Assets downloader

utils/assets-downloader/.gitignore

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+# XMake
+build/
+.xmake/
+
+# Assets
+assets/
+*.data

utils/assets-downloader/README.md

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+## About assets
+
+The game itself downloads (through the launcher) further resources from
+
+```text
+https://resources.download.minecraft.net/
+```
+
+> ⚠️ http://resources.download.minecraft.net/ no longer works - you must use https
+
+The asset index for each version is linked in the `<version>.json`. An example url to the asset index could look like this
+
+```text
+https://launchermeta.mojang.com/mc/assets/1.12/67e29e024e664064c1f04c728604f83c24cbc218/1.12.json
+```
+
+Each resource in the file has a name (the field name of the resource object), a SHA1 hash, and a file size. The client currently downloads all resources in the index from
+
+```text
+https://resources.download.minecraft.net/<first 2 hex letters of hash>/<whole hash>
+```
+
+and stores them in
+
+```text
+.minecraft/assets/objects/<first 2 hex letters of hash>/<whole hash>
+```
+
+and a copy is stored in
+
+```text
+.minecraft/assets/virtual/legacy/ 
+```
+
+in the old format for versions that don't support the new system (1.7 and below)
+
+ℹ️ From: https://wiki.vg/Game_files#Assets

utils/assets-downloader/compile.sh

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+#!/bin/sh
+
+# build utility
+echo "Build: assets-x86_64-linux.data"
+base64 -w 0 build/linux/x86_64/release/assets-parser > assets-x86_64-linux.data
+echo "Build complete"

utils/assets-downloader/download-assets.sh

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+#!/bin/sh
+
+UTILITY=$(mktemp)
+base64 -d assets-x86_64-linux.data > $UTILITY
+chmod +x $UTILITY
+
+ASSETS=$($UTILITY assets/indexes/1.19.json)
+FILES=$(echo "$ASSETS" | wc -w)
+ASSETS_DIR=assets/objects
+
+mkdir -p $ASSETS_DIR
+
+FILE_COUNTER=0
+for FILE in $ASSETS
+do
+    HASH=$(echo $FILE | cut -d ":" -f 1)
+    SIZE=$(echo $FILE | cut -d ":" -f 2)
+
+    HASH_DIR=$ASSETS_DIR/${HASH:0:2}
+    mkdir -p $HASH_DIR
+
+    if ! [ -f $HASH_DIR/$HASH ]; then
+      curl --silent -o $HASH_DIR/$HASH "https://resources.download.minecraft.net/${HASH:0:2}/$HASH"
+    fi
+
+    FILE_SIZE=$(wc -c $HASH_DIR/$HASH | cut -d " " -f 1)
+    if (( $FILE_SIZE != $SIZE )); then
+        rm $HASH_DIR/$HASH
+        echo "Error download: $HASH"
+    fi
+
+    FILE_COUNTER=$(($FILE_COUNTER + 1))
+    echo -e "Progress: $FILE_COUNTER/$FILES"
+done

utils/assets-downloader/src/main.c

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+#include <stdio.h>
+#include <string.h>
+
+#include <cjson/cJSON.h>
+
+#define VERSION "0.0.0"
+
+int main(int argc, char const *argv[]) {
+  // printf("Assets Downloader for Minecraft Batch Launcher %s\n", VERSION);
+
+  if (argc < 2) {
+    printf("Usage: %s <assets.json>\n", argv[0]);
+
+    return 0;
+  }
+
+  /* ... */
+  if (argc == 2 && strcmp(argv[1], "--help") == 0) {
+    printf("Help:\n");
+    printf("  --help\tShow help\n");
+    printf("  --version\tShow version\n");
+    return 0;
+  } else if (argc == 2 && strcmp(argv[1], "--version") == 0) {
+    return 0;
+  }
+
+  FILE *index_file;
+  char str[900000];
+  char buffer[100];
+
+  index_file = fopen(argv[1], "r");
+  while (fgets(buffer, sizeof(buffer), index_file)) {
+    strcat(str, buffer);
+  }
+  fclose(index_file);
+
+  cJSON *json = cJSON_Parse(str);
+  cJSON *assets_objects = cJSON_GetObjectItem(json, "objects");
+  unsigned int assets_objects_size = cJSON_GetArraySize(assets_objects);
+
+  if (assets_objects) {
+    cJSON *object = assets_objects->child;
+
+    while (object) {
+      char *hash = cJSON_GetStringValue(cJSON_GetObjectItem(object, "hash"));
+      unsigned int size =
+          cJSON_GetNumberValue(cJSON_GetObjectItem(object, "size"));
+      printf("%s:%d\n", hash, size);
+
+      object = object->next;
+    }
+  }
+
+  return 0;
+}

utils/assets-downloader/xmake.lua

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+set_project("assets-parser")
+set_languages("c99")
+add_rules("mode.debug", "mode.release")
+
+toolchain("tcc")
+    set_kind("standalone")
+    set_toolset("cc", "tcc")
+    set_toolset("ld", "tcc")
+toolchain_end()
+
+if is_mode("debug") then
+    set_symbols("debug")
+    set_optimize("none")
+end
+
+set_toolchains("tcc")
+
+add_requires("cjson 1.7.15")
+
+target("assets-parser")
+    set_kind("binary")
+    add_files("src/*.c")
+    add_packages("cjson")
+
+    after_build(function (target)
+        -- os.exec("base64 -w 0 build/linux/x86_64/release/assets-parser > assets-x86_64-linux.data")
+        os.exec("./compile.sh")
+    end)