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/* The data structures for the Windows NT registry and some of the code within
* this source file was written by Aaron D. Brooks for the BeeHive project
* (http://sourceforge.net/project/?group_id=1987) and licensed under the GPL
* v2.
*
* UTF-16 to UTF-8 conversion taken from VLC.
*/
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "registry.h"
/* MSB (big endian)/LSB (little endian) conversions - network order is always
* MSB, and should be used for both network communications and files. Note that
* byte orders other than little and big endians are not supported, but only
* the VAX seems to have such exotic properties. */
static inline uint16_t U16_AT( void const * _p )
{
uint8_t * p = (uint8_t *)_p;
return ( ((uint16_t)p[0] << 8) | p[1] );
}
/**
* UTF16toUTF8: converts UTF-16 (host byte order) to UTF-8
*
* @param src UTF-16 bytes sequence, aligned on a 16-bits boundary
* @param len number of uint16_t to convert
*/
static char *
UTF16toUTF8( const uint16_t *in, size_t len, size_t *newlen )
{
char *res, *out;
/* allocate memory */
out = res = (char *)malloc( 3 * len );
if( res == NULL )
return NULL;
while( len > 0 )
{
uint32_t uv = *in;
in++;
len--;
if( uv < 0x80 )
{
*out++ = uv;
continue;
}
if( uv < 0x800 )
{
*out++ = (( uv >> 6) | 0xc0);
*out++ = (( uv & 0x3f) | 0x80);
continue;
}
if( (uv >= 0xd800) && (uv < 0xdbff) )
{ /* surrogates */
uint16_t low = U16_AT( in );
in++;
len--;
if( (low < 0xdc00) || (low >= 0xdfff) )
{
*out++ = '?'; /* Malformed surrogate */
continue;
}
else
uv = ((uv - 0xd800) << 10) + (low - 0xdc00) + 0x10000;
}
if( uv < 0x10000 )
{
*out++ = (( uv >> 12) | 0xe0);
*out++ = (((uv >> 6) & 0x3f) | 0x80);
*out++ = (( uv & 0x3f) | 0x80);
continue;
}
else
{
*out++ = (( uv >> 18) | 0xf0);
*out++ = (((uv >> 12) & 0x3f) | 0x80);
*out++ = (((uv >> 6) & 0x3f) | 0x80);
*out++ = (( uv & 0x3f) | 0x80);
continue;
}
}
len = out - res;
res = realloc( res, len );
if( newlen != NULL )
*newlen = len;
return res;
}
/**
* FromUTF16(): converts an UTF-16 string to UTF-8.
*
* @param src UTF-16 bytes sequence, aligned on a 16-bits boundary.
*
* @return the result of the conversion (must be free()'d),
* or NULL in case of error.
*/
char *FromUTF16( const uint16_t *src )
{
const uint16_t *in;
size_t len;
/* determine the size of the string */
for( len = 1, in = src; *in; len++ )
in++;
return UTF16toUTF8( src, len, NULL );
}
char* findkey(const char* location, const char* path)
{
FILE *hive;
int numread;
REGF myregf;
char* hbinptr;
char* ret = NULL;
// FIXME
char* arr;
arr = strdup(path);
hive = fopen(location,"r");
if(hive)
{
numread = fread(&myregf,sizeof(char),sizeof(REGF),hive);
char* key;
if((key = strrchr(arr, '\\')) != NULL){
*key++ = '\0';
}
hbinptr = (char*)malloc(myregf.hivesize);
if(hbinptr)
{
numread = fread(hbinptr,sizeof(char),myregf.hivesize,hive);
NK* back = getkey(hbinptr,(NK*)&(hbinptr[myregf.firstkey]), &arr);
if(back != NULL) {
ret = printk(hbinptr, back, key);
}
free(hbinptr);
// if(key)
// free(key);
}
} else {
fprintf(stderr, "Unable to open the registry file at '%s'\n%d: %s\n",
location, errno, strerror(errno));
return NULL;
}
fclose(hive);
if(ret)
return ret;
else
return NULL;
}
char* expand_string(const char *string) {
if(strcmp(string, "%SystemDrive%") == 0) {
// FIXME:
return strdup("C:");
} else {
fprintf(stderr, "Unable to expand '%s'.\n", string);
exit(EXIT_FAILURE);
}
}
char* printk(char* base, NK* thisnk, char* key) {
int i;
int* valptr;
if(thisnk->numvalues > 0)
{
valptr=(int*) &(base[thisnk->myvallist]);
for(i=1; i<thisnk->numvalues+1; i++)
{
if(valptr[i]>0)
{
VK* thisvk = (VK*) &(base[valptr[i]]);
char* szname;
//int vksize=sizeof(VK)+thisvk->namesize;
szname = (char*) malloc (thisvk->namesize+1);
strncpy(szname,(char*)(thisvk+1),thisvk->namesize+1);
szname[thisvk->namesize]= 0;
if(strcmp(szname,key) == 0){
if(thisvk->flag && 0x0000000000000001){
// FIXME: Handle REG_EXPAND_SZ
// better
if (thisvk->valtype == REG_SZ || thisvk->valtype == REG_EXPAND_SZ){
char* tmp = NULL;
// Emtpy string.
if((base+4+(thisvk->mydata))[0] == 0)
return NULL;
// Convert to UTF-8.
tmp = FromUTF16((uint16_t*)(base+4+(thisvk->mydata)));
if(thisvk->valtype == REG_EXPAND_SZ) {
char *start, *end;
int startc = 0;
int endc = 0;
start = tmp;
while(*start != '\0') {
if(*start == '%') {
end = start+1;
endc = startc+1;
while(*end != '%') {
if(*end == '\0') {
fprintf(stderr, "Unmatched '%%' in %s.\n", tmp);
exit(EXIT_FAILURE);
}
end++;
endc++;
}
//printf("endc: %d end: %s\n", endc, end);
//printf("startc: %d start: %s\n", startc, start);
char* toexpand = malloc((endc-startc+1)+1);
memcpy(toexpand, start, (endc-startc+1));
toexpand[endc-startc+1] = '\0';
//printf("toexpand: %s\n", toexpand);
char* expanded = expand_string(toexpand);
free(toexpand);
//printf("expanded: %s\n", expanded);
int linelen = strlen(tmp) -
(endc-startc+1) + strlen(expanded) + 1;
//printf("linelen: %d\n", linelen);
char* newtmp = malloc(linelen);
strncpy(newtmp, tmp, startc);
strcat(newtmp, expanded);
strcat(newtmp, end+1);
//printf("newtmp: %s\n", newtmp);
free(tmp);
free(expanded);
tmp = newtmp;
endc = 0;
startc = 0;
start=tmp;
} else {
start++;
startc++;
}
}
}
return tmp;
} else if(thisvk->valtype == REG_DWORD) {
char* tmp;
tmp = malloc(8);
sprintf(tmp, "%d",thisvk->mydata);
return tmp;
}
}
}
free(szname);
}
}
}
return NULL;
}
NK* getkey(char* base, NK* thisnk, char** path) {
NK* tmp;
LF* lfrec = (LF*) &(base[thisnk->mylfrec]);
HASH* hasharray = (HASH*) lfrec +1;
int i;
char* element;
if((element = str_token(path, "\\")) != NULL) {
if(thisnk->numchildren > 0) {
for(i=0; i<thisnk->numchildren; i++) {
tmp = (NK*)&(base[(hasharray+i)->nkrec]);
char* szname;
szname = (char*) malloc (tmp->namesize+1);
strncpy(szname,(char*)(tmp+1),tmp->namesize+1);
szname[tmp->namesize]= 0;
if(strcmp(szname,element) == 0){
thisnk = getkey(base, tmp, path);
free(szname);
return thisnk;
}
free(szname);
}
return NULL;
}
}
return thisnk;
}
/* Reentrant strtok, taken from a Usenet post:
* http://groups.google.com/group/comp.lang.c/msg/9e92ba098baa55ac?dmode=source
*/
char *str_token( char **string, char *delimiters ) {
char *rv, *wrk, empty[] = "";
/******************************************************************/
/* Beware the NULL pointer ! */
/******************************************************************/
if ( delimiters == NULL )
delimiters = empty;
if ( string == NULL || *string == NULL || **string == '\0' )
rv = NULL;
/******************************************************************/
/* If there are no delimiters the string is the token. */
/******************************************************************/
else if ( ( wrk = strpbrk( *string, delimiters ) ) == NULL ) {
rv = *string;
*string += strlen( rv );
}
/******************************************************************/
/* Skip past any delimiters at the beginning of the string. */
/******************************************************************/
else if ( wrk == *string ) {
*string += strspn( wrk, delimiters );
rv = str_token( string, delimiters );
}
/******************************************************************/
/* Got a token! Null terminate it and prep for the next call. */
/******************************************************************/
else {
*wrk++ = '\0';
rv = *string;
*string = wrk + strspn( wrk, delimiters );
}
return rv;
}
// vim:ai:et:sts=4:tw=80:sw=4:
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