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Get it halfway working

This commit is contained in:
Přemysl Eric Janouch 2016-12-30 01:44:36 +01:00
parent 5c4be81f25
commit 742647ef80
Signed by: p
GPG Key ID: B715679E3A361BE6
2 changed files with 184 additions and 117 deletions
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10
README.adoc
View File

@ -6,7 +6,7 @@ hex
Plans
-----
In the future, it should be able to automatically interpret fields within files
via a set of Lua scripts.
using a set of Lua scripts.
Packages
--------
@ -49,7 +49,7 @@ Create _~/.config/hex/hex.conf_ with contents like the following:
....
colors = {
header = ""
footer = ""
highlight = "bold"
bar = "reverse"
bar_active = "ul"
@ -61,11 +61,9 @@ colors = {
Terminal caveats
----------------
This application aspires to be as close to a GUI as possible. It expects you
to use the mouse (though it's not required). Terminals are, however, somewhat
tricky to get consistent results on, so be aware of the following:
Terminals are somewhat tricky to get consistent results on, so be aware of the
following:
- use a UTF-8 locale to get finer resolution progress bars and scrollbars
- Xterm needs `XTerm*metaSendsEscape: true` for the default bindings to work
- urxvt's 'vtwheel' plugin sabotages scrolling

261
hex.c
View File

@ -1,5 +1,5 @@
/*
* hex -- a very simple hex viewer
* hex -- hex viewer
*
* Copyright (c) 2016, Přemysl Janouch <p.janouch@gmail.com>
* All rights reserved.
@ -23,12 +23,12 @@
// We "need" to have an enum for attributes before including liberty.
// Avoiding colours in the defaults here in order to support dumb terminals.
#define ATTRIBUTE_TABLE(XX) \
XX( HEADER, "header", -1, -1, 0 ) \
XX( FOOTER, "footer", -1, -1, 0 ) \
XX( HIGHLIGHT, "highlight", -1, -1, A_BOLD ) \
/* Bar */ \
XX( BAR, "bar", -1, -1, A_REVERSE ) \
XX( BAR_ACTIVE, "bar_active", -1, -1, A_UNDERLINE ) \
/* Listview */ \
XX( BAR_ACTIVE, "bar_active", -1, -1, A_REVERSE | A_BOLD ) \
/* View */ \
XX( EVEN, "even", -1, -1, 0 ) \
XX( ODD, "odd", -1, -1, 0 ) \
XX( SELECTION, "selection", -1, -1, A_REVERSE ) \
@ -96,6 +96,12 @@ enum
FOOTER_SIZE = 4, ///< How many rows form the footer
};
enum endianity
{
ENDIANITY_LE, ///< Little endian
ENDIANITY_BE ///< Big endian
};
static struct app_context
{
// Event loop:
@ -113,16 +119,16 @@ static struct app_context
char *filename; ///< Target filename
uint8_t *data; ///< Target data
uint64_t data_len; ///< Length of the data
uint64_t data_offset; ///< Offset of the data within the file
int64_t data_len; ///< Length of the data
int64_t data_offset; ///< Offset of the data within the file
uint64_t view_top; ///< Offset of the top of the screen
uint64_t view_cursor; ///< Offset of the cursor
// View:
// TODO: get rid of this as it can be computed from "data*"
size_t item_count; ///< Total item count
int item_top; ///< Index of the topmost item
int item_selected; ///< Index of the selected item
int64_t view_top; ///< Offset of the top of the screen
int64_t view_cursor; ///< Offset of the cursor
bool view_skip_nibble; ///< Half-byte offset
enum endianity endianity; ///< Endianity
// Emulated widgets:
@ -345,10 +351,10 @@ app_visible_items (void)
static void
app_draw_view (void)
{
uint64_t end_addr = g_ctx.data_offset + g_ctx.data_len;
int64_t end_addr = g_ctx.data_offset + g_ctx.data_len;
for (int y = 0; y < app_visible_items (); y++)
{
uint64_t row_addr = g_ctx.view_top + y * ROW_SIZE;
int64_t row_addr = g_ctx.view_top + y * ROW_SIZE;
if (row_addr > end_addr)
break;
@ -358,7 +364,7 @@ app_draw_view (void)
struct row_buffer buf;
row_buffer_init (&buf);
char *row_addr_str = xstrdup_printf ("%08" PRIX64, row_addr);
char *row_addr_str = xstrdup_printf ("%08" PRIx64, row_addr);
row_buffer_append (&buf, row_addr_str, row_attrs);
free (row_addr_str);
@ -371,7 +377,7 @@ app_draw_view (void)
if (x % 8 == 0) row_buffer_append (&buf, " ", row_attrs);
if (x % 2 == 0) row_buffer_append (&buf, " ", row_attrs);
uint64_t cell_addr = row_addr + x;
int64_t cell_addr = row_addr + x;
if (cell_addr < g_ctx.data_offset
|| cell_addr >= end_addr)
{
@ -412,23 +418,39 @@ app_draw_footer (void)
row_buffer_init (&buf);
row_buffer_append (&buf, APP_TITLE, a_normal);
if (g_ctx.filename)
{
row_buffer_append (&buf, " ", a_normal);
// TODO: transcode from locale encoding
row_buffer_append (&buf, g_ctx.filename, a_active);
char *filename = (char *) u8_strconv_from_locale (g_ctx.filename);
row_buffer_append (&buf, filename, a_active);
free (filename);
}
struct str right;
str_init (&right);
str_append_printf (&right, "%08" PRIx64 " ", g_ctx.view_cursor);
// TODO: endian switch
str_append (&right, "?? ");
// TODO: position indication
str_append (&right, "???");
str_append_printf (&right,
"%s ", g_ctx.endianity == ENDIANITY_LE ? "LE" : "BE");
int64_t top = g_ctx.view_top;
int64_t bot = g_ctx.view_top + app_visible_items () * ROW_SIZE;
if (top <= g_ctx.data_offset
&& bot > g_ctx.data_offset + g_ctx.data_len)
str_append (&right, "All");
else if (top <= g_ctx.data_offset)
str_append (&right, "Top");
else if (bot > g_ctx.data_offset + g_ctx.data_len)
str_append (&right, "Bot");
else
// TODO: position indication in percents
str_append (&right, "??%");
row_buffer_align (&buf, COLS - right.len, a_normal);
row_buffer_append (&buf, right.str, a_normal);
app_flush_buffer (&buf, COLS, a_normal);
uint64_t end_addr = g_ctx.data_offset + g_ctx.data_len;
int64_t end_addr = g_ctx.data_offset + g_ctx.data_len;
if (g_ctx.view_cursor < g_ctx.data_offset
|| g_ctx.view_cursor >= end_addr)
return;
@ -440,37 +462,52 @@ app_draw_footer (void)
int64_t len = end_addr - g_ctx.view_cursor;
uint8_t *cursor = g_ctx.data + (g_ctx.view_cursor - g_ctx.data_offset);
// TODO: convert endianity, show full numbers
uint8_t copy[8] = {};
memcpy (copy, cursor, MIN (len, 8));
if (g_ctx.endianity == ENDIANITY_BE)
for (int i = 0; i < 4; i++)
{
uint8_t tmp = copy[7 - i];
copy[7 - i] = copy[i];
copy[i] = tmp;
}
// TODO: make the headers bold
const char *coding = "??";
const char *coding = g_ctx.endianity == ENDIANITY_LE ? "le" : "be";
if (len >= 1)
{
str_append_printf (&x, "x8 %02x", cursor[0]);
str_append_printf (&u, "u8 %4u", cursor[0]);
str_append_printf (&s, "s8 %4d", cursor[0]);
str_append_printf (&x, "x8 %02x", copy[0]);
str_append_printf (&u, "u8 %4u", copy[0]);
str_append_printf (&s, "s8 %4d", copy[0]);
}
if (len >= 2)
{
str_append_printf (&x, " x16%s %04x", coding, cursor[0]);
str_append_printf (&u, " u16%s %6u", coding, cursor[0]);
str_append_printf (&s, " s16%s %6d", coding, cursor[0]);
uint16_t val = copy[0] | copy[1] << 8;
str_append_printf (&x, " x16%s %04x", coding, val);
str_append_printf (&u, " u16%s %6u", coding, val);
str_append_printf (&s, " s16%s %6d", coding, val);
}
if (len >= 4)
{
str_append_printf (&x, " x32%s %08x", coding, cursor[0]);
str_append_printf (&u, " u32%s %11u", coding, cursor[0]);
str_append_printf (&s, " s32%s %11d", coding, cursor[0]);
uint32_t val = copy[0] | copy[1] << 8 | copy[2] << 16 | copy[3] << 24;
str_append_printf (&x, " x32%s %08x", coding, val);
str_append_printf (&u, " u32%s %11u", coding, val);
str_append_printf (&s, " s32%s %11d", coding, val);
}
if (len >= 8)
{
str_append_printf (&x, " x64%s %016x", coding, cursor[0]);
str_append_printf (&u, " u64%s %20u", coding, cursor[0]);
str_append_printf (&s, " s64%s %20d", coding, cursor[0]);
uint64_t val = copy[0] | copy[1] << 8 | copy[2] << 16 | copy[3] << 24
| (uint64_t) copy[4] << 32 | (uint64_t) copy[5] << 40
| (uint64_t) copy[6] << 48 | (uint64_t) copy[7] << 56;
str_append_printf (&x, " x64%s %016" PRIx64, coding, val);
str_append_printf (&u, " u64%s %20" PRIu64, coding, val);
str_append_printf (&s, " s64%s %20" PRId64, coding, val);
}
app_write_line (x.str, APP_ATTR (HEADER));
app_write_line (u.str, APP_ATTR (HEADER));
app_write_line (s.str, APP_ATTR (HEADER));
app_write_line (x.str, APP_ATTR (FOOTER));
app_write_line (u.str, APP_ATTR (FOOTER));
app_write_line (s.str, APP_ATTR (FOOTER));
str_free (&x);
str_free (&u);
@ -490,7 +527,7 @@ app_on_refresh (void *user_data)
int64_t diff = g_ctx.view_cursor - g_ctx.view_top;
int y = diff / ROW_SIZE;
int x = diff % ROW_SIZE;
move (y, x + 10 + x/8 + x/2);
move (y, 10 + x*2 + g_ctx.view_skip_nibble + x/8 + x/2);
refresh ();
}
@ -501,21 +538,22 @@ app_on_refresh (void *user_data)
static bool
app_fix_view_range (void)
{
if (g_ctx.item_top < 0)
if (g_ctx.view_top < g_ctx.data_offset / ROW_SIZE * ROW_SIZE)
{
g_ctx.item_top = 0;
g_ctx.view_top = g_ctx.data_offset / ROW_SIZE * ROW_SIZE;
app_invalidate ();
return false;
}
// If the contents are at least as long as the screen, always fill it
int max_item_top = (int) g_ctx.item_count - app_visible_items ();
int64_t max_view_top = (g_ctx.data_offset + g_ctx.data_len - 1)
/ ROW_SIZE * ROW_SIZE - app_visible_items () * ROW_SIZE;
// But don't let that suggest a negative offset
max_item_top = MAX (max_item_top, 0);
max_view_top = MAX (max_view_top, 0);
if (g_ctx.item_top > max_item_top)
if (g_ctx.view_top > max_view_top)
{
g_ctx.item_top = max_item_top;
g_ctx.view_top = max_view_top;
app_invalidate ();
return false;
}
@ -526,7 +564,7 @@ app_fix_view_range (void)
static bool
app_scroll (int n)
{
g_ctx.item_top += n;
g_ctx.view_top += n * ROW_SIZE;
app_invalidate ();
return app_fix_view_range ();
}
@ -534,15 +572,12 @@ app_scroll (int n)
static void
app_ensure_selection_visible (void)
{
if (g_ctx.item_selected < 0)
return;
int too_high = g_ctx.item_top - g_ctx.item_selected;
int too_high = g_ctx.view_top / ROW_SIZE - g_ctx.view_cursor / ROW_SIZE;
if (too_high > 0)
app_scroll (-too_high);
int too_low = g_ctx.item_selected
- (g_ctx.item_top + app_visible_items () - 1);
int too_low = g_ctx.view_cursor / ROW_SIZE
- (g_ctx.view_top / ROW_SIZE + app_visible_items () - 1);
if (too_low > 0)
app_scroll (too_low);
}
@ -550,12 +585,13 @@ app_ensure_selection_visible (void)
static bool
app_move_selection (int diff)
{
int fixed = g_ctx.item_selected += diff;
fixed = MAX (fixed, 0);
fixed = MIN (fixed, (int) g_ctx.item_count - 1);
// TODO: disallow partial up/down movement
int64_t fixed = g_ctx.view_cursor += diff * ROW_SIZE;
fixed = MAX (fixed, g_ctx.data_offset);
fixed = MIN (fixed, g_ctx.data_offset + g_ctx.data_len - 1);
bool result = g_ctx.item_selected != fixed;
g_ctx.item_selected = fixed;
bool result = g_ctx.view_cursor != fixed;
g_ctx.view_cursor = fixed;
app_invalidate ();
app_ensure_selection_visible ();
@ -570,8 +606,7 @@ enum action
ACTION_QUIT,
ACTION_REDRAW,
ACTION_CHOOSE,
ACTION_DELETE,
ACTION_TOGGLE_ENDIANITY,
ACTION_SCROLL_UP,
ACTION_SCROLL_DOWN,
@ -603,31 +638,36 @@ app_process_action (enum action action)
app_invalidate ();
break;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
case ACTION_TOGGLE_ENDIANITY:
g_ctx.endianity = (g_ctx.endianity == ENDIANITY_LE)
? ENDIANITY_BE : ENDIANITY_LE;
app_invalidate ();
break;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
// XXX: these should rather be parametrized
case ACTION_SCROLL_UP:
app_scroll (-3);
app_scroll (-1);
break;
case ACTION_SCROLL_DOWN:
app_scroll (3);
app_scroll (1);
break;
case ACTION_GOTO_TOP:
if (g_ctx.item_count)
{
g_ctx.item_selected = 0;
g_ctx.view_cursor = g_ctx.data_offset;
app_ensure_selection_visible ();
app_invalidate ();
}
break;
case ACTION_GOTO_BOTTOM:
if (g_ctx.item_count)
{
g_ctx.item_selected = (int) g_ctx.item_count - 1;
if (!g_ctx.data_len)
break;
g_ctx.view_cursor = g_ctx.data_offset + g_ctx.data_len - 1;
app_ensure_selection_visible ();
app_invalidate ();
}
break;
case ACTION_GOTO_PAGE_PREVIOUS:
@ -646,10 +686,28 @@ app_process_action (enum action action)
app_move_selection (1);
break;
case ACTION_LEFT:
// TODO: decrement cursor, check bounds, invalidate
if (g_ctx.view_skip_nibble)
g_ctx.view_skip_nibble = false;
else
{
// TODO: check bounds
g_ctx.view_skip_nibble = true;
g_ctx.view_cursor--;
}
app_ensure_selection_visible ();
app_invalidate ();
break;
case ACTION_RIGHT:
// TODO: increment cursor, check bounds, invalidate
if (!g_ctx.view_skip_nibble)
g_ctx.view_skip_nibble = true;
else
{
// TODO: check bounds
g_ctx.view_skip_nibble = false;
g_ctx.view_cursor++;
}
app_ensure_selection_visible ();
app_invalidate ();
break;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@ -670,16 +728,24 @@ app_process_left_mouse_click (int line, int column)
{
if (line == app_visible_items ())
{
// TODO: LE/BE switch, maybe something else
if (column < COLS - 7
|| column >= COLS - 5)
return false;
// TODO: LE/BE switch
}
else if (line < app_visible_items ())
{
int row_index = line;
if (row_index < 0
|| row_index >= (int) g_ctx.item_count - g_ctx.item_top)
if (line < 0)
return false;
g_ctx.item_selected = row_index + g_ctx.item_top;
// TODO: convert and check "column"
int offset = 0;
if (column < 10 || column >= 50)
return false;
// TODO: check if the result is within bounds and return false if not
g_ctx.view_cursor = g_ctx.view_top + line * ROW_SIZE + offset;
app_invalidate ();
}
return true;
@ -712,27 +778,30 @@ g_default_bindings[] =
{ "Escape", ACTION_QUIT },
{ "q", ACTION_QUIT },
{ "C-l", ACTION_REDRAW },
// TODO: Tab switches endianity
{ "Tab", ACTION_TOGGLE_ENDIANITY },
{ "Home", ACTION_GOTO_TOP },
{ "End", ACTION_GOTO_BOTTOM },
{ "M-<", ACTION_GOTO_TOP },
{ "M->", ACTION_GOTO_BOTTOM },
{ "Up", ACTION_UP },
{ "Down", ACTION_DOWN },
{ "k", ACTION_UP },
{ "j", ACTION_DOWN },
{ "PageUp", ACTION_GOTO_PAGE_PREVIOUS },
{ "PageDown", ACTION_GOTO_PAGE_NEXT },
{ "C-p", ACTION_UP },
{ "C-n", ACTION_DOWN },
{ "C-b", ACTION_GOTO_PAGE_PREVIOUS },
{ "C-f", ACTION_GOTO_PAGE_NEXT },
// TODO: C-e and C-y scroll up and down
// Not sure how to set these up, they're pretty arbitrary so far
{ "Enter", ACTION_CHOOSE },
{ "Delete", ACTION_DELETE },
{ "Up", ACTION_UP },
{ "Down", ACTION_DOWN },
{ "Left", ACTION_LEFT },
{ "Right", ACTION_RIGHT },
{ "k", ACTION_UP },
{ "j", ACTION_DOWN },
{ "h", ACTION_LEFT },
{ "l", ACTION_RIGHT },
{ "C-p", ACTION_UP },
{ "C-n", ACTION_DOWN },
{ "C-y", ACTION_SCROLL_UP },
{ "C-e", ACTION_SCROLL_DOWN },
};
static bool
@ -935,15 +1004,15 @@ app_init_poller_events (void)
/// Decode size arguments according to similar rules to those that dd(1) uses;
/// we support octal and hexadecimal numbers but they clash with suffixes
static bool
decode_size (const char *s, uint64_t *out)
decode_size (const char *s, int64_t *out)
{
char *end;
errno = 0;
uint64_t n = strtoul (s, &end, 0);
if (errno != 0 || end == s)
int64_t n = strtol (s, &end, 0);
if (errno != 0 || end == s || n < 0)
return false;
uint64_t f = 1;
int64_t f = 1;
switch (*end)
{
case 'c': f = 1 << 0; end++; break;
@ -954,7 +1023,7 @@ decode_size (const char *s, uint64_t *out)
case 'M': f = 1 << 20; if (*++end == 'B') { f = 1e6; end++; } break;
case 'G': f = 1 << 30; if (*++end == 'B') { f = 1e9; end++; } break;
}
if (*end || n > UINT64_MAX / f)
if (*end || n > INT64_MAX / f)
return false;
*out = n * f;
@ -977,7 +1046,7 @@ main (int argc, char *argv[])
struct opt_handler oh;
opt_handler_init (&oh, argc, argv, opts, "[FILE]", "Hex viewer.");
uint64_t size_limit = 1 << 30;
int64_t size_limit = 1 << 30;
int c;
while ((c = opt_handler_get (&oh)) != -1)
@ -1049,7 +1118,7 @@ main (int argc, char *argv[])
struct str buf;
str_init (&buf);
while (buf.len < size_limit)
while (buf.len < (size_t) size_limit)
{
str_ensure_space (&buf, 8192);
ssize_t n_read = read (input_fd, buf.str + buf.len,