Mirror of :pserver:cvs@cvs.fefe.de:/cvs libowfat https://www.fefe.de/libowfat/
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#include <unistd.h>
#include <stdlib.h>
#include "textcode.h"
#include "str.h"
#include "buffer.h"
#include "open.h"
int main(int argc,char* argv[]) {
char buf[4096];
char obuf[4096];
buffer filein;
buffer fileout;
int fd=0;
int ofd=-1;
int broken_encoder=0;
int found=0;
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char line[1000]; /* uuencoded lines can never be longer than 64 characters */
int l;
enum { BEFOREBEGIN, AFTERBEGIN, SKIPHEADER } state=BEFOREBEGIN;
enum { UUDECODE, YENC } mode=UUDECODE;
unsigned long fmode=0,lineno=0;
unsigned long offset,endoffset,totalsize,linelen; /* used only for yenc */
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);
again:
/* skip to "^begin " */
for (;;) {
if ((l=buffer_getline(&filein,line,(sizeof line)-1))==0 && line[l]!='\n') {
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if (state!=BEFOREBEGIN) {
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);
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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;
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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);
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close(ofd);
}
++found;
}
state=BEFOREBEGIN;
if (line[l=6+scan_8long(line+6,&fmode)]==' ' && fmode) {
int i;
++l;
mode=UUDECODE;
foundfilename:
if (line[l]=='"') {
int m;
++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 {
buffer_puts(buffer_2,"decoding file \"");
buffer_puts(buffer_2,line+l);
buffer_putsflush(buffer_2,"\"\n");
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state=AFTERBEGIN;
buffer_init(&fileout,write,ofd,obuf,sizeof obuf);
continue;
}
}
}
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} 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,"=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," 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;
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")) {
unsigned long cur;
if (ofd>=0) {
off_t rlen;
buffer_flush(&fileout);
rlen=lseek(ofd,0,SEEK_CUR)-offset;
if (rlen != endoffset-offset) {
int toomuch=rlen-(endoffset-offset);
buffer_puts(buffer_2,"warning: part size ");
buffer_putulong(buffer_2,rlen);
buffer_puts(buffer_2,", expected ");
buffer_putulong(buffer_2,endoffset-offset);
buffer_putsflush(buffer_2,"!\n");
}
close(ofd);
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ofd=-1;
}
++found;
state=BEFOREBEGIN;
continue;
} else if (!line[0]) {
if (state==AFTERBEGIN)
state=SKIPHEADER;
} else {
unsigned int scanned,x;
char tmp[300];
switch (mode) {
case UUDECODE: x=scan_uuencoded(line,tmp,&scanned); break;
case YENC:
/* work around broken yenc encoders */
if ((line[0]=='.' && line[1]=='.') ||
(line[0]=='>' && line[1]=='.')) {
if (l>linelen && line[l-2]!='=') {
if (!broken_encoder) {
broken_encoder=1;
buffer_putsflush(buffer_2,"compensating for broken encoder...\n");
}
x=scan_yenc(line+1,tmp,&scanned);
break;
}
}
x=scan_yenc(line,tmp,&scanned);
break;
}
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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");
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return 1;
}
} else {
if (ofd>=0)
buffer_put(&fileout,tmp,scanned);
}
}
}
}