/* * romfs.h * * Copyright (c) 2020-2021, 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 and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * nxdumptool is distributed in the hope 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 __ROMFS_H__ #define __ROMFS_H__ #include "nca.h" #define ROMFS_OLD_HEADER_SIZE 0x28 #define ROMFS_HEADER_SIZE 0x50 #define ROMFS_VOID_ENTRY 0xFFFFFFFF /// Header used by NCA0 RomFS sections. typedef struct { u32 header_size; ///< Header size. Must be equal to ROMFS_OLD_HEADER_SIZE. u32 directory_bucket_offset; ///< Directory buckets table offset. u32 directory_bucket_size; ///< Directory buckets table size. u32 directory_entry_offset; ///< Directory entries table offset. u32 directory_entry_size; ///< Directory entries table size. u32 file_bucket_offset; ///< File buckets table offset. u32 file_bucket_size; ///< File buckets table size. u32 file_entry_offset; ///< File entries table offset. u32 file_entry_size; ///< File entries table size. u32 body_offset; ///< File data body offset. } RomFileSystemInformationOld; /// Header used by NCA2/NCA3 RomFS sections. typedef struct { u64 header_size; ///< Header size. Must be equal to ROMFS_HEADER_SIZE. u64 directory_bucket_offset; ///< Directory buckets table offset. u64 directory_bucket_size; ///< Directory buckets table size. u64 directory_entry_offset; ///< Directory entries table offset. u64 directory_entry_size; ///< Directory entries table size. u64 file_bucket_offset; ///< File buckets table offset. u64 file_bucket_size; ///< File buckets table size. u64 file_entry_offset; ///< File entries table offset. u64 file_entry_size; ///< File entries table size. u64 body_offset; ///< File data body offset. } RomFileSystemInformation; /// Header union. typedef struct { union { struct { RomFileSystemInformationOld old_format; u8 padding[ROMFS_OLD_HEADER_SIZE]; }; RomFileSystemInformation cur_format; }; } RomFileSystemHeader; /// Directory entry. Always aligned to a 4-byte boundary past the directory name. typedef struct { u32 parent_offset; ///< Parent directory offset. u32 next_offset; ///< Next sibling directory offset. u32 directory_offset; ///< First child directory offset. u32 file_offset; ///< First child file offset. u32 bucket_offset; ///< Directory bucket offset. u32 name_length; ///< Name length. char name[]; ///< Name (UTF-8). } RomFileSystemDirectoryEntry; /// Directory entry. Always aligned to a 4-byte boundary past the file name. typedef struct { u32 parent_offset; ///< Parent directory offset. u32 next_offset; ///< Next sibling file offset. u64 offset; ///< File data offset. u64 size; ///< File data size. u32 bucket_offset; ///< File bucket offset. u32 name_length; ///< Name length. char name[]; ///< Name (UTF-8). } RomFileSystemFileEntry; typedef struct { NcaFsSectionContext *nca_fs_ctx; ///< Used to read NCA FS section data. u64 offset; ///< RomFS offset (relative to the start of the NCA FS section). u64 size; ///< RomFS size. RomFileSystemHeader header; ///< RomFS header. u64 dir_table_size; ///< RomFS directory entries table size. RomFileSystemDirectoryEntry *dir_table; ///< RomFS directory entries table. u64 file_table_size; ///< RomFS file entries table size. RomFileSystemFileEntry *file_table; ///< RomFS file entries table. u64 body_offset; ///< RomFS file data body offset (relative to the start of the RomFS). u32 cur_dir_offset; ///< Current RomFS directory offset (relative to the start of the directory entries table). Used for RomFS browsing. } RomFileSystemContext; typedef struct { bool use_old_format_patch; ///< Old format patch flag. bool written; ///< Set to true if the patch has been completely written. NcaHierarchicalSha256Patch old_format_patch; ///< Used with NCA0 RomFS sections. NcaHierarchicalIntegrityPatch cur_format_patch; ///< Used with NCA2/NCA3 RomFS sections. } RomFileSystemFileEntryPatch; typedef enum { RomFileSystemPathIllegalCharReplaceType_None = 0, RomFileSystemPathIllegalCharReplaceType_IllegalFsChars = 1, RomFileSystemPathIllegalCharReplaceType_KeepAsciiCharsOnly = 2 } RomFileSystemPathIllegalCharReplaceType; /// Initializes a RomFS context. bool romfsInitializeContext(RomFileSystemContext *out, NcaFsSectionContext *nca_fs_ctx); /// Reads raw filesystem data using a RomFS context. /// Input offset must be relative to the start of the RomFS. bool romfsReadFileSystemData(RomFileSystemContext *ctx, void *out, u64 read_size, u64 offset); /// Reads data from a previously retrieved RomFileSystemFileEntry using a RomFS context. /// Input offset must be relative to the start of the RomFS file entry data. bool romfsReadFileEntryData(RomFileSystemContext *ctx, RomFileSystemFileEntry *file_entry, void *out, u64 read_size, u64 offset); /// Calculates the extracted RomFS size. bool romfsGetTotalDataSize(RomFileSystemContext *ctx, u64 *out_size); /// Calculates the extracted size from a RomFS directory. bool romfsGetDirectoryDataSize(RomFileSystemContext *ctx, RomFileSystemDirectoryEntry *dir_entry, u64 *out_size); /// Retrieves a RomFS directory entry by path. /// Input path must have a leading slash ('/'). If just a single slash is provided, a pointer to the root directory entry shall be returned. RomFileSystemDirectoryEntry *romfsGetDirectoryEntryByPath(RomFileSystemContext *ctx, const char *path); /// Retrieves a RomFS file entry by path. /// Input path must have a leading slash ('/'). RomFileSystemFileEntry *romfsGetFileEntryByPath(RomFileSystemContext *ctx, const char *path); /// Generates a path string from a RomFS directory entry. bool romfsGeneratePathFromDirectoryEntry(RomFileSystemContext *ctx, RomFileSystemDirectoryEntry *dir_entry, char *out_path, size_t out_path_size, u8 illegal_char_replace_type); /// Generates a path string from a RomFS file entry. bool romfsGeneratePathFromFileEntry(RomFileSystemContext *ctx, RomFileSystemFileEntry *file_entry, char *out_path, size_t out_path_size, u8 illegal_char_replace_type); /// Generates HierarchicalSha256 (NCA0) / HierarchicalIntegrity (NCA2/NCA3) FS section patch data using a RomFS context + file entry, which can be used to seamlessly replace NCA data. /// Input offset must be relative to the start of the RomFS file entry data. /// This function shares the same limitations as ncaGenerateHierarchicalSha256Patch() / ncaGenerateHierarchicalIntegrityPatch(). /// Use the romfsWriteFileEntryPatchToMemoryBuffer() wrapper to write patch data generated by this function. bool romfsGenerateFileEntryPatch(RomFileSystemContext *ctx, RomFileSystemFileEntry *file_entry, const void *data, u64 data_size, u64 data_offset, RomFileSystemFileEntryPatch *out); /// Miscellaneous functions. NX_INLINE void romfsFreeContext(RomFileSystemContext *ctx) { if (!ctx) return; if (ctx->dir_table) free(ctx->dir_table); if (ctx->file_table) free(ctx->file_table); memset(ctx, 0, sizeof(RomFileSystemContext)); } NX_INLINE RomFileSystemDirectoryEntry *romfsGetDirectoryEntryByOffset(RomFileSystemContext *ctx, u32 dir_entry_offset) { if (!ctx || !ctx->dir_table || (dir_entry_offset + sizeof(RomFileSystemDirectoryEntry)) > ctx->dir_table_size) return NULL; return (RomFileSystemDirectoryEntry*)((u8*)ctx->dir_table + dir_entry_offset); } NX_INLINE RomFileSystemFileEntry *romfsGetFileEntryByOffset(RomFileSystemContext *ctx, u32 file_entry_offset) { if (!ctx || !ctx->file_table || (file_entry_offset + sizeof(RomFileSystemFileEntry)) > ctx->file_table_size) return NULL; return (RomFileSystemFileEntry*)((u8*)ctx->file_table + file_entry_offset); } NX_INLINE void romfsWriteFileEntryPatchToMemoryBuffer(RomFileSystemContext *ctx, RomFileSystemFileEntryPatch *patch, void *buf, u64 buf_size, u64 buf_offset) { if (!ctx || !ctx->nca_fs_ctx || !patch || (!patch->use_old_format_patch && ctx->nca_fs_ctx->section_type == NcaFsSectionType_Nca0RomFs) || \ (patch->use_old_format_patch && ctx->nca_fs_ctx->section_type != NcaFsSectionType_Nca0RomFs)) return; if (patch->use_old_format_patch) { ncaWriteHierarchicalSha256PatchToMemoryBuffer((NcaContext*)ctx->nca_fs_ctx->nca_ctx, &(patch->old_format_patch), buf, buf_size, buf_offset); patch->written = patch->old_format_patch.written; } else { ncaWriteHierarchicalIntegrityPatchToMemoryBuffer((NcaContext*)ctx->nca_fs_ctx->nca_ctx, &(patch->cur_format_patch), buf, buf_size, buf_offset); patch->written = patch->cur_format_patch.written; } } NX_INLINE void romfsFreeFileEntryPatch(RomFileSystemFileEntryPatch *patch) { if (!patch) return; ncaFreeHierarchicalSha256Patch(&(patch->old_format_patch)); ncaFreeHierarchicalIntegrityPatch(&(patch->cur_format_patch)); memset(patch, 0, sizeof(RomFileSystemFileEntryPatch)); } #endif /* __ROMFS_H__ */