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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <libgen.h>
#include <sys/mman.h>
#include <stdio.h>
#include <time.h>
#include <stdarg.h>
#include <math.h>
#include <string>
#include <algorithm>
#include "garminimg.h"
#include "elemdata.h"
#include <memory.h>
using namespace std;
struct fat_block_struct {
string filename;
string extension;
string fullname;
off_t size;
off_t offset;
};
typedef struct fat_block_struct fat_block_t;
extern int errno;
GarminImg::GarminImg ()
{
const struct elem_info_struct *eptr;
xorbyte= 0;
fd= -1;
ptr= NULL;
// Load our element types
for (eptr= polyline_data; eptr->type; ++eptr)
polylines_byname.insert(make_pair(eptr->type, eptr->name));
for (eptr= polygon_data; eptr->type; ++eptr)
polygons_byname.insert(make_pair(eptr->type, eptr->name));
for (eptr= point_data; eptr->type; ++eptr)
points_byname.insert(make_pair(eptr->type, eptr->name));
}
GarminImg::~GarminImg ()
{
file_list_t::iterator fpos;
for (fpos= files.begin(); fpos != files.end(); ++fpos)
delete fpos->second;
if ( fd > -1 ) close(fd);
}
//----------------------------------------------------------------------
// I/O Methods
//----------------------------------------------------------------------
int GarminImg::open (const char *path)
{
string::size_type idx;
struct stat sb;
if ( (fd= ::open(path, O_RDONLY)) == -1 ) return -1;
if ( fstat(fd, &sb) == -1 ) {
close(fd);
return -1;
}
ptr= (byte_t *) mmap(0, sb.st_size, PROT_READ, MAP_SHARED, fd, 0);
if ( ptr == NULL ) {
close(fd);
return -1;
}
start= bof= ptr;
xorbyte= *bof;
buffer.assign(1, xorbyte);
ptr++;
return 0;
}
int GarminImg::seek (off_t offset)
{
seek(offset, SEEK_SET);
}
int GarminImg::seek (off_t offset, int whence)
{
if ( whence == SEEK_SET ) ptr= bof+offset;
else if ( whence == SEEK_CUR ) ptr+= offset;
else return -1;
return 0;
}
off_t GarminImg::tell ()
{
return (off_t) (ptr-bof);
}
//----------------------------------------------------------------------
// Private utility methods
//----------------------------------------------------------------------
void GarminImg::_xor (void *p, size_t len)
{
byte_t *cp= (byte_t *) p;
size_t i= 0;
for (i= 0; i< len; ++i) {
buffer[i]^= xorbyte;
*cp^= xorbyte;
++cp;
}
}
uword_t GarminImg::last_seq_block (off_t stopat)
{
uword_t blockno= get_uword();
uword_t last= 0;
byte_t *stopptr;
stopptr= bof + stopat;
while ( blockno != 0xFFFF && ptr < stopptr )
blockno= get_uword();
ptr-= 4;
return get_uword();
}
//----------------------------------------------------------------------
// Garmin data type methods
//----------------------------------------------------------------------
byte_t GarminImg::get_byte ()
{
byte_t val;
start= ptr;
val= *(ptr++);
if ( xorbyte ) val^= xorbyte;
buffer.assign(1, val);
return val;
}
word_t GarminImg::get_word ()
{
word_t val;
start= ptr;
buffer.assign((const char *)ptr, 2);
#if WORDS_BIGENDIAN
val= (word_t) (*ptr)|(*(ptr+1)<<8));
#else
memcpy(&val, (const char *) ptr, 2);
#endif
if ( xorbyte ) _xor(&val, 2);
ptr+= 2;
return val;
}
uword_t GarminImg::get_uword ()
{
return (uword_t) get_word();
}
dword_t GarminImg::get_dword ()
{
dword_t val;
start= ptr;
buffer.assign((const char *)ptr, 4);
#if WORDS_BIGENDIAN
val= (dword_t) ((*ptr)|(*(ptr+1)<<8)|(*(ptr+2)<<16)|(*(ptr+3)<<24));
#else
memcpy(&val, ptr, 4);
#endif
if ( xorbyte ) _xor(&val, 4);
ptr+= 4;
return val;
}
udword_t GarminImg::get_udword ()
{
return (udword_t) get_dword();
}
dword_t GarminImg::get_int24 ()
{
dword_t val= (dword_t) get_uint24();
if ( val > 0x7FFFFF ) val-= 0xFFFFFF;
return val;
}
udword_t GarminImg::get_uint24 ()
{
udword_t val;
start= ptr;
buffer.assign((const char *)ptr, 3);
val= (udword_t) (*ptr|(*(ptr+1)<<8)|(*(ptr+2)<<16));
if ( xorbyte ) _xor(&val, 3);
ptr+= 3;
return val;
}
string GarminImg::get_string ()
{
string s;
start= ptr;
while ( *ptr != xorbyte ) {
s+= (*ptr^xorbyte);
++ptr;
}
s+= (*ptr^xorbyte);
++ptr;
buffer= s;
return s;
}
string GarminImg::get_string (size_t length)
{
string s;
if ( length == 0 ) return s;
start= ptr;
buffer.assign((const char *)ptr, length);
char *data= new char[length];
if ( data == NULL ) {
ptr+= length;
perror("new");
return s;
}
strncpy(data, (const char *) ptr, length);
if ( xorbyte ) _xor(data, length);
s.assign(data, length);
delete[] data;
ptr+= length;
return s;
}
void GarminImg::get_cstring (void *dst, size_t length)
{
buffer.assign((const char *)ptr, length);
start= ptr;
memcpy(dst, ptr, length);
if ( xorbyte ) _xor(dst, length);
ptr+= length;
}
string GarminImg::get_base11str (char delim)
{
string str11;
string::size_type idx;
string::iterator spos;
int term= 2;
while ( term ) {
byte_t ch= get_byte();
if ( str11.empty() ) {
if ( ch < 0x80 ) {
// No base11 num here
--ptr;
return "";
}
sbuffer_set();
} else sbuffer_append();
if ( ch & 0x80 ) --term;
str11+= base(ch & 0x7F, 11, 2);
}
// Remove trailing delims
if ( (idx= str11.find_last_not_of("A")) != string::npos )
str11.erase(idx+1);
// Convert in-line delimiters to the char delim
for (spos= str11.begin(); spos!= str11.end(); ++spos)
if ( *spos == 'A' ) *spos= delim;
sbuffer_recall();
return str11;
}
time_t GarminImg::get_date ()
{
struct tm stime;
memset(&stime, 0, sizeof(stime));
stime.tm_year= (int) get_word()-1900;
sbuffer_set();
stime.tm_mon= (int) (get_byte() - 1);
sbuffer_append();
stime.tm_mday= (int) get_byte();
sbuffer_append();
stime.tm_hour= (int) get_byte();
sbuffer_append();
stime.tm_min= (int) get_byte();
sbuffer_append();
stime.tm_sec= (int) get_byte();
sbuffer_append();
stime.tm_isdst= 0;
sbuffer_recall();
return mktime(&stime);
}
double GarminImg::degrees (dword_t units)
{
return ((double) units)*((double)360)/((double)(2<<23));
}
double GarminImg::degrees (dword_t units, int bits)
{
if ( bits < 2 ) return 0;
return ((double) units) * ((double)360)/((double)(2<<(bits-1)));
}
//----------------------------------------------------------------------
// Save buffer methods
//----------------------------------------------------------------------
string GarminImg::ibuffer (off_t *start_offset)
{
*start_offset= (off_t) (start-bof);
return buffer;
}
off_t GarminImg::sbuffer_tell ()
{
return (off_t) (save-bof);
}
void GarminImg::sbuffer_set ()
{
sbuffer= buffer;
save= start;
}
void GarminImg::sbuffer_append ()
{
sbuffer+= buffer;
}
void GarminImg::sbuffer_recall ()
{
buffer= sbuffer;
start= save;
}
void GarminImg::sbuffer_swap ()
{
swap(buffer, sbuffer);
swap(start, save);
}
void GarminImg::sbuffer_rtrim (size_t n)
{
sbuffer.erase(sbuffer.size()-n);
}
void GarminImg::sbuffer_ltrim (size_t n)
{
sbuffer.erase(0,n);
start+= n;
}
string::size_type GarminImg::sbuffer_size ()
{
return sbuffer.size();
}
//----------------------------------------------------------------------
// Public utility methods
//----------------------------------------------------------------------
string GarminImg::base (long num, int base, int width)
{
long quot;
static char digit[37]= "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
string val;
val.reserve(32);
if ( base < 2 || base > 36 || width < 1 ) return "";
while (num) {
val.append(1, digit[num%base]);
num/= base;
}
if ( val.size() < width ) val.append(width-val.size(), '0');
reverse(val.begin(), val.end());
return val;
}
//----------------------------------------------------------------------
// IMG infrastructure methods
//----------------------------------------------------------------------
void GarminImg::block_size_exp (unsigned int powoftwo)
{
bsize= (unsigned long) pow(2.0, (double) powoftwo);
}
unsigned long GarminImg::block_size ()
{
return bsize;
}
//----------------------------------------------------------------------
// IMG FAT/file methods
//----------------------------------------------------------------------
class ImgFile *GarminImg::file_find (string name)
{
file_list_t::iterator fpos;
fpos= files.find(name);
if ( fpos == files.end() ) return NULL;
return fpos->second;
}
void GarminImg::set_fileent ()
{
pfileent= files.begin();
}
class ImgFile *GarminImg::get_fileent ()
{
class ImgFile *ptr;
if ( pfileent == files.end() ) return NULL;
ptr= pfileent->second;
++pfileent;
return ptr;
}
//----------------------------------------------------------------------
// Element type methods
//----------------------------------------------------------------------
string GarminImg::elem_polyline_name (uword_t type)
{
poly_name_t::iterator ppos;
ppos= polylines_byname.find(type);
return ( ppos == polylines_byname.end() ) ? "unknown" : ppos->second;
}
string GarminImg::elem_polygon_name (uword_t type)
{
poly_name_t::iterator ppos;
ppos= polygons_byname.find(type);
return ( ppos == polygons_byname.end() ) ? "unknown" : ppos->second;
}
string GarminImg::elem_point_name (uword_t type, uword_t subtype)
{
point_name_t::iterator ppos;
uword_t fulltype= (type<<8)|subtype;
ppos= points_byname.find(fulltype);
return ( ppos == points_byname.end() ) ? "unknown" : ppos->second;
}