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# Exiv2::CiffHeader Class Reference

This class models the header of a Crw (Canon Raw data) image. It is the head of a CIFF parse tree, consisting of CiffDirectory and CiffEntry objects. Most of its methods will walk the parse tree to perform the requested action. More...

`#include <crwimage.hpp>`

Collaboration diagram for Exiv2::CiffHeader:

[legend]
List of all members.

## Public Types
typedef std::auto_ptr< CiffHeader > | AutoPtr
| CiffHeader auto_ptr type.
## Public Member Functions
Creators
| CiffHeader ()
| Default constructor.
virtual | ~CiffHeader ()
| Virtual destructor.
Manipulators
void | read (const byte *pData, uint32_t size)
| Read the Crw image from a data buffer, starting with the Ciff header.
void | add (uint16_t crwTagId, uint16_t crwDir, DataBuf buf)
| Set the value of entry crwTagId in directory crwDir to buf. If this tag doesn't exist, it is added along with all directories needed.
void | remove (uint16_t crwTagId, uint16_t crwDir)
| Remove entry crwTagId in directory crwDir from the parse tree. If it's the last entry in the directory, the directory is removed as well, etc.
Accessors
void | write (Blob &blob) const
| Write the Crw image to the binary image blob, starting with the Ciff header. This method appends to the blob.
void | decode (Image &image) const
| Decode the Crw image and add it to image.
void | print (std::ostream &os, const std::string &prefix="") const
| Print debug info for the Crw image to os.
ByteOrder | byteOrder () const
| Return the byte order (little or big endian).
CiffComponent * | findComponent (uint16_t crwTagId, uint16_t crwDir) const
| Finds crwTagId in directory crwDir, returning a pointer to the component or 0 if not found.
## Static Public Member Functions
static const char * | signature ()
| Return a pointer to the Canon Crw signature.

## Detailed Description

This class models the header of a Crw (Canon Raw data) image. It is the head of a CIFF parse tree, consisting of CiffDirectory and CiffEntry objects. Most of its methods will walk the parse tree to perform the requested action.

## Member Function Documentation

void Exiv2::CiffHeader::add | ( | uint16_t | crwTagId,
|  | uint16_t | crwDir,
|  | DataBuf | buf
| ) |

  | Set the value of entry crwTagId in directory crwDir to buf. If this tag doesn't exist, it is added along with all directories needed. Parameters:
  | crwTagId | Tag to be added.
  | crwDir | Parent directory of the tag.
  | buf | Value to be set.

void Exiv2::CiffHeader::decode | ( | Image & | image | ) | const

  | Decode the Crw image and add it to image. Walk the parse tree and convert CIFF entries to metadata entries which are added to image. Parameters:
  | image | Image to add metadata to

void Exiv2::CiffHeader::print | ( | std::ostream & | os,
|  | const std::string & | prefix = `""`
| ) | const

  | Print debug info for the Crw image to os. Parameters:
  | os | Output stream to write to.
  | prefix | Prefix to be written before each line of output.

void Exiv2::CiffHeader::read | ( | const byte * | pData,
|  | uint32_t | size
| ) |

  | Read the Crw image from a data buffer, starting with the Ciff header. Parameters:
  | pData | Pointer to the data buffer.
  | size | Number of bytes in the data buffer.
  Exceptions:
  | Error | If the image cannot be parsed.

void Exiv2::CiffHeader::remove | ( | uint16_t | crwTagId,
|  | uint16_t | crwDir
| ) |

  | Remove entry crwTagId in directory crwDir from the parse tree. If it's the last entry in the directory, the directory is removed as well, etc. Parameters:
  | crwTagId | Tag id to be removed.
  | crwDir | Parent directory of the tag.

void Exiv2::CiffHeader::write | ( | Blob & | blob | ) | const

  | Write the Crw image to the binary image blob, starting with the Ciff header. This method appends to the blob. Parameters:
  | blob | Binary image to add to.
  Exceptions:
  | Error | If the image cannot be written.

The documentation for this class was generated from the following files:

- crwimage.hpp
- crwimage.cpp