Add RomFS Building from directory to elf2nro (#5)

build_romfs, romfsdir support in elf2nro

Makefile.am

@@ -1,9 +1,11 @@
 # Makefile.am -- Process this file with automake to produce Makefile.in
-bin_PROGRAMS = elf2nso elf2nro build_pfs0 nacptool nxlink
+bin_PROGRAMS = elf2nso elf2nro build_pfs0 build_romfs nacptool nxlink
 
 build_pfs0_SOURCES	=	src/build_pfs0.c src/types.h
 
-elf2nro_SOURCES	=	src/elf2nro.c src/elf64.h src/elf_common.h
+build_romfs_SOURCES = src/build_romfs.c src/romfs.c src/romfs.h src/filepath.c src/filepath.h src/types.h
+
+elf2nro_SOURCES	=	src/elf2nro.c src/elf64.h src/romfs.c src/filepath.c src/filepath.h src/romfs.h src/elf_common.h
 
 elf2nso_SOURCES	=	src/elf2nso.c src/sha256.c src/sha256.h src/elf64.h src/elf_common.h
 

src/build_romfs.c

@@ -0,0 +1,19 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "romfs.h"
+
+int main(int argc, char **argv) {
+    
+    if (argc != 3) {
+        printf("Usage: %s <in directory> <out RomFS filepath>\n", argv[0]);
+        return 1;
+    }
+    
+    build_romfs_by_paths(argv[1], argv[2]);
+    
+    printf("Done!\n");
+    
+    return 0;
+}

src/elf2nro.c

@@ -6,6 +6,7 @@
 #include <lz4.h>
 #include "sha256.h"
 #include "elf64.h"
+#include "romfs.h"
 
 typedef uint64_t u64;
 typedef uint32_t u32;
@@ -79,7 +80,8 @@ int main(int argc, char* argv[]) {
         fprintf(stderr, "Options:\n");
         fprintf(stderr, "--icon=<iconpath> Embeds icon into the output file.\n");
         fprintf(stderr, "--nacp=<control.nacp> Embeds control.nacp into the output file.\n");
-        fprintf(stderr, "--romfs=<image> Embeds RomFS into the output file.\n");//TODO: Use directory for input instead.
+        fprintf(stderr, "--romfs=<image> Embeds RomFS into the output file.\n");
+        fprintf(stderr, "--romfsdir=<directory> Builds and embeds RomFS into the output file.\n");
         return EXIT_FAILURE;
     }
     
@@ -103,13 +105,19 @@ int main(int argc, char* argv[]) {
     }
 
     int argi;
-    char* icon_path = NULL, *nacp_path = NULL, *romfs_path = NULL;
+    char* icon_path = NULL, *nacp_path = NULL, *romfs_path = NULL, *romfs_dir_path = NULL;
     for (argi=3; argi<argc; argi++) {
         if (strncmp(argv[argi], "--icon=", 7)==0) icon_path = &argv[argi][7];
         if (strncmp(argv[argi], "--nacp=", 7)==0) nacp_path = &argv[argi][7];
         if (strncmp(argv[argi], "--romfs=", 8)==0) romfs_path = &argv[argi][8];
+        if (strncmp(argv[argi], "--romfsdir=", 11)==0) romfs_dir_path = &argv[argi][11];
     }
-
+    
+    if (romfs_dir_path != NULL && romfs_path != NULL) {
+        fprintf(stderr, "Cannot have a RomFS and a RomFS Directory at the same time!\n");
+        return EXIT_FAILURE;
+    }
+    
     if (elf_len < sizeof(Elf64_Ehdr)) {
         fprintf(stderr, "Input file doesn't fit ELF header!\n");
         return EXIT_FAILURE;
@@ -247,6 +255,12 @@ int main(int argc, char* argv[]) {
         asset_hdr.romfs.offset = tmp_off;
         asset_hdr.romfs.size = romfs_len;
         tmp_off+= romfs_len;
+        
+    } else if (romfs_dir_path) {
+        asset_hdr.romfs.offset = tmp_off;
+        asset_hdr.romfs.size = build_romfs_by_path_into_file(romfs_dir_path, out, file_off + tmp_off);
+        tmp_off+= asset_hdr.romfs.size;
+        fseek(out, file_off, SEEK_SET);
     }
 
     fwrite(&asset_hdr, sizeof(asset_hdr), 1, out);

src/filepath.c

@@ -0,0 +1,128 @@
+#include <sys/stat.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+
+#include "types.h"
+#include "filepath.h"
+
+void os_strncpy(oschar_t *dst, const char *src, size_t size) {
+#ifdef _WIN32
+    MultiByteToWideChar(CP_UTF8, 0, src, -1, dst, size);
+#else
+    strncpy(dst, src, size);
+#endif
+}
+
+void os_strncpy_to_char(char *dst, const oschar_t *src, size_t size) {
+#ifdef _WIN32
+    WideCharToMultiByte(CP_UTF8, 0, src, -1, dst, size, NULL, NULL);
+#else
+    strncpy(dst, src, size);
+#endif
+}
+
+int os_makedir(const oschar_t *dir) {
+#ifdef _WIN32
+    return _wmkdir(dir);
+#else
+    return mkdir(dir, 0777);
+#endif
+}
+
+int os_rmdir(const oschar_t *dir) {
+#ifdef _WIN32
+    return _wrmdir(dir);
+#else
+    return remove(dir);
+#endif
+}
+
+void filepath_update(filepath_t *fpath) {
+    memset(fpath->os_path, 0, MAX_SWITCHPATH * sizeof(oschar_t));
+    os_strncpy(fpath->os_path, fpath->char_path, MAX_SWITCHPATH);
+}
+
+void filepath_init(filepath_t *fpath) {
+    fpath->valid = VALIDITY_INVALID;
+}
+
+void filepath_copy(filepath_t *fpath, filepath_t *copy) {
+    if (copy != NULL && copy->valid == VALIDITY_VALID)
+        memcpy(fpath, copy, sizeof(filepath_t));
+    else
+        memset(fpath, 0, sizeof(filepath_t));
+}
+
+void filepath_os_append(filepath_t *fpath, oschar_t *path) {
+    char tmppath[MAX_SWITCHPATH];
+    if (fpath->valid == VALIDITY_INVALID)
+        return;
+    
+    memset(tmppath, 0, MAX_SWITCHPATH);
+    
+    os_strncpy_to_char(tmppath, path, MAX_SWITCHPATH);
+    strcat(fpath->char_path, OS_PATH_SEPARATOR);
+    strcat(fpath->char_path, tmppath);
+    filepath_update(fpath);
+}
+
+void filepath_append(filepath_t *fpath, const char *format, ...) {
+    char tmppath[MAX_SWITCHPATH];
+    va_list args;
+
+    if (fpath->valid == VALIDITY_INVALID)
+        return;
+
+    memset(tmppath, 0, MAX_SWITCHPATH);
+
+    va_start(args, format);
+    vsnprintf(tmppath, sizeof(tmppath), format, args);
+    va_end(args);
+
+    strcat(fpath->char_path, OS_PATH_SEPARATOR);
+    strcat(fpath->char_path, tmppath);
+    filepath_update(fpath);
+}
+
+void filepath_append_n(filepath_t *fpath, uint32_t n, const char *format, ...) {
+    char tmppath[MAX_SWITCHPATH];
+    va_list args;
+
+    if (fpath->valid == VALIDITY_INVALID || n > MAX_SWITCHPATH)
+        return;
+
+    memset(tmppath, 0, MAX_SWITCHPATH);
+
+    va_start(args, format);
+    vsnprintf(tmppath, sizeof(tmppath), format, args);
+    va_end(args);
+
+    strcat(fpath->char_path, OS_PATH_SEPARATOR);
+    strncat(fpath->char_path, tmppath, n);
+    filepath_update(fpath);
+}
+
+void filepath_set(filepath_t *fpath, const char *path) {
+    if (strlen(path) < MAX_SWITCHPATH) {
+        fpath->valid = VALIDITY_VALID;
+        memset(fpath->char_path, 0, MAX_SWITCHPATH);
+        strncpy(fpath->char_path, path, MAX_SWITCHPATH);
+        filepath_update(fpath);
+    } else {
+        fpath->valid = VALIDITY_INVALID;
+    }
+}
+
+oschar_t *filepath_get(filepath_t *fpath) {
+    if (fpath->valid == VALIDITY_INVALID)
+        return NULL;
+    else
+        return fpath->os_path;
+}

src/filepath.h

@@ -0,0 +1,88 @@
+#pragma once
+
+#include "types.h"
+#include <dirent.h>
+#ifdef _WIN32
+#include <direct.h>
+#include <wchar.h>
+#endif
+
+#define __USE_LARGEFILE64
+
+#define MAX_SWITCHPATH 0x300
+
+typedef enum {
+    VALIDITY_UNCHECKED = 0,
+    VALIDITY_INVALID,
+    VALIDITY_VALID
+} validity_t;
+
+#ifdef _MSC_VER
+inline int fseeko64(FILE *__stream, long long __off, int __whence)
+{
+    return _fseeki64(__stream, __off, __whence);
+}
+#elif __APPLE__ || __CYGWIN__ 
+    // OS X file I/O is 64bit
+    #define fseeko64 fseek
+#elif __linux__
+    extern int fseeko64 (FILE *__stream, __off64_t __off, int __whence);
+#else
+    /* fseeko is guaranteed by POSIX, hopefully the OS made their off_t definition 64-bit;
+     * known sane on FreeBSD and OpenBSD.
+     */
+    #define fseeko64 fseeko
+#endif
+
+#ifdef _WIN32
+typedef wchar_t oschar_t; /* utf-16 */
+typedef _WDIR osdir_t;
+typedef struct _wdirent osdirent_t;
+typedef struct _stati64 os_stat64_t;
+
+#define os_fopen _wfopen
+#define os_opendir _wopendir
+#define os_readdir _wreaddir
+#define os_stat _wstati64
+#define os_fclose fclose
+
+#define OS_MODE_READ L"rb"
+#define OS_MODE_WRITE L"wb"
+#define OS_MODE_EDIT L"rb+"
+#else
+typedef char oschar_t; /* utf-8 */
+typedef DIR osdir_t;
+typedef struct dirent osdirent_t;
+typedef struct stat64 os_stat64_t;
+
+#define os_fopen fopen
+#define os_opendir opendir
+#define os_readdir readdir
+#define os_stat stat64
+#define os_fclose fclose
+
+#define OS_MODE_READ "rb"
+#define OS_MODE_WRITE "wb"
+#define OS_MODE_EDIT "rb+"
+#endif
+
+#define OS_PATH_SEPARATOR "/"
+
+typedef struct filepath {
+    char char_path[MAX_SWITCHPATH];
+    oschar_t os_path[MAX_SWITCHPATH];
+    validity_t valid;
+} filepath_t;
+
+void os_strncpy(oschar_t *dst, const char *src, size_t size);
+void os_strncpy_to_char(char *dst, const oschar_t *src, size_t size);
+int os_makedir(const oschar_t *dir);
+int os_rmdir(const oschar_t *dir);
+
+void filepath_init(filepath_t *fpath);
+void filepath_copy(filepath_t *fpath, filepath_t *copy);
+void filepath_os_append(filepath_t *fpath, oschar_t *path);
+void filepath_append(filepath_t *fpath, const char *format, ...);
+void filepath_append_n(filepath_t *fpath, uint32_t n, const char *format, ...);
+void filepath_set(filepath_t *fpath, const char *path);
+oschar_t *filepath_get(filepath_t *fpath);

src/romfs.c

@@ -0,0 +1,545 @@
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <dirent.h>
+
+#include "types.h"
+#include "romfs.h"
+#include "filepath.h"
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+struct romfs_fent_ctx;
+
+typedef struct romfs_dirent_ctx {
+    filepath_t sum_path;
+    filepath_t cur_path;
+    uint32_t entry_offset;
+    struct romfs_dirent_ctx *parent; /* Parent node */
+    struct romfs_dirent_ctx *child; /* Child node */
+    struct romfs_dirent_ctx *sibling; /* Sibling node */
+    struct romfs_fent_ctx *file; /* File node */
+    struct romfs_dirent_ctx *next; /* Next node */
+} romfs_dirent_ctx_t;
+
+typedef struct romfs_fent_ctx {
+    filepath_t sum_path;
+    filepath_t cur_path;
+    uint32_t entry_offset;
+    uint64_t offset;
+    uint64_t size;
+    romfs_dirent_ctx_t *parent; /* Parent dir */
+    struct romfs_fent_ctx *sibling; /* Sibling file */
+    struct romfs_fent_ctx *next; /* Logical next file */
+} romfs_fent_ctx_t;
+
+typedef struct {
+    romfs_fent_ctx_t *files;
+    uint64_t num_dirs;
+    uint64_t num_files;
+    uint64_t dir_table_size;
+    uint64_t file_table_size;
+    uint64_t dir_hash_table_size;
+    uint64_t file_hash_table_size;
+    uint64_t file_partition_size;
+} romfs_ctx_t;
+
+typedef struct {
+    uint64_t header_size;
+    uint64_t dir_hash_table_ofs;
+    uint64_t dir_hash_table_size;
+    uint64_t dir_table_ofs;
+    uint64_t dir_table_size;
+    uint64_t file_hash_table_ofs;
+    uint64_t file_hash_table_size;
+    uint64_t file_table_ofs;
+    uint64_t file_table_size;
+    uint64_t file_partition_ofs;
+} romfs_header_t;
+
+typedef struct {
+    uint32_t parent;
+    uint32_t sibling;
+    uint32_t child;
+    uint32_t file;
+    uint32_t hash;
+    uint32_t name_size;
+    char name[];
+} romfs_direntry_t;
+
+typedef struct {
+    uint32_t parent;
+    uint32_t sibling;
+    uint64_t offset;
+    uint64_t size;
+    uint32_t hash;
+    uint32_t name_size;
+    char name[];
+} romfs_fentry_t;
+
+#define ROMFS_ENTRY_EMPTY 0xFFFFFFFF
+#define ROMFS_FILEPARTITION_OFS 0x200
+
+romfs_direntry_t *romfs_get_direntry(romfs_direntry_t *directories, uint32_t offset) {
+    return (romfs_direntry_t *)((char *)directories + offset);
+}
+
+romfs_fentry_t *romfs_get_fentry(romfs_fentry_t *files, uint32_t offset) {
+    return (romfs_fentry_t *)((char *)files + offset);
+}
+
+uint32_t calc_path_hash(uint32_t parent, const unsigned char *path, uint32_t start, size_t path_len) {
+    uint32_t hash = parent ^ 123456789;
+    for (uint32_t i = 0; i < path_len; i++) {
+        hash = (hash >> 5) | (hash << 27);
+        hash ^= path[start + i];
+    }
+        
+    return hash;
+}
+
+uint32_t align(uint32_t offset, uint32_t alignment) { 
+    uint32_t mask = ~(alignment-1);
+
+    return (offset + (alignment-1)) & mask;
+}
+
+uint64_t align64(uint64_t offset, uint64_t alignment) {
+    uint64_t mask = ~(uint64_t)(alignment-1);
+
+    return (offset + (alignment-1)) & mask;
+}
+
+uint32_t romfs_get_hash_table_count(uint32_t num_entries) {
+    if (num_entries < 3) {
+        return 3;
+    } else if (num_entries < 19) {
+        return num_entries | 1;
+    }
+    uint32_t count = num_entries;
+    while (count % 2 == 0 || count % 3 == 0 || count % 5 == 0 || count % 7 == 0 || count % 11 == 0 || count % 13 == 0 || count % 17 == 0) {
+        count++;
+    }
+    return count;
+}
+
+void romfs_visit_dir(romfs_dirent_ctx_t *parent, romfs_ctx_t *romfs_ctx) {
+    osdir_t *dir = NULL;
+    osdirent_t *cur_dirent = NULL;
+    romfs_dirent_ctx_t *child_dir_tree = NULL;
+    romfs_fent_ctx_t *child_file_tree = NULL;
+    romfs_dirent_ctx_t *cur_dir = NULL;
+    romfs_fent_ctx_t *cur_file = NULL;
+    filepath_t cur_path;
+    filepath_t cur_sum_path;
+    
+    os_stat64_t cur_stats;
+    
+    if ((dir = os_opendir(parent->sum_path.os_path)) == NULL) {
+        fprintf(stderr, "Failed to open directory %s!\n", parent->sum_path.char_path);
+        exit(EXIT_FAILURE);
+    }
+    
+    while ((cur_dirent = os_readdir(dir))) {
+        filepath_init(&cur_path);
+        filepath_set(&cur_path, "");
+        filepath_os_append(&cur_path, cur_dirent->d_name);
+        
+        if (strcmp(cur_path.char_path, "/.") == 0 || strcmp(cur_path.char_path, "/..") == 0) {
+            /* Special case . and .. */
+            continue;
+        }
+        
+        filepath_copy(&cur_sum_path, &parent->sum_path);
+        filepath_os_append(&cur_sum_path, cur_dirent->d_name);
+        
+        if (os_stat(cur_sum_path.os_path, &cur_stats) == -1) {
+            fprintf(stderr, "Failed to stat %s\n", cur_sum_path.char_path);
+            exit(EXIT_FAILURE);
+        }
+        
+        if ((cur_stats.st_mode & S_IFMT) == S_IFDIR) {
+            /* Directory */
+            if ((cur_dir = calloc(1, sizeof(romfs_dirent_ctx_t))) == NULL) {
+                fprintf(stderr, "Failed to allocate RomFS directory context!\n");
+                exit(EXIT_FAILURE);
+            }
+            
+            romfs_ctx->num_dirs++;
+            
+            cur_dir->parent = parent;
+            filepath_copy(&cur_dir->sum_path, &cur_sum_path);
+            filepath_copy(&cur_dir->cur_path, &cur_path);
+            
+            romfs_ctx->dir_table_size += 0x18 + align(strlen(cur_dir->cur_path.char_path)-1, 4);
+            
+            /* Ordered insertion on sibling */
+            if (child_dir_tree == NULL || strcmp(cur_dir->sum_path.char_path, child_dir_tree->sum_path.char_path) < 0) {
+                cur_dir->sibling = child_dir_tree;
+                child_dir_tree = cur_dir;
+            } else {
+                romfs_dirent_ctx_t *child, *prev;
+                prev = child_dir_tree;
+                child = child_dir_tree->sibling;
+                while (child != NULL) {
+                    if (strcmp(cur_dir->sum_path.char_path, child->sum_path.char_path) < 0) {
+                        break;
+                    }
+                    prev = child;
+                    child = child->sibling;         
+                }
+                
+                prev->sibling = cur_dir;
+                cur_dir->sibling = child;
+            }
+            
+            /* Ordered insertion on next */
+            romfs_dirent_ctx_t *tmp = parent->next, *tmp_prev = parent;
+            while (tmp != NULL) {
+                if (strcmp(cur_dir->sum_path.char_path, tmp->sum_path.char_path) < 0) {
+                    break;
+                }
+                tmp_prev = tmp;
+                tmp = tmp->next;         
+            }
+            tmp_prev->next = cur_dir;
+            cur_dir->next = tmp;
+            
+            cur_dir = NULL;
+        } else if ((cur_stats.st_mode & S_IFMT) == S_IFREG) {
+            /* File */
+            if ((cur_file = calloc(1, sizeof(romfs_fent_ctx_t))) == NULL) {
+                fprintf(stderr, "Failed to allocate RomFS File context!\n");
+                exit(EXIT_FAILURE);
+            }
+            
+            romfs_ctx->num_files++;
+            
+            cur_file->parent = parent;
+            filepath_copy(&cur_file->sum_path, &cur_sum_path);
+            filepath_copy(&cur_file->cur_path, &cur_path);
+            cur_file->size = cur_stats.st_size;
+            
+            romfs_ctx->file_table_size += 0x20 + align(strlen(cur_file->cur_path.char_path)-1, 4);
+            
+            /* Ordered insertion on sibling */
+            if (child_file_tree == NULL || strcmp(cur_file->sum_path.char_path, child_file_tree->sum_path.char_path) < 0) {
+                cur_file->sibling = child_file_tree;
+                child_file_tree = cur_file;
+            } else {
+                romfs_fent_ctx_t *child, *prev;
+                prev = child_file_tree;
+                child = child_file_tree->sibling;
+                while (child != NULL) {
+                    if (strcmp(cur_file->sum_path.char_path, child->sum_path.char_path) < 0) {
+                        break;
+                    }
+                    prev = child;
+                    child = child->sibling;         
+                }
+                
+                prev->sibling = cur_file;
+                cur_file->sibling = child;
+            }
+            
+            /* Ordered insertion on next */
+            if (romfs_ctx->files == NULL || strcmp(cur_file->sum_path.char_path, romfs_ctx->files->sum_path.char_path) < 0) {
+                cur_file->next = romfs_ctx->files;
+                romfs_ctx->files = cur_file;
+            } else {
+                romfs_fent_ctx_t *child, *prev;
+                prev = romfs_ctx->files;
+                child = romfs_ctx->files->next;
+                while (child != NULL) {
+                    if (strcmp(cur_file->sum_path.char_path, child->sum_path.char_path) < 0) {
+                        break;
+                    }
+                    prev = child;
+                    child = child->next;         
+                }
+                
+                prev->next = cur_file;
+                cur_file->next = child;
+            }
+            
+            cur_file = NULL;
+        } else {
+            fprintf(stderr, "Invalid FS object type for %s!\n", cur_path.char_path);
+            exit(EXIT_FAILURE);
+        }
+    }
+    
+    parent->child = child_dir_tree;
+    parent->file = child_file_tree;
+    
+    cur_dir = child_dir_tree;
+    while (cur_dir != NULL) {
+        romfs_visit_dir(cur_dir, romfs_ctx);
+        cur_dir = cur_dir->sibling;
+    }
+}
+
+size_t build_romfs_into_file(filepath_t *in_dirpath, FILE *f_out, off_t base_offset) {
+    romfs_dirent_ctx_t *root_ctx = calloc(1, sizeof(romfs_dirent_ctx_t));
+    if (root_ctx == NULL) {
+        fprintf(stderr, "Failed to allocate root context!\n");
+        exit(EXIT_FAILURE);
+    }
+    
+    root_ctx->parent = root_ctx;
+    
+    romfs_ctx_t romfs_ctx;
+    memset(&romfs_ctx, 0, sizeof(romfs_ctx));
+    
+    filepath_copy(&root_ctx->sum_path, in_dirpath);
+    filepath_init(&root_ctx->cur_path);
+    filepath_set(&root_ctx->cur_path, "");
+    romfs_ctx.dir_table_size = 0x18; /* Root directory. */
+    romfs_ctx.num_dirs = 1;
+    
+    /* Visit all directories. */
+    printf("Visiting directories...\n");
+    romfs_visit_dir(root_ctx, &romfs_ctx);
+    uint32_t dir_hash_table_entry_count = romfs_get_hash_table_count(romfs_ctx.num_dirs);
+    uint32_t file_hash_table_entry_count = romfs_get_hash_table_count(romfs_ctx.num_files);
+    romfs_ctx.dir_hash_table_size = 4 * dir_hash_table_entry_count;
+    romfs_ctx.file_hash_table_size = 4 * file_hash_table_entry_count;
+    
+    romfs_header_t header;
+    memset(&header, 0, sizeof(header));
+    romfs_fent_ctx_t *cur_file = NULL;
+    romfs_dirent_ctx_t *cur_dir = NULL;
+    uint32_t entry_offset = 0;
+    
+    
+    uint32_t *dir_hash_table = malloc(romfs_ctx.dir_hash_table_size);
+    if (dir_hash_table == NULL) {
+        fprintf(stderr, "Failed to allocate directory hash table!\n");
+        exit(EXIT_FAILURE);
+    }
+    
+    for (uint32_t i = 0; i < dir_hash_table_entry_count; i++) {
+        dir_hash_table[i] = le_word(ROMFS_ENTRY_EMPTY);
+    }
+    
+    uint32_t *file_hash_table = malloc(romfs_ctx.file_hash_table_size);
+    if (file_hash_table == NULL) {
+        fprintf(stderr, "Failed to allocate file hash table!\n");
+        exit(EXIT_FAILURE);
+    }
+    
+    for (uint32_t i = 0; i < file_hash_table_entry_count; i++) {
+        file_hash_table[i] = le_word(ROMFS_ENTRY_EMPTY);
+    }
+    
+    romfs_direntry_t *dir_table = calloc(1, romfs_ctx.dir_table_size);
+    if (dir_table == NULL) {
+        fprintf(stderr, "Failed to allocate directory table!\n");
+        exit(EXIT_FAILURE);
+    }
+    
+    romfs_fentry_t *file_table = calloc(1, romfs_ctx.file_table_size);
+    if (file_table == NULL) {
+        fprintf(stderr, "Failed to allocate file table!\n");
+        exit(EXIT_FAILURE);
+    }
+     
+    printf("Calculating metadata...\n");
+    /* Determine file offsets. */
+    cur_file = romfs_ctx.files;
+    entry_offset = 0;
+    while (cur_file != NULL) {
+        romfs_ctx.file_partition_size = align64(romfs_ctx.file_partition_size, 0x10);
+        cur_file->offset = romfs_ctx.file_partition_size;
+        romfs_ctx.file_partition_size += cur_file->size;
+        cur_file->entry_offset = entry_offset;
+        entry_offset += 0x20 + align(strlen(cur_file->cur_path.char_path)-1, 4);
+        cur_file = cur_file->next;
+    }
+    
+    /* Determine dir offsets. */
+    cur_dir = root_ctx;
+    entry_offset = 0;
+    while (cur_dir != NULL) {
+        cur_dir->entry_offset = entry_offset;
+        if (cur_dir == root_ctx) {
+            entry_offset += 0x18;
+        } else {
+            entry_offset += 0x18 + align(strlen(cur_dir->cur_path.char_path)-1, 4);
+        }
+        cur_dir = cur_dir->next;
+    }
+    
+    /* Populate file tables. */
+    cur_file = romfs_ctx.files;
+    while (cur_file != NULL) {
+        romfs_fentry_t *cur_entry = romfs_get_fentry(file_table, cur_file->entry_offset);
+        cur_entry->parent = le_word(cur_file->parent->entry_offset);
+        cur_entry->sibling = le_word(cur_file->sibling == NULL ? ROMFS_ENTRY_EMPTY : cur_file->sibling->entry_offset);
+        cur_entry->offset = le_dword(cur_file->offset);
+        cur_entry->size = le_dword(cur_file->size);
+        
+        uint32_t name_size = strlen(cur_file->cur_path.char_path)-1;
+        uint32_t hash = calc_path_hash(cur_file->parent->entry_offset, (unsigned char *)cur_file->cur_path.char_path, 1, name_size);
+        cur_entry->hash = file_hash_table[hash % file_hash_table_entry_count];
+        file_hash_table[hash % file_hash_table_entry_count] = le_word(cur_file->entry_offset);
+        
+        cur_entry->name_size = name_size;
+        memcpy(cur_entry->name, cur_file->cur_path.char_path + 1, name_size);
+        
+        cur_file = cur_file->next;
+    }
+    
+    /* Populate dir tables. */
+    cur_dir = root_ctx;
+    while (cur_dir != NULL) {
+        romfs_direntry_t *cur_entry = romfs_get_direntry(dir_table, cur_dir->entry_offset);   
+        cur_entry->parent = le_word(cur_dir->parent->entry_offset);
+        cur_entry->sibling = le_word(cur_dir->sibling == NULL ? ROMFS_ENTRY_EMPTY : cur_dir->sibling->entry_offset);
+        cur_entry->child = le_word(cur_dir->child == NULL ? ROMFS_ENTRY_EMPTY : cur_dir->child->entry_offset);
+        cur_entry->file = le_word(cur_dir->file == NULL ? ROMFS_ENTRY_EMPTY : cur_dir->file->entry_offset);
+        
+        uint32_t name_size = (cur_dir == root_ctx) ? 0 : strlen(cur_dir->cur_path.char_path)-1;
+        uint32_t hash = calc_path_hash((cur_dir == root_ctx) ? 0 : cur_dir->parent->entry_offset, (unsigned char *)cur_dir->cur_path.char_path, 1, name_size);
+        cur_entry->hash = dir_hash_table[hash % dir_hash_table_entry_count];
+        dir_hash_table[hash % dir_hash_table_entry_count] = le_word(cur_dir->entry_offset);
+        
+        cur_entry->name_size = name_size;
+        memcpy(cur_entry->name, cur_dir->cur_path.char_path + 1, name_size);
+        
+        romfs_dirent_ctx_t *temp = cur_dir;
+        cur_dir = cur_dir->next;
+        free(temp);
+    }
+    
+    header.header_size = le_dword(sizeof(header));
+    header.file_hash_table_size = le_dword(romfs_ctx.file_hash_table_size);
+    header.file_table_size = le_dword(romfs_ctx.file_table_size);
+    header.dir_hash_table_size = le_dword(romfs_ctx.dir_hash_table_size);
+    header.dir_table_size = le_dword(romfs_ctx.dir_table_size);
+    header.file_partition_ofs = le_dword(ROMFS_FILEPARTITION_OFS);
+    
+    /* Abuse of endianness follows. */
+    uint64_t dir_hash_table_ofs = align64(romfs_ctx.file_partition_size + ROMFS_FILEPARTITION_OFS, 4);
+    header.dir_hash_table_ofs = dir_hash_table_ofs;
+    header.dir_table_ofs = header.dir_hash_table_ofs + romfs_ctx.dir_hash_table_size;
+    header.file_hash_table_ofs = header.dir_table_ofs + romfs_ctx.dir_table_size;
+    header.file_table_ofs = header.file_hash_table_ofs + romfs_ctx.file_hash_table_size;
+    header.dir_hash_table_ofs = le_dword(header.dir_hash_table_ofs);
+    header.dir_table_ofs = le_dword(header.dir_table_ofs);
+    header.file_hash_table_ofs = le_dword(header.file_hash_table_ofs);
+    header.file_table_ofs = le_dword(header.file_table_ofs);
+    
+    fseeko64(f_out, base_offset, SEEK_SET);
+    fwrite(&header, 1, sizeof(header), f_out);
+    
+    /* Write files. */
+    unsigned char *buffer = malloc(0x400000);
+    if (buffer == NULL) {
+        fprintf(stderr, "Failed to allocate work buffer!\n");
+        exit(EXIT_FAILURE);
+    }
+    cur_file = romfs_ctx.files;
+    while (cur_file != NULL) {
+        FILE *f_in = os_fopen(cur_file->sum_path.os_path, OS_MODE_READ);
+        if (f_in == NULL) {
+            fprintf(stderr, "Failed to open %s!\n", cur_file->sum_path.char_path);
+            exit(EXIT_FAILURE);
+        }
+        
+        printf("Writing %s to RomFS image...\n", cur_file->sum_path.char_path);
+        fseeko64(f_out, base_offset + cur_file->offset + ROMFS_FILEPARTITION_OFS, SEEK_SET);
+        uint64_t offset = 0;
+        uint64_t read_size = 0x400000;
+        while (offset < cur_file->size) {
+            if (cur_file->size - offset < read_size) {
+                read_size = cur_file->size - offset;
+            }
+            
+            if (fread(buffer, 1, read_size, f_in) != read_size) {
+                fprintf(stderr, "Failed to read from %s!\n", cur_file->sum_path.char_path);
+                exit(EXIT_FAILURE);
+            }
+            
+            if (fwrite(buffer, 1, read_size, f_out) != read_size) {
+                fprintf(stderr, "Failed to write to output!\n");
+                exit(EXIT_FAILURE);
+            }
+            
+            offset += read_size;
+        }
+        
+        os_fclose(f_in);
+        
+        romfs_fent_ctx_t *temp = cur_file;
+        cur_file = cur_file->next;
+        free(temp);
+    }
+    free(buffer);
+    
+    fseeko64(f_out, base_offset + dir_hash_table_ofs, SEEK_SET);
+    if (fwrite(dir_hash_table, 1, romfs_ctx.dir_hash_table_size, f_out) != romfs_ctx.dir_hash_table_size) {
+        fprintf(stderr, "Failed to write dir hash table!\n");
+        exit(EXIT_FAILURE);
+    }
+    free(dir_hash_table);
+    
+    if (fwrite(dir_table, 1, romfs_ctx.dir_table_size, f_out) != romfs_ctx.dir_table_size) {
+        fprintf(stderr, "Failed to write dir table!\n");
+        exit(EXIT_FAILURE);
+    }
+    free(dir_table);
+    
+    if (fwrite(file_hash_table, 1, romfs_ctx.file_hash_table_size, f_out) != romfs_ctx.file_hash_table_size) {
+        fprintf(stderr, "Failed to write file hash table!\n");
+        exit(EXIT_FAILURE);
+    }
+    free(file_hash_table);
+    
+    if (fwrite(file_table, 1, romfs_ctx.file_table_size, f_out) != romfs_ctx.file_table_size) {
+        fprintf(stderr, "Failed to write file table!\n");
+        exit(EXIT_FAILURE);
+    }
+    free(file_table);
+    
+    return dir_hash_table_ofs + romfs_ctx.dir_hash_table_size + romfs_ctx.dir_table_size + romfs_ctx.file_hash_table_size + romfs_ctx.file_table_size;
+}
+
+size_t build_romfs(filepath_t *in_dirpath, filepath_t *out_romfspath) {
+    FILE *f_out = NULL;
+    
+    if ((f_out = os_fopen(out_romfspath->os_path, OS_MODE_WRITE)) == NULL) {
+        fprintf(stderr, "Failed to open %s!\n", out_romfspath->char_path);
+        exit(EXIT_FAILURE);
+    }
+    
+    size_t sz = build_romfs_into_file(in_dirpath, f_out, 0);
+    
+    fclose(f_out);
+    return sz;
+}
+
+size_t build_romfs_by_paths(char *dir, char *out_fn) {
+    filepath_t dirpath;
+    filepath_t outpath;
+    
+    filepath_init(&dirpath);
+    filepath_init(&outpath);
+    
+    filepath_set(&dirpath, dir);
+    filepath_set(&outpath, out_fn);
+    
+    return build_romfs(&dirpath, &outpath);
+}
+
+size_t build_romfs_by_path_into_file(char *dir, FILE *f_out, off_t offset) {
+    filepath_t dirpath;
+    
+    filepath_init(&dirpath);
+    
+    filepath_set(&dirpath, dir);
+
+    return build_romfs_into_file(&dirpath, f_out, offset);
+}

src/romfs.h

@@ -0,0 +1,7 @@
+#pragma once
+
+#include "filepath.h"
+
+size_t build_romfs_by_paths(char *dir, char *out_fn);
+
+size_t build_romfs_by_path_into_file(char *dir, FILE *f_out, off_t base_offset);