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9b1fe95a8e
7 changed files with 234 additions and 0 deletions
2
.gitignore
vendored
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2
.gitignore
vendored
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b64
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*.o
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13
Makefile
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13
Makefile
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CFLAGS = -g -Wall -Wextra -Werror
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objects = main.o input.o trans.o
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b64 : $(objects)
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cc -o b64 $(objects)
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main.o trans.o input.o : input.h
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main.o trans.o : trans.h
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.PHONY : clean
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clean :
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rm -f b64 $(objects)
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37
input.c
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37
input.c
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#include "input.h"
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#define OBUFSIZE 4
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#define SBUFSIZE 5
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#define PADDING '='
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unsigned char o[OBUFSIZE];
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unsigned char s[SBUFSIZE];
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unsigned char *
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getocts(FILE *fp, int *np)
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{
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int n, c;
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n = 0;
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while (n < OBUFSIZE-1 && (c = fgetc(fp)) != EOF)
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o[n++] = c;
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*np = n;
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return (*np) ? o : NULL;
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}
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unsigned char *
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getsxts(FILE *fp, int *np)
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{
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int n, p, c;
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n = p = 0;
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while (n < SBUFSIZE-1 && (c = fgetc(fp)) != EOF && c != PADDING)
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s[n++] = c;
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while (n+p < SBUFSIZE-1)
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s[n+p++] = PADDING;
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*np = n;
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return (n) ? s : NULL;
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}
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15
input.h
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15
input.h
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#ifndef HEADER_INPUT
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#define HEADER_INPUT
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#include <stdio.h>
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extern unsigned char o[];
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extern unsigned char s[];
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unsigned char *
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getocts(FILE *fp, int *np);
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unsigned char *
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getsxts(FILE *fp, int *np);
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#endif
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58
main.c
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58
main.c
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#include <stdio.h>
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#include <stdlib.h>
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#include "input.h"
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#include "trans.h"
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int
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main(int argc, char *argv[])
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{
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int c, n, dec, hlp;
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char *prog = *argv;
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unsigned char *b;
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FILE *fp;
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dec = hlp = 0;
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while (--argc > 0 && (*++argv)[0] == '-')
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while ((c = *++argv[0]))
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switch (c) {
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case 'd':
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dec = 1;
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break;
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case 'h':
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hlp = 1;
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break;
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default:
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fprintf(stderr, "%s: illegal option %c\n", prog, c);
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exit(EXIT_FAILURE);
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break;
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}
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if (hlp) {
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fprintf(stdout, "Usage: %s -d -h file\n", prog);
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} else if (argc != 1) {
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if (dec) {
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while ((b = getsxts(stdin, &n))) {
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b = decode(b, &n);
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fwrite(b, sizeof(*b), n, stdout);
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}
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} else {
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while ((b = getocts(stdin, &n)))
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printf("%s", encode(b, n));
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}
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} else {
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if ((fp = fopen(*argv, "r")) == NULL) {
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fprintf(stderr, "%s: can't open %s\n", prog, *argv);
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exit(EXIT_FAILURE);
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}
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else if (dec) {
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while ((b = getsxts(fp, &n))) {
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b = decode(b, &n);
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fwrite(b, sizeof(*b), n, stdout);
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}
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} else {
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while ((b = getocts(fp, &n)))
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printf("%s", encode(b, n));
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}
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fclose(fp);
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}
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exit(EXIT_SUCCESS);
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}
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97
trans.c
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97
trans.c
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#include "trans.h"
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#define PADDING '='
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unsigned char b64[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
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"abcdefghijklmnopqrstuvwxyz" \
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"0123456789" \
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"+/";
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unsigned char *
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encode(unsigned char *op, int np)
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{
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extern unsigned char s[];
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unsigned char *sp;
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int n;
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sp = s;
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switch (np) {
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case 3:
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*sp++ = b64[(*op & ~3) >> 2];
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n = (*op++ & 3) << 4;
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*sp++ = b64[n + ((*op & ~15) >> 4)];
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n = (*op++ & 15) << 2;
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*sp++ = b64[n + ((*op & 192) >> 6)];
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*sp = b64[*op & ~192];
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break;
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case 2:
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*sp++ = b64[(*op & ~3) >> 2];
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n = (*op++ & 3) << 4;
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*sp++ = b64[n + ((*op & ~15) >> 4)];
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*sp++ = b64[(*op & 15) << 2];
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*sp = PADDING;
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break;
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case 1:
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*sp++ = b64[(*op & ~3) >> 2];
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*sp++ = b64[(*op & 3) << 4];
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*sp++ = PADDING;
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*sp = PADDING;
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break;
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}
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return s;
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}
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unsigned char *
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decode(unsigned char *sp, int *np)
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{
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extern unsigned char o[];
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unsigned char *op;
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int n, b, atob(int c);
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op = o;
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switch (*np) {
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case 4:
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n = atob(*sp++) << 2;
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b = atob(*sp++);
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*op++ = n + ((b & ~15) >> 4);
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n = (b & 15) << 4;
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b = atob(*sp++);
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*op++ = n + ((b & ~3) >> 2);
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*op = ((b & 3) << 6) + atob(*sp);
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break;
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case 3:
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n = atob(*sp++) << 2;
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b = atob(*sp++);
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*op++ = n + ((b & ~15) >> 4);
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n = (b & 15) << 4;
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*op = n + ((atob(*sp) & ~3) >> 2);
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break;
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case 2:
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n = atob(*sp++) << 2;
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*op = n + ((atob(*sp) & ~15) >> 4);
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break;
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}
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*np = op-o+1;
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return o;
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}
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int atob(int c)
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{
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if (c >= 'A' && c <= 'Z')
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c -= 'A';
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else if (c >= 'a' && c <= 'z')
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c = c - 'a' + 26;
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else if (c >= '0' && c <= '9')
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c = c - '0' + 26 * 2;
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else if (c == '+')
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c = 62;
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else
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c = 63;
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return c;
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}
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12
trans.h
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12
trans.h
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#ifndef HEADER_TRANS
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#define HEADER_TRANS
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#include "input.h"
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unsigned char *
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encode(unsigned char *op, int np);
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unsigned char *
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decode(unsigned char *sp, int *np);
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#endif
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