Added ability to calculate & compare file SHA-256

source/fs.c

@@ -2,6 +2,7 @@
 #include "fs.h"
 #include "virtual.h"
 #include "image.h"
+#include "sha.h"
 #include "ff.h"
 
 #define MAIN_BUFFER ((u8*)0x21200000)
@@ -204,6 +205,53 @@ size_t FileGetSize(const char* path) {
     return 0;
 }
 
+bool FileGetSha256(const char* path, u8* sha256) {
+    bool ret = true;
+    
+    sha_init(SHA256_MODE);
+    ShowProgress(0, 0, path);
+    if (GetVirtualSource(path)) { // for virtual files
+        VirtualFile vfile;
+        u32 fsize;
+        
+        if (!FindVirtualFile(&vfile, path, 0))
+            return false;
+        fsize = vfile.size;
+        
+        for (size_t pos = 0; (pos < fsize) && ret; pos += MAIN_BUFFER_SIZE) {
+            UINT read_bytes = min(MAIN_BUFFER_SIZE, fsize - pos);
+            if (ReadVirtualFile(&vfile, MAIN_BUFFER, pos, read_bytes, NULL) != 0)
+                ret = false;
+            if (!ShowProgress(pos + read_bytes, fsize, path))
+                ret = false;
+            sha_update(MAIN_BUFFER, read_bytes);
+        }
+    } else { // for regular FAT files
+        FIL file;
+        size_t fsize;
+        
+        if (f_open(&file, path, FA_READ | FA_OPEN_EXISTING) != FR_OK)
+            return false;
+        fsize = f_size(&file);
+        f_lseek(&file, 0);
+        f_sync(&file);
+        
+        for (size_t pos = 0; (pos < fsize) && ret; pos += MAIN_BUFFER_SIZE) {
+            UINT bytes_read = 0;            
+            if (f_read(&file, MAIN_BUFFER, MAIN_BUFFER_SIZE, &bytes_read) != FR_OK)
+                ret = false;
+            if (!ShowProgress(pos + bytes_read, fsize, path))
+                ret = false;
+            sha_update(MAIN_BUFFER, bytes_read);
+        }
+        f_close(&file);
+    }
+    ShowProgress(1, 1, path);
+    sha_get(sha256);
+    
+    return ret;
+}
+
 bool PathCopyVirtual(const char* destdir, const char* orig) {
     char dest[256]; // maximum path name length in FAT
     char* oname = strrchr(orig, '/');

source/fs.h

@@ -47,6 +47,9 @@ size_t FileGetData(const char* path, u8* data, size_t size, size_t foffset);
 /** Get size of file **/
 size_t FileGetSize(const char* path);
 
+/** Get SHA-256 of file **/
+bool FileGetSha256(const char* path, u8* sha256);
+
 /** Recursively copy a file or directory **/
 bool PathCopy(const char* destdir, const char* orig);
 

source/godmode.c

@@ -335,9 +335,46 @@ u32 GodMode() {
                 scroll = 0;
             } else cursor = 0;
         } else if ((pad_state & BUTTON_A) && (curr_entry->type == T_FILE)) { // process a file
-            u32 file_type = IdentifyImage(curr_entry->path); 
+            u32 file_type = IdentifyImage(curr_entry->path);
-            if (file_type && (PathToNumFS(curr_entry->path) == 0) && // try to mount image / only on SD
+            char pathstr[32 + 1];
-                ShowPrompt(true, "This looks like a %s image\nTry to mount it?", (file_type == IMG_NAND) ? "NAND" : "FAT")) {
+            const char* options[4];
+            u32 n_opt = 2;
+            
+            TruncateString(pathstr, curr_entry->path, 32, 8);
+            options[0] = "Show in Hexviewer";
+            options[1] = "Calculate SHA-256";
+            if (file_type && (PathToNumFS(curr_entry->path) == 0)) {
+                options[2] = (file_type == IMG_NAND) ? "Mount as NAND image" : "Mount as FAT image";
+                n_opt = 3;
+            }
+            
+            u32 user_select = ShowSelectPrompt(n_opt, options, pathstr);
+            if (user_select == 1) { // -> show in hex viewer
+                static bool show_instr = true;
+                if (show_instr) {
+                    ShowPrompt(false, "HexViewer Controls:\n \n\x18\x19\x1A\x1B(+R) - Scroll\nR+Y - Switch view\nB - Exit\n");
+                    show_instr = false;
+                }
+                HexViewer(curr_entry->path);
+            } else if (user_select == 2) { // -> calculate SHA-256
+                static char pathstr_prev[32 + 1] = { 0 };
+                static u8 sha256_prev[32] = { 0 };
+                u8 sha256[32];
+                if (!FileGetSha256(curr_entry->path, sha256)) {
+                    ShowPrompt(false, "Calculating SHA-256: failed!");
+                } else {
+                    ShowPrompt(false, "%s\n%08X%08X%08X%08X\n%08X%08X%08X%08X%s%s",
+                        pathstr,
+                        getbe32(sha256 +  0), getbe32(sha256 +  4),
+                        getbe32(sha256 +  8), getbe32(sha256 + 12),
+                        getbe32(sha256 + 16), getbe32(sha256 + 20),
+                        getbe32(sha256 + 24), getbe32(sha256 + 28),
+                        (memcmp(sha256, sha256_prev, 32) == 0) ? "\n \nIdentical with previous file:\n" : "",
+                        (memcmp(sha256, sha256_prev, 32) == 0) ? pathstr_prev : "");
+                    strncpy(pathstr_prev, pathstr, 32 + 1);
+                    memcpy(sha256_prev, sha256, 32);
+                }
+            } else if (user_select == 3) { // -> mount as image
                 DeinitExtFS();
                 u32 mount_state = MountImage(curr_entry->path);
                 InitExtFS();
@@ -353,9 +390,6 @@ u32 GodMode() {
                 }
                 if (clipboard->n_entries && (strcspn(clipboard->entry[0].path, IMG_DRV) == 0))
                     clipboard->n_entries = 0; // remove invalid clipboard stuff
-            } else if (FileGetSize(curr_entry->path) &&
-                ShowPrompt(true, "Show HexViewer?\n \nControls:\n\x18\x19\x1A\x1B(+R) - Scroll\nR+Y - Switch view\nB - Exit\n")) {
-                HexViewer(curr_entry->path);
             }
         } else if (*current_path && ((pad_state & BUTTON_B) || // one level down
             ((pad_state & BUTTON_A) && (curr_entry->type == T_DOTDOT)))) { 

source/nand/virtual.c

@@ -25,7 +25,7 @@ VirtualFile virtualFileTemplates[] = {
     { "ctrnand_full.bin" , 0x0B930000, 0x41ED0000, 0x05, VFLAG_ON_N3DS },
     { "ctrnand_full.bin" , 0x0B930000, 0x41ED0000, 0x04, VFLAG_ON_NO3DS },
     { "nand.bin"         , 0x00000000, 0x00000000, 0xFF, VFLAG_ON_NAND | VFLAG_NAND_SIZE | VFLAG_A9LH_AREA },
-    { "nand_minsize.bin" , 0x00000000, 0x3AF00000, 0xFF, VFLAG_ON_O3DS | VFLAG_A9LH_AREA},
+    { "nand_minsize.bin" , 0x00000000, 0x3AF00000, 0xFF, VFLAG_ON_O3DS | VFLAG_A9LH_AREA },
     { "nand_minsize.bin" , 0x00000000, 0x4D800000, 0xFF, VFLAG_ON_N3DS | VFLAG_ON_NO3DS | VFLAG_A9LH_AREA },
     { "sector0x96.bin"   , 0x00012C00, 0x00000200, 0xFF, VFLAG_ON_NAND | VFLAG_A9LH_AREA },
     { "nand_hdr.bin"     , 0x00000000, 0x00000200, 0xFF, VFLAG_ON_NAND | VFLAG_A9LH_AREA },

source/ui.c

@@ -203,7 +203,7 @@ bool ShowPrompt(bool ask, const char *format, ...)
     while (true) {
         u32 pad_state = InputWait();
         if (pad_state & BUTTON_A) break;
-        else if (ask && (pad_state & BUTTON_B)) {
+        else if (pad_state & BUTTON_B) {
             ret = false;
             break;
         }
@@ -274,6 +274,51 @@ bool ShowUnlockSequence(u32 seqlvl, const char *format, ...) {
     return (lvl >= len);
 }
 
+u32 ShowSelectPrompt(u32 n, const char** options, const char *format, ...) {
+    u32 str_width, str_height;
+    u32 x, y, yopt;
+    u32 sel = 0;
+    
+    char str[512] = {}; // 512 should be more than enough
+    va_list va;
+
+    va_start(va, format);
+    vsnprintf(str, 512, format, va);
+    va_end(va);
+    
+    if (n == 0) return 0; // check for low number of options
+    else if (n == 1) return ShowPrompt(true, "%s\n%s?", str, options[0]) ? 1 : 0;
+    
+    str_width = GetDrawStringWidth(str);
+    str_height = GetDrawStringHeight(str) + (n * 12) + (3 * 10);
+    if (str_width < 18*8) str_width = 18 * 8;
+    x = (str_width >= SCREEN_WIDTH_TOP) ? 0 : (SCREEN_WIDTH_TOP - str_width) / 2;
+    y = (str_height >= SCREEN_HEIGHT) ? 0 : (SCREEN_HEIGHT - str_height) / 2;
+    yopt = y + GetDrawStringHeight(str) + 8;
+    
+    ClearScreenF(true, false, COLOR_STD_BG);
+    DrawStringF(true, x, y, COLOR_STD_FONT, COLOR_STD_BG, str);
+    DrawStringF(true, x, yopt + (n*12) + 10, COLOR_STD_FONT, COLOR_STD_BG, "(<A> select, <B> cancel)");
+    while (true) {
+        for (u32 i = 0; i < n; i++) {
+            DrawStringF(true, x, yopt + (12*i), (sel == i) ? COLOR_STD_FONT : COLOR_LIGHTGREY, COLOR_STD_BG, "%2.2s %s",
+                (sel == i) ? "->" : "", options[i]);
+        }
+        u32 pad_state = InputWait();
+        if (pad_state & BUTTON_DOWN) sel = (sel+1) % n;
+        else if (pad_state & BUTTON_UP) sel = (sel+n-1) % n;
+        else if (pad_state & BUTTON_A) break;
+        else if (pad_state & BUTTON_B) {
+            sel = n;
+            break;
+        }
+    }
+    
+    ClearScreenF(true, false, COLOR_STD_BG);
+    
+    return (sel >= n) ? 0 : sel + 1;
+}
+
 bool ShowInputPrompt(char* inputstr, u32 max_size, const char *format, ...) {
     const char* alphabet = " ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz(){}[]'`^,~!@#$%&0123456789=+-_.";
     const u32 alphabet_size = strnlen(alphabet, 256);

source/ui.h

@@ -30,6 +30,7 @@
 #define COLOR_TINTEDBLUE    RGB(0x60, 0x60, 0x80)
 #define COLOR_TINTEDYELLOW  RGB(0xD0, 0xD0, 0x60)
 #define COLOR_TINTEDGREEN   RGB(0x70, 0x80, 0x70)
+#define COLOR_LIGHTGREY     RGB(0xB0, 0xB0, 0xB0)
 #define COLOR_DARKGREY      RGB(0x50, 0x50, 0x50)
 #define COLOR_DARKESTGREY   RGB(0x20, 0x20, 0x20)
 
@@ -72,5 +73,6 @@ void FormatBytes(char* str, u64 bytes);
 
 bool ShowPrompt(bool ask, const char *format, ...);
 bool ShowUnlockSequence(u32 seqlvl, const char *format, ...);
+u32 ShowSelectPrompt(u32 n, const char** options, const char *format, ...);
 bool ShowInputPrompt(char* inputstr, u32 max_size, const char *format, ...);
 bool ShowProgress(u64 current, u64 total, const char* opstr);