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Commit 1dfd9f8a authored by Kenny Root's avatar Kenny Root
Browse files

Initial tool for OBB manipulation 

Add "obbtool" host command for adding, removing, and querying Opaque
Binary Blob (OBB) information from a file.

Change-Id: Id2ac41e687ad2a500c362616d6738a8ae7e8f5c3
parent 76263ffc

include/utils/ObbFile.h

+4 −0
Original line number Diff line number Diff line
@@ -35,6 +35,8 @@ public: 
    bool readFrom(int fd);

    bool writeTo(const char* filename);

    bool writeTo(int fd);

    bool removeFrom(const char* filename);

    bool removeFrom(int fd);



    const char* getFileName() const {

        return mFileName;
@@ -78,6 +80,8 @@ private: 


    size_t mFileSize;



    size_t mFooterStart;



    unsigned char* mReadBuf;



    bool parseObbFile(int fd);

libs/utils/ObbFile.cpp

+39 −3
Original line number Diff line number Diff line
@@ -156,9 +156,9 @@ bool ObbFile::parseObbFile(int fd) 
            return false;

        }



        if (footerSize < kFooterMinSize) {

            LOGW("claimed footer size is too small (%08zx; minimum size is 0x%x)\n",

                    footerSize, kFooterMinSize);

        if (footerSize < (kFooterMinSize - kFooterTagSize)) {

            LOGW("claimed footer size is too small (0x%zx; minimum size is 0x%x)\n",

                    footerSize, kFooterMinSize - kFooterTagSize);

            return false;

        }

    }
@@ -169,6 +169,8 @@ bool ObbFile::parseObbFile(int fd) 
        return false;

    }



    mFooterStart = fileOffset;



    char* scanBuf = (char*)malloc(footerSize);

    if (scanBuf == NULL) {

        LOGW("couldn't allocate scanBuf: %s\n", strerror(errno));
@@ -293,4 +295,38 @@ bool ObbFile::writeTo(int fd) 
    return true;

}



bool ObbFile::removeFrom(const char* filename)

{

    int fd;

    bool success = false;



    fd = ::open(filename, O_RDWR);

    if (fd < 0) {

        goto out;

    }

    success = removeFrom(fd);

    close(fd);



out:

    if (!success) {

        LOGW("failed to remove signature from %s: %s\n", filename, strerror(errno));

    }

    return success;

}



bool ObbFile::removeFrom(int fd)

{

    if (fd < 0) {

        return false;

    }



    if (!readFrom(fd)) {

        return false;

    }



    ftruncate(fd, mFooterStart);



    return true;

}



}