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uuencode: add support for base64 and -o to stdout

This commit is contained in:
Tai Chi Minh Ralph Eastwood 2015-02-10 19:14:27 +00:00 committed by sin
parent 93d0178852
commit ec02816d3e
2 changed files with 175 additions and 23 deletions
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132
uudecode.c
View File

@ -11,26 +11,38 @@
#include "text.h"
#include "util.h"
static void uudecodeb64(FILE *, FILE *);
static void uudecode(FILE *, FILE *);
static void parseheader(FILE *, const char *, const char *, mode_t *, char **);
static void parseheader(FILE *, const char *, char **, mode_t *, char **);
static FILE *parsefile(const char *);
static void
usage(void)
{
eprintf("usage: %s [file]\n", argv0);
eprintf("usage: %s [-m] [-o output] [file]\n", argv0);
}
static int mflag = 0;
static int oflag = 0;
int
main(int argc, char *argv[])
{
FILE *fp = NULL, *nfp = NULL;
char *fname;
char *fname, *header;
const char *ifname;
mode_t mode = 0;
void (*d) (FILE *, FILE *) = NULL;
char *ofname = NULL;
ARGBEGIN {
case 'm':
eprintf("-m not implemented\n");
mflag = 1; /* accepted but unused (autodetect file type) */
break;
case 'o':
oflag = 1;
ofname = EARGF(usage());
break;
default:
usage();
} ARGEND;
@ -39,20 +51,31 @@ main(int argc, char *argv[])
usage();
if (argc == 0) {
parseheader(stdin, "<stdin>", "begin ", &mode, &fname);
if (!(nfp = parsefile(fname)))
eprintf("fopen %s:", fname);
uudecode(stdin, nfp);
fp = stdin;
ifname = "<stdin>";
} else {
if (!(fp = fopen(argv[0], "r")))
eprintf("fopen %s:", argv[0]);
parseheader(fp, argv[0], "begin ", &mode, &fname);
if (!(nfp = parsefile(fname)))
eprintf("fopen %s:", fname);
uudecode(fp, nfp);
ifname = argv[0];
}
if (chmod(fname, mode) < 0)
parseheader(fp, ifname, &header, &mode, &fname);
if (!strncmp(header, "begin", sizeof("begin")))
d = uudecode;
else if (!strncmp(header, "begin-base64", sizeof("begin-base64")))
d = uudecodeb64;
else
eprintf("unknown header %s:", header);
if (oflag)
fname = ofname;
if (!(nfp = parsefile(fname)))
eprintf("fopen %s:", fname);
d(fp, nfp);
if (nfp != stdout && chmod(fname, mode) < 0)
eprintf("chmod %s:", fname);
if (fp)
fclose(fp);
@ -68,7 +91,7 @@ parsefile(const char *fname)
struct stat st;
int ret;
if (strcmp(fname, "/dev/stdout") == 0)
if (strcmp(fname, "/dev/stdout") == 0 || strcmp(fname, "-") == 0)
return stdout;
ret = lstat(fname, &st);
/* if it is a new file, try to open it */
@ -87,9 +110,10 @@ tropen:
}
static void
parseheader(FILE *fp, const char *s, const char *header, mode_t *mode, char **fname)
parseheader(FILE *fp, const char *s, char **header, mode_t *mode,
char **fname)
{
char bufs[PATH_MAX + 11]; /* len header + mode + maxname */
char bufs[PATH_MAX + 18]; /* len header + mode + maxname */
char *p, *q;
size_t n;
@ -101,9 +125,12 @@ parseheader(FILE *fp, const char *s, const char *header, mode_t *mode, char **fn
if (!(p = strchr(bufs, '\n')))
eprintf("header string too long or non-newline terminated file\n");
p = bufs;
if (strncmp(bufs, header, strlen(header)) != 0)
eprintf("malformed header prefix\n");
p += strlen(header);
if (!(q = strchr(p, ' ')))
eprintf("malformed mode string in header\n");
*header = bufs;
*q++ = '\0';
p = q;
/* now header should be null terminated, q points to mode */
if (!(q = strchr(p, ' ')))
eprintf("malformed mode string in header\n");
*q++ = '\0';
@ -115,6 +142,73 @@ parseheader(FILE *fp, const char *s, const char *header, mode_t *mode, char **fn
if (n > 0)
*fname = q;
}
static const char b64dt[] = {
-1,-1,-1,-1,-1,-1,-1,-1,-1,-2,-2,-2,-2,-2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-2,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,62,-1,-1,-1,63,
52,53,54,55,56,57,58,59,60,61,-1,-1,-1,0,-1,-1,-1,0,1,2,3,4,5,6,
7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,-1,-1,-1,-1,-1,
-1,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,
49,50,51,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,
};
static void
uudecodeb64(FILE *fp, FILE *outfp)
{
char bufb[60], *pb;
char out[45], *po;
size_t n;
int b = 0, e, t = 0;
unsigned char b24[3] = {0, 0, 0};
while ((n = fread(bufb, 1, sizeof(bufb), fp))) {
for (pb = bufb, po = out; pb < bufb + n; pb++) {
if (*pb == '=') {
if (b == 0 || t) {
/* footer size is ==== is 4 */
if (++t < 4)
continue;
else
return;
} else if (b == 1) {
eprintf("unexpected \"=\" appeared.");
} else if (b == 2) {
*po++ = b24[0];
fwrite(out, 1, (po - out), outfp);
} else if (b == 3) {
*po++ = b24[0];
*po++ = b24[1];
fwrite(out, 1, (po - out), outfp);
}
}
if ((e = b64dt[(int)*pb]) == -1) {
eprintf("invalid byte \"%c\"", *pb);
} else if (e == -2) /* whitespace */
continue;
switch (b) {
case 0: b24[0] |= e << 2; break;
case 1: b24[0] |= (e >> 4) & 0x3;
b24[1] |= (e & 0xf) << 4; break;
case 2: b24[1] |= (e >> 2) & 0xf;
b24[2] |= (e & 0x3) << 6; break;
case 3: b24[2] |= e; break;
}
if (++b == 4) {
*po++ = b24[0];
*po++ = b24[1];
*po++ = b24[2];
b24[0] = b24[1] = b24[2] = 0;
b = 0;
}
}
fwrite(out, 1, (po - out), outfp);
}
eprintf("invalid uudecode footer \"====\" not found\n");
}
static void
uudecode(FILE *fp, FILE *outfp)

66
uuencode.c
View File

@ -4,15 +4,19 @@
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <assert.h>
#include "util.h"
static int mflag = 0;
static void uuencodeb64(FILE *, const char *, const char *);
static void uuencode(FILE *, const char *, const char *);
static void
usage(void)
{
eprintf("usage: %s [file] name\n", argv0);
eprintf("usage: %s [-m] [file] name\n", argv0);
}
int
@ -22,7 +26,8 @@ main(int argc, char *argv[])
ARGBEGIN {
case 'm':
eprintf("-m not implemented\n");
mflag = 1;
break;
default:
usage();
} ARGEND;
@ -31,16 +36,69 @@ main(int argc, char *argv[])
usage();
if (argc == 1) {
uuencode(stdin, argv[0], "<stdin>");
if (mflag)
uuencodeb64(stdin, argv[0], "<stdin>");
else
uuencode(stdin, argv[0], "<stdin>");
} else {
if (!(fp = fopen(argv[0], "r")))
eprintf("fopen %s:", argv[0]);
uuencode(fp, argv[1], argv[0]);
if (mflag)
uuencodeb64(fp, argv[1], argv[0]);
else
uuencode(fp, argv[1], argv[0]);
fclose(fp);
}
return 0;
}
static const char b64et[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
/* much faster */
static unsigned int
b64e(unsigned char b[2])
{
unsigned int o = 0;
unsigned int p = b[2] | (b[1] << 8) | (b[0] << 16);
o = b64et[p & 0x3f]; p >>= 6;
o = (o << 8) | b64et[p & 0x3f]; p >>= 6;
o = (o << 8) | b64et[p & 0x3f]; p >>= 6;
o = (o << 8) | b64et[p & 0x3f];
return o;
}
static void
uuencodeb64(FILE *fp, const char *name, const char *s)
{
struct stat st;
ssize_t n, m = 0;
unsigned char buf[45], *pb;
unsigned int out[sizeof(buf)/3 + 1], *po;
if (fstat(fileno(fp), &st) < 0)
eprintf("fstat %s:", s);
printf("begin-base64 %o %s\n", st.st_mode & 0777, name);
/* write line by line */
while ((n = fread(buf, 1, sizeof(buf), fp))) {
/* clear old buffer if converting with non-multiple of 3 */
if (n != sizeof(buf) && (m = n % 3) != 0) {
buf[n] = '\0'; /* m == 2 */
if (m == 1) buf[n+1] = '\0'; /* m == 1 */
}
for (pb = buf, po = out; pb < buf + n; pb += 3)
*po++ = b64e(pb);
if (m != 0) {
unsigned int mask = 0xffffffff, dest = 0x3d3d3d3d;
/* m==2 -> 0x00ffffff; m==1 -> 0x0000ffff */
mask >>= ((3-m) << 3);
po[-1] = (po[-1] & mask) | (dest & ~mask);
}
*po++ = '\n';
fwrite(out, 1, (po - out) * sizeof(unsigned int) - 3, stdout);
}
if (ferror(fp))
eprintf("'%s' read error:", s);
puts("====");
}
static void
uuencode(FILE *fp, const char *name, const char *s)
{