Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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/* this is a uudecode that also handles yenc encoded data. The encoded
* messages are read from stdin. The yenc decoder even tries to
* reconstruct mutilated encodings. One of my news servers has the
* problem that it gets corrupted yenc data through one of the uplinks
* that replace "^." with "^..". This decoder will try reversing this
* when decoding a part with broken crc. */
#include <unistd.h>
#include <stdlib.h>
#include "textcode.h"
#include "str.h"
#include "buffer.h"
#include "open.h"
#include "stralloc.h"
#include "scan.h"
#include "case.h"
static const uint32_t crc_table[256] = {
0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
0x2d02ef8dL
};
uint32_t crc32(uint32_t crc, const char* buf, unsigned int len) {
const unsigned char* b=(const unsigned char*)buf;
crc = crc ^ 0xfffffffful;
while (len) {
crc = (crc >> 8) ^ crc_table[(crc & 0xff) ^ *b];
++b; --len;
}
return crc ^ 0xfffffffful;
}
int main(int argc,char* argv[]) {
char buf[4096];
char obuf[4096];
buffer filein;
buffer fileout;
int fd=0;
int ofd=-1;
int found=0;
char line[1000]; /* uuencoded lines can never be longer than 64 characters */
int l;
enum { BEFOREBEGIN, AFTERBEGIN, SKIPHEADER } state=BEFOREBEGIN;
enum { UUDECODE, YENC, MIME } mode=UUDECODE;
enum { NONE, BASE64, QP} mimeenc=NONE;
char filename[1024];
unsigned long fmode=0,lineno=0;
unsigned long offset,endoffset,totalsize,linelen,part,reconstructed; /* used only for yenc */
static stralloc yencpart;
unsigned int crc;
if (argc>1) {
fd=open_read(argv[1]);
if (fd<0) {
buffer_puts(buffer_2,"error: could not open \"");
buffer_puts(buffer_2,argv[1]);
buffer_putsflush(buffer_2,"\"\n");
return 1;
}
}
buffer_init(&filein,read,fd,buf,sizeof buf);
/* skip to "^begin " */
for (;;) {
if ((l=buffer_getline(&filein,line,(sizeof line)-1))==0 && line[l]!='\n') {
hiteof:
if (state!=BEFOREBEGIN) {
if (mode!=MIME) {
buffer_puts(buffer_1,"premature end of file in line ");
buffer_putulong(buffer_1,lineno);
buffer_putsflush(buffer_1,"!\n");
}
if (ofd>=0) {
buffer_flush(&fileout);
fchmod(ofd,fmode);
close(ofd);
}
++found;
}
if (!found)
buffer_putsflush(buffer_2,"warning: hit end of file without finding any uuencoded data!\n");
return 0;
}
++lineno;
if (l>0 && line[l-1]=='\r') --l; /* kill DOS line endings */
line[l]=0;
if (str_start(line,"begin ")) {
if (state!=BEFOREBEGIN) {
buffer_puts(buffer_1,"new begin without previous end in line ");
buffer_putulong(buffer_1,lineno);
buffer_putsflush(buffer_1,"!\n");
if (ofd>=0) {
buffer_flush(&fileout);
fchmod(ofd,fmode);
close(ofd);
}
++found;
}
state=BEFOREBEGIN;
if (line[l=6+scan_8long(line+6,&fmode)]==' ' && fmode) {
int i;
++l;
mode=UUDECODE;
foundfilename:
if (line[l]=='"') {
++l;
line[str_chr(line+l,'"')]=0;
}
if (line[l+(i=str_rchr(line+l,'/'))]) l+=i+1;
while (line[l]=='.') ++l;
if (line[l]) {
if (mode==YENC)
ofd=open_write(line+l);
else
ofd=open_excl(line+l);
if (ofd<0) {
buffer_puts(buffer_2,"error: could not create file \"");
buffer_puts(buffer_2,line+l);
buffer_putsflush(buffer_2,"\" (must not exist yet)\n");
} else {
if (mode!=YENC || part==1) {
if (mode==YENC)
buffer_puts(buffer_2,"decoding yEnc file \"");
else
buffer_puts(buffer_2,"uudecoding file \"");
buffer_puts(buffer_2,line+l);
buffer_putsflush(buffer_2,"\"\n");
}
state=AFTERBEGIN;
buffer_init(&fileout,write,ofd,obuf,sizeof obuf);
continue;
}
}
}
} else if (str_equal(line,"end")) {
if (ofd>=0) {
buffer_flush(&fileout);
fchmod(ofd,fmode);
close(ofd);
ofd=-1;
}
++found;
state=BEFOREBEGIN;
continue;
} else if (str_start(line,"Content-Disposition: ")) {
char* c=strstr(line,"filename=");
if (!c) {
if ((l=buffer_getline(&filein,line,(sizeof line)-1))==0 && line[l]!='\n') goto hiteof;
c=strstr(line,"filename=");
}
if (c) {
mode=MIME;
filename[0]=0;
c+=9;
if (*c=='"') {
char* d=strchr(c+1,'"');
if (d) {
*d=0;
strcpy(filename,c+1);
}
}
if (!filename[0]) {
strcpy(filename,c);
/* TODO: truncate at space */
}
if (state!=BEFOREBEGIN) {
if (ofd>=0) {
buffer_flush(&fileout);
fchmod(ofd,fmode);
close(ofd);
ofd=-1;
}
++found;
}
fmode=0644;
}
} else if (str_start(line,"Content-Transfer-Encoding: ")) {
if (case_starts(line+27,"base64"))
mimeenc=BASE64;
else if (case_starts(line+27,"quoted-printable"))
mimeenc=QP;
else if (case_starts(line+27,"7bit"))
mimeenc=NONE; /* this is not an attachment */
else {
buffer_puts(buffer_1,"unknown encoding \"");
buffer_puts(buffer_1,line+27);
buffer_puts(buffer_1,"\" on line ");
buffer_putulong(buffer_1,lineno);
buffer_putsflush(buffer_1,".\n");
}
} else if (!line[0]) {
/* empty line */
if (ofd==-1 && filename[0]) {
ofd=open_excl(filename);
if (ofd<0) {
buffer_puts(buffer_2,"error: could not create file \"");
buffer_puts(buffer_2,filename);
buffer_putsflush(buffer_2,"\" (must not exist yet)\n");
} else {
buffer_puts(buffer_2,"decoding MIME attachment \"");
buffer_puts(buffer_2,filename);
buffer_putsflush(buffer_2,"\"\n");
filename[0]=0;
state=AFTERBEGIN;
buffer_init(&fileout,write,ofd,obuf,sizeof obuf);
continue;
}
}
if (state==AFTERBEGIN)
state=SKIPHEADER;
} else if (str_start(line,"=ybegin ")) {
char* filename=strstr(line," name=");
if (!filename) {
invalidybegin:
buffer_puts(buffer_2,"invalid =ybegin at line ");
buffer_putulong(buffer_2,lineno);
buffer_putsflush(buffer_2,".\n");
continue;
}
l=filename-line+6;
if (!(filename=strstr(line," part="))) {
part=1;
} else if (filename[6+scan_ulong(filename+6,&part)] != ' ') goto invalidybegin;
if (part==1) reconstructed=0;
if (!(filename=strstr(line," size="))) goto invalidybegin;
if (filename[6+scan_ulong(filename+6,&totalsize)] != ' ') goto invalidybegin;
if (!(filename=strstr(line," line="))) goto invalidybegin;
if (filename[6+scan_ulong(filename+6,&linelen)] != ' ') goto invalidybegin;
mode=YENC;
stralloc_copys(&yencpart,""); crc=0;
goto foundfilename;
} else if (str_start(line,"=ypart ")) {
char* tmp=strstr(line," begin=");
char c;
if (!tmp) {
invalidpart:
buffer_puts(buffer_2,"invalid =ypart at line ");
buffer_putulong(buffer_2,lineno);
buffer_putsflush(buffer_2,".\n");
continue;
}
c=tmp[7+scan_ulong(tmp+7,&offset)];
if (c!=' ' && c!=0) goto invalidpart;
if (!(tmp=strstr(line," end="))) goto invalidpart;
c=tmp[5+scan_ulong(tmp+5,&endoffset)];
if (c!=' ' && c!=0) goto invalidpart;
--offset; --endoffset;
if (endoffset<offset || endoffset>totalsize) goto invalidpart;
lseek(ofd,offset,SEEK_SET);
continue;
} else if (str_start(line,"=yend")) {
/* first try to decode it normally and see if the CRC matches */
unsigned long i,wantedcrc;
stralloc out;
char* tmp=strstr(line," pcrc32=");
if (tmp) {
if (!scan_xlong(tmp+8,&wantedcrc))
goto invalidpart;
} else if (part==1) {
tmp=strstr(line," crc32=");
if (!tmp) goto invalidpart;
if (!scan_xlong(tmp+7,&wantedcrc))
goto invalidpart;
endoffset=totalsize;
} else goto invalidpart;
stralloc_init(&out);
stralloc_0(&yencpart);
stralloc_ready(&out,yencpart.len);
for (i=0; i<yencpart.len; ) {
unsigned long x,scanned;
x=scan_yenc(yencpart.s+i,out.s+out.len,&scanned);
i+=x+1; out.len+=scanned;
}
i=crc32(0,out.s,out.len);
if (endoffset == offset+out.len-1) ++endoffset;
if (out.len == endoffset-offset && i == wantedcrc) {
/* ok, save block */
buffer_put(&fileout,out.s,out.len);
} else {
out.len=0;
for (i=0; i<yencpart.len; ) {
unsigned long x,scanned;
if (yencpart.s[i]=='.' && yencpart.s[i+1]=='.') ++i;
x=scan_yenc(yencpart.s+i,out.s+out.len,&scanned);
i+=x+1; out.len+=scanned;
}
i=crc32(0,out.s,out.len);
if (out.len == endoffset-offset && i == wantedcrc) {
buffer_put(&fileout,out.s,out.len);
++reconstructed;
} else {
buffer_puts(buffer_2,"warning: part ");
buffer_putulong(buffer_2,part);
buffer_putsflush(buffer_2," corrupt; reconstruction failed.\n");
buffer_put(&fileout,out.s,out.len);
}
}
stralloc_free(&out);
buffer_flush(&fileout);
close(ofd);
ofd=-1;
if (endoffset==totalsize && reconstructed) {
buffer_puts(buffer_2,"warning: had to reconstruct ");
buffer_putulong(buffer_2,reconstructed);
buffer_putsflush(buffer_2," parts!\n");
}
++found;
state=BEFOREBEGIN;
continue;
} else {
unsigned long scanned,x;
char tmp[1000];
switch (mode) {
case MIME:
switch (mimeenc) {
case BASE64: x=scan_base64(line,tmp,&scanned); break;
case QP: x=scan_quotedprintable(line,tmp,&scanned); break;
default:
break;
}
if (line[x]) x=0;
break;
case UUDECODE:
x=scan_uuencoded(line,tmp,&scanned);
break;
case YENC:
stralloc_cats(&yencpart,line);
stralloc_cats(&yencpart,"\n");
continue;
}
if (!x) {
if (state==AFTERBEGIN) {
buffer_puts(buffer_1,"parse error in line ");
buffer_putulong(buffer_1,lineno);
buffer_puts(buffer_1,": \"");
buffer_puts(buffer_1,line);
buffer_putsflush(buffer_1,"\"\n");
state=SKIPHEADER;
}
} else {
if (ofd>=0)
buffer_put(&fileout,tmp,scanned);
}
}
}
}