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static inline void enc_loop_generic_32_inner (const uint8_t **s, uint8_t **o) { uint32_t src; // Load input: memcpy(&src, *s, sizeof (src)); // Reorder to 32-bit big-endian, if not already in that format. The // workset must be in big-endian, otherwise the shifted bits do not // carry over properly among adjacent bytes: src = BASE64_HTOBE32(src); // Two indices for the 12-bit lookup table: const size_t index0 = (src >> 20) & 0xFFFU; const size_t index1 = (src >> 8) & 0xFFFU; // Table lookup and store: memcpy(*o + 0, base64_table_enc_12bit + index0, 2); memcpy(*o + 2, base64_table_enc_12bit + index1, 2); *s += 3; *o += 4; } static inline void enc_loop_generic_32 (const uint8_t **s, size_t *slen, uint8_t **o, size_t *olen) { if (*slen < 4) { return; } // Process blocks of 3 bytes at a time. Because blocks are loaded 4 // bytes at a time, ensure that there will be at least one remaining // byte after the last round, so that the final read will not pass // beyond the bounds of the input buffer: size_t rounds = (*slen - 1) / 3; *slen -= rounds * 3; // 3 bytes consumed per round *olen += rounds * 4; // 4 bytes produced per round do { if (rounds >= 8) { enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); rounds -= 8; continue; } if (rounds >= 4) { enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); rounds -= 4; continue; } if (rounds >= 2) { enc_loop_generic_32_inner(s, o); enc_loop_generic_32_inner(s, o); rounds -= 2; continue; } enc_loop_generic_32_inner(s, o); break; } while (rounds > 0); }