mirror of git://git.suckless.org/sbase
134 lines
2.9 KiB
C
134 lines
2.9 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/stat.h>
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#include <stdio.h>
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#include "util.h"
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static int mflag = 0;
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static unsigned int
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b64e(unsigned char b[2])
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{
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unsigned int o = 0;
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unsigned int p = b[2] | (b[1] << 8) | (b[0] << 16);
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const char b64et[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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o = b64et[p & 0x3f]; p >>= 6;
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o = (o << 8) | b64et[p & 0x3f]; p >>= 6;
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o = (o << 8) | b64et[p & 0x3f]; p >>= 6;
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o = (o << 8) | b64et[p & 0x3f];
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return o;
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}
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static void
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uuencodeb64(FILE *fp, const char *name, const char *s)
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{
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struct stat st;
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ssize_t n, m = 0;
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unsigned char buf[45], *pb;
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unsigned int out[sizeof(buf)/3 + 1], *po;
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if (fstat(fileno(fp), &st) < 0)
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eprintf("fstat %s:", s);
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printf("begin-base64 %o %s\n", st.st_mode & 0777, name);
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/* write line by line */
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while ((n = fread(buf, 1, sizeof(buf), fp))) {
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/* clear old buffer if converting with non-multiple of 3 */
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if (n != sizeof(buf) && (m = n % 3) != 0) {
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buf[n] = '\0'; /* m == 2 */
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if (m == 1) buf[n+1] = '\0'; /* m == 1 */
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}
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for (pb = buf, po = out; pb < buf + n; pb += 3)
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*po++ = b64e(pb);
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if (m != 0) {
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unsigned int mask = 0xffffffff, dest = 0x3d3d3d3d;
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/* m==2 -> 0x00ffffff; m==1 -> 0x0000ffff */
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mask >>= ((3-m) << 3);
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po[-1] = (po[-1] & mask) | (dest & ~mask);
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}
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*po++ = '\n';
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fwrite(out, 1, (po - out) * sizeof(unsigned int) - 3, stdout);
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}
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if (ferror(fp))
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eprintf("'%s' read error:", s);
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puts("====");
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}
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static void
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uuencode(FILE *fp, const char *name, const char *s)
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{
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struct stat st;
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unsigned char buf[45], *p;
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ssize_t n;
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int ch;
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if (fstat(fileno(fp), &st) < 0)
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eprintf("fstat %s:", s);
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printf("begin %o %s\n", st.st_mode & 0777, name);
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while ((n = fread(buf, 1, sizeof(buf), fp))) {
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ch = ' ' + (n & 0x3f);
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putchar(ch == ' ' ? '`' : ch);
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for (p = buf; n > 0; n -= 3, p += 3) {
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if (n < 3) {
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p[2] = '\0';
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if (n < 2)
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p[1] = '\0';
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}
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ch = ' ' + ((p[0] >> 2) & 0x3f);
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putchar(ch == ' ' ? '`' : ch);
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ch = ' ' + (((p[0] << 4) | ((p[1] >> 4) & 0xf)) & 0x3f);
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putchar(ch == ' ' ? '`' : ch);
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ch = ' ' + (((p[1] << 2) | ((p[2] >> 6) & 0x3)) & 0x3f);
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putchar(ch == ' ' ? '`' : ch);
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ch = ' ' + (p[2] & 0x3f);
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putchar(ch == ' ' ? '`' : ch);
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}
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putchar('\n');
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}
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if (ferror(fp))
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eprintf("'%s' read error:", s);
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printf("%c\nend\n", '`');
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}
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static void
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usage(void)
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{
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eprintf("usage: %s [-m] [file] name\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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ARGBEGIN {
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case 'm':
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mflag = 1;
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break;
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default:
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usage();
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} ARGEND;
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if (!argc || argc > 2)
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usage();
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if (argc == 1) {
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if (mflag)
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uuencodeb64(stdin, argv[0], "<stdin>");
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else
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uuencode(stdin, argv[0], "<stdin>");
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} else {
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if (!(fp = fopen(argv[0], "r")))
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eprintf("fopen %s:", argv[0]);
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if (mflag)
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uuencodeb64(fp, argv[1], argv[0]);
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else
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uuencode(fp, argv[1], argv[0]);
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fclose(fp);
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}
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return 0;
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}
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