libwget-base64(3) Introduction to Library Functions libwget-base64(3)

NAME

libwget-base64 - Base64 functions

SYNOPSIS

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
bool wget_base64_is_string (const char * src)
Parameters
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.

size_t wget_base64_decode (char * dst, const char * src, size_t n)
Parameters
dst Output buffer
src Base64 string to be decoded
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.

char * wget_base64_decode_alloc (const char * src, size_t n, size_t *
outlen)
Parameters
src Base64 string to be decoded
n Length of src
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.

size_t wget_base64_encode (char * dst, const char * src, size_t n)
Parameters
dst Base64 output string
src Input buffer
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.

size_t wget_base64_urlencode (char * dst, const char * src, size_t n)
Parameters
dst Base64 output string (URL and filename safe)
src Input buffer
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.

char * wget_base64_encode_alloc (const char * src, size_t n)
Parameters
src Input buffer
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.

char * wget_base64_encode_vprintf_alloc (const char * fmt, va_list args)
Parameters
fmt Printf-like format string
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.

char * wget_base64_encode_printf_alloc (const char * fmt, ...)
Parameters
fmt Printf-like format string
... 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.

static inline size_t wget_base64_get_decoded_length (size_t len)
Parameters
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.

static inline size_t wget_base64_get_encoded_length (size_t len)
Parameters
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.

Author
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wget2 Version 2.2.0 libwget-base64(3)