diff options
Diffstat (limited to 'libs/androidfw/BackupHelpers.cpp')
| -rw-r--r-- | libs/androidfw/BackupHelpers.cpp | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/libs/androidfw/BackupHelpers.cpp b/libs/androidfw/BackupHelpers.cpp index 227de3b..9300794 100644 --- a/libs/androidfw/BackupHelpers.cpp +++ b/libs/androidfw/BackupHelpers.cpp @@ -478,7 +478,8 @@ void send_tarfile_chunk(BackupDataWriter* writer, const char* buffer, size_t siz } int write_tarfile(const String8& packageName, const String8& domain, - const String8& rootpath, const String8& filepath, BackupDataWriter* writer) + const String8& rootpath, const String8& filepath, off_t* outSize, + BackupDataWriter* writer) { // In the output stream everything is stored relative to the root const char* relstart = filepath.string() + rootpath.length(); @@ -488,6 +489,7 @@ int write_tarfile(const String8& packageName, const String8& domain, // If relpath is empty, it means this is the top of one of the standard named // domain directories, so we should just skip it if (relpath.length() == 0) { + *outSize = 0; return 0; } @@ -517,12 +519,25 @@ int write_tarfile(const String8& packageName, const String8& domain, return err; } + // very large files need a pax extended size header + if (s.st_size > 077777777777LL) { + needExtended = true; + } + String8 fullname; // for pax later on String8 prefix; const int isdir = S_ISDIR(s.st_mode); if (isdir) s.st_size = 0; // directories get no actual data in the tar stream + // Report the size, including a rough tar overhead estimation: 512 bytes for the + // overall tar file-block header, plus 2 blocks if using the pax extended format, + // plus the raw content size rounded up to a multiple of 512. + *outSize = 512 + (needExtended ? 1024 : 0) + 512*((s.st_size + 511)/512); + + // Measure case: we've returned the size; now return without moving data + if (!writer) return 0; + // !!! TODO: use mmap when possible to avoid churning the buffer cache // !!! TODO: this will break with symlinks; need to use readlink(2) int fd = open(filepath.string(), O_RDONLY); @@ -560,10 +575,6 @@ int write_tarfile(const String8& packageName, const String8& domain, snprintf(buf + 116, 8, "0%lo", (unsigned long)s.st_gid); // [ 124 : 12 ] file size in bytes - if (s.st_size > 077777777777LL) { - // very large files need a pax extended size header - needExtended = true; - } snprintf(buf + 124, 12, "%011llo", (isdir) ? 0LL : s.st_size); // [ 136 : 12 ] last mod time as a UTC time_t |