/* * bktr.h * * Copyright (c) 2018-2020, SciresM. * Copyright (c) 2020-2022, DarkMatterCore . * * This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool). * * nxdumptool is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * nxdumptool is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #pragma once #ifndef __BKTR_H__ #define __BKTR_H__ #include "nca.h" #ifdef __cplusplus extern "C" { #endif #define BKTR_NODE_HEADER_SIZE 0x10 #define BKTR_NODE_SIZE 0x4000 /* Currently shared by all Bucket Tree storage types. */ #define BKTR_NODE_SIZE_MIN 0x400 #define BKTR_NODE_SIZE_MAX 0x80000 #define BKTR_INDIRECT_ENTRY_SIZE 0x14 #define BKTR_AES_CTR_EX_ENTRY_SIZE 0x10 #define BKTR_COMPRESSED_ENTRY_SIZE 0x18 #define BKTR_COMPRESSION_PHYS_ALIGNMENT 0x10 #define BKTR_COMPRESSION_LEVEL_MIN 0 #define BKTR_COMPRESSION_LEVEL_MAX 16 #define BKTR_COMPRESSION_LEVEL_DEFAULT BKTR_COMPRESSION_LEVEL_MIN #define BKTR_COMPRESSION_INVALID_PHYS_SIZE UINT32_MAX #define BKTR_MAX_SUBSTORAGE_COUNT 2 /// Used as the header for both BucketTreeOffsetNode and BucketTreeEntryNode. typedef struct { u32 index; ///< BucketTreeOffsetNode / BucketTreeEntryNode index. u32 count; ///< BucketTreeHeader: BucketTreeEntryNode count. BucketTreeEntryNode: entry count. u64 offset; ///< Usually represents a physical or virtual size. } BucketTreeNodeHeader; NXDT_ASSERT(BucketTreeNodeHeader, BKTR_NODE_HEADER_SIZE); /// First segment of every BucketTreeTable. typedef struct { BucketTreeNodeHeader header; u64 offsets[0x7FE]; ///< May represent virtual or physical offsets, depending on the storage type. } BucketTreeOffsetNode; NXDT_ASSERT(BucketTreeOffsetNode, BKTR_NODE_SIZE); /// IndirectStorage-related elements. typedef enum { BucketTreeIndirectStorageIndex_Original = 0, BucketTreeIndirectStorageIndex_Patch = 1 } BucketTreeIndirectStorageIndex; #pragma pack(push, 1) typedef struct { u64 virtual_offset; u64 physical_offset; u32 storage_index; ///< BucketTreeIndirectStorageIndex. } BucketTreeIndirectStorageEntry; #pragma pack(pop) NXDT_ASSERT(BucketTreeIndirectStorageEntry, BKTR_INDIRECT_ENTRY_SIZE); /// AesCtrExStorage-related elements. typedef enum { BucketTreeAesCtrExStorageEncryption_Enabled = 0, BucketTreeAesCtrExStorageEncryption_Disabled = 1 } BucketTreeAesCtrExStorageEncryption; typedef struct { u64 offset; u8 encryption; ///< BucketTreeAesCtrExStorageEncryption. u8 reserved[0x3]; u32 generation; } BucketTreeAesCtrExStorageEntry; NXDT_ASSERT(BucketTreeAesCtrExStorageEntry, BKTR_AES_CTR_EX_ENTRY_SIZE); /// CompressedStorage-related elements. typedef enum { BucketTreeCompressedStorageCompressionType_None = 0, BucketTreeCompressedStorageCompressionType_Zero = 1, BucketTreeCompressedStorageCompressionType_2 = 2, BucketTreeCompressedStorageCompressionType_LZ4 = 3 } BucketTreeCompressedStorageCompressionType; typedef struct { s64 virtual_offset; s64 physical_offset; ///< Must be aligned to BKTR_COMPRESSION_PHYS_ALIGNMENT. u8 compression_type; ///< BucketTreeCompressedStorageCompressionType. s8 compression_level; ///< Must be within the range [BKTR_COMPRESSION_LEVEL_MIN, BKTR_COMPRESSION_LEVEL_MAX]. u8 reserved[0x2]; u32 physical_size; ///< Compressed data size. } BucketTreeCompressedStorageEntry; NXDT_ASSERT(BucketTreeCompressedStorageEntry, BKTR_COMPRESSED_ENTRY_SIZE); /// Second segment of every BucketTreeTable. At least one entry node must be available. typedef struct { BucketTreeNodeHeader header; union { struct { BucketTreeIndirectStorageEntry indirect_entries[0x332]; u8 reserved[0x8]; }; BucketTreeAesCtrExStorageEntry aes_ctr_ex_entries[0x3FF]; BucketTreeCompressedStorageEntry compressed_entries[0x2AA]; }; } BucketTreeEntryNode; NXDT_ASSERT(BucketTreeEntryNode, BKTR_NODE_SIZE); typedef struct { BucketTreeOffsetNode offset_node; BucketTreeEntryNode entry_nodes[]; ///< Number of nodes can be retrieved from offset_node.header.count. } BucketTreeTable; NXDT_ASSERT(BucketTreeTable, BKTR_NODE_SIZE); typedef enum { BucketTreeStorageType_Indirect = 0, ///< Uses two substorages: index 0 (points to the base NCA) and index 1 (AesCtrEx storage). ///< All reads within storage index 0 use the calculated physical offsets for data decryption. BucketTreeStorageType_AesCtrEx = 1, ///< Used as storage index 1 for BucketTreeStorageType_Indirect. BucketTreeStorageType_Compressed = 2, ///< Uses LZ4-compressed sections. BucketTreeStorageType_Sparse = 3, ///< BucketTreeStorageType_Indirect with a twist. Storage index 0 points to the same NCA, and uses virtual offsets for data decryption. ///< Zero-filled output is used for any reads within storage index 1. BucketTreeStorageType_Count = 4 ///< Total values supported by this enum. } BucketTreeStorageType; typedef enum { BucketTreeSubStorageType_Regular = 0, ///< Body storage with None, XTS or CTR crypto. Most common substorage type, used in all title types. ///< May be used as substorage for all other BucketTreeStorage types. BucketTreeSubStorageType_Indirect = 1, ///< Indirect storage. Only used in patches. This is always the outmost storage type. BucketTreeSubStorageType_AesCtrEx = 2, ///< AesCtrEx storage. Only used in patches. Must be used as substorage #1 for BucketTreeStorageType_Indirect. BucketTreeSubStorageType_Compressed = 3, ///< Compressed storage. Only used in base applications. If available, this is always the outmost storage type. ///< May be used as substorage #0 for BucketTreeStorageType_Indirect only. BucketTreeSubStorageType_Sparse = 4, ///< Sparse storage with CTR crypto, using virtual offsets as lower CTR IVs. Only used in base applications. ///< May be used as substorage for BucketTreeStorageType_Compressed or BucketTreeStorageType_Indirect (#0). BucketTreeSubStorageType_Count = 5 ///< Total values supported by this enum. } BucketTreeSubStorageType; typedef struct { u8 index; ///< Substorage index. NcaFsSectionContext *nca_fs_ctx; ///< NCA FS section context. Used to perform operations on the target NCA. u8 type; ///< BucketTreeSubStorageType. void *bktr_ctx; ///< BucketTreeContext related to this storage. Only used if type > BucketTreeSubStorageType_Regular. } BucketTreeSubStorage; typedef struct { NcaFsSectionContext *nca_fs_ctx; ///< NCA FS section context. Used to perform operations on the target NCA. u8 storage_type; ///< BucketTreeStorageType. BucketTreeTable *storage_table; ///< Pointer to the dynamically allocated Bucket Tree Table for this storage. u64 node_size; ///< Node size for this type of Bucket Tree storage. u64 entry_size; ///< Size of each individual entry within BucketTreeEntryNode. u32 offset_count; ///< Number of offsets available within each BucketTreeOffsetNode for this storage. u32 entry_set_count; ///< Number of BucketTreeEntryNode elements available in this storage. u64 node_storage_size; ///< Offset node segment size within 'storage_table'. u64 entry_storage_size; ///< Entry node segment size within 'storage_table'. u64 start_offset; ///< Virtual storage start offset. u64 end_offset; ///< Virtual storage end offset. BucketTreeSubStorage substorages[BKTR_MAX_SUBSTORAGE_COUNT]; ///< Substorages required for this BucketTree storage. May be set after initializing this context. } BucketTreeContext; /// Initializes a Bucket Tree context using the provided NCA FS section context and a storage type. bool bktrInitializeContext(BucketTreeContext *out, NcaFsSectionContext *nca_fs_ctx, u8 storage_type); /// Sets a BucketTreeSubStorageType_Regular substorage at index 0. bool bktrSetRegularSubStorage(BucketTreeContext *ctx, NcaFsSectionContext *nca_fs_ctx); /// Sets a substorage with type >= BucketTreeStorageType_Indirect and <= BucketTreeStorageType_Compressed at the provided index using a previously initialized BucketTreeContext. bool bktrSetBucketTreeSubStorage(BucketTreeContext *parent_ctx, BucketTreeContext *child_ctx, u8 substorage_index); /// Reads data from a Bucket Tree storage using a previously initialized BucketTreeContext. bool bktrReadStorage(BucketTreeContext *ctx, void *out, u64 read_size, u64 offset); /// Checks if the provided block extents are within the provided BucketTreeContext's Indirect Storage. bool bktrIsBlockWithinIndirectStorageRange(BucketTreeContext *ctx, u64 offset, u64 size, bool *out); /// Helper inline functions. NX_INLINE void bktrFreeContext(BucketTreeContext *ctx) { if (!ctx) return; if (ctx->storage_table) free(ctx->storage_table); memset(ctx, 0, sizeof(BucketTreeContext)); } NX_INLINE bool bktrIsValidContext(BucketTreeContext *ctx) { return (ctx && ctx->nca_fs_ctx && ctx->storage_type < BucketTreeStorageType_Count && ctx->storage_table && ctx->node_size && ctx->entry_size && ctx->offset_count && \ ctx->entry_set_count && ctx->node_storage_size && ctx->entry_storage_size && ctx->end_offset > ctx->start_offset); } NX_INLINE bool bktrIsOffsetWithinStorageRange(BucketTreeContext *ctx, u64 offset) { return (bktrIsValidContext(ctx) && ctx->start_offset <= offset && offset < ctx->end_offset); } NX_INLINE bool bktrIsBlockWithinStorageRange(BucketTreeContext *ctx, u64 size, u64 offset) { return (bktrIsValidContext(ctx) && size > 0 && ctx->start_offset <= offset && size <= (ctx->end_offset - offset)); } NX_INLINE bool bktrIsValidSubstorage(BucketTreeSubStorage *substorage) { return (substorage && substorage->index < BKTR_MAX_SUBSTORAGE_COUNT && substorage->nca_fs_ctx && substorage->type < BucketTreeSubStorageType_Count && \ ((substorage->type == BucketTreeSubStorageType_Regular && substorage->index == 0 && !substorage->bktr_ctx) || \ (substorage->type > BucketTreeSubStorageType_Regular && substorage->bktr_ctx))); } #ifdef __cplusplus } #endif #endif /* __BKTR_H__ */