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ImageSize Class Reference

#include <image_size.h>

List of all members.

Public Types
enum	Type {   UNKNOWN = -1, GIF = 1, JPEG = 2, PNG = 3,   BMP = 4 }
enum	Error {   SUCCESS = 0, INVALID_FILE = 1, INVALID_FILE_NAME = 2, INVALID_FILE_TYPE = 3,   BAD_HEADER = 4, BAD_IMAGE = 5 }
	if the image is not valid these errors are saying why. More...
Public Methods
	ImageSize (std::string file_name)
bool	operator! () const
bool	is_valid () const
unsigned int	get_width () const
unsigned int	get_height () const
Type	get_type () const
	returns the type of the image. More...
Error	get_error () const
	more detailed description why an error occured. More...
Private Methods
	ImageSize ()
bool	get_image_type ()
	detects the image type out of the file_name extension. More...
bool	compare (std::string a, std::string b)
	uncasesesitiv string compare. More...
bool	get_1_byte (unsigned int &byte)
bool	get_le_2_bytes (unsigned int &bytes)
	2 bytes, littel endian. More...
bool	get_be_2_bytes (unsigned int &bytes)
	2 bytes, big endian. More...
bool	get_le_4_bytes (unsigned int &bytes)
	4 bytes, littel endian. More...
bool	get_be_4_bytes (unsigned int &bytes)
	4 bytes, big endian. More...
bool	jump_abs (unsigned int pos)
	absolut seeking in file. More...
bool	jump_rel (unsigned int n)
	relative seeking in file. More...
bool	get_string (std::string &s, unsigned int n)
	reads n bytes from the file and stores them as a string in s. More...
void	get_gif_geometry ()
bool	check_gif_signature ()
void	get_jpeg_geometry ()
bool	check_jpeg_signature ()
bool	jpeg_find_sof0_marker ()
void	get_png_geometry ()
bool	check_png_signature ()
void	get_bmp_geometry ()
bool	check_bmp_signature ()
Private Attributes
bool	valid
unsigned int	width
unsigned int	height
std::ifstream	in
Type	type
std::string	file_name
Error	error

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Member Enumeration Documentation

enum ImageSize::Error

if the image is not valid these errors are saying why. Enumeration values: SUCCESS  no Error. INVALID_FILE  couldn't open the file. INVALID_FILE_NAME  eg.: file name without an extension. INVALID_FILE_TYPE  unsuported file type. BAD_HEADER  probably damaged image header. BAD_IMAGE  probably damaged image.

enum ImageSize::Type

Enumeration values: UNKNOWN  GIF  JPEG  PNG  BMP

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Constructor & Destructor Documentation

ImageSize::ImageSize (  std::string    file_name )

ImageSize::ImageSize (    )  [inline, private]

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Member Function Documentation

bool ImageSize::check_bmp_signature (    )  [private]

bool ImageSize::check_gif_signature (    )  [private]

bool ImageSize::check_jpeg_signature (    )  [private]

bool ImageSize::check_png_signature (    )  [private]

bool ImageSize::compare (  std::string    a, std::string    b )  [private]

uncasesesitiv string compare. string a will be converted to upper case, string b won't be touched

bool ImageSize::get_1_byte (  unsigned int &    byte )  [private]

bool ImageSize::get_be_2_bytes (  unsigned int &    bytes )  [private]

2 bytes, big endian.

bool ImageSize::get_be_4_bytes (  unsigned int &    bytes )  [private]

4 bytes, big endian.

void ImageSize::get_bmp_geometry (    )  [private]

Error ImageSize::get_error (    )  const [inline]

more detailed description why an error occured.

void ImageSize::get_gif_geometry (    )  [private]

unsigned int ImageSize::get_height (    )  const [inline]

bool ImageSize::get_image_type (    )  [private]

detects the image type out of the file_name extension.

void ImageSize::get_jpeg_geometry (    )  [private]

bool ImageSize::get_le_2_bytes (  unsigned int &    bytes )  [private]

2 bytes, littel endian.

bool ImageSize::get_le_4_bytes (  unsigned int &    bytes )  [private]

4 bytes, littel endian.

void ImageSize::get_png_geometry (    )  [private]

bool ImageSize::get_string (  std::string &    s, unsigned int    n )  [private]

reads n bytes from the file and stores them as a string in s.

Type ImageSize::get_type (    )  const [inline]

returns the type of the image.

unsigned int ImageSize::get_width (    )  const [inline]

bool ImageSize::is_valid (    )  const [inline]

bool ImageSize::jpeg_find_sof0_marker (    )  [private]

bool ImageSize::jump_abs (  unsigned int    pos )  [private]

absolut seeking in file.

bool ImageSize::jump_rel (  unsigned int    n )  [private]

relative seeking in file.

bool ImageSize::operator! (    )  const [inline]

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Member Data Documentation

Error ImageSize::error [private]

std::string ImageSize::file_name [private]

unsigned int ImageSize::height [private]

std::ifstream ImageSize::in [private]

Type ImageSize::type [private]

bool ImageSize::valid [private]

unsigned int ImageSize::width [private]

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

• image_size.h
• image_size.cpp

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