[Infineon][SVE] Fix CYW30739 KVS read/write methods. (#21742)

* Write methods should copy data to RAM before calling the platform API
  which doesn't support writing data from the flash.
* Read methods should return CHIP_ERROR_BUFFER_TOO_SMALL if the
  specified entry exists but the given buffer size is zero.

src/platform/CYW30739/CYW30739Config.cpp

@@ -23,6 +23,7 @@
 /* this file behaves like a config.h, comes first */
 #include <platform/internal/CHIPDeviceLayerInternal.h>
 
+#include <hal/wiced_hal_eflash.h>
 #include <platform/CYW30739/CYW30739Config.h>
 #include <platform_nvram.h>
 
@@ -78,12 +79,7 @@ template CHIP_ERROR CYW30739Config::ReadConfigValue(Key key, uint64_t & val);
 template <typename T>
 CHIP_ERROR CYW30739Config::WriteConfigValue(Key key, T val)
 {
-    wiced_result_t result;
-    uint16_t write_count = wiced_hal_write_nvram(PLATFORM_NVRAM_VSID_MATTER_BASE + key, sizeof(val), (uint8_t *) &val, &result);
-    if (result == WICED_SUCCESS && write_count == sizeof(val))
-        return CHIP_NO_ERROR;
-    else
-        return CHIP_DEVICE_ERROR_CONFIG_NOT_FOUND;
+    return WriteConfigValueBin(key, &val, sizeof(val));
 }
 
 template CHIP_ERROR CYW30739Config::WriteConfigValue(Key key, bool val);
@@ -111,6 +107,22 @@ CHIP_ERROR CYW30739Config::WriteConfigValueBin(Key key, const void * data, size_
     if (dataLen == 0)
         return CHIP_NO_ERROR;
 
+    if (IsDataFromFlash(data))
+    {
+        /*
+         * Copy data to RAM before calling the platform API
+         * which doesn't support writing data from the flash.
+         */
+        using namespace chip::Platform;
+        std::unique_ptr<void, decltype(&MemoryFree)> buffer(MemoryAlloc(dataLen), &MemoryFree);
+        if (!buffer)
+        {
+            return CHIP_ERROR_NO_MEMORY;
+        }
+        memcpy(buffer.get(), data, dataLen);
+        return WriteConfigValueBin(key, buffer.get(), dataLen);
+    }
+
     wiced_result_t result;
     const uint16_t write_count = wiced_hal_write_nvram(PLATFORM_NVRAM_VSID_MATTER_BASE + key, dataLen, (uint8_t *) data, &result);
     if (result == WICED_SUCCESS && write_count == dataLen)
@@ -147,6 +159,11 @@ CHIP_ERROR CYW30739Config::FactoryResetConfig(void)
 
 void CYW30739Config::RunConfigUnitTest(void) {}
 
+bool CYW30739Config::IsDataFromFlash(const void * data)
+{
+    return reinterpret_cast<void *>(FLASH_BASE_ADDRESS) <= data && data < reinterpret_cast<void *>(FLASH_BASE_ADDRESS + FLASH_SIZE);
+}
+
 } // namespace Internal
 } // namespace DeviceLayer
 } // namespace chip

src/platform/CYW30739/CYW30739Config.h

@@ -110,6 +110,9 @@ class CYW30739Config
     static bool ConfigValueExists(Key key);
     static CHIP_ERROR FactoryResetConfig(void);
     static void RunConfigUnitTest(void);
+
+private:
+    static bool IsDataFromFlash(const void * data);
 };
 
 } // namespace Internal

src/platform/CYW30739/KeyValueStoreManagerImpl.cpp

@@ -82,6 +82,7 @@ CHIP_ERROR KeyValueStoreManagerImpl::_Get(const char * key, void * value, size_t
 
     entry = FindEntry(key);
     VerifyOrExit(entry != nullptr, err = CHIP_ERROR_PERSISTED_STORAGE_VALUE_NOT_FOUND);
+    VerifyOrExit(value_size != 0, err = CHIP_ERROR_BUFFER_TOO_SMALL);
 
     size_t byte_count;
     err = CYW30739Config::ReadConfigValueBin(entry->GetValueConfigKey(), value, value_size, byte_count);