[Oracle] Add low-memory check (<=4GiB) and use mtgxml url instead.

libcockatrice_utility/libcockatrice/utility/system_memory_querier.cpp

@@ -0,0 +1,107 @@
+#include "system_memory_querier.h"
+
+#ifdef Q_OS_WIN
+#include <windows.h>
+#endif
+
+#ifdef Q_OS_LINUX
+#include <QFile>
+#include <QTextStream>
+#endif
+
+#ifdef Q_OS_MACOS
+#include <mach/mach.h>
+#include <sys/sysctl.h>
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
+qulonglong SystemMemoryQuerier::totalMemoryBytes()
+{
+#if defined(Q_OS_WIN)
+
+    MEMORYSTATUSEX statex;
+    statex.dwLength = sizeof(statex);
+    if (GlobalMemoryStatusEx(&statex))
+        return statex.ullTotalPhys;
+    return 0;
+
+#elif defined(Q_OS_LINUX)
+
+    QFile file("/proc/meminfo");
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
+        return 0;
+
+    QTextStream in(&file);
+    while (!in.atEnd()) {
+        QString line = in.readLine();
+        if (line.startsWith("MemTotal:")) {
+            QStringList parts = line.split(QRegExp("\\s+"), Qt::SkipEmptyParts);
+            if (parts.size() >= 2)
+                return parts[1].toULongLong() * 1024; // kB → bytes
+        }
+    }
+    return 0;
+
+#elif defined(Q_OS_MACOS)
+
+    int mib[2] = {CTL_HW, HW_MEMSIZE};
+    qulonglong memsize = 0;
+    size_t len = sizeof(memsize);
+
+    if (sysctl(mib, 2, &memsize, &len, nullptr, 0) == 0)
+        return memsize;
+
+    return 0;
+
+#else
+    return 0;
+#endif
+}
+
+qulonglong SystemMemoryQuerier::availableMemoryBytes()
+{
+#if defined(Q_OS_WIN)
+
+    MEMORYSTATUSEX statex;
+    statex.dwLength = sizeof(statex);
+    if (GlobalMemoryStatusEx(&statex))
+        return statex.ullAvailPhys;
+    return 0;
+
+#elif defined(Q_OS_LINUX)
+
+    QFile file("/proc/meminfo");
+    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
+        return 0;
+
+    QTextStream in(&file);
+    while (!in.atEnd()) {
+        QString line = in.readLine();
+        if (line.startsWith("MemAvailable:")) {
+            QStringList parts = line.split(QRegExp("\\s+"), Qt::SkipEmptyParts);
+            if (parts.size() >= 2)
+                return parts[1].toULongLong() * 1024;
+        }
+    }
+    return 0;
+
+#elif defined(Q_OS_MACOS)
+
+    vm_size_t pageSize;
+    host_page_size(mach_host_self(), &pageSize);
+
+    mach_msg_type_number_t count = HOST_VM_INFO_COUNT;
+    vm_statistics64_data_t vmstat;
+
+    if (host_statistics64(mach_host_self(), HOST_VM_INFO, (host_info64_t)&vmstat, &count) != KERN_SUCCESS)
+        return 0;
+
+    qulonglong freeBytes = (qulonglong)vmstat.free_count * (qulonglong)pageSize;
+
+    return freeBytes;
+
+#else
+    return 0;
+#endif
+}