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#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <search.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "blaze822.h"
int gen_b64(uint8_t *s, off_t size)
{
static char *b64 =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
off_t i;
int l;
uint32_t v;
for (i = 0, l = 0; i+2 < size; i += 3) {
v = (s[i] << 16) | (s[i+1] << 8) | s[i+2];
putc_unlocked(b64[(v & 0xfc0000) >> 18], stdout);
putc_unlocked(b64[(v & 0x03f000) >> 12], stdout);
putc_unlocked(b64[(v & 0x000fc0) >> 6], stdout);
putc_unlocked(b64[(v & 0x3f)], stdout);
l += 4;
if (l > 72) {
l = 0;
printf("\n");
}
}
if (size - i == 2) { // 2 bytes left, XXX=
v = (s[size - 2] << 16) | (s[size - 1] << 8);
putc_unlocked(b64[(v & 0xfc0000) >> 18], stdout);
putc_unlocked(b64[(v & 0x03f000) >> 12], stdout);
putc_unlocked(b64[(v & 0x000fc0) >> 6], stdout);
putc_unlocked('=', stdout);
} else if (size - i == 1) { // 1 byte left, XX==
v = s[size - 1] << 16;
putc_unlocked(b64[(v & 0xfc0000) >> 18], stdout);
putc_unlocked(b64[(v & 0x03f000) >> 12], stdout);
putc_unlocked('=', stdout);
putc_unlocked('=', stdout);
}
printf("\n");
return 0;
}
int gen_qp(uint8_t *s, off_t size)
{
off_t i;
int linelen = 0;
char prev = 0;
for (i = 0; i < size; i++) {
if ((s[i] > 126) ||
(s[i] < 32 && s[i] != '\n' && s[i] != '\t') ||
(s[i] == '=')) {
printf("=%02X", s[i]);
linelen += 3;
prev = s[i];
} else if (s[i] == '\n') {
if (i > 1 && (prev == ' ' || prev == '\t'))
puts("=");
putc_unlocked('\n', stdout);
linelen = 0;
prev = 0;
} else {
putc_unlocked(s[i], stdout);
linelen++;
prev = s[i];
}
if (linelen >= 75) {
linelen = 0;
prev = '\n';
puts("=");
}
}
if (linelen > 0)
puts("=");
return 0;
}
static const char *
basenam(const char *s)
{
char *r = strrchr(s, '/');
return r ? r + 1 : s;
}
int gen_file(char *file, char *ct)
{
int fd = open(file, O_RDONLY);
if (!fd)
return 0;
struct stat st;
fstat(fd, &st);
uint8_t *content = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (content == MAP_FAILED)
return -1;
off_t bithigh = 0;
off_t bitlow = 0;
off_t linelen = 0;
off_t maxlinelen = 0;
off_t i;
for (i = 0; i < st.st_size; i++) {
if (content[i] == '\n') {
if (maxlinelen < linelen)
maxlinelen = linelen;
linelen = 0;
} else {
linelen++;
}
if (content[i] != '\t' && content[i] != '\n' && content[i] < 32)
bitlow++;
if (content[i] > 127)
bithigh++;
}
printf("Content-Disposition: attachment; filename=\"%s\"\n",
basenam(file));
if (bitlow == 0 && bithigh == 0 &&
maxlinelen <= 72 && content[st.st_size-1] == '\n') {
if (!ct)
ct = "text/plain";
printf("Content-Type: %s\n", ct);
printf("Content-Transfer-Encoding: 7bit\n\n");
fwrite(content, 1, st.st_size, stdout);
return 0;
} else if (bitlow == 0 && bithigh == 0) {
if (!ct)
ct = "text/plain";
printf("Content-Type: %s\n", ct);
printf("Content-Transfer-Encoding: quoted-printable\n\n");
return gen_qp(content, st.st_size);
} else if (bitlow > st.st_size/10 || bithigh > st.st_size/4) {
if (!ct)
ct = "application/binary";
printf("Content-Type: %s\n", ct);
printf("Content-Transfer-Encoding: base64\n\n");
return gen_b64(content, st.st_size);
} else {
if (!ct)
ct = "text/plain";
printf("Content-Type: %s\n", ct);
printf("Content-Transfer-Encoding: quoted-printable\n\n");
return gen_qp(content, st.st_size);
}
}
int
gen_mixed(int argc, char *argv[])
{
char sep[100];
snprintf(sep, sizeof sep, "----_=_%08lx%08lx%08lx_=_",
lrand48(), lrand48(), lrand48());
int i;
printf("Content-Type: multipart/mixed; boundary=\"%s\"\n", sep);
printf("\n");
printf("This is a multipart message in MIME format.\n\n");
for (i = 0; i < argc; i++) {
printf("--%s\n", sep);
gen_file(argv[i], 0);
}
printf("--%s--\n", sep);
return 0;
}
int
gen_build()
{
char sep[100];
snprintf(sep, sizeof sep, "----_=_%08lx%08lx%08lx_=_",
lrand48(), lrand48(), lrand48());
char *line = 0;
size_t linelen = 0;
int inheader = 1;
int intext = 0;
while (1) {
int read = getline(&line, &linelen, stdin);
if (read == -1) {
if (feof(stdin))
break;
else
exit(1);
}
if (inheader) {
if (line[0] == '\n') {
inheader = 0;
printf("MIME-Version: 1.0\n");
printf("Content-Type: multipart/mixed; boundary=\"%s\"\n", sep);
printf("\n");
printf("This is a multipart message in MIME format.\n\n");
} else {
printf("%s", line);
}
continue;
}
if (line[0] == '#') {
char *f = strchr(line, ' ');
*f = 0;
if (strchr(line, '/')) {
printf("--%s\n", sep);
if (line[read-1] == '\n')
line[read-1] = 0;
gen_file(f+1, (char *)line+1);
intext = 0;
continue;
}
}
if (!intext) {
printf("--%s\n", sep);
printf("Content-Type: text/plain\n");
printf("Content-Disposition: inline\n");
printf("Content-Transfer-Encoding: quoted-printable\n\n");
intext = 1;
}
gen_qp((uint8_t *)line, strlen(line));
}
printf("--%s--\n", sep);
free(line);
return 0;
}
int
main(int argc, char *argv[])
{
srand48(time(0) ^ getpid());
if (argc == 1)
return gen_build();
printf("MIME-Version: 1.0\n");
if (argc >= 2)
return gen_mixed(argc-1, argv+1);
else
return gen_file(argv[1], 0);
}
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