LogalDeveloper/Minecraft-Overviewer
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Fixed nether rendering crash

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The nether rendering mode was not properly handling x and z values
outside of the range 0 to 15.  This was causing an out-of-bounds
segfault when accessing the remove_block array.

Fixes #881
Fixes #851
Fixes #852
This commit is contained in:
Andrew Chin
2013-02-07 19:44:56 -05:00
parent 94f51136b1
commit 2377b3cd52
3 changed files with 10 additions and 8 deletions
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2
overviewer_core/src/overviewer.h
View File

@@ -26,7 +26,7 @@
// increment this value if you've made a change to the c extesion
// and want to force users to rebuild
#define OVERVIEWER_EXTENSION_VERSION 41
#define OVERVIEWER_EXTENSION_VERSION 42
/* Python PIL, and numpy headers */
#include <Python.h>

12
overviewer_core/src/primitives/nether.c
View File

@@ -23,20 +23,20 @@ walk_chunk(RenderState *state, RenderPrimitiveNether *data) {
int x, y, z;
int id;
for (x = 0; x < WIDTH; x++) {
for (z = 0; z < DEPTH; z++) {
for (x = -1; x < WIDTH + 1; x++) {
for (z = -1; z < DEPTH + 1; z++) {
id = get_data(state, BLOCKS, x, NETHER_ROOF - (state->chunky * 16), z);
if (id == 7) {
data->remove_block[x][NETHER_ROOF][z] = 1;
data->remove_block[x+1][NETHER_ROOF][z+1] = 1;
id = get_data(state, BLOCKS, x, (NETHER_ROOF + 1) - (state->chunky * 16), z);
if (id == 39 || id == 40)
data->remove_block[x][NETHER_ROOF + 1][z] = 1;
data->remove_block[x+1][NETHER_ROOF + 1][z+1] = 1;
}
for (y = NETHER_ROOF-1; y>=0; y--) {
id = get_data(state, BLOCKS, x, y - (state->chunky * 16), z);
if (id == 7 || id == 87)
data->remove_block[x][y][z] = 1;
data->remove_block[x+1][y][z+1] = 1;
else
break;
}
@@ -56,7 +56,7 @@ nether_hidden(void *data, RenderState *state, int x, int y, int z) {
walk_chunk(state, self);
real_y = y + (state->chunky * 16);
return self->remove_block[x][real_y][z];
return self->remove_block[x+1][real_y][z+1];
}
RenderPrimitiveInterface primitive_nether = {

4
overviewer_core/src/primitives/nether.h
View File

@@ -22,9 +22,11 @@
#define DEPTH 16
#define HEIGHT 256
// add two to these because the primative functions should expect to
// deal with x and z values of -1 and 16
typedef struct {
int walked_chunk;
int remove_block[WIDTH][HEIGHT][DEPTH];
int remove_block[WIDTH+2][HEIGHT][DEPTH+2];
} RenderPrimitiveNether;