1 files changed, 91 insertions, 0 deletions
diff --git a/src/tools/wasmdeployqt/wasmbinary.cpp b/src/tools/wasmdeployqt/wasmbinary.cpp
new file mode 100644
index 00000000000..1a041c94066
--- /dev/null
+++ b/src/tools/wasmdeployqt/wasmbinary.cpp
@@ -0,0 +1,91 @@
+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "wasmbinary.h"
+
+#include <QFile>
+
+#include <iostream>
+
+WasmBinary::WasmBinary(QString filepath)
+{
+    QFile file(filepath);
+    if (!file.open(QIODevice::ReadOnly)) {
+        std::cout << "ERROR: Cannot open the file " << filepath.toStdString() << std::endl;
+        std::cout << file.errorString().toStdString() << std::endl;
+        type = WasmBinary::Type::INVALID;
+        return;
+    }
+    auto bytes = file.readAll();
+    if (!parsePreambule(bytes)) {
+        type = WasmBinary::Type::INVALID;
+    }
+}
+
+bool WasmBinary::parsePreambule(QByteArrayView data)
+{
+    const auto preambuleSize = 24;
+    if (data.size() < preambuleSize) {
+        std::cout << "ERROR: Preambule of binary shorter than expected!" << std::endl;
+        return false;
+    }
+    uint32_t int32View[6];
+    std::memcpy(int32View, data.data(), sizeof(int32View));
+    if (int32View[0] != 0x6d736100) {
+        std::cout << "ERROR: Magic WASM number not found in binary. Binary corrupted?" << std::endl;
+        return false;
+    }
+    if (data[8] != 0) {
+        type = WasmBinary::Type::STATIC;
+        return true;
+    } else {
+        type = WasmBinary::Type::SHARED;
+    }
+    const auto sectionStart = 9;
+    size_t offset = sectionStart;
+    auto sectionSize = getLeb(data, offset);
+    auto sectionEnd = sectionStart + sectionSize;
+    auto name = getString(data, offset);
+    if (name != "dylink.0") {
+        type = WasmBinary::Type::INVALID;
+        std::cout << "ERROR: dylink.0 was not found in supposedly dynamically linked module"
+                  << std::endl;
+        return false;
+    }
+
+    const auto WASM_DYLINK_NEEDED = 0x2;
+    while (offset < sectionEnd) {
+        auto subsectionType = data[offset++];
+        auto subsectionSize = getLeb(data, offset);
+        if (subsectionType == WASM_DYLINK_NEEDED) {
+            auto neededDynlibsCount = getLeb(data, offset);
+            while (neededDynlibsCount--) {
+                dependencies.append(getString(data, offset));
+            }
+        } else {
+            offset += subsectionSize;
+        }
+    }
+    return true;
+}
+
+size_t WasmBinary::getLeb(QByteArrayView data, size_t &offset)
+{
+    auto ret = 0;
+    auto mul = 1;
+    while (true) {
+        auto byte = data[offset++];
+        ret += (byte & 0x7f) * mul;
+        mul *= 0x80;
+        if (!(byte & 0x80))
+            break;
+    }
+    return ret;
+}
+
+QString WasmBinary::getString(QByteArrayView data, size_t &offset)
+{
+    auto length = getLeb(data, offset);
+    offset += length;
+    return QString::fromUtf8(data.sliced(offset - length, length));
+}