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@@ -0,0 +1,103 @@
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+/**
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+ * Copyright (c) 2011-2022 Bill Greiman
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+ *
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+ * This file is part of the SdFat library for SD memory cards.
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+ *
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+ * MIT License
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a
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+ * copy of this software and associated documentation files (the "Software"),
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+ * to deal in the Software without restriction, including without limitation
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+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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+ * and/or sell copies of the Software, and to permit persons to whom the
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+ * Software is furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included
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+ * in all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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+ * DEALINGS IN THE SOFTWARE.
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+ */
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+
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+#include "PartitionTable.h"
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+#include "DebugMacros.h"
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+#include "FsStructs.h"
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+
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+// Read MBR format partition table, retrieve the start sector number of a volume
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+static uint32_t partitionTableGetVolumeStartSectorMBR(FsCache& fscache, uint8_t part)
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+{
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+ if (part <= 0 || part > 4) {
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+ DBG_FAIL_MACRO;
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+ return 0;
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+ }
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+
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+ const uint8_t *sector = fscache.prepare(0, FsCache::CACHE_FOR_READ);
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+ const MbrSector_t *mbr = reinterpret_cast<const MbrSector_t*>(sector);
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+ if (!mbr) {
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+ DBG_FAIL_MACRO;
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+ return 0;
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+ }
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+
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+ const MbrPart_t *mp = mbr->part + part - 1;
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+ if (mp->type == 0 || getLe32(mp->totalSectors) == 0) {
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+ DBG_FAIL_MACRO;
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+ return 0;
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+ }
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+
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+ return getLe32(mp->relativeSectors);
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+}
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+
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+// Read GPT format partition table, retrieve the start sector number of a volume
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+static uint32_t partitionTableGetVolumeStartSectorGPT(FsCache& fscache, uint8_t part)
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+{
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+ if (part <= 0 || part > 4) {
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+ DBG_FAIL_MACRO;
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+ return 0;
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+ }
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+
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+ const uint8_t *sector = fscache.prepare(1, FsCache::CACHE_FOR_READ);
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+ const GPT_Header_t *gpt = reinterpret_cast<const GPT_Header_t*>(sector);
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+
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+ if (getLe64(gpt->signature) != 0x5452415020494645ULL) {
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+ DBG_FAIL_MACRO;
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+ return 0;
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+ }
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+
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+ // First 4 partition table entries are in LBA 2
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+ sector = fscache.prepare(2, FsCache::CACHE_FOR_READ);
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+ const GPT_PartitionEntry_t *partentry =
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+ reinterpret_cast<const GPT_PartitionEntry_t*>(sector + 128 * (part - 1));
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+
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+ uint64_t startSector = getLe64(partentry->first_lba);
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+ uint32_t startSector32 = static_cast<uint32_t>(startSector);
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+ if (startSector32 != startSector)
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+ {
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+ // Currently limited to 2^32 sectors = 2 TB by other parts of SdFat code.
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+ DBG_FAIL_MACRO;
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+ return 0;
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+ }
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+
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+ return startSector32;
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+}
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+
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+uint32_t partitionTableGetVolumeStartSector(FsCache& fscache, uint8_t part)
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+{
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+ uint32_t start;
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+
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+ // Check for GPT partition table first, because it has clearly identifiable
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+ // signature. It is also common for GPT-partitioned drives to have MBR-style
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+ // fallback boot record at the start.
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+ start = partitionTableGetVolumeStartSectorGPT(fscache, part);
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+
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+ if (start == 0)
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+ {
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+ start = partitionTableGetVolumeStartSectorMBR(fscache, part);
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+ }
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+
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+ return start;
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+}
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Petteri Aimonen