Host / Chassis (Windows): parse SMBIOS data directly

src/util/smbiosHelper.c

@@ -47,4 +47,22 @@ void ffGetSmbiosValue(const char* devicesPath, const char* classPath, FFstrbuf*
 
     ffStrbufClear(buffer);
 }
+#elif defined(_WIN32)
+#include <windows.h>
+
+#pragma GCC diagnostic ignored "-Wmultichar"
+
+const FFRawSmbiosData* ffGetSmbiosData()
+{
+    static FFRawSmbiosData* buffer;
+    if (!buffer)
+    {
+        const DWORD signature = 'RSMB';
+        uint32_t bufSize = GetSystemFirmwareTable(signature, 0, NULL, 0);
+        assert(bufSize > sizeof(FFRawSmbiosData));
+        buffer = (FFRawSmbiosData*) malloc(bufSize);
+        GetSystemFirmwareTable(signature, 0, buffer, bufSize);
+    }
+    return buffer;
+}
 #endif

src/util/smbiosHelper.h

@@ -14,6 +14,66 @@ static inline void ffCleanUpSmbiosValue(FFstrbuf* value)
 
 #ifdef __linux__
 void ffGetSmbiosValue(const char* devicesPath, const char* classPath, FFstrbuf* buffer);
+#elif defined(_WIN32)
+// https://github.com/KunYi/DumpSMBIOS
+// https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.7.0.pdf
+
+typedef enum __attribute__((__packed__)) FFSmbiosType // : uint8_t
+{
+    FF_SMBIOS_TYPE_BIOS = 0,
+    FF_SMBIOS_TYPE_SYSTEM_INFO = 1,
+    FF_SMBIOS_TYPE_BASEBOARD_INFO = 2,
+    FF_SMBIOS_TYPE_SYSTEM_ENCLOSURE = 3,
+    FF_SMBIOS_TYPE_PROCESSOR_INFO = 4,
+    FF_SMBIOS_TYPE_MEMORY_MODULE_INFO = 6,
+    FF_SMBIOS_TYPE_CACHE_INFO = 7,
+    FF_SMBIOS_TYPE_OEM_STRING = 11,
+    FF_SMBIOS_TYPE_MEMORY_DEVICE = 17,
+    FF_SMBIOS_TYPE_MEMORY_ARRAY_MAPPED_ADDRESS = 19,
+    FF_SMBIOS_TYPE_BUILTIN_POINT_DEVICE = 21,
+    FF_SMBIOS_TYPE_PORTABLE_BATTERY = 22,
+    FF_SMBIOS_TYPE_LAST = 127,
+} FFSmbiosType;
+static_assert(sizeof(FFSmbiosType) == 1, "FFSmbiosType should be 1 byte");
+
+typedef struct FFSmbiosHeader
+{
+    FFSmbiosType Type;
+    uint8_t Length;
+    uint16_t Handle;
+    uint8_t Data[];
+} FFSmbiosHeader;
+static_assert(sizeof(FFSmbiosHeader) == 4, "FFSmbiosHeader should be 4 bytes");
+
+typedef struct FFRawSmbiosData
+{
+    uint8_t Used20CallingMethod;
+    uint8_t SMBIOSMajorVersion;
+    uint8_t SMBIOSMinorVersion;
+    uint8_t DmiRevision;
+    uint32_t Length;
+    uint8_t SMBIOSTableData[];
+} FFRawSmbiosData;
+
+static inline const char* ffSmbiosLocateString(const char* start, uint8_t index /* start from 1 */)
+{
+    if (index == 0 || *start == '\0')
+        return NULL;
+    while (--index)
+        start += strlen(start) + 1;
+    return start;
+}
+
+static inline const FFSmbiosHeader* ffSmbiosSkipLastStr(const FFSmbiosHeader* header)
+{
+    const char* p = ((const char*) header) + header->Length;
+    while (*p)
+        p += strlen(p) + 1;
+
+    return (const FFSmbiosHeader*) (p + 1);
+}
+
+const FFRawSmbiosData* ffGetSmbiosData();
 #endif
 
 #endif