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|---|---|---|---|
| 1 | #ifndef UTIL_BASE64_H | ||
| 2 | #define UTIL_BASE64_H | ||
| 3 | |||
| 4 | #include <stddef.h> | ||
| 5 | #include <stdint.h> | ||
| 6 | #include "macros.h" | ||
| 7 | |||
| 8 | extern const uint8_t base64_decode_table[256]; | ||
| 9 | extern const char base64_encode_table[64]; | ||
| 10 | |||
| 11 | enum { | ||
| 12 | BASE64_PADDING = 1 << 6, // Return value for padding bytes (=) | ||
| 13 | BASE64_INVALID = 1 << 7, // Return value for invalid bytes ([^A-Za-z0-9+/=]) | ||
| 14 | }; | ||
| 15 | |||
| 16 | // Decodes a single, base64 digit and returns a numerical value between 0-63, | ||
| 17 | // or one of the special enum values above | ||
| 18 | 13038 | static inline unsigned int base64_decode(unsigned char c) | |
| 19 | { | ||
| 20 | 13038 | return base64_decode_table[c]; | |
| 21 | } | ||
| 22 | |||
| 23 | // Like base64_decode(), but implemented in a way that's more amenable to | ||
| 24 | // constant propagation when `c` is known at compile-time | ||
| 25 | 256 | static inline unsigned int base64_decode_branchy(unsigned char c) | |
| 26 | { | ||
| 27 |
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256 | if (c >= 'A' && c <= 'Z') { |
| 28 | 26 | return c - 'A'; | |
| 29 | } | ||
| 30 |
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230 | if (c >= 'a' && c <= 'z') { |
| 31 | 26 | return (c - 'a') + 26; | |
| 32 | } | ||
| 33 |
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204 | if (c >= '0' && c <= '9') { |
| 34 | 10 | return (c - '0') + 52; | |
| 35 | } | ||
| 36 |
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194 | if (c == '+') { |
| 37 | return 62; | ||
| 38 | } | ||
| 39 |
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193 | if (c == '/') { |
| 40 | return 63; | ||
| 41 | } | ||
| 42 |
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192 | if (c == '=') { |
| 43 | 1 | return BASE64_PADDING; | |
| 44 | } | ||
| 45 | return BASE64_INVALID; | ||
| 46 | } | ||
| 47 | |||
| 48 | size_t base64_encode_block(const char *in, size_t ilen, char *out, size_t olen) NONNULL_ARGS; | ||
| 49 | void base64_encode_final(const char *in, size_t ilen, char out[4]) NONNULL_ARGS; | ||
| 50 | |||
| 51 | #endif | ||
| 52 |