Fix WebSQL error on sandboxed OSX and Linux.

Source/modules/webdatabase/sqlite/SQLiteFileSystemPosix.cpp

Index: Source/modules/webdatabase/sqlite/SQLiteFileSystemPosix.cpp
diff --git a/Source/modules/webdatabase/sqlite/SQLiteFileSystemPosix.cpp b/Source/modules/webdatabase/sqlite/SQLiteFileSystemPosix.cpp
index e2e57aa633ea53237bb23b54aa3cf075db159c15..3a96c0e959ccdd904ef60432d1e04b90e051a31e 100644
--- a/Source/modules/webdatabase/sqlite/SQLiteFileSystemPosix.cpp
+++ b/Source/modules/webdatabase/sqlite/SQLiteFileSystemPosix.cpp
@@ -52,6 +52,93 @@ namespace blink {
 // Chromium's Posix implementation of SQLite VFS
 namespace {
 
+struct chromiumVfsFile {
+    sqlite3_io_methods* pMethods;
+    sqlite3_file* wrappedFile;
+    char* wrappedFileName;
+};
+
+int chromiumClose(sqlite3_file* sqliteFile)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    int r = chromiumFile->wrappedFile->pMethods->xClose(chromiumFile->wrappedFile);
+    sqlite3_free(chromiumFile->wrappedFileName);
+    sqlite3_free(chromiumFile->wrappedFile);
+    memset(chromiumFile, 0, sizeof(*chromiumFile));
+    return r;
+}
+
+int chromiumRead(sqlite3_file* sqliteFile, void* pBuf, int iAmt, sqlite3_int64 iOfst)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xRead(chromiumFile->wrappedFile, pBuf, iAmt, iOfst);
+}
+
+int chromiumWrite(sqlite3_file* sqliteFile, const void* pBuf, int iAmt, sqlite3_int64 iOfst)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xWrite(chromiumFile->wrappedFile, pBuf, iAmt, iOfst);
+}
+
+int chromiumTruncate(sqlite3_file* sqliteFile, sqlite3_int64 size)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+
+    // The OSX and Linux sandboxes block ftruncate(), proxy to the browser
+    // process.
+    if (Platform::current()->databaseSetFileSize(String(chromiumFile->wrappedFileName), size))
+        return SQLITE_OK;
+    return SQLITE_IOERR_TRUNCATE;
+}
+
+int chromiumSync(sqlite3_file* sqliteFile, int flags)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xSync(chromiumFile->wrappedFile, flags);
+}
+
+int chromiumFileSize(sqlite3_file* sqliteFile, sqlite3_int64* pSize)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xFileSize(chromiumFile->wrappedFile, pSize);
+}
+
+int chromiumLock(sqlite3_file* sqliteFile, int eFileLock)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xLock(chromiumFile->wrappedFile, eFileLock);
+}
+
+int chromiumUnlock(sqlite3_file* sqliteFile, int eFileLock)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xUnlock(chromiumFile->wrappedFile, eFileLock);
+}
+
+int chromiumCheckReservedLock(sqlite3_file* sqliteFile, int* pResOut)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xCheckReservedLock(chromiumFile->wrappedFile, pResOut);
+}
+
+int chromiumFileControl(sqlite3_file* sqliteFile, int op, void* pArg)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xFileControl(chromiumFile->wrappedFile, op, pArg);
+}
+
+int chromiumSectorSize(sqlite3_file* sqliteFile)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xSectorSize(chromiumFile->wrappedFile);
+}
+
+int chromiumDeviceCharacteristics(sqlite3_file* sqliteFile)
+{
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(sqliteFile);
+    return chromiumFile->wrappedFile->pMethods->xDeviceCharacteristics(chromiumFile->wrappedFile);
+}
+
 // Opens a file.
 //
 // vfs - pointer to the sqlite3_vfs object.
@@ -59,7 +146,7 @@ namespace {
 // id - the structure that will manipulate the newly opened file.
 // desiredFlags - the desired open mode flags.
 // usedFlags - the actual open mode flags that were used.
-int chromiumOpen(sqlite3_vfs* vfs, const char* fileName, sqlite3_file* id, int desiredFlags, int* usedFlags)
+int chromiumOpenInternal(sqlite3_vfs* vfs, const char* fileName, sqlite3_file* id, int desiredFlags, int* usedFlags)
 {
     chromium_sqlite3_initialize_unix_sqlite3_file(id);
     int fd = -1;
@@ -95,6 +182,53 @@ int chromiumOpen(sqlite3_vfs* vfs, const char* fileName, sqlite3_file* id, int d
     return result;
 }
 
+int chromiumOpen(sqlite3_vfs* vfs, const char* fileName, sqlite3_file* id, int desiredFlags, int* usedFlags)
+{
+    sqlite3_vfs* wrappedVfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
+    sqlite3_file* wrappedFile = static_cast<sqlite3_file*>(sqlite3_malloc(wrappedVfs->szOsFile));
+    if (!wrappedFile)
+        return SQLITE_NOMEM;
+
+    // Make a local copy of the file name.  SQLite's os_unix.c appears to be written to allow caching the pointer passed
+    // in to this function, but that seems brittle.
+    char* wrappedFileName = sqlite3_mprintf("%s", fileName);
+    if (!wrappedFileName) {
+        sqlite3_free(wrappedFile);
+        return SQLITE_NOMEM;
+    }
+
+    // SQLite's unixOpen() makes assumptions about the structure of |fileName|.  Our local copy may not answer those
+    // assumptions correctly.
+    int rc = chromiumOpenInternal(vfs, fileName, wrappedFile, desiredFlags, usedFlags);
+    if (rc != SQLITE_OK) {
+        sqlite3_free(wrappedFileName);
+        sqlite3_free(wrappedFile);
+        return rc;
+    }
+
+    static sqlite3_io_methods chromiumIoMethods = {
+        1,
+        chromiumClose,
+        chromiumRead,
+        chromiumWrite,
+        chromiumTruncate,
+        chromiumSync,
+        chromiumFileSize,
+        chromiumLock,
+        chromiumUnlock,
+        chromiumCheckReservedLock,
+        chromiumFileControl,
+        chromiumSectorSize,
+        chromiumDeviceCharacteristics,
+        // Methods above are valid for version 1.
+    };
+    chromiumVfsFile* chromiumFile = reinterpret_cast<chromiumVfsFile*>(id);
+    chromiumFile->pMethods = &chromiumIoMethods;
+    chromiumFile->wrappedFile = wrappedFile;
+    chromiumFile->wrappedFileName = wrappedFileName;
+    return SQLITE_OK;
+}
+
 // Deletes the given file.
 //
 // vfs - pointer to the sqlite3_vfs object.
@@ -161,7 +295,7 @@ void chromiumDlError(sqlite3_vfs*, int bufSize, char* errorBuffer)
     sqlite3_snprintf(bufSize, errorBuffer, "Dynamic loading not supported");
 }
 
-void(*chromiumDlSym(sqlite3_vfs*, void *, const char*))(void)
+void(*chromiumDlSym(sqlite3_vfs*, void*, const char*))(void)
 {
     return 0;
 }
@@ -170,25 +304,25 @@ void chromiumDlClose(sqlite3_vfs*, void*)
 {
 }
 
-int chromiumRandomness(sqlite3_vfs *vfs, int bufSize, char *buffer)
+int chromiumRandomness(sqlite3_vfs* vfs, int bufSize, char* buffer)
 {
     sqlite3_vfs* wrappedVfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
     return wrappedVfs->xRandomness(wrappedVfs, bufSize, buffer);
 }
 
-int chromiumSleep(sqlite3_vfs *vfs, int microseconds)
+int chromiumSleep(sqlite3_vfs* vfs, int microseconds)
 {
     sqlite3_vfs* wrappedVfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
     return wrappedVfs->xSleep(wrappedVfs, microseconds);
 }
 
-int chromiumCurrentTime(sqlite3_vfs *vfs, double *prNow)
+int chromiumCurrentTime(sqlite3_vfs* vfs, double* prNow)
 {
     sqlite3_vfs* wrappedVfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
     return wrappedVfs->xCurrentTime(wrappedVfs, prNow);
 }
 
-int chromiumGetLastError(sqlite3_vfs *vfs, int e, char* s)
+int chromiumGetLastError(sqlite3_vfs* vfs, int e, char* s)
 {
     sqlite3_vfs* wrappedVfs = static_cast<sqlite3_vfs*>(vfs->pAppData);
     return wrappedVfs->xGetLastError(wrappedVfs, e, s);
@@ -201,7 +335,7 @@ void SQLiteFileSystem::registerSQLiteVFS()
     sqlite3_vfs* wrappedVfs = sqlite3_vfs_find("unix");
     static sqlite3_vfs chromium_vfs = {
         1,
-        wrappedVfs->szOsFile,
+        sizeof(chromiumVfsFile),
         wrappedVfs->mxPathname,
         0,
         "chromium_vfs",