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(svn r2872) -Feature: [NewGRF] Add support for "extended bytes" 

While here work around a buffer overflow in action 4
This commit is contained in:
tron 2005-08-15 22:48:33 +00:00
parent 1637df1788
commit 0c7af4a5ad
1 changed files with 37 additions and 17 deletions
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54
newgrf.c
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@ -138,6 +138,14 @@ static uint16 grf_load_word(byte **buf)
return val;
}
static uint16 grf_load_extended(byte** buf)
{
uint16 val;
val = grf_load_byte(buf);
if (val == 0xFF) val = grf_load_word(buf);
return val;
}
static uint32 grf_load_dword(byte **buf)
{
uint32 val;
@ -1145,7 +1153,7 @@ static void NewSpriteSet(byte *buf, int len)
* B feature feature to define sprites for
* 0, 1, 2, 3: veh-type, 4: train stations
* B num-sets number of sprite sets
* B num-ent how many entries per sprite set
* E num-ent how many entries per sprite set
* For vehicles, this is the number of different
* vehicle directions in each sprite set
* Set num-dirs=8, unless your sprites are symmetric.
@ -1159,9 +1167,10 @@ static void NewSpriteSet(byte *buf, int len)
uint i;
check_length(len, 4, "NewSpriteSet");
feature = buf[1];
num_sets = buf[2];
num_ents = buf[3];
buf++;
feature = grf_load_byte(&buf);
num_sets = grf_load_byte(&buf);
num_ents = grf_load_extended(&buf);
_cur_grffile->spriteset_start = _cur_spriteid;
_cur_grffile->spriteset_feature = feature;
@ -1599,7 +1608,7 @@ static void VehicleNewName(byte *buf, int len)
* B veh-type see action 0
* B language-id language ID with bit 7 cleared (see below)
* B num-veh number of vehicles which are getting a new name
* B offset number of the first vehicle that gets a new name
* B/W offset number of the first vehicle that gets a new name
* S data new texts, each of them zero-terminated, after
* which the next name begins. */
/* TODO: No support for changing non-vehicle text. Perhaps we shouldn't
@ -1611,15 +1620,25 @@ static void VehicleNewName(byte *buf, int len)
uint8 feature;
uint8 lang;
uint8 id;
uint8 endid;
uint8 num;
uint16 id;
uint16 endid;
const char* name;
check_length(len, 6, "VehicleNewName");
feature = buf[1];
lang = buf[2];
id = buf[4] + _vehshifts[feature];
endid = id + buf[3];
buf++;
feature = grf_load_byte(&buf);
lang = grf_load_byte(&buf);
num = grf_load_byte(&buf);
id = (lang & 0x80) ? grf_load_word(&buf) : grf_load_byte(&buf);
if (feature > 3) {
DEBUG(grf, 7) ("VehicleNewName: Unsupported feature %d, skipping", feature);
return;
}
id += _vehshifts[feature];
endid = id + num;
DEBUG(grf, 6) ("VehicleNewName: About to rename engines %d..%d (feature %d) in language 0x%x.",
id, endid, feature, lang);
@ -1635,8 +1654,8 @@ static void VehicleNewName(byte *buf, int len)
return;
}
name = (const char*)(buf + 5);
len -= 5;
name = (const char*)buf;
len -= (lang & 0x80) ? 6 : 5;
for (; id < endid && len > 0; id++) {
int ofs = strlen(name) + 1;
@ -1657,16 +1676,17 @@ static void GraphicsNew(byte *buf, int len)
/* <05> <graphics-type> <num-sprites> <other data...>
*
* B graphics-type What set of graphics the sprites define.
* B num-sprites How many sprites are in this set?
* E num-sprites How many sprites are in this set?
* V other data Graphics type specific data. Currently unused. */
/* TODO */
uint8 type;
uint8 num;
uint16 num;
check_length(len, 2, "GraphicsNew");
type = buf[0];
num = buf[1];
buf++;
type = grf_load_byte(&buf);
num = grf_load_extended(&buf);
grfmsg(GMS_NOTICE, "GraphicsNew: Custom graphics (type %x) sprite block of length %d (unimplemented, ignoring).\n",
type, num);