From 4f07b8766a5497ad8476be6b6ebb7a8405d1adc0 Mon Sep 17 00:00:00 2001
From: Imanol-Mikel Barba Sabariego <imanol@imanolbarba.net>
Date: Sat, 23 May 2020 17:03:09 +0100
Subject: [PATCH] First import

---
 mcplayerstat.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+), 0 deletions(-)
 create mode 100644 mcplayerstat.c

diff --git a/mcplayerstat.c b/mcplayerstat.c
new file mode 100644
index 0000000..a9f9479
--- /dev/null
+++ b/mcplayerstat.c
@@ -0,0 +1,110 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <byteswap.h>
+
+#include "nbt.h"
+
+double convertDouble(uint64_t data) {
+    double d = 0;
+    uint64_t swapped = __bswap_64(data);
+    memcpy(&d,&swapped,sizeof(uint64_t));
+    return d;
+}
+
+void printInventory(TagList *inv) {
+    for(int j = 0; j < inv->size; ++j) {
+        TagCompound item = *(TagCompound*)inv->list[j].payload;
+        uint8_t slot = 0;
+        char* id;
+        uint8_t count = 0;
+        for(int k = 0; k < item.numTags; ++k) {
+            Tag attr = item.list[k];
+            if(!strncmp(attr.name,"Slot",attr.nameLength)) {
+                slot = *((uint8_t*)attr.payload);
+            } else if(!strncmp(attr.name,"id",attr.nameLength)) {
+                id = (char*)attr.payload;
+            } else if(!strncmp(attr.name,"Count",attr.nameLength)) {
+                count = *((uint8_t*)attr.payload);
+            }
+        }
+        printf("\t- [%u] %ux %s\n",slot,count,id);
+    }
+}
+
+int parseMCPlayerFile(const char* filename) {
+    struct stat sb;
+    unsigned int pos = 0;
+
+    int fd = open(filename,O_RDONLY);
+    if(fd == -1) {
+        perror("Can't open file");
+        return 3;
+    }
+    fstat(fd, &sb);
+
+    void* mappedFile = mmap(NULL,sb.st_size,PROT_READ,MAP_PRIVATE,fd,0);
+
+    // int playerGameType
+    // int XpLevel
+    // list(compound) Inventory
+    // list(compound) EnderItems
+    // list(float) Pos
+
+    Tag t;
+    pos = parseTag((mappedFile + pos),&t);
+    if(pos != sb.st_size) {
+        fprintf(stderr,"Didn't reach end of NBT file\n");
+        return 4;
+    }
+
+    TagCompound root = *(TagCompound*) t.payload;
+    for(int i = 0; i < root.numTags; ++i) {
+        Tag node = root.list[i];
+        if(node.type == TAG_INT) {
+            if(!strncmp(node.name,"playerGameType",node.nameLength)) {
+                int playerGameType = __bswap_32(*((uint32_t*)node.payload));
+                printf("playerGameType: %s\n",(playerGameType == 0 ? "Survival" : (playerGameType == 1 ? "Creative" : (playerGameType == 2 ? "Adventure" : (playerGameType == 3 ? "Spectator" : "UNKNOWN")))));
+            } else if (!strncmp(node.name,"XpLevel",node.nameLength)) {
+                int xpLevel = __bswap_32(*((uint32_t*)node.payload));
+                printf("XpLevel: %u\n",xpLevel);                    
+            }
+        } else if(node.type == TAG_LIST) {
+            TagList* l = (TagList*)node.payload;
+            if(!strncmp(node.name,"Inventory",node.nameLength)) {
+                printf("Inventory:\n");
+                printInventory(l);
+            } else if (!strncmp(node.name,"EnderItems",node.nameLength)) {
+                printf("Ender Inventory:\n");
+                printInventory(l);
+            } else if (!strncmp(node.name,"Pos",node.nameLength)) {
+                double x = convertDouble((*(uint64_t*)l->list[0].payload));
+                double y = convertDouble((*(uint64_t*)l->list[1].payload));
+                double z = convertDouble((*(uint64_t*)l->list[2].payload));
+                printf("Pos: (x: %f,y: %f,z: %f)\n",x,y,z);
+            }
+        }
+    }
+
+    destroyTag(&t);
+    munmap(mappedFile,sb.st_size);
+    close(fd);
+    return 0;
+}
+
+int main(int argc, char** argv) {
+    if(argc != 2) {
+        fprintf(stderr,"No file specified\n");
+        return 1;
+    }
+
+    if(access(argv[1],R_OK) == -1) {
+        perror("Can't access file");
+        return 2;
+    }
+
+    return parseMCPlayerFile(argv[1]);
+}
\ No newline at end of file
--
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