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add -C -A -B option ,function similar to grep #3

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add -C -A -B option ,function similar to grep #3

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129 changes: 107 additions & 22 deletions bgrep.c
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,28 @@

#define BGREP_VERSION "0.2"

/**
* @brief
*
* @return void
* @retval
* @see
* @note
* @author chenyuzhen
* @date 2012/12/15 11:23:17
**/
void usage(){
const char * usage_desc=
"bgrep version: %s\n"
"usage: bgrep <hex> [<path> [...]] [options]\n"
"\tvalid options are\n"
"\t\t-B NUM -- print {NUM} bytes before matching binary \n"
"\t\t-A NUM -- print {NUM} bytes after matching binary \n"
"\t\t-C NUM -- print {NUM} bytes before and after matching binary \n";

printf(usage_desc,BGREP_VERSION);
}

int ascii2hex(char c)
{
if (c < '0')
Expand All @@ -54,7 +76,7 @@ int ascii2hex(char c)
return -1;
}

void searchfile(const char *filename, int fd, const unsigned char *value, const unsigned char *mask, int len)
void searchfile(const char *filename, int fd, const unsigned char *value, const unsigned char *mask, int len,int before,int after)
{
off_t offset = 0;
unsigned char buf[1024];
Expand All @@ -74,25 +96,49 @@ void searchfile(const char *filename, int fd, const unsigned char *value, const
return;
} else if (!r)
return;
int o, i;

int o, i, need;
for (o = offset ? 0 : len; o < r; ++o)
{
for (i = 0; i <= len; ++i)
for (i = 0; i <= len; ++i){
if ((buf[o + i] & mask[i]) != value[i])
break;
}
if (i > len)
{
printf("%s: %08llx\n", filename, (unsigned long long)(offset + o - len));
need=before;
printf("%s: offset:%08llX find ", filename, (unsigned long long)(offset + o - len));
while( (o-len) < need ){
need--;
}

for(i = need; i > 0 ; i--){
printf("%02X",buf[o-i]);
}

for(i=0; i <= len; ++i ){
printf("\e[1;33m%02X\e[0m",buf[o + i]);
}

need=after;
while( o+need >=r ){
need--;
}

for(i=1; i <= need; ++i){
printf("%02X",buf[ o+len+i ]);
}

printf("\n");
}
}

offset += r;

}
}

void recurse(const char *path, const unsigned char *value, const unsigned char *mask, int len)
void recurse(const char *path, const unsigned char *value, const unsigned char *mask, int len,int before,int after)
{
struct stat s;
if (stat(path, &s))
Expand All @@ -107,7 +153,7 @@ void recurse(const char *path, const unsigned char *value, const unsigned char *
perror(path);
else
{
searchfile(path, fd, value, mask, len);
searchfile(path, fd, value, mask, len, before, after);
close(fd);
}
return;
Expand All @@ -119,7 +165,7 @@ void recurse(const char *path, const unsigned char *value, const unsigned char *
perror(path);
exit(3);
}

struct dirent *d;
while ((d = readdir(dir)))
{
Expand All @@ -129,24 +175,25 @@ void recurse(const char *path, const unsigned char *value, const unsigned char *
strcpy(newpath, path);
strcat(newpath, "/");
strcat(newpath, d->d_name);
recurse(newpath, value, mask, len);
recurse(newpath, value, mask, len, before, after);
}

closedir(dir);
}

int main(int argc, char **argv)
{
unsigned char value[0x100], mask[0x100];
int len = 0;

int before_count=4;
int after_count=4;

if (argc < 2)
{
fprintf(stderr, "bgrep version: %s\n", BGREP_VERSION);
fprintf(stderr, "usage: %s <hex> [<path> [...]]\n", *argv);
usage();
return 1;
}

char *h = argv[1];
while (*h && h[1] && len < 0x100)
{
Expand All @@ -162,7 +209,7 @@ int main(int argc, char **argv)
{
int v0 = ascii2hex(*h++);
int v1 = ascii2hex(*h++);

if ((v0 == -1) || (v1 == -1))
{
fprintf(stderr, "invalid hex string!\n");
Expand All @@ -171,20 +218,58 @@ int main(int argc, char **argv)
value[len] = (v0 << 4) | v1; mask[len++] = 0xFF;
}
}

if (!len || *h)
{
fprintf(stderr, "invalid/empty search string\n");
return 2;
}

if (argc < 3)
searchfile("stdin", 0, value, mask, len);
searchfile("stdin", 0, value, mask, len, before_count, after_count);
else
{
int c = 2;
while (c < argc)
recurse(argv[c++], value, mask, len);
int locale_argc=argc;
while(c < argc){
if(argv[c] && !strcmp(argv[c],"-B")){
c++;
if(locale_argc == argc){
locale_argc=c;
}
if(c < argc && argv[c]){
before_count=atoi(argv[c]);
}
c++;
}
else if(argv[c] && !strcmp(argv[c],"-A")){
c++;
if(locale_argc == argc){
locale_argc=c;
}
if(c < argc && argv[c]){
after_count=atoi(argv[c]);
}
c++;
}
else if(argv[c] && !strcmp(argv[c],"-C")){
c++;
if(locale_argc == argc){
locale_argc=c;
}
if(c < argc && argv[c]){
before_count=atoi(argv[c]);
after_count=atoi(argv[c]);
}
c++;
}
else{
c++;
}
}
c=2;
while (c < locale_argc)
recurse(argv[c++], value, mask, len,before_count,after_count);
}
return 0;
}