/ * public domain */ /* * arbitrary data on stdin -> BASE64 data on stdout * * UNIX's newline convention is used, i.e. one ASCII control-j (10 decimal). */ #include <stdio.h> unsigned char alphabet[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; int main() { int cols, bits, c, char_count; char_count = 0; bits = 0; cols = 0; while ((c = getchar()) != EOF) { if (c > 255) { fprintf(stderr, "encountered char > 255 (decimal %d)", c); exit(1); } bits += c; char_count++; if (char_count == 3) { putchar(alphabet[bits >> 18]); putchar(alphabet[(bits >> 12) & 0x3f]); putchar(alphabet[(bits >> 6) & 0x3f]); putchar(alphabet[bits & 0x3f]); cols += 4; if (cols == 72) { putchar('\n'); cols = 0; } bits = 0; char_count = 0; } else { bits <<= 8; } } if (char_count != 0) { bits <<= 16 - (8 * char_count); putchar(alphabet[bits >> 18]); putchar(alphabet[(bits >> 12) & 0x3f]); if (char_count == 1) { putchar('='); putchar('='); } else { putchar(alphabet[(bits >> 6) & 0x3f]); putchar('='); } if (cols > 0) putchar('\n'); } exit(0); }
file: /Techref/method/codec/base64-encode.txt, 1KB, , updated: 1999/12/21 10:55, local time: 2024/11/8 15:59,
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