)) != NULL) {
+        if (dirent->d_type == DT_DIR) {
+            continue;
+        }
+        if (strcmp(dirent->d_name, ".") == 0 || strcmp(dirent->d_name, "..") == 0) {
+            continue;
+        }
+        const int filePathBufSize = getFilePathBufSize(dirPath, dirent->d_name);
+        char filePath[filePathBufSize];
+        getFilePath(dirPath, dirent->d_name, filePathBufSize, filePath);
+        if (remove(filePath) != 0) {
+            AKLOGE("Cannot remove file %s.", filePath);
+            closedir(dir);
+            return false;
+        }
+    }
+    closedir(dir);
+    if (remove(dirPath) != 0) {
+        if (maxTries > 0) {
+            // On NFS, deleting files sometimes creates new files. I'm not sure what the
+            // correct way of dealing with this is, but for the time being, this seems to work.
+            removeDirAndFiles(dirPath, maxTries - 1);
+        } else {
+            AKLOGE("Cannot remove directory %s.", dirPath);
+            return false;
+        }
+    }
+    return true;
+}
+
+/* static */ int FileUtils::getFilePathWithSuffixBufSize(const char *const filePath,
+        const char *const suffix) {
+    return strlen(filePath) + strlen(suffix) + 1 /* terminator */;
+}
+
+/* static */ void FileUtils::getFilePathWithSuffix(const char *const filePath,
+        const char *const suffix, const int filePathBufSize, char *const outFilePath) {
+    snprintf(outFilePath, filePathBufSize, "%s%s", filePath, suffix);
+}
+
+/* static */ int FileUtils::getFilePathBufSize(const char *const dirPath,
+        const char *const fileName) {
+    return strlen(dirPath) + 1 /* '/' */ + strlen(fileName) + 1 /* terminator */;
+}
+
+/* static */ void FileUtils::getFilePath(const char *const dirPath, const char *const fileName,
+        const int filePathBufSize, char *const outFilePath) {
+    snprintf(outFilePath, filePathBufSize, "%s/%s", dirPath, fileName);
+}
+
+/* static */ bool FileUtils::getFilePathWithoutSuffix(const char *const filePath,
+        const char *const suffix, const int outDirPathBufSize, char *const outDirPath) {
+    const int filePathLength = strlen(filePath);
+    const int suffixLength = strlen(suffix);
+    if (filePathLength <= suffixLength) {
+        AKLOGE("File path length (%s:%d) is shorter that suffix length (%s:%d).",
+                filePath, filePathLength, suffix, suffixLength);
+        return false;
+    }
+    const int resultFilePathLength = filePathLength - suffixLength;
+    if (outDirPathBufSize <= resultFilePathLength) {
+        AKLOGE("outDirPathBufSize is too small. filePath: %s, suffix: %s, outDirPathBufSize: %d",
+                filePath, suffix, outDirPathBufSize);
+        return false;
+    }
+    if (strncmp(filePath + resultFilePathLength, suffix, suffixLength) != 0) {
+        AKLOGE("File Path %s does not have %s as a suffix", filePath, suffix);
+        return false;
+    }
+    snprintf(outDirPath, resultFilePathLength + 1 /* terminator */, "%s", filePath);
+    return true;
+}
+
+/* static */ void FileUtils::getDirPath(const char *const filePath, const int outDirPathBufSize,
+        char *const outDirPath) {
+    for (int i = strlen(filePath) - 1; i >= 0; --i) {
+        if (filePath[i] == '/') {
+            if (i >= outDirPathBufSize) {
+                AKLOGE("outDirPathBufSize is too small. filePath: %s, outDirPathBufSize: %d",
+                        filePath, outDirPathBufSize);
+                ASSERT(false);
+                return;
+            }
+            snprintf(outDirPath, i + 1 /* terminator */, "%s", filePath);
+            return;
+        }
+    }
+}
+
+/* static */ void FileUtils::getBasename(const char *const filePath,
+        const int outNameBufSize, char *const outName) {
+    const int filePathBufSize = strlen(filePath) + 1 /* terminator */;
+    char filePathBuf[filePathBufSize];
+    snprintf(filePathBuf, filePathBufSize, "%s", filePath);
+    const char *const baseName = basename(filePathBuf);
+    const int baseNameLength = strlen(baseName);
+    if (baseNameLength >= outNameBufSize) {
+        AKLOGE("outNameBufSize is too small. filePath: %s, outNameBufSize: %d",
+                filePath, outNameBufSize);
+        return;
+    }
+    snprintf(outName, baseNameLength + 1 /* terminator */, "%s", baseName);
+}
+
+} // namespace latinime