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Allow for reversion of hex edits

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d0k3 2016-05-21 22:04:03 +02:00
parent fa49efbdbd
commit 407a64df25
1 changed files with 31 additions and 14 deletions
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45
source/godmode.c
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@ -7,7 +7,7 @@
#include "virtual.h" #include "virtual.h"
#include "image.h" #include "image.h"
#define VERSION "0.4.6" #define VERSION "0.4.7"
#define N_PANES 2 #define N_PANES 2
#define IMG_DRV "789I" #define IMG_DRV "789I"
@ -164,9 +164,8 @@ void DrawDirContents(DirStruct* contents, u32 cursor, u32* scroll) {
u32 HexViewer(const char* path) { u32 HexViewer(const char* path) {
static const u32 max_data = (SCREEN_HEIGHT / 8) * 16; static const u32 max_data = (SCREEN_HEIGHT / 8) * 16;
static u32 mode = 0; static u32 mode = 0;
u8* bottom_cpy = WORK_BUFFER; // a copy of the bottom screen framebuffer u8* data = WORK_BUFFER;
u8* data = WORK_BUFFER + (SCREEN_HEIGHT * SCREEN_WIDTH_BOT * 3); u8* bottom_cpy = WORK_BUFFER + 0xC0000; // a copy of the bottom screen framebuffer
u8* data_cpy = data + max_data;
u32 fsize = FileGetSize(path); u32 fsize = FileGetSize(path);
bool dual_screen; bool dual_screen;
@ -180,7 +179,11 @@ u32 HexViewer(const char* path) {
u32 last_offset = (u32) -1; u32 last_offset = (u32) -1;
u32 offset = 0; u32 offset = 0;
static const u32 edit_bsize = 0x4000; // should be multiple of 0x200 * 2
bool edit_mode = false; bool edit_mode = false;
u8* edit_buffer = WORK_BUFFER;
u8* edit_buffer_cpy = WORK_BUFFER + edit_bsize;
u32 edit_start;
int cursor = 0; int cursor = 0;
memcpy(bottom_cpy, BOT_SCREEN, (SCREEN_HEIGHT * SCREEN_WIDTH_BOT * 3)); memcpy(bottom_cpy, BOT_SCREEN, (SCREEN_HEIGHT * SCREEN_WIDTH_BOT * 3));
@ -235,8 +238,14 @@ u32 HexViewer(const char* path) {
offset = (total_shown > fsize) ? 0 : (fsize + cols - total_shown - (fsize % cols)); offset = (total_shown > fsize) ? 0 : (fsize + cols - total_shown - (fsize % cols));
// get data, using max data size (if new offset) // get data, using max data size (if new offset)
if (offset != last_offset) { if (offset != last_offset) {
total_data = FileGetData(path, data, max_data, offset); if (!edit_mode) {
memcpy(data_cpy, data, max_data); total_data = FileGetData(path, data, max_data, offset);
} else { // edit mode - read from memory
if ((offset < edit_start) || (offset + max_data > edit_start + edit_bsize))
offset = last_offset; // we don't expect this to happen
total_data = (fsize - offset >= max_data) ? max_data : fsize - offset;
data = edit_buffer + (offset - edit_start);
}
last_offset = offset; last_offset = offset;
} }
@ -291,15 +300,26 @@ u32 HexViewer(const char* path) {
else if ((pad_state & BUTTON_R1) && (pad_state & BUTTON_Y)) mode = (mode + 1) % 4; else if ((pad_state & BUTTON_R1) && (pad_state & BUTTON_Y)) mode = (mode + 1) % 4;
else if (pad_state & BUTTON_A) edit_mode = true; else if (pad_state & BUTTON_A) edit_mode = true;
else if (pad_state & BUTTON_B) break; else if (pad_state & BUTTON_B) break;
if (edit_mode && !CheckWritePermissions(path)) if (edit_mode && !CheckWritePermissions(path)) {
edit_mode = false; edit_mode = false;
} else { // setup edit mode
cursor = 0;
edit_start = ((offset - (offset % 0x200) <= (edit_bsize / 2)) || (fsize < edit_bsize)) ? 0 :
offset - (offset % 0x200) - (edit_bsize / 2);
FileGetData(path, edit_buffer, edit_bsize, edit_start);
memcpy(edit_buffer_cpy, edit_buffer, edit_bsize);
data = edit_buffer + (offset - edit_start);
}
} else { // editor mode } else { // editor mode
if (pad_state & BUTTON_B) { if (pad_state & BUTTON_B) {
edit_mode = false; edit_mode = false;
cursor = 0; // check for user edits
// write data if required u32 diffs = 0;
if (memcmp(data, data_cpy, total_data) != 0) for (u32 i = 0; i < edit_bsize; i++) if (edit_buffer[i] != edit_buffer_cpy[i]) diffs++;
FileSetData(path, data, total_data, last_offset); if (diffs && ShowPrompt(true, "You made edits in %i place(s).\nWrite changes to file?", diffs))
FileSetData(path, edit_buffer, min(edit_bsize, (fsize - edit_start)), edit_start);
data = WORK_BUFFER;
last_offset = (u32) -1; // force reload from file
} else if (pad_state & BUTTON_A) { } else if (pad_state & BUTTON_A) {
if (pad_state & BUTTON_DOWN) data[cursor]--; if (pad_state & BUTTON_DOWN) data[cursor]--;
else if (pad_state & BUTTON_UP) data[cursor]++; else if (pad_state & BUTTON_UP) data[cursor]++;
@ -326,9 +346,6 @@ u32 HexViewer(const char* path) {
cursor = (offset + cursor >= fsize) ? fsize - offset - 1 : cursor - cols; cursor = (offset + cursor >= fsize) ? fsize - offset - 1 : cursor - cols;
} }
} }
// write data if required
if ((offset != last_offset) && (memcmp(data, data_cpy, total_data) != 0))
FileSetData(path, data, total_data, last_offset);
} }
} }
} }