Base64 functions

Macros
#define	WGET_BASE64_URLENCODE   1

Functions
bool	wget_base64_is_string (const char *src)
size_t	wget_base64_decode (char *dst, const char *src, size_t n)
char *	wget_base64_decode_alloc (const char *src, size_t n, size_t *outlen)
size_t	wget_base64_encode (char *dst, const char *src, size_t n)
size_t	wget_base64_urlencode (char *dst, const char *src, size_t n)
char *	wget_base64_encode_alloc (const char *src, size_t n)
char *	wget_base64_encode_vprintf_alloc (const char *fmt, va_list args)
char *	wget_base64_encode_printf_alloc (const char *fmt,...)
size_t	wget_base64_get_decoded_length (size_t len)
size_t	wget_base64_get_encoded_length (size_t len)

Detailed Description

This is a collection base64 encoding/decoding functions used in Wget2.

Function Documentation

wget_base64_is_string()

bool wget_base64_is_string

(

const char *

src

)

Parameters

[in]

src

String to be checked

Returns

1 if src is a base64 string, 0 otherwise

Checks whether src is a base64 string. Returns 0 if src is NULL.

wget_base64_decode()

size_t wget_base64_decode	(	char *	dst,
		const char *	src,
		size_t	n )

Parameters

[out]	dst	Output buffer
[in]	src	Base64 string to be decoded
[in]	n	Length of src

Returns

Number of bytes written into dst

Decodes n bytes of the base64 string src. The decoded bytes are written into dst and are 0-terminated.

The size of dst has to be at minimum ((n + 3) / 4) * 3 + 1 bytes.

wget_base64_decode_alloc()

char * wget_base64_decode_alloc	(	const char *	src,
		size_t	n,
		size_t *	outlen )

Parameters

[in]	src	Base64 string to be decoded
[in]	n	Length of src
[out]	outlen	Length of returned string, may be NULL.

Returns

Decoded bytes, zero terminated. Returns NULL if memory allocation failed.

Decodes n bytes of the base64 string src. The decoded bytes are returned in an allocated buffer.

You should free() the returned string when not needed any more.

wget_base64_encode()

size_t wget_base64_encode	(	char *	dst,
		const char *	src,
		size_t	n )

Parameters

[out]	dst	Base64 output string
[in]	src	Input buffer
[in]	n	Number of bytes to be encoded

Returns

Length of output string dst

Encodes n bytes from src into a base64 string. The encoded string is written into dst (0-terminated).

The length of dst has to be at minimum ((n + 2) / 3) * 4 + 1 bytes.

wget_base64_urlencode()

size_t wget_base64_urlencode	(	char *	dst,
		const char *	src,
		size_t	n )

Parameters

[out]	dst	Base64 output string (URL and filename safe)
[in]	src	Input buffer
[in]	n	Number of bytes to be encoded

Returns

Length of output string dst

Encodes n bytes from src into a base64 URL and filename safe string (see RFC 4648, 5.). The encoded string is written into dst (0-terminated).

The length of dst has to be at minimum ((n + 2) / 3) * 4 + 1 bytes.

wget_base64_encode_alloc()

char * wget_base64_encode_alloc	(	const char *	src,
		size_t	n )

Parameters

[in]	src	Input buffer
[in]	n	Number of bytes to be encoded

Returns

Base64 encoded string or NULL if memory allocation failed

Encodes n bytes from input buffer src. The encoded string is returned in an allocated buffer.

You should free() the returned string when not needed any more.

wget_base64_encode_vprintf_alloc()

char * wget_base64_encode_vprintf_alloc	(	const char *	fmt,
		va_list	args )

Parameters

[in]	fmt	Printf-like format string
[in]	args	Argument list

Returns

Base64 encoded string

Encodes the string constructed by fmt and args. The encoded string is returned in an allocated buffer.

You should free() the returned string when not needed any more.

wget_base64_encode_printf_alloc()

char * wget_base64_encode_printf_alloc	(	const char *	fmt,
			... )

Parameters

[in]	fmt	Printf-like format string
[in]	...	Argument list

Returns

Base64 encoded string

Encodes the string constructed by fmt and the arguments. The encoded string is returned in an allocated buffer.

You should free() the returned string when not needed any more.

wget_base64_get_decoded_length()

size_t wget_base64_get_decoded_length

(

size_t

len

)

Parameters

[in]

len

Length of base64 sequence

Returns

Number of decoded bytes plus one (for 0-byte termination)

Calculate the number of bytes needed for decoding a base64 sequence with length len.

wget_base64_get_encoded_length()

size_t wget_base64_get_encoded_length

(

size_t

len

)

Parameters

[in]

len

Number of (un-encoded) bytes

Returns

Length of base64 encoding plus one (for 0-byte termination)

Calculate the number of bytes needed for base64 encoding a byte sequence with length len, including the padding and 0-termination bytes.