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/usr/include/lighttpd/base64.h is in lighttpd-dev 1.4.45-1ubuntu3.

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#ifndef _BASE64_H_
#define _BASE64_H_
#include "first.h"

#include "buffer.h"

typedef enum {
	BASE64_STANDARD,
	BASE64_URL,
} base64_charset;

unsigned char* buffer_append_base64_decode(buffer *out, const char* in, size_t in_length, base64_charset charset);

size_t li_to_base64_no_padding(char* out, size_t out_length, const unsigned char* in, size_t in_length, base64_charset charset);
size_t li_to_base64(char* out, size_t out_length, const unsigned char* in, size_t in_length, base64_charset charset);

char* buffer_append_base64_encode_no_padding(buffer *out, const unsigned char* in, size_t in_length, base64_charset charset);
char* buffer_append_base64_encode(buffer *out, const unsigned char* in, size_t in_length, base64_charset charset);

#endif