root/3rdparty/openexr/IlmImf/ImfHeader.cpp

DEFINITIONS

1. initialize
2. usesLongNames
3. checkIsNullTerminated
4. insert
5. insert
6. begin
7. begin
8. end
9. end
10. find
11. find
12. find
13. find
14. displayWindow
15. displayWindow
16. dataWindow
17. dataWindow
18. pixelAspectRatio
19. pixelAspectRatio
20. screenWindowCenter
21. screenWindowCenter
22. screenWindowWidth
23. screenWindowWidth
24. channels
25. channels
26. lineOrder
27. lineOrder
28. compression
29. compression
30. setTileDescription
31. hasTileDescription
32. tileDescription
33. tileDescription
34. setPreviewImage
35. previewImage
36. previewImage
37. hasPreviewImage
38. sanityCheck
39. setMaxImageSize
40. setMaxTileSize
41. writeTo
42. readFrom
43. staticInitialize

///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////



//-----------------------------------------------------------------------------
//
//      class Header
//
//-----------------------------------------------------------------------------

#include <ImfHeader.h>
#include <ImfStdIO.h>
#include <ImfVersion.h>
#include <ImfCompressor.h>
#include <ImfMisc.h>
#include <ImfBoxAttribute.h>
#include <ImfChannelListAttribute.h>
#include <ImfChromaticitiesAttribute.h>
#include <ImfCompressionAttribute.h>
#include <ImfDoubleAttribute.h>
#include <ImfEnvmapAttribute.h>
#include <ImfFloatAttribute.h>
#include <ImfIntAttribute.h>
#include <ImfKeyCodeAttribute.h>
#include <ImfLineOrderAttribute.h>
#include <ImfMatrixAttribute.h>
#include <ImfOpaqueAttribute.h>
#include <ImfPreviewImageAttribute.h>
#include <ImfRationalAttribute.h>
#include <ImfStringAttribute.h>
#include <ImfStringVectorAttribute.h>
#include <ImfTileDescriptionAttribute.h>
#include <ImfTimeCodeAttribute.h>
#include <ImfVecAttribute.h>
#include "IlmThreadMutex.h"
#include "Iex.h"
#include <sstream>
#include <stdlib.h>
#include <time.h>


namespace Imf {

using namespace std;
using Imath::Box2i;
using Imath::V2i;
using Imath::V2f;
using IlmThread::Mutex;
using IlmThread::Lock;


namespace {

int maxImageWidth = 0;
int maxImageHeight = 0;
int maxTileWidth = 0;
int maxTileHeight = 0;


void
initialize (Header &header,
        const Box2i &displayWindow,
        const Box2i &dataWindow,
        float pixelAspectRatio,
        const V2f &screenWindowCenter,
        float screenWindowWidth,
        LineOrder lineOrder,
        Compression compression)
{
    header.insert ("displayWindow", Box2iAttribute (displayWindow));
    header.insert ("dataWindow", Box2iAttribute (dataWindow));
    header.insert ("pixelAspectRatio", FloatAttribute (pixelAspectRatio));
    header.insert ("screenWindowCenter", V2fAttribute (screenWindowCenter));
    header.insert ("screenWindowWidth", FloatAttribute (screenWindowWidth));
    header.insert ("lineOrder", LineOrderAttribute (lineOrder));
    header.insert ("compression", CompressionAttribute (compression));
    header.insert ("channels", ChannelListAttribute ());
}


bool
usesLongNames (const Header &header)
{
    //
    // If an OpenEXR file contains any attribute names, attribute type names
    // or channel names longer than 31 characters, then the file cannot be
    // read by older versions of the IlmImf library (up to OpenEXR 1.6.1).
    // Before writing the file header, we check if the header contains
    // any names longer than 31 characters; if it does, then we set the
    // LONG_NAMES_FLAG in the file version number.  Older versions of the
    // IlmImf library will refuse to read files that have the LONG_NAMES_FLAG
    // set.  Without the flag, older versions of the library would mis-
    // interpret the file as broken.
    //

    for (Header::ConstIterator i = header.begin();
         i != header.end();
         ++i)
    {
        if (strlen (i.name()) >= 32 || strlen (i.attribute().typeName()) >= 32)
            return true;
    }

    const ChannelList &channels = header.channels();

    for (ChannelList::ConstIterator i = channels.begin();
         i != channels.end();
         ++i)
    {
        if (strlen (i.name()) >= 32)
            return true;
    }

    return false;
}

template <size_t N>
void checkIsNullTerminated (const char (&str)[N], const char *what)
{
    for (int i = 0; i < N; ++i) {
        if (str[i] == '\0')
            return;
    }
    std::stringstream s;
    s << "Invalid " << what << ": it is more than " << (N - 1)
        << " characters long.";
    throw Iex::InputExc(s);
}

} // namespace


Header::Header (int width,
        int height,
        float pixelAspectRatio,
        const V2f &screenWindowCenter,
        float screenWindowWidth,
        LineOrder lineOrder,
        Compression compression)
:
    _map()
{
    staticInitialize();

    Box2i displayWindow (V2i (0, 0), V2i (width - 1, height - 1));

    initialize (*this,
        displayWindow,
        displayWindow,
        pixelAspectRatio,
        screenWindowCenter,
        screenWindowWidth,
        lineOrder,
        compression);
}


Header::Header (int width,
        int height,
        const Box2i &dataWindow,
        float pixelAspectRatio,
        const V2f &screenWindowCenter,
        float screenWindowWidth,
        LineOrder lineOrder,
        Compression compression)
:
    _map()
{
    staticInitialize();

    Box2i displayWindow (V2i (0, 0), V2i (width - 1, height - 1));

    initialize (*this,
        displayWindow,
        dataWindow,
        pixelAspectRatio,
        screenWindowCenter,
        screenWindowWidth,
        lineOrder,
        compression);
}


Header::Header (const Box2i &displayWindow,
        const Box2i &dataWindow,
        float pixelAspectRatio,
        const V2f &screenWindowCenter,
        float screenWindowWidth,
        LineOrder lineOrder,
        Compression compression)
:
    _map()
{
    staticInitialize();

    initialize (*this,
        displayWindow,
        dataWindow,
        pixelAspectRatio,
        screenWindowCenter,
        screenWindowWidth,
        lineOrder,
        compression);
}


Header::Header (const Header &other): _map()
{
    for (AttributeMap::const_iterator i = other._map.begin();
     i != other._map.end();
     ++i)
    {
    insert (*i->first, *i->second);
    }
}


Header::~Header ()
{
    for (AttributeMap::iterator i = _map.begin();
     i != _map.end();
     ++i)
    {
     delete i->second;
    }
}


Header &
Header::operator = (const Header &other)
{
    if (this != &other)
    {
    for (AttributeMap::iterator i = _map.begin();
         i != _map.end();
         ++i)
    {
         delete i->second;
    }

    _map.erase (_map.begin(), _map.end());

    for (AttributeMap::const_iterator i = other._map.begin();
         i != other._map.end();
         ++i)
    {
        insert (*i->first, *i->second);
    }
    }

    return *this;
}


void
Header::insert (const char name[], const Attribute &attribute)
{
    if (name[0] == 0)
    THROW (Iex::ArgExc, "Image attribute name cannot be an empty string.");

    AttributeMap::iterator i = _map.find (name);

    if (i == _map.end())
    {
    Attribute *tmp = attribute.copy();

    try
    {
        _map[name] = tmp;
    }
    catch (...)
    {
        delete tmp;
        throw;
    }
    }
    else
    {
    if (strcmp (i->second->typeName(), attribute.typeName()))
        THROW (Iex::TypeExc, "Cannot assign a value of "
                 "type \"" << attribute.typeName() << "\" "
                 "to image attribute \"" << name << "\" of "
                 "type \"" << i->second->typeName() << "\".");

    Attribute *tmp = attribute.copy();
    delete i->second;
    i->second = tmp;
    }
}


void
Header::insert (const string &name, const Attribute &attribute)
{
    insert (name.c_str(), attribute);
}


Attribute &
Header::operator [] (const char name[])
{
    AttributeMap::iterator i = _map.find (name);

    if (i == _map.end())
    THROW (Iex::ArgExc, "Cannot find image attribute \"" << name << "\".");

    return *i->second;
}


const Attribute &
Header::operator [] (const char name[]) const
{
    AttributeMap::const_iterator i = _map.find (name);

    if (i == _map.end())
    THROW (Iex::ArgExc, "Cannot find image attribute \"" << name << "\".");

    return *i->second;
}


Attribute &
Header::operator [] (const string &name)
{
    return this->operator[] (name.c_str());
}


const Attribute &
Header::operator [] (const string &name) const
{
    return this->operator[] (name.c_str());
}


Header::Iterator
Header::begin ()
{
    return _map.begin();
}


Header::ConstIterator
Header::begin () const
{
    return _map.begin();
}


Header::Iterator
Header::end ()
{
    return _map.end();
}


Header::ConstIterator
Header::end () const
{
    return _map.end();
}


Header::Iterator
Header::find (const char name[])
{
    return _map.find (name);
}


Header::ConstIterator
Header::find (const char name[]) const
{
    return _map.find (name);
}


Header::Iterator
Header::find (const string &name)
{
    return find (name.c_str());
}


Header::ConstIterator
Header::find (const string &name) const
{
    return find (name.c_str());
}


Imath::Box2i &
Header::displayWindow ()
{
    return static_cast <Box2iAttribute &>
    ((*this)["displayWindow"]).value();
}


const Imath::Box2i &
Header::displayWindow () const
{
    return static_cast <const Box2iAttribute &>
    ((*this)["displayWindow"]).value();
}


Imath::Box2i &
Header::dataWindow ()
{
    return static_cast <Box2iAttribute &>
    ((*this)["dataWindow"]).value();
}


const Imath::Box2i &
Header::dataWindow () const
{
    return static_cast <const Box2iAttribute &>
    ((*this)["dataWindow"]).value();
}


float &
Header::pixelAspectRatio ()
{
    return static_cast <FloatAttribute &>
    ((*this)["pixelAspectRatio"]).value();
}


const float &
Header::pixelAspectRatio () const
{
    return static_cast <const FloatAttribute &>
    ((*this)["pixelAspectRatio"]).value();
}


Imath::V2f &
Header::screenWindowCenter ()
{
    return static_cast <V2fAttribute &>
    ((*this)["screenWindowCenter"]).value();
}


const Imath::V2f &
Header::screenWindowCenter () const
{
    return static_cast <const V2fAttribute &>
    ((*this)["screenWindowCenter"]).value();
}


float &
Header::screenWindowWidth ()
{
    return static_cast <FloatAttribute &>
    ((*this)["screenWindowWidth"]).value();
}


const float &
Header::screenWindowWidth () const
{
    return static_cast <const FloatAttribute &>
    ((*this)["screenWindowWidth"]).value();
}


ChannelList &
Header::channels ()
{
    return static_cast <ChannelListAttribute &>
    ((*this)["channels"]).value();
}


const ChannelList &
Header::channels () const
{
    return static_cast <const ChannelListAttribute &>
    ((*this)["channels"]).value();
}


LineOrder &
Header::lineOrder ()
{
    return static_cast <LineOrderAttribute &>
    ((*this)["lineOrder"]).value();
}


const LineOrder &
Header::lineOrder () const
{
    return static_cast <const LineOrderAttribute &>
    ((*this)["lineOrder"]).value();
}


Compression &
Header::compression ()
{
    return static_cast <CompressionAttribute &>
    ((*this)["compression"]).value();
}


const Compression &
Header::compression () const
{
    return static_cast <const CompressionAttribute &>
    ((*this)["compression"]).value();
}


void
Header::setTileDescription(const TileDescription& td)
{
    insert ("tiles", TileDescriptionAttribute (td));
}


bool
Header::hasTileDescription() const
{
    return findTypedAttribute <TileDescriptionAttribute> ("tiles") != 0;
}


TileDescription &
Header::tileDescription ()
{
    return typedAttribute <TileDescriptionAttribute> ("tiles").value();
}


const TileDescription &
Header::tileDescription () const
{
    return typedAttribute <TileDescriptionAttribute> ("tiles").value();
}

void
Header::setPreviewImage (const PreviewImage &pi)
{
    insert ("preview", PreviewImageAttribute (pi));
}


PreviewImage &
Header::previewImage ()
{
    return typedAttribute <PreviewImageAttribute> ("preview").value();
}


const PreviewImage &
Header::previewImage () const
{
    return typedAttribute <PreviewImageAttribute> ("preview").value();
}


bool
Header::hasPreviewImage () const
{
    return findTypedAttribute <PreviewImageAttribute> ("preview") != 0;
}


void
Header::sanityCheck (bool isTiled) const
{
    //
    // The display window and the data window must each
    // contain at least one pixel.  In addition, the
    // coordinates of the window corners must be small
    // enough to keep expressions like max-min+1 or
    // max+min from overflowing.
    //

    const Box2i &displayWindow = this->displayWindow();

    if (displayWindow.min.x > displayWindow.max.x ||
    displayWindow.min.y > displayWindow.max.y ||
    displayWindow.min.x <= -(INT_MAX / 2) ||
    displayWindow.min.y <= -(INT_MAX / 2) ||
    displayWindow.max.x >=  (INT_MAX / 2) ||
    displayWindow.max.y >=  (INT_MAX / 2))
    {
    throw Iex::ArgExc ("Invalid display window in image header.");
    }

    const Box2i &dataWindow = this->dataWindow();

    if (dataWindow.min.x > dataWindow.max.x ||
    dataWindow.min.y > dataWindow.max.y ||
    dataWindow.min.x <= -(INT_MAX / 2) ||
    dataWindow.min.y <= -(INT_MAX / 2) ||
    dataWindow.max.x >=  (INT_MAX / 2) ||
    dataWindow.max.y >=  (INT_MAX / 2))
    {
    throw Iex::ArgExc ("Invalid data window in image header.");
    }

    if (maxImageWidth > 0 &&
    maxImageWidth < dataWindow.max.x - dataWindow.min.x + 1)
    {
    THROW (Iex::ArgExc, "The width of the data window exceeds the "
                "maximum width of " << maxImageWidth << "pixels.");
    }

    if (maxImageHeight > 0 &&
    maxImageHeight < dataWindow.max.y - dataWindow.min.y + 1)
    {
    THROW (Iex::ArgExc, "The width of the data window exceeds the "
                "maximum width of " << maxImageHeight << "pixels.");
    }

    //
    // The pixel aspect ratio must be greater than 0.
    // In applications, numbers like the the display or
    // data window dimensions are likely to be multiplied
    // or divided by the pixel aspect ratio; to avoid
    // arithmetic exceptions, we limit the pixel aspect
    // ratio to a range that is smaller than theoretically
    // possible (real aspect ratios are likely to be close
    // to 1.0 anyway).
    //

    float pixelAspectRatio = this->pixelAspectRatio();

    const float MIN_PIXEL_ASPECT_RATIO = 1e-6f;
    const float MAX_PIXEL_ASPECT_RATIO = 1e+6f;

    if (pixelAspectRatio < MIN_PIXEL_ASPECT_RATIO ||
    pixelAspectRatio > MAX_PIXEL_ASPECT_RATIO)
    {
    throw Iex::ArgExc ("Invalid pixel aspect ratio in image header.");
    }

    //
    // The screen window width must not be less than 0.
    // The size of the screen window can vary over a wide
    // range (fish-eye lens to astronomical telescope),
    // so we can't limit the screen window width to a
    // small range.
    //

    float screenWindowWidth = this->screenWindowWidth();

    if (screenWindowWidth < 0)
    throw Iex::ArgExc ("Invalid screen window width in image header.");

    //
    // If the file is tiled, verify that the tile description has resonable
    // values and check to see if the lineOrder is one of the predefined 3.
    // If the file is not tiled, then the lineOrder can only be INCREASING_Y
    // or DECREASING_Y.
    //

    LineOrder lineOrder = this->lineOrder();

    if (isTiled)
    {
    if (!hasTileDescription())
    {
        throw Iex::ArgExc ("Tiled image has no tile "
                   "description attribute.");
    }

    const TileDescription &tileDesc = tileDescription();

    if (tileDesc.xSize <= 0 || tileDesc.ySize <= 0)
        throw Iex::ArgExc ("Invalid tile size in image header.");

    if (maxTileWidth > 0 &&
        maxTileWidth < tileDesc.xSize)
    {
        THROW (Iex::ArgExc, "The width of the tiles exceeds the maximum "
                "width of " << maxTileWidth << "pixels.");
    }

    if (maxTileHeight > 0 &&
        maxTileHeight < tileDesc.ySize)
    {
        THROW (Iex::ArgExc, "The width of the tiles exceeds the maximum "
                "width of " << maxTileHeight << "pixels.");
    }

    if (tileDesc.mode != ONE_LEVEL &&
        tileDesc.mode != MIPMAP_LEVELS &&
        tileDesc.mode != RIPMAP_LEVELS)
        throw Iex::ArgExc ("Invalid level mode in image header.");

    if (tileDesc.roundingMode != ROUND_UP &&
        tileDesc.roundingMode != ROUND_DOWN)
        throw Iex::ArgExc ("Invalid level rounding mode in image header.");

    if (lineOrder != INCREASING_Y &&
        lineOrder != DECREASING_Y &&
        lineOrder != RANDOM_Y)
        throw Iex::ArgExc ("Invalid line order in image header.");
    }
    else
    {
    if (lineOrder != INCREASING_Y &&
        lineOrder != DECREASING_Y)
        throw Iex::ArgExc ("Invalid line order in image header.");
    }

    //
    // The compression method must be one of the predefined values.
    //

    if (!isValidCompression (this->compression()))
    throw Iex::ArgExc ("Unknown compression type in image header.");

    //
    // Check the channel list:
    //
    // If the file is tiled then for each channel, the type must be one of the
    // predefined values, and the x and y sampling must both be 1.
    //
    // If the file is not tiled then for each channel, the type must be one
    // of the predefined values, the x and y coordinates of the data window's
    // upper left corner must be divisible by the x and y subsampling factors,
    // and the width and height of the data window must be divisible by the
    // x and y subsampling factors.
    //

    const ChannelList &channels = this->channels();

    if (isTiled)
    {
    for (ChannelList::ConstIterator i = channels.begin();
         i != channels.end();
         ++i)
    {
        if (i.channel().type != UINT &&
        i.channel().type != HALF &&
        i.channel().type != FLOAT)
        {
        THROW (Iex::ArgExc, "Pixel type of \"" << i.name() << "\" "
                        "image channel is invalid.");
        }

        if (i.channel().xSampling != 1)
        {
        THROW (Iex::ArgExc, "The x subsampling factor for the "
                    "\"" << i.name() << "\" channel "
                    "is not 1.");
        }

        if (i.channel().ySampling != 1)
        {
        THROW (Iex::ArgExc, "The y subsampling factor for the "
                    "\"" << i.name() << "\" channel "
                    "is not 1.");
        }
    }
    }
    else
    {
    for (ChannelList::ConstIterator i = channels.begin();
         i != channels.end();
         ++i)
    {
        if (i.channel().type != UINT &&
        i.channel().type != HALF &&
        i.channel().type != FLOAT)
        {
        THROW (Iex::ArgExc, "Pixel type of \"" << i.name() << "\" "
                        "image channel is invalid.");
        }

        if (i.channel().xSampling < 1)
        {
        THROW (Iex::ArgExc, "The x subsampling factor for the "
                    "\"" << i.name() << "\" channel "
                    "is invalid.");
        }

        if (i.channel().ySampling < 1)
        {
        THROW (Iex::ArgExc, "The y subsampling factor for the "
                    "\"" << i.name() << "\" channel "
                    "is invalid.");
        }

        if (dataWindow.min.x % i.channel().xSampling)
        {
        THROW (Iex::ArgExc, "The minimum x coordinate of the "
                    "image's data window is not a multiple "
                    "of the x subsampling factor of "
                    "the \"" << i.name() << "\" channel.");
        }

        if (dataWindow.min.y % i.channel().ySampling)
        {
        THROW (Iex::ArgExc, "The minimum y coordinate of the "
                    "image's data window is not a multiple "
                    "of the y subsampling factor of "
                    "the \"" << i.name() << "\" channel.");
        }

        if ((dataWindow.max.x - dataWindow.min.x + 1) %
            i.channel().xSampling)
        {
        THROW (Iex::ArgExc, "Number of pixels per row in the "
                    "image's data window is not a multiple "
                    "of the x subsampling factor of "
                    "the \"" << i.name() << "\" channel.");
        }

        if ((dataWindow.max.y - dataWindow.min.y + 1) %
            i.channel().ySampling)
        {
        THROW (Iex::ArgExc, "Number of pixels per column in the "
                    "image's data window is not a multiple "
                    "of the y subsampling factor of "
                    "the \"" << i.name() << "\" channel.");
        }
    }
    }
}


void
Header::setMaxImageSize (int maxWidth, int maxHeight)
{
    maxImageWidth = maxWidth;
    maxImageHeight = maxHeight;
}


void
Header::setMaxTileSize (int maxWidth, int maxHeight)
{
    maxTileWidth = maxWidth;
    maxTileHeight = maxHeight;
}


Int64
Header::writeTo (OStream &os, bool isTiled) const
{
    //
    // Write a "magic number" to identify the file as an image file.
    // Write the current file format version number.
    //

    Xdr::write <StreamIO> (os, MAGIC);

    int version = EXR_VERSION;

    if (isTiled)
        version |= TILED_FLAG;

    if (usesLongNames (*this))
        version |= LONG_NAMES_FLAG;

    Xdr::write <StreamIO> (os, version);

    //
    // Write all attributes.  If we have a preview image attribute,
    // keep track of its position in the file.
    //

    Int64 previewPosition = 0;

    const Attribute *preview =
        findTypedAttribute <PreviewImageAttribute> ("preview");

    for (ConstIterator i = begin(); i != end(); ++i)
    {
    //
    // Write the attribute's name and type.
    //

    Xdr::write <StreamIO> (os, i.name());
    Xdr::write <StreamIO> (os, i.attribute().typeName());

    //
    // Write the size of the attribute value,
    // and the value itself.
    //

    StdOSStream oss;
    i.attribute().writeValueTo (oss, version);

    std::string s = oss.str();
    Xdr::write <StreamIO> (os, (int) s.length());

    if (&i.attribute() == preview)
        previewPosition = os.tellp();

    os.write (s.data(), s.length());
    }

    //
    // Write zero-length attribute name to mark the end of the header.
    //

    Xdr::write <StreamIO> (os, "");

    return previewPosition;
}


void
Header::readFrom (IStream &is, int &version)
{
    //
    // Read the magic number and the file format version number.
    // Then check if we can read the rest of this file.
    //

    int magic;

    Xdr::read <StreamIO> (is, magic);
    Xdr::read <StreamIO> (is, version);

    if (magic != MAGIC)
    {
    throw Iex::InputExc ("File is not an image file.");
    }

    if (getVersion (version) != EXR_VERSION)
    {
    THROW (Iex::InputExc, "Cannot read "
                  "version " << getVersion (version) << " "
                  "image files.  Current file format version "
                  "is " << EXR_VERSION << ".");
    }

    if (!supportsFlags (getFlags (version)))
    {
    THROW (Iex::InputExc, "The file format version number's flag field "
                  "contains unrecognized flags.");
    }

    //
    // Read all attributes.
    //

    while (true)
    {
    //
    // Read the name of the attribute.
    // A zero-length attribute name indicates the end of the header.
    //

    char name[Name::SIZE];
    Xdr::read <StreamIO> (is, Name::MAX_LENGTH, name);

    if (name[0] == 0)
        break;

    checkIsNullTerminated (name, "attribute name");

    //
    // Read the attribute type and the size of the attribute value.
    //

    char typeName[Name::SIZE];
    int size;

    Xdr::read <StreamIO> (is, Name::MAX_LENGTH, typeName);
    checkIsNullTerminated (typeName, "attribute type name");
    Xdr::read <StreamIO> (is, size);

    AttributeMap::iterator i = _map.find (name);

    if (i != _map.end())
    {
        //
        // The attribute already exists (for example,
        // because it is a predefined attribute).
        // Read the attribute's new value from the file.
        //

        if (strncmp (i->second->typeName(), typeName, sizeof (typeName)))
        THROW (Iex::InputExc, "Unexpected type for image attribute "
                      "\"" << name << "\".");

        i->second->readValueFrom (is, size, version);
    }
    else
    {
        //
        // The new attribute does not exist yet.
        // If the attribute type is of a known type,
        // read the attribute value.  If the attribute
        // is of an unknown type, read its value and
        // store it as an OpaqueAttribute.
        //

        Attribute *attr;

        if (Attribute::knownType (typeName))
        attr = Attribute::newAttribute (typeName);
        else
        attr = new OpaqueAttribute (typeName);

        try
        {
        attr->readValueFrom (is, size, version);
        _map[name] = attr;
        }
        catch (...)
        {
        delete attr;
        throw;
        }
    }
    }
}


void
staticInitialize ()
{
    static Mutex criticalSection;
    Lock lock (criticalSection);

    static bool initialized = false;

    if (!initialized)
    {
    //
    // One-time initialization -- register
    // some predefined attribute types.
    //

    Box2fAttribute::registerAttributeType();
    Box2iAttribute::registerAttributeType();
    ChannelListAttribute::registerAttributeType();
    CompressionAttribute::registerAttributeType();
    ChromaticitiesAttribute::registerAttributeType();
    DoubleAttribute::registerAttributeType();
    EnvmapAttribute::registerAttributeType();
    FloatAttribute::registerAttributeType();
    IntAttribute::registerAttributeType();
    KeyCodeAttribute::registerAttributeType();
    LineOrderAttribute::registerAttributeType();
    M33dAttribute::registerAttributeType();
    M33fAttribute::registerAttributeType();
    M44dAttribute::registerAttributeType();
    M44fAttribute::registerAttributeType();
    PreviewImageAttribute::registerAttributeType();
    RationalAttribute::registerAttributeType();
    StringAttribute::registerAttributeType();
        StringVectorAttribute::registerAttributeType();
    TileDescriptionAttribute::registerAttributeType();
    TimeCodeAttribute::registerAttributeType();
    V2dAttribute::registerAttributeType();
    V2fAttribute::registerAttributeType();
    V2iAttribute::registerAttributeType();
    V3dAttribute::registerAttributeType();
    V3fAttribute::registerAttributeType();
    V3iAttribute::registerAttributeType();

    initialized = true;
    }
}


} // namespace Imf