Example #1
0
    void CrwImage::readMetadata()
    {
#ifdef DEBUG
        std::cerr << "Reading CRW file " << io_->path() << "\n";
#endif
        if (io_->open() != 0) {
            throw Error(9, io_->path(), strError());
        }
        IoCloser closer(*io_);
        // Ensure that this is the correct image type
        if (!isThisType(*io_, false)) {
            if (io_->error() || io_->eof()) throw Error(14);
            throw Error(33);
        }
        clearMetadata();

        // Read the image into a memory buffer
        long imageSize = io_->size();
        DataBuf image(imageSize);
        io_->read(image.pData_, imageSize);
        if (io_->error() || io_->eof()) throw Error(14);

        // Parse the image
        RawMetadata::AutoPtr parseTree(new CiffHeader);
        parseTree->read(image.pData_, image.size_, 0, invalidByteOrder);
#ifdef DEBUG
        parseTree->print(std::cerr, invalidByteOrder);
#endif
        parseTree->extract(*this, invalidByteOrder);

    } // CrwImage::readMetadata
Example #2
0
    void MrwImage::readMetadata()
    {
#ifdef DEBUG
        std::cerr << "Reading MRW file " << io_->path() << "\n";
#endif
        if (io_->open() != 0) {
            throw Error(9, io_->path(), strError());
        }
        IoCloser closer(*io_);
        // Ensure that this is the correct image type
        if (!isThisType(*io_, false)) {
            if (io_->error() || io_->eof()) throw Error(14);
            throw Error(3, "MRW");
        }
        clearMetadata();

        // Find the TTW block and read it into a buffer
        uint32_t const len = 8;
        byte tmp[len];
        io_->read(tmp, len);
        uint32_t pos = len;
        uint32_t const end = getULong(tmp + 4, bigEndian);

        pos += len;
        if (pos > end) throw Error(14);
        io_->read(tmp, len);
        if (io_->error() || io_->eof()) throw Error(14);

        while (memcmp(tmp + 1, "TTW", 3) != 0) {
            uint32_t const siz = getULong(tmp + 4, bigEndian);
            pos += siz;
            if (pos > end) throw Error(14);
            io_->seek(siz, BasicIo::cur);
            if (io_->error() || io_->eof()) throw Error(14);

            pos += len;
            if (pos > end) throw Error(14);
            io_->read(tmp, len);
            if (io_->error() || io_->eof()) throw Error(14);
        }

        DataBuf buf(getULong(tmp + 4, bigEndian));
        io_->read(buf.pData_, buf.size_);
        if (io_->error() || io_->eof()) throw Error(14);

        TiffParser::decode(this, buf.pData_, buf.size_, TiffCreator::create);
    } // MrwImage::readMetadata
Example #3
0
    void TiffImage::readMetadata()
    {
#ifdef DEBUG
        std::cerr << "Reading TIFF file " << io_->path() << "\n";
#endif
        if (io_->open() != 0) {
            throw Error(9, io_->path(), strError());
        }
        IoCloser closer(*io_);
        // Ensure that this is the correct image type
        if (!isThisType(*io_, false)) {
            if (io_->error() || io_->eof()) throw Error(14);
            throw Error(33);
        }
        clearMetadata();

        // Read the image into a memory buffer
        long len = io_->size();
        DataBuf buf(len);
        io_->read(buf.pData_, len);
        if (io_->error() || io_->eof()) throw Error(14);

        TiffParser::decode(this, buf.pData_, buf.size_, TiffCreator::create);
    } // TiffImage::readMetadata
Example #4
0
 bool CrwImage::good() const
 {
     if (io_->open() != 0) return false;
     IoCloser closer(*io_);
     return isThisType(*io_, false);
 }
Example #5
0
    void JpegBase::doWriteMetadata(BasicIo& outIo)
    {
        if (!io_->isopen()) throw Error(20);
        if (!outIo.isopen()) throw Error(21);

        // Ensure that this is the correct image type
        if (!isThisType(*io_, true)) {
            if (io_->error() || io_->eof()) throw Error(20);
            throw Error(22);
        }

        const long bufMinSize = 36;
        long bufRead = 0;
        DataBuf buf(bufMinSize);
        const long seek = io_->tell();
        int count = 0;
        int search = 0;
        int insertPos = 0;
        int comPos = 0;
        int skipApp1Exif = -1;
        int skipApp1Xmp = -1;
        int skipApp13Ps3 = -1;
        int skipCom = -1;
        DataBuf psData;
        DataBuf rawExif;

        // Write image header
        if (writeHeader(outIo)) throw Error(21);

        // Read section marker
        int marker = advanceToMarker();
        if (marker < 0) throw Error(22);

        // First find segments of interest. Normally app0 is first and we want
        // to insert after it. But if app0 comes after com, app1 and app13 then
        // don't bother.
        while (marker != sos_ && marker != eoi_ && search < 5) {
            // Read size and signature (ok if this hits EOF)
            bufRead = io_->read(buf.pData_, bufMinSize);
            if (io_->error()) throw Error(20);
            uint16_t size = getUShort(buf.pData_, bigEndian);

            if (marker == app0_) {
                if (size < 2) throw Error(22);
                insertPos = count + 1;
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
            }
            else if (   skipApp1Exif == -1
                     && marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
                if (size < 8) throw Error(22);
                skipApp1Exif = count;
                ++search;
                // Seek to beginning and read the current Exif data
                io_->seek(8 - bufRead, BasicIo::cur);
                rawExif.alloc(size - 8);
                io_->read(rawExif.pData_, rawExif.size_);
                if (io_->error() || io_->eof()) throw Error(22);
            }
            else if (marker == app1_ && memcmp(buf.pData_ + 2, xmpId_, 29) == 0) {
                if (size < 31) throw Error(22);
                skipApp1Xmp = count;
                ++search;
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
            }
            else if (marker == app13_ && memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
#ifdef DEBUG
                std::cerr << "Found APP13 Photoshop PS3 segment\n";
#endif
                if (size < 16) throw Error(22);
                skipApp13Ps3 = count;
                ++search;
                io_->seek(16 - bufRead, BasicIo::cur);
                psData.alloc(size - 16);
                // Load PS data now to allow reinsertion at any point
                io_->read(psData.pData_, size - 16);
                if (io_->error() || io_->eof()) throw Error(20);
            }
            else if (marker == com_ && skipCom == -1) {
                if (size < 2) throw Error(22);
                // Jpegs can have multiple comments, but for now only handle
                // the first one (most jpegs only have one anyway).
                skipCom = count;
                ++search;
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
            }
            else {
                if (size < 2) throw Error(22);
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
            }
            // As in jpeg-6b/wrjpgcom.c:
            // We will insert the new comment marker just before SOFn.
            // This (a) causes the new comment to appear after, rather than before,
            // existing comments; and (b) ensures that comments come after any JFIF
            // or JFXX markers, as required by the JFIF specification.
            if (   comPos == 0
                && (   marker == sof0_
                    || marker == sof1_
                    || marker == sof2_
                    || marker == sof3_
                    || marker == sof5_
                    || marker == sof6_
                    || marker == sof7_
                    || marker == sof9_
                    || marker == sof10_
                    || marker == sof11_
                    || marker == sof13_
                    || marker == sof14_
                    || marker == sof15_)) {
                comPos = count;
                ++search;
            }
            marker = advanceToMarker();
            if (marker < 0) throw Error(22);
            ++count;
        }
        if (comPos == 0) {
            if (marker == eoi_) comPos = count;
            else comPos = insertPos;
            ++search;
        }
        if (exifData_.count() > 0) ++search;
        if (writeXmpFromPacket() == false && xmpData_.count() > 0) ++search;
        if (writeXmpFromPacket() == true && xmpPacket_.size() > 0) ++search;
        if (iptcData_.count() > 0) ++search;
        if (!comment_.empty()) ++search;

        io_->seek(seek, BasicIo::beg);
        count = 0;
        marker = advanceToMarker();
        if (marker < 0) throw Error(22);

        // To simplify this a bit, new segments are inserts at either the start
        // or right after app0. This is standard in most jpegs, but has the
        // potential to change segment ordering (which is allowed).
        // Segments are erased if there is no assigned metadata.
        while (marker != sos_ && search > 0) {
            // Read size and signature (ok if this hits EOF)
            bufRead = io_->read(buf.pData_, bufMinSize);
            if (io_->error()) throw Error(20);
            // Careful, this can be a meaningless number for empty
            // images with only an eoi_ marker
            uint16_t size = getUShort(buf.pData_, bigEndian);

            if (insertPos == count) {
                byte tmpBuf[64];
                // Write Exif data first so that - if there is no app0 - we
                // create "Exif images" according to the Exif standard.
                if (exifData_.count() > 0) {
                    Blob blob;
                    ByteOrder bo = byteOrder();
                    if (bo == invalidByteOrder) {
                        bo = littleEndian;
                        setByteOrder(bo);
                    }
                    WriteMethod wm = ExifParser::encode(blob,
                                                        rawExif.pData_,
                                                        rawExif.size_,
                                                        bo,
                                                        exifData_);
                    const byte* pExifData = rawExif.pData_;
                    uint32_t exifSize = rawExif.size_;
                    if (wm == wmIntrusive) {
                        pExifData = blob.size() > 0 ? &blob[0] : 0;
                        exifSize = static_cast<uint32_t>(blob.size());
                    }
                    if (exifSize > 0) {
                        // Write APP1 marker, size of APP1 field, Exif id and Exif data
                        tmpBuf[0] = 0xff;
                        tmpBuf[1] = app1_;

                        if (exifSize + 8 > 0xffff) throw Error(37, "Exif");
                        us2Data(tmpBuf + 2, static_cast<uint16_t>(exifSize + 8), bigEndian);
                        std::memcpy(tmpBuf + 4, exifId_, 6);
                        if (outIo.write(tmpBuf, 10) != 10) throw Error(21);

                        // Write new Exif data buffer
                        if (   outIo.write(pExifData, exifSize)
                            != static_cast<long>(exifSize)) throw Error(21);
                        if (outIo.error()) throw Error(21);
                        --search;
                    }
                }
                if (writeXmpFromPacket() == false) {
                    if (XmpParser::encode(xmpPacket_, xmpData_) > 1) {
#ifndef SUPPRESS_WARNINGS
                        std::cerr << "Error: Failed to encode XMP metadata.\n";
#endif
                    }
                }
                if (xmpPacket_.size() > 0) {
                    // Write APP1 marker, size of APP1 field, XMP id and XMP packet
                    tmpBuf[0] = 0xff;
                    tmpBuf[1] = app1_;

                    if (xmpPacket_.size() + 31 > 0xffff) throw Error(37, "XMP");
                    us2Data(tmpBuf + 2, static_cast<uint16_t>(xmpPacket_.size() + 31), bigEndian);
                    std::memcpy(tmpBuf + 4, xmpId_, 29);
                    if (outIo.write(tmpBuf, 33) != 33) throw Error(21);

                    // Write new XMP packet
                    if (   outIo.write(reinterpret_cast<const byte*>(xmpPacket_.data()), static_cast<long>(xmpPacket_.size()))
                        != static_cast<long>(xmpPacket_.size())) throw Error(21);
                    if (outIo.error()) throw Error(21);
                    --search;
                }
                if (psData.size_ > 0 || iptcData_.count() > 0) {
                    // Set the new IPTC IRB, keeps existing IRBs but removes the
                    // IPTC block if there is no new IPTC data to write
                    DataBuf newPsData = Photoshop::setIptcIrb(psData.pData_,
                                                              psData.size_,
                                                              iptcData_);
                    if (newPsData.size_ > 0) {
                        // Write APP13 marker, new size, and ps3Id
                        tmpBuf[0] = 0xff;
                        tmpBuf[1] = app13_;

                        if (newPsData.size_ + 16 > 0xffff) throw Error(37, "IPTC");
                        us2Data(tmpBuf + 2, static_cast<uint16_t>(newPsData.size_ + 16), bigEndian);
                        std::memcpy(tmpBuf + 4, Photoshop::ps3Id_, 14);
                        if (outIo.write(tmpBuf, 18) != 18) throw Error(21);
                        if (outIo.error()) throw Error(21);

                        // Write new Photoshop IRB data buffer
                        if (   outIo.write(newPsData.pData_, newPsData.size_)
                            != newPsData.size_) throw Error(21);
                        if (outIo.error()) throw Error(21);
                    }
                    if (iptcData_.count() > 0) {
                        --search;
                    }
                }
            }
            if (comPos == count) {
                if (!comment_.empty()) {
                    byte tmpBuf[4];
                    // Write COM marker, size of comment, and string
                    tmpBuf[0] = 0xff;
                    tmpBuf[1] = com_;

                    if (comment_.length() + 3 > 0xffff) throw Error(37, "JPEG comment");
                    us2Data(tmpBuf + 2, static_cast<uint16_t>(comment_.length() + 3), bigEndian);

                    if (outIo.write(tmpBuf, 4) != 4) throw Error(21);
                    if (outIo.write((byte*)comment_.data(), (long)comment_.length())
                        != (long)comment_.length()) throw Error(21);
                    if (outIo.putb(0)==EOF) throw Error(21);
                    if (outIo.error()) throw Error(21);
                    --search;
                }
                --search;
            }
            if (marker == eoi_) {
                break;
            }
            else if (   skipApp1Exif == count
                     || skipApp1Xmp  == count
                     || skipApp13Ps3 == count
                     || skipCom      == count) {
                --search;
                io_->seek(size-bufRead, BasicIo::cur);
            }
            else {
                if (size < 2) throw Error(22);
                buf.alloc(size+2);
                io_->seek(-bufRead-2, BasicIo::cur);
                io_->read(buf.pData_, size+2);
                if (io_->error() || io_->eof()) throw Error(20);
                if (outIo.write(buf.pData_, size+2) != size+2) throw Error(21);
                if (outIo.error()) throw Error(21);
            }

            // Next marker
            marker = advanceToMarker();
            if (marker < 0) throw Error(22);
            ++count;
        }

        // Copy rest of the Io
        io_->seek(-2, BasicIo::cur);
        buf.alloc(4096);
        long readSize = 0;
        while ((readSize=io_->read(buf.pData_, buf.size_))) {
            if (outIo.write(buf.pData_, readSize) != readSize) throw Error(21);
        }
        if (outIo.error()) throw Error(21);

    } // JpegBase::doWriteMetadata
Example #6
0
    void JpegBase::readMetadata()
    {
        int rc = 0; // Todo: this should be the return value

        if (io_->open() != 0) throw Error(9, io_->path(), strError());
        IoCloser closer(*io_);
        // Ensure that this is the correct image type
        if (!isThisType(*io_, true)) {
            if (io_->error() || io_->eof()) throw Error(14);
            throw Error(15);
        }
        clearMetadata();
        int search = 5;
        const long bufMinSize = 36;
        long bufRead = 0;
        DataBuf buf(bufMinSize);
        Blob iptcBlob;
        bool foundPsData = false;
        bool foundExifData = false;

        // Read section marker
        int marker = advanceToMarker();
        if (marker < 0) throw Error(15);

        while (marker != sos_ && marker != eoi_ && search > 0) {
            // Read size and signature (ok if this hits EOF)
            std::memset(buf.pData_, 0x0, buf.size_);
            bufRead = io_->read(buf.pData_, bufMinSize);
            if (io_->error()) throw Error(14);
            if (bufRead < 2) throw Error(15);
            uint16_t size = getUShort(buf.pData_, bigEndian);

            if (foundPsData && marker != app13_) {
                // For IPTC, decrement search only after all app13 segments are
                // loaded, assuming they all appear in sequence. But decode IPTC
                // data after the loop, in case an app13 is the last segment
                // before sos or eoi.
                foundPsData = false;
                if (--search == 0) break;
            }

            if (   !foundExifData
                && marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
                if (size < 8) {
                    rc = 1;
                    break;
                }
                // Seek to beginning and read the Exif data
                io_->seek(8 - bufRead, BasicIo::cur);
                DataBuf rawExif(size - 8);
                io_->read(rawExif.pData_, rawExif.size_);
                if (io_->error() || io_->eof()) throw Error(14);
                ByteOrder bo = ExifParser::decode(exifData_, rawExif.pData_, rawExif.size_);
                setByteOrder(bo);
                if (rawExif.size_ > 0 && byteOrder() == invalidByteOrder) {
#ifndef SUPPRESS_WARNINGS
                    std::cerr << "Warning: Failed to decode Exif metadata.\n";
#endif
                    exifData_.clear();
                }
                --search;
                foundExifData = true;
            }
            else if (marker == app1_ && memcmp(buf.pData_ + 2, xmpId_, 29) == 0) {
                if (size < 31) {
                    rc = 6;
                    break;
                }
                // Seek to beginning and read the XMP packet
                io_->seek(31 - bufRead, BasicIo::cur);
                DataBuf xmpPacket(size - 31);
                io_->read(xmpPacket.pData_, xmpPacket.size_);
                if (io_->error() || io_->eof()) throw Error(14);
                xmpPacket_.assign(reinterpret_cast<char*>(xmpPacket.pData_), xmpPacket.size_);
                if (xmpPacket_.size() > 0 && XmpParser::decode(xmpData_, xmpPacket_)) {
#ifndef SUPPRESS_WARNINGS
                    std::cerr << "Warning: Failed to decode XMP metadata.\n";
#endif
                }
                --search;
            }
            else if (   marker == app13_
                     && memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
                if (size < 16) {
                    rc = 2;
                    break;
                }
                // Read the rest of the APP13 segment
                io_->seek(16 - bufRead, BasicIo::cur);
                DataBuf psData(size - 16);
                io_->read(psData.pData_, psData.size_);
                if (io_->error() || io_->eof()) throw Error(14);
                const byte *record = 0;
                uint32_t sizeIptc = 0;
                uint32_t sizeHdr = 0;
#ifdef DEBUG
                std::cerr << "Found app13 segment, size = " << size << "\n";
                //hexdump(std::cerr, psData.pData_, psData.size_);
#endif
                // Find actual IPTC data within the APP13 segment
                const byte* pEnd = psData.pData_ + psData.size_;
                const byte* pCur = psData.pData_;
                while (   pCur < pEnd
                       && 0 == Photoshop::locateIptcIrb(pCur,
                                                        static_cast<long>(pEnd - pCur),
                                                        &record,
                                                        &sizeHdr,
                                                        &sizeIptc)) {
                    if (sizeIptc) {
#ifdef DEBUG
                        std::cerr << "Found IPTC IRB, size = " << sizeIptc << "\n";
#endif
                        append(iptcBlob, record + sizeHdr, sizeIptc);
                    }
                    pCur = record + sizeHdr + sizeIptc;
                    pCur += (sizeIptc & 1);
                }
                foundPsData = true;
            }
            else if (marker == com_ && comment_.empty())
            {
                if (size < 2) {
                    rc = 3;
                    break;
                }
                // JPEGs can have multiple comments, but for now only read
                // the first one (most jpegs only have one anyway). Comments
                // are simple single byte ISO-8859-1 strings.
                io_->seek(2 - bufRead, BasicIo::cur);
                DataBuf comment(size - 2);
                io_->read(comment.pData_, comment.size_);
                if (io_->error() || io_->eof()) throw Error(14);
                comment_.assign(reinterpret_cast<char*>(comment.pData_), comment.size_);
                while (   comment_.length()
                       && comment_.at(comment_.length()-1) == '\0') {
                    comment_.erase(comment_.length()-1);
                }
                --search;
            }
            else if (   pixelHeight_ == 0
                     && (   marker == sof0_  || marker == sof1_  || marker == sof2_
                         || marker == sof3_  || marker == sof5_  || marker == sof6_
                         || marker == sof7_  || marker == sof9_  || marker == sof10_
                         || marker == sof11_ || marker == sof13_ || marker == sof14_
                         || marker == sof15_)) {
                // We hit a SOFn (start-of-frame) marker
                if (size < 8) {
                    rc = 7;
                    break;
                }
                pixelHeight_ = getUShort(buf.pData_ + 3, bigEndian);
                pixelWidth_ = getUShort(buf.pData_ + 5, bigEndian);
                if (pixelHeight_ != 0) --search;
                // Skip the remainder of the segment
                io_->seek(size-bufRead, BasicIo::cur);
            }
            else {
                if (size < 2) {
                    rc = 4;
                    break;
                }
                // Skip the remainder of the unknown segment
                if (io_->seek(size - bufRead, BasicIo::cur)) throw Error(14);
            }
            // Read the beginning of the next segment
            marker = advanceToMarker();
            if (marker < 0) {
                rc = 5;
                break;
            }
        } // while there are segments to process

        if (   iptcBlob.size() > 0
            && IptcParser::decode(iptcData_,
                                  &iptcBlob[0],
                                  static_cast<uint32_t>(iptcBlob.size()))) {
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: Failed to decode IPTC metadata.\n";
#endif
            iptcData_.clear();
        }

        if (rc != 0) {
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: JPEG format error, rc = " << rc << "\n";
#endif
        }
    } // JpegBase::readMetadata
Example #7
0
    void JpegBase::doWriteMetadata(BasicIo& outIo)
    {
        if (!io_->isopen()) throw Error(20);
        if (!outIo.isopen()) throw Error(21);

        // Ensure that this is the correct image type
        if (!isThisType(*io_, true)) {
            if (io_->error() || io_->eof()) throw Error(20);
            throw Error(22);
        }

        const long bufMinSize = 16;
        long bufRead = 0;
        DataBuf buf(bufMinSize);
        const long seek = io_->tell();
        int count = 0;
        int search = 0;
        int insertPos = 0;
        int skipApp1Exif = -1;
        int skipApp13Ps3 = -1;
        int skipCom = -1;
        DataBuf psData;

        // Write image header
        if (writeHeader(outIo)) throw Error(21);

        // Read section marker
        int marker = advanceToMarker();
        if (marker < 0) throw Error(22);

        // First find segments of interest. Normally app0 is first and we want
        // to insert after it. But if app0 comes after com, app1 and app13 then
        // don't bother.
        while (marker != sos_ && marker != eoi_ && search < 3) {
            // Read size and signature (ok if this hits EOF)
            bufRead = io_->read(buf.pData_, bufMinSize);
            if (io_->error()) throw Error(20);
            uint16_t size = getUShort(buf.pData_, bigEndian);

            if (marker == app0_) {
                if (size < 2) throw Error(22);
                insertPos = count + 1;
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
            }
            else if (marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
                if (size < 8) throw Error(22);
                skipApp1Exif = count;
                ++search;
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
            }
            else if (marker == app13_ && memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
                if (size < 16) throw Error(22);
                skipApp13Ps3 = count;
                ++search;
                // needed if bufMinSize!=16: io_->seek(16-bufRead, BasicIo::cur);
                psData.alloc(size - 16);
                // Load PS data now to allow reinsertion at any point
                io_->read(psData.pData_, psData.size_);
                if (io_->error() || io_->eof()) throw Error(20);
            }
            else if (marker == com_ && skipCom == -1) {
                if (size < 2) throw Error(22);
                // Jpegs can have multiple comments, but for now only handle
                // the first one (most jpegs only have one anyway).
                skipCom = count;
                ++search;
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
            }
            else {
                if (size < 2) throw Error(22);
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(22);
            }
            marker = advanceToMarker();
            if (marker < 0) throw Error(22);
            ++count;
        }

        if (exifData_.count() > 0) ++search;
        if (iptcData_.count() > 0) ++search;
        if (!comment_.empty()) ++search;

        io_->seek(seek, BasicIo::beg);
        count = 0;
        marker = advanceToMarker();
        if (marker < 0) throw Error(22);

        // To simplify this a bit, new segments are inserts at either the start
        // or right after app0. This is standard in most jpegs, but has the
        // potential to change segment ordering (which is allowed).
        // Segments are erased if there is no assigned metadata.
        while (marker != sos_ && search > 0) {
            // Read size and signature (ok if this hits EOF)
            bufRead = io_->read(buf.pData_, bufMinSize);
            if (io_->error()) throw Error(20);
            // Careful, this can be a meaningless number for empty
            // images with only an eoi_ marker
            uint16_t size = getUShort(buf.pData_, bigEndian);

            if (insertPos == count) {
                byte tmpBuf[18];
                if (!comment_.empty()) {
                    // Write COM marker, size of comment, and string
                    tmpBuf[0] = 0xff;
                    tmpBuf[1] = com_;

                    if (comment_.length() + 3 > 0xffff) throw Error(37, "JPEG comment");
                    us2Data(tmpBuf + 2, static_cast<uint16_t>(comment_.length() + 3), bigEndian);

                    if (outIo.write(tmpBuf, 4) != 4) throw Error(21);
                    if (outIo.write((byte*)comment_.data(), (long)comment_.length())
                        != (long)comment_.length()) throw Error(21);
                    if (outIo.putb(0)==EOF) throw Error(21);
                    if (outIo.error()) throw Error(21);
                    --search;
                }
                if (exifData_.count() > 0) {
                    DataBuf rawExif = exifData_.copy();
                    if (rawExif.size_ > 0) {
                        // Write APP1 marker, size of APP1 field, Exif id and Exif data
                        tmpBuf[0] = 0xff;
                        tmpBuf[1] = app1_;

                        if (rawExif.size_ + 8 > 0xffff) throw Error(37, "Exif");
                        us2Data(tmpBuf + 2, static_cast<uint16_t>(rawExif.size_ + 8), bigEndian);
                        memcpy(tmpBuf + 4, exifId_, 6);
                        if (outIo.write(tmpBuf, 10) != 10) throw Error(21);

                        // Write new Exif data buffer
                        if (   outIo.write(rawExif.pData_, rawExif.size_)
                               != rawExif.size_) throw Error(21);
                        if (outIo.error()) throw Error(21);
                        --search;
                    }
                }
                if (psData.size_ > 0 || iptcData_.count() > 0) {
                    // Set the new IPTC IRB, keeps existing IRBs but removes the
                    // IPTC block if there is no new IPTC data to write
                    DataBuf newPsData = Photoshop::setIptcIrb(psData.pData_,
                                                              psData.size_,
                                                              iptcData_);
                    if (newPsData.size_ > 0) {
                        // Write APP13 marker, new size, and ps3Id
                        tmpBuf[0] = 0xff;
                        tmpBuf[1] = app13_;

                        if (newPsData.size_ + 16 > 0xffff) throw Error(37, "IPTC");
                        us2Data(tmpBuf + 2, static_cast<uint16_t>(newPsData.size_ + 16), bigEndian);
                        memcpy(tmpBuf + 4, Photoshop::ps3Id_, 14);
                        if (outIo.write(tmpBuf, 18) != 18) throw Error(21);
                        if (outIo.error()) throw Error(21);

                        // Write new Photoshop IRB data buffer
                        if (   outIo.write(newPsData.pData_, newPsData.size_)
                            != newPsData.size_) throw Error(21);
                        if (outIo.error()) throw Error(21);
                    }
                    if (iptcData_.count() > 0) {
                        --search;
                    }
                }
            }
            if (marker == eoi_) {
                break;
            }
            else if (skipApp1Exif==count || skipApp13Ps3==count || skipCom==count) {
                --search;
                io_->seek(size-bufRead, BasicIo::cur);
            }
            else {
                if (size < 2) throw Error(22);
                buf.alloc(size+2);
                io_->seek(-bufRead-2, BasicIo::cur);
                io_->read(buf.pData_, size+2);
                if (io_->error() || io_->eof()) throw Error(20);
                if (outIo.write(buf.pData_, size+2) != size+2) throw Error(21);
                if (outIo.error()) throw Error(21);
            }

            // Next marker
            marker = advanceToMarker();
            if (marker < 0) throw Error(22);
            ++count;
        }

        // Copy rest of the Io
        io_->seek(-2, BasicIo::cur);
        buf.alloc(4096);
        long readSize = 0;
        while ((readSize=io_->read(buf.pData_, buf.size_))) {
            if (outIo.write(buf.pData_, readSize) != readSize) throw Error(21);
        }
        if (outIo.error()) throw Error(21);

    } // JpegBase::doWriteMetadata
Example #8
0
    void JpegBase::readMetadata()
    {
        int rc = 0; // Todo: this should be the return value

        if (io_->open() != 0) throw Error(9, io_->path(), strError());
        IoCloser closer(*io_);
        // Ensure that this is the correct image type
        if (!isThisType(*io_, true)) {
            if (io_->error() || io_->eof()) throw Error(14);
            throw Error(15);
        }
        clearMetadata();
        int search = 3;
        const long bufMinSize = 16;
        long bufRead = 0;
        DataBuf buf(bufMinSize);

        // Read section marker
        int marker = advanceToMarker();
        if (marker < 0) throw Error(15);

        while (marker != sos_ && marker != eoi_ && search > 0) {
            // Read size and signature (ok if this hits EOF)
            bufRead = io_->read(buf.pData_, bufMinSize);
            if (io_->error()) throw Error(14);
            uint16_t size = getUShort(buf.pData_, bigEndian);

            if (marker == app1_ && memcmp(buf.pData_ + 2, exifId_, 6) == 0) {
                if (size < 8) {
                    rc = 1;
                    break;
                }
                // Seek to beginning and read the Exif data
                io_->seek(8-bufRead, BasicIo::cur);
                long sizeExifData = size - 8;
                DataBuf rawExif(sizeExifData);
                io_->read(rawExif.pData_, sizeExifData);
                if (io_->error() || io_->eof()) throw Error(14);
                if (exifData_.load(rawExif.pData_, sizeExifData)) {
#ifndef SUPPRESS_WARNINGS
                    std::cerr << "Warning: Failed to decode Exif metadata.\n";
#endif
                    exifData_.clear();
                }
                --search;
            }
            else if (   marker == app13_
                     && memcmp(buf.pData_ + 2, Photoshop::ps3Id_, 14) == 0) {
                if (size < 16) {
                    rc = 2;
                    break;
                }
                // Read the rest of the APP13 segment
                // needed if bufMinSize!=16: io_->seek(16-bufRead, BasicIo::cur);
                DataBuf psData(size - 16);
                io_->read(psData.pData_, psData.size_);
                if (io_->error() || io_->eof()) throw Error(14);
                const byte *record = 0;
                uint32_t sizeIptc = 0;
                uint32_t sizeHdr = 0;
                // Find actual Iptc data within the APP13 segment
                if (!Photoshop::locateIptcIrb(psData.pData_, psData.size_,
                                              &record, &sizeHdr, &sizeIptc)) {
                    if (sizeIptc) {
                        if (iptcData_.load(record + sizeHdr, sizeIptc)) {
#ifndef SUPPRESS_WARNINGS
                            std::cerr << "Warning: Failed to decode IPTC metadata.\n";
#endif
                            iptcData_.clear();
                        }
                    }
                }
                --search;
            }
            else if (marker == com_ && comment_.empty())
            {
                if (size < 2) {
                    rc = 3;
                    break;
                }
                // Jpegs can have multiple comments, but for now only read
                // the first one (most jpegs only have one anyway). Comments
                // are simple single byte ISO-8859-1 strings.
                io_->seek(2-bufRead, BasicIo::cur);
                buf.alloc(size-2);
                io_->read(buf.pData_, size-2);
                if (io_->error() || io_->eof()) throw Error(14);
                comment_.assign(reinterpret_cast<char*>(buf.pData_), size-2);
                while (   comment_.length()
                       && comment_.at(comment_.length()-1) == '\0') {
                    comment_.erase(comment_.length()-1);
                }
                --search;
            }
            else {
                if (size < 2) {
                    rc = 4;
                    break;
                }
                // Skip the remainder of the unknown segment
                if (io_->seek(size-bufRead, BasicIo::cur)) throw Error(14);
            }
            // Read the beginning of the next segment
            marker = advanceToMarker();
            if (marker < 0) {
                rc = 5;
                break;
            }
        } // while there are segments to process
        if (rc != 0) {
#ifndef SUPPRESS_WARNINGS
            std::cerr << "Warning: JPEG format error, rc = " << rc << "\n";
#endif
        }
    } // JpegBase::readMetadata