use a proper logger

.gitignore

@@ -1 +1,2 @@
 .ruff_cache
+*.log

README.md

@@ -9,10 +9,10 @@ disk image.
 
 ## Patchers
 - `patchers/b2spatch.ts`: Convert from BemaniPatcher to Spice2x JSON
-    - Use Deno: `deno run -WNE b2spatch.ts ...`
+    - Use Deno: `deno run -A b2spatch.ts ...`
     - You will need to rename the resulting JSON manually so that they match the
     `{gameCode}-{timestamp}_{entrypoint}` format expected by Spice2x.
-- `patchers/b2mpatch.ts`: Convert from BemaniPatcher to [mempatch-hook](https://github.com/djhackersdev/bemanitools/blob/master/doc/tools/mempatch-hook.md)
+- `patchers/b2mpatch.ts`: Convert from BemaniPatcher to [mempatch-hook](https://github.com/djhackersdev/bemanitools/blob/master/doc/tools/mempatch-hook.md)/[mempatcher](https://github.com/aixxe/mempatcher)
     - Use Deno: `deno run -A b2mpatch.ts ...`
     - You need to setup a folder of executables or DLLs you want to patch. They
     can be named the patcher's description, or the patcher's filename.

patchers/b2mpatch.ts

@@ -1,11 +1,15 @@
+import { Buffer } from "node:buffer";
 import { existsSync, readFileSync, writeFileSync } from "node:fs";
 import process from "node:process";
 import path from "node:path";
+import { CreateLogger } from "npm:mei-logger";
 import PE from "npm:pe-parser";
 import type { PEFile } from "npm:pe-parser/parser";
 import sanitize from "npm:sanitize-filename";
 import { bytesToHex, parsePatcherHtml } from "./_parser.ts";
 
+const logger = CreateLogger("b2mpatch");
+
 function fileOffsetToRVA(pe: PEFile, offset: number) {
     for (const section of pe.sections) {
         if (
@@ -45,32 +49,46 @@ async function main() {
             executableDir,
             sanitize(patcher.description) + path.extname(patcher.fname),
         );
+        let useFileOffsets = false;
 
         if (!existsSync(exePath)) {
-            console.warn(
+            logger.warn(
                 `Target file ${exePath} does not exist, falling back to ${patcher.fname}.`,
             );
             exePath = path.join(executableDir, patcher.fname);
         }
 
         if (!existsSync(exePath)) {
-            console.warn(`Target file ${exePath} does not exist, skipping.`);
-            continue;
+            logger.warn(`Target file ${exePath} does not exist, using file offsets instead (requires gh:aixxe/mempatcher).`);
+            useFileOffsets = true;
+        }
+
+        let data: Buffer | null = null;
+        let pe: PEFile | null = null;
+
+        if (!useFileOffsets) {
+            data = readFileSync(exePath);
+            pe = await PE.Parse(data);
         }
 
-        const data = readFileSync(exePath);
-        const pe = await PE.Parse(data);
         let mempatch = `# ${patcher.fname} ${patcher.description}\n\n`;
 
         for (const patch of patcher.patches) {
             if (patch.type !== undefined && patch.type !== "union") {
-                console.warn(
+                logger.warn(
                     `Unsupported BemaniPatcher patch type ${patch.type}`,
                     patch,
                 );
                 continue;
             }
 
+            if (patch.type === "union" && !data) {
+                logger.warn(
+                    `Union patch requires file data, skipping.`, patch,
+                );
+                continue;
+            }
+
             mempatch += `# ${patch.name}\n`;
 
             if (patch.tooltip) {
@@ -90,7 +108,7 @@ async function main() {
                     const up = p as { name: string; patch: number[] };
 
                     on = bytesToHex(up.patch);
-                    off = data
+                    off = data!
                         .subarray(
                             patch.offset,
                             patch.offset + up.patch.length,
@@ -111,8 +129,13 @@ async function main() {
 
                     on = bytesToHex(sp.on);
                     off = bytesToHex(sp.off);
-                    offset = fileOffsetToRVA(pe, sp.offset).toString(16)
-                        .toUpperCase();
+
+                    if (useFileOffsets) {
+                        offset = "F+" + sp.offset.toString(16).toUpperCase();
+                    } else {
+                        offset = fileOffsetToRVA(pe, sp.offset).toString(16)
+                            .toUpperCase();
+                    }
                 }
 
                 if (patch.type === "union" && on === off) {

patchers/b2spatch.ts

@@ -8,6 +8,7 @@
 import { readFileSync, writeFileSync } from "node:fs";
 import path from "node:path";
 import process from "node:process";
+import { CreateLogger } from "npm:mei-logger";
 import { bytesToHex, parsePatcherHtml } from "./_parser.ts";
 import type {
     BemaniPatch,
@@ -19,6 +20,8 @@ import type {
     SpiceUnionPatch,
 } from "./_types.ts";
 
+const logger = CreateLogger("b2spatch");
+
 function convertToSpicePatch(
     bmPatch: BemaniPatch,
     gameCode: string,
@@ -69,7 +72,7 @@ function convertToSpicePatch(
             // Technically you can match BemaniPatcher's DynamicPatch type to
             // Spice's signature patch, but one DynamicPatch can have multiple signatures,
             // while Spice only supports one signature per patch.
-            console.warn(
+            logger.warn(
                 `Unsupported BemaniPatcher patch type ${bmPatch.type}`,
                 bmPatch,
             );
@@ -90,7 +93,7 @@ function convertToSpicePatch(
 async function main() {
     if (process.argv.length < 4) {
         console.log(
-            "Usage: deno run -WNE b2spatch.ts <patcher URL | local patcher HTML> <gameCode> [output dir]",
+            "Usage: deno run -A b2spatch.ts <patcher URL | local patcher HTML> <gameCode> [output dir]",
         );
         process.exit(1);
     }