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/*
* hex -- hex viewer
*
* Copyright (c) 2016 - 2017, Přemysl Eric Janouch <p@janouch.name>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "config.h"
// 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( FOOTER, "footer", -1, -1, 0 ) \
XX( FOOTER_HL, "footer_hl", -1, -1, A_BOLD ) \
/* Bar */ \
XX( BAR, "bar", -1, -1, A_REVERSE ) \
XX( BAR_HL, "bar_hl", -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 ) \
/* Field highlights */ \
XX( C1, "c1", 22, 194, 0 ) \
XX( C2, "c2", 88, 224, 0 ) \
XX( C3, "c3", 58, 229, 0 ) \
XX( C4, "c4", 20, 189, 0 ) \
/* These are for debugging only */ \
XX( WARNING, "warning", 3, -1, 0 ) \
XX( ERROR, "error", 1, -1, 0 )
enum
{
#define XX(name, config, fg_, bg_, attrs_) ATTRIBUTE_ ## name,
ATTRIBUTE_TABLE (XX)
#undef XX
ATTRIBUTE_COUNT
};
// User data for logger functions to enable formatted logging
#define print_fatal_data ((void *) ATTRIBUTE_ERROR)
#define print_error_data ((void *) ATTRIBUTE_ERROR)
#define print_warning_data ((void *) ATTRIBUTE_WARNING)
#define LIBERTY_WANT_POLLER
#define LIBERTY_WANT_ASYNC
#include "liberty/liberty.c"
#include "liberty/liberty-tui.c"
#include <locale.h>
#include <termios.h>
#ifndef TIOCGWINSZ
#include <sys/ioctl.h>
#endif // ! TIOCGWINSZ
#include "termo.h"
#ifdef HAVE_LUA
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <dirent.h>
#endif // HAVE_LUA
#define APP_TITLE PROGRAM_NAME ///< Left top corner
// --- Utilities ---------------------------------------------------------------
// The standard endwin/refresh sequence makes the terminal flicker
static void
update_curses_terminal_size (void)
{
#if defined (HAVE_RESIZETERM) && defined (TIOCGWINSZ)
struct winsize size;
if (!ioctl (STDOUT_FILENO, TIOCGWINSZ, (char *) &size))
{
char *row = getenv ("LINES");
char *col = getenv ("COLUMNS");
unsigned long tmp;
resizeterm (
(row && xstrtoul (&tmp, row, 10)) ? tmp : size.ws_row,
(col && xstrtoul (&tmp, col, 10)) ? tmp : size.ws_col);
}
#else // HAVE_RESIZETERM && TIOCGWINSZ
endwin ();
refresh ();
#endif // HAVE_RESIZETERM && TIOCGWINSZ
}
// --- Application -------------------------------------------------------------
enum
{
ROW_SIZE = 16, ///< How many bytes on a row
};
enum endianity
{
ENDIANITY_LE, ///< Little endian
ENDIANITY_BE ///< Big endian
};
struct mark
{
int64_t offset; ///< Offset of the mark
int64_t len; ///< Length of the mark
size_t description; ///< Textual description string offset
};
// XXX: can we avoid constructing the marks_by_offset lookup array?
// How much memory is it even going to consume in reality?
/// This is the final result suitable for display, including unmarked areas.
/// We might infer `color` from the index of this entry but then unmarked areas
/// would skip a color, which is undesired.
struct marks_by_offset
{
int64_t offset; ///< Offset in the file
size_t marks; ///< Offset into "offset_entries"
int color; ///< Color of the area until next offset
};
static struct app_context
{
// Event loop:
struct poller poller; ///< Poller
bool quitting; ///< Quit signal for the event loop
bool polling; ///< The event loop is running
struct poller_fd tty_event; ///< Terminal input event
struct poller_fd signal_event; ///< Signal FD event
#ifdef HAVE_LUA
lua_State *L; ///< Lua state
int ref_format; ///< Reference to "string.format"
struct str_map coders; ///< Map of coders by name
#endif // HAVE_LUA
// Data:
char *message; ///< Last logged message
int message_attr; ///< Attributes for the logged message
struct config config; ///< Program configuration
char *filename; ///< Target filename
uint8_t *data; ///< Target data
int64_t data_len; ///< Length of the data
int64_t data_offset; ///< Offset of the data within the file
// Field marking:
ARRAY (struct mark, marks) ///< Marks
struct str mark_strings; ///< Storage for mark descriptions
ARRAY (struct marks_by_offset, marks_by_offset)
ARRAY (struct mark *, offset_entries)
// View:
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:
struct poller_idle refresh_event; ///< Refresh the screen
// Terminal:
termo_t *tk; ///< termo handle
struct poller_timer tk_timer; ///< termo timeout timer
bool locale_is_utf8; ///< The locale is Unicode
struct attrs attrs[ATTRIBUTE_COUNT];
}
g_ctx;
/// Shortcut to retrieve named terminal attributes
#define APP_ATTR(name) g_ctx.attrs[ATTRIBUTE_ ## name].attrs
// --- Configuration -----------------------------------------------------------
static struct config_schema g_config_colors[] =
{
#define XX(name_, config, fg_, bg_, attrs_) \
{ .name = config, .type = CONFIG_ITEM_STRING },
ATTRIBUTE_TABLE (XX)
#undef XX
{}
};
static const char *
get_config_string (struct config_item *root, const char *key)
{
struct config_item *item = config_item_get (root, key, NULL);
hard_assert (item);
if (item->type == CONFIG_ITEM_NULL)
return NULL;
hard_assert (config_item_type_is_string (item->type));
return item->value.string.str;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
load_config_colors (struct config_item *subtree, void *user_data)
{
config_schema_apply_to_object (g_config_colors, subtree, user_data);
// The attributes cannot be changed dynamically right now, so it doesn't
// make much sense to make use of "on_change" callbacks either.
// For simplicity, we should reload the entire table on each change anyway.
const char *value;
#define XX(name, config, fg_, bg_, attrs_) \
if ((value = get_config_string (subtree, config))) \
g_ctx.attrs[ATTRIBUTE_ ## name] = attrs_decode (value);
ATTRIBUTE_TABLE (XX)
#undef XX
}
static void
app_load_configuration (void)
{
struct config *config = &g_ctx.config;
config_register_module (config, "colors", load_config_colors, NULL);
// Bootstrap configuration, so that we can access schema items at all
config_load (config, config_item_object ());
char *filename = resolve_filename
(PROGRAM_NAME ".conf", resolve_relative_config_filename);
if (!filename)
return;
struct error *e = NULL;
struct config_item *root = config_read_from_file (filename, &e);
free (filename);
if (e)
{
print_error ("error loading configuration: %s", e->message);
error_free (e);
exit (EXIT_FAILURE);
}
if (root)
{
config_load (&g_ctx.config, root);
config_schema_call_changed (g_ctx.config.root);
}
}
// --- Application -------------------------------------------------------------
static void
app_init_attributes (void)
{
#define XX(name, config, fg_, bg_, attrs_) \
g_ctx.attrs[ATTRIBUTE_ ## name].fg = fg_; \
g_ctx.attrs[ATTRIBUTE_ ## name].bg = bg_; \
g_ctx.attrs[ATTRIBUTE_ ## name].attrs = attrs_;
ATTRIBUTE_TABLE (XX)
#undef XX
}
static void
app_init_context (void)
{
poller_init (&g_ctx.poller);
g_ctx.config = config_make ();
ARRAY_INIT (g_ctx.marks);
g_ctx.mark_strings = str_make ();
ARRAY_INIT (g_ctx.marks_by_offset);
ARRAY_INIT (g_ctx.offset_entries);
// This is also approximately what libunistring does internally,
// since the locale name is canonicalized by locale_charset().
// Note that non-Unicode locales are handled pretty inefficiently.
g_ctx.locale_is_utf8 = !strcasecmp_ascii (locale_charset (), "UTF-8");
app_init_attributes ();
}
static void
app_init_terminal (void)
{
TERMO_CHECK_VERSION;
if (!(g_ctx.tk = termo_new (STDIN_FILENO, NULL, 0)))
abort ();
if (!initscr () || nonl () == ERR)
abort ();
// By default we don't use any colors so they're not required...
if (start_color () == ERR
|| use_default_colors () == ERR
|| COLOR_PAIRS <= ATTRIBUTE_COUNT)
return;
for (int a = 0; a < ATTRIBUTE_COUNT; a++)
{
// ...thus we can reset back to defaults even after initializing some
if (g_ctx.attrs[a].fg >= COLORS || g_ctx.attrs[a].fg < -1
|| g_ctx.attrs[a].bg >= COLORS || g_ctx.attrs[a].bg < -1)
{
// FIXME: we need a 256color default palette that fails gracefully
// to something like underlined fields
app_init_attributes ();
return;
}
init_pair (a + 1, g_ctx.attrs[a].fg, g_ctx.attrs[a].bg);
g_ctx.attrs[a].attrs |= COLOR_PAIR (a + 1);
}
}
static void
app_free_context (void)
{
config_free (&g_ctx.config);
poller_free (&g_ctx.poller);
free (g_ctx.marks);
str_free (&g_ctx.mark_strings);
free (g_ctx.marks_by_offset);
free (g_ctx.offset_entries);
free (g_ctx.message);
free (g_ctx.filename);
free (g_ctx.data);
if (g_ctx.tk)
termo_destroy (g_ctx.tk);
}
static void
app_quit (void)
{
g_ctx.quitting = true;
g_ctx.polling = false;
}
static bool
app_is_character_in_locale (ucs4_t ch)
{
// Avoid the overhead joined with calling iconv() for all characters.
if (g_ctx.locale_is_utf8)
return true;
// The library really creates a new conversion object every single time
// and doesn't provide any smarter APIs. Luckily, most users use UTF-8.
size_t len;
char *tmp = u32_conv_to_encoding (locale_charset (), iconveh_error,
&ch, 1, NULL, NULL, &len);
if (!tmp)
return false;
free (tmp);
return true;
}
// --- Field marking -----------------------------------------------------------
/// Find the "marks_by_offset" span covering the offset (if any)
static ssize_t
app_find_marks (int64_t offset)
{
ssize_t min = 0, end = g_ctx.marks_by_offset_len;
while (min < end)
{
ssize_t mid = min + (end - min) / 2;
if (offset >= g_ctx.marks_by_offset[mid].offset)
min = mid + 1;
else
end = mid;
}
return min - 1;
}
static struct marks_by_offset *
app_marks_at_offset (int64_t offset)
{
ssize_t i = app_find_marks (offset);
if (i < 0 || (size_t) i >= g_ctx.marks_by_offset_len)
return NULL;
struct marks_by_offset *marks = &g_ctx.marks_by_offset[i];
if (marks->offset > offset)
return NULL;
return marks;
}
static int
app_mark_cmp (const void *first, const void *second)
{
const struct mark *a = first, *b = second;
// This ordering is pretty much arbitrary, seemed to make sense
if (a->offset < b->offset) return -1;
if (a->offset > b->offset) return 1;
if (a->len < b->len) return 1;
if (a->len > b->len) return -1;
return 0;
}
static size_t
app_store_marks (struct mark **entries, size_t len)
{
size_t result = g_ctx.offset_entries_len;
ARRAY_RESERVE (g_ctx.offset_entries, len);
memcpy (g_ctx.offset_entries + g_ctx.offset_entries_len, entries,
sizeof *entries * len);
g_ctx.offset_entries_len += len;
return result;
}
/// Flattens marks into sequential non-overlapping spans suitable for search
/// by offset, assigning different colors to them in the process:
/// @code
/// ________ _______ ___
/// |________|__|_______| |___|
/// |_________|
/// ___ ____ __ _ _____ ___ ___
/// |___|____|__|_|_____|___|___|
/// @endcode
static void
app_flatten_marks (void)
{
qsort (g_ctx.marks, g_ctx.marks_len, sizeof *g_ctx.marks, app_mark_cmp);
if (!g_ctx.marks_len)
return;
ARRAY (struct mark *, current)
ARRAY_INIT (current);
int current_color = 0;
// Make offset zero actually point to an empty entry
g_ctx.offset_entries[g_ctx.offset_entries_len++] = NULL;
struct mark *next = g_ctx.marks;
struct mark *end = next + g_ctx.marks_len;
while (current_len || next < end)
{
// Find the closest offset at which marks change
int64_t closest = g_ctx.data_offset + g_ctx.data_len;
if (next < end)
closest = next->offset;
for (size_t i = 0; i < current_len; i++)
closest = MIN (closest, current[i]->offset + current[i]->len);
// Remove from "current" marks that have ended
for (size_t i = 0; i < current_len; )
if (closest == current[i]->offset + current[i]->len)
memmove (current + i, current + i + 1,
(--current_len - i) * sizeof *current);
else
i++;
// Add any new marks at "closest"
while (next < end && next->offset == closest)
{
current[current_len++] = next++;
ARRAY_RESERVE (current, 1);
}
current[current_len] = NULL;
// Save marks at that offset to be used by rendering
size_t marks = 0;
int color = -1;
if (current_len)
{
marks = app_store_marks (current, current_len + 1);
color = ATTRIBUTE_C1 + current_color++;
current_color %= 4;
}
ARRAY_RESERVE (g_ctx.marks_by_offset, 1);
g_ctx.marks_by_offset[g_ctx.marks_by_offset_len++] =
(struct marks_by_offset) { closest, marks, color };
}
free (current);
}
// --- Rendering ---------------------------------------------------------------
static void
app_invalidate (void)
{
poller_idle_set (&g_ctx.refresh_event);
}
static void
app_flush_buffer (struct row_buffer *buf, int width, chtype attrs)
{
row_buffer_align (buf, width, attrs);
row_buffer_flush (buf);
row_buffer_free (buf);
}
/// Write the given UTF-8 string padded with spaces.
/// @param[in] attrs Text attributes for the text, including padding.
static void
app_write_line (const char *str, chtype attrs)
{
struct row_buffer buf = row_buffer_make ();
row_buffer_append (&buf, str, attrs);
app_flush_buffer (&buf, COLS, attrs);
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static int
app_visible_rows (void)
{
return MAX (0, LINES - 1 /* bar */ - 3 /* decoder */ - !!g_ctx.message);
}
static void
app_make_row (struct row_buffer *buf, int64_t addr, int attrs)
{
char *row_addr_str = xstrdup_printf ("%08" PRIx64, addr);
row_buffer_append (buf, row_addr_str, attrs);
free (row_addr_str);
struct row_buffer ascii = row_buffer_make ();
row_buffer_append (&ascii, " ", attrs);
int64_t end_addr = g_ctx.data_offset + g_ctx.data_len;
const char *hexa = "0123456789abcdef";
for (int x = 0; x < ROW_SIZE; x++)
{
if (x % 8 == 0) row_buffer_append (buf, " ", attrs);
if (x % 2 == 0) row_buffer_append (buf, " ", attrs);
int64_t cell_addr = addr + x;
if (cell_addr < g_ctx.data_offset
|| cell_addr >= end_addr)
{
row_buffer_append (buf, " ", attrs);
row_buffer_append (&ascii, " ", attrs);
}
else
{
int attrs_mark = attrs;
struct marks_by_offset *marks = app_marks_at_offset (cell_addr);
if (marks && marks->color >= 0)
attrs_mark = g_ctx.attrs[marks->color].attrs;
int highlight = 0;
if (cell_addr >= g_ctx.view_cursor
&& cell_addr < g_ctx.view_cursor + 8)
highlight = A_UNDERLINE;
// TODO: leave it up to the user to decide what should be colored
uint8_t cell = g_ctx.data[cell_addr - g_ctx.data_offset];
row_buffer_append (buf,
(char[3]) { hexa[cell >> 4], hexa[cell & 7], 0 },
attrs | highlight);
char s[2] = { (cell >= 32 && cell < 127) ? cell : '.', 0 };
row_buffer_append (&ascii, s, attrs_mark | highlight);
}
}
row_buffer_append_buffer (buf, &ascii);
row_buffer_free (&ascii);
}
static void
app_draw_view (void)
{
move (0, 0);
int64_t end_addr = g_ctx.data_offset + g_ctx.data_len;
for (int y = 0; y < app_visible_rows (); y++)
{
int64_t addr = g_ctx.view_top + y * ROW_SIZE;
if (addr >= end_addr)
break;
int attrs = (addr / ROW_SIZE & 1) ? APP_ATTR (ODD) : APP_ATTR (EVEN);
struct row_buffer buf = row_buffer_make ();
app_make_row (&buf, addr, attrs);
app_flush_buffer (&buf, COLS, attrs);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
app_draw_info (void)
{
const struct marks_by_offset *marks;
if (!(marks = app_marks_at_offset (g_ctx.view_cursor)))
return;
int x_offset = 70;
struct mark *mark, **iter = g_ctx.offset_entries + marks->marks;
for (int y = 0; y < app_visible_rows (); y++)
{
// TODO: we can use the field background
// TODO: we can keep going through subsequent fields to fill the column
if (!(mark = *iter++))
break;
struct row_buffer buf = row_buffer_make ();
row_buffer_append (&buf,
g_ctx.mark_strings.str + mark->description, 0);
move (y, x_offset);
app_flush_buffer (&buf, COLS - x_offset, 0);
}
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static uint64_t
app_decode (const uint8_t *p, size_t len, enum endianity endianity)
{
uint64_t val = 0;
if (endianity == ENDIANITY_BE)
for (size_t i = 0; i < len; i++)
val = val << 8 | (uint64_t) p[i];
else
while (len--)
val = val << 8 | (uint64_t) p[len];
return val;
}
static void
app_write_footer (struct row_buffer *b, char id, int len, const char *fmt, ...)
ATTRIBUTE_PRINTF (4, 5);
static void
app_footer_field (struct row_buffer *b, char id, int len, const char *fmt, ...)
{
const char *coding;
if (len <= 1)
coding = "";
else if (g_ctx.endianity == ENDIANITY_LE)
coding = "le";
else if (g_ctx.endianity == ENDIANITY_BE)
coding = "be";
char *key = xstrdup_printf ("%c%d%s", id, len * 8, coding);
row_buffer_append (b, key, APP_ATTR (FOOTER_HL));
free (key);
va_list ap;
va_start (ap, fmt);
struct str value = str_make ();
str_append_vprintf (&value, fmt, ap);
va_end (ap);
row_buffer_append (b, value.str, APP_ATTR (FOOTER));
str_free (&value);
}
static void
app_draw_footer (void)
{
move (app_visible_rows (), 0);
struct row_buffer buf = row_buffer_make ();
row_buffer_append (&buf, APP_TITLE, APP_ATTR (BAR));
if (g_ctx.filename)
{
row_buffer_append (&buf, " ", APP_ATTR (BAR));
char *filename = (char *) u8_strconv_from_locale (g_ctx.filename);
row_buffer_append (&buf, filename, APP_ATTR (BAR_HL));
free (filename);
}
struct str right = str_make ();
str_append_printf (&right, " %08" PRIx64, g_ctx.view_cursor);
str_append (&right, g_ctx.endianity == ENDIANITY_LE ? " LE " : " BE ");
int64_t top = g_ctx.view_top;
int64_t bot = g_ctx.view_top + app_visible_rows () * 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
{
int64_t end_addr = g_ctx.data_offset + g_ctx.data_len;
int64_t cur = g_ctx.view_top / ROW_SIZE;
int64_t max = (end_addr - 1) / ROW_SIZE - app_visible_rows () + 1;
cur -= g_ctx.data_offset / ROW_SIZE;
max -= g_ctx.data_offset / ROW_SIZE;
str_append_printf (&right, "%2d%%", (int) (100 * cur / max));
}
row_buffer_align (&buf, COLS - right.len, APP_ATTR (BAR));
row_buffer_append (&buf, right.str, APP_ATTR (BAR));
app_flush_buffer (&buf, COLS, APP_ATTR (BAR));
str_free (&right);
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;
int64_t len = end_addr - g_ctx.view_cursor;
uint8_t *p = g_ctx.data + (g_ctx.view_cursor - g_ctx.data_offset);
struct row_buffer x = row_buffer_make ();
struct row_buffer u = row_buffer_make ();
struct row_buffer s = row_buffer_make ();
if (len >= 1)
{
app_footer_field (&x, 'x', 1, " %02x ", p[0]);
app_footer_field (&u, 'u', 1, " %4u ", p[0]);
app_footer_field (&s, 's', 1, " %4d ", (int8_t) p[0]);
}
if (len >= 2)
{
uint16_t val = app_decode (p, 2, g_ctx.endianity);
app_footer_field (&x, 'x', 2, " %04x ", val);
app_footer_field (&u, 'u', 2, " %6u ", val);
app_footer_field (&s, 's', 2, " %6d ", (int16_t) val);
}
if (len >= 4)
{
uint32_t val = app_decode (p, 4, g_ctx.endianity);
app_footer_field (&x, 'x', 4, " %08x ", val);
app_footer_field (&u, 'u', 4, " %11u ", val);
app_footer_field (&s, 's', 4, " %11d ", (int32_t) val);
}
if (len >= 8)
{
uint64_t val = app_decode (p, 8, g_ctx.endianity);
app_footer_field (&x, 'x', 8, " %016" PRIx64, val);
app_footer_field (&u, 'u', 8, " %20" PRIu64, val);
app_footer_field (&s, 's', 8, " %20" PRId64, (int64_t) val);
}
app_flush_buffer (&x, COLS, APP_ATTR (FOOTER));
app_flush_buffer (&u, COLS, APP_ATTR (FOOTER));
app_flush_buffer (&s, COLS, APP_ATTR (FOOTER));
if (g_ctx.message)
app_write_line (g_ctx.message, g_ctx.attrs[g_ctx.message_attr].attrs);
}
static void
app_on_refresh (void *user_data)
{
(void) user_data;
poller_idle_reset (&g_ctx.refresh_event);
erase ();
app_draw_view ();
app_draw_info ();
app_draw_footer ();
int64_t diff = g_ctx.view_cursor - g_ctx.view_top;
int64_t y = diff / ROW_SIZE;
int64_t x = diff % ROW_SIZE;
if (diff >= 0 && y < app_visible_rows ())
{
curs_set (1);
move (y, 10 + x*2 + g_ctx.view_skip_nibble + x/8 + x/2);
}
else
curs_set (0);
refresh ();
}
// --- Lua ---------------------------------------------------------------------
#ifdef HAVE_LUA
static void *
app_lua_alloc (void *ud, void *ptr, size_t o_size, size_t n_size)
{
(void) ud;
(void) o_size;
if (n_size)
return realloc (ptr, n_size);
free (ptr);
return NULL;
}
static int
app_lua_panic (lua_State *L)
{
// XXX: we might be able to do something better
print_fatal ("Lua panicked: %s", lua_tostring (L, -1));
lua_close (L);
exit (EXIT_FAILURE);
return 0;
}
static bool
app_lua_getfield (lua_State *L, int idx, const char *name,
int expected, bool optional)
{
int found = lua_getfield (L, idx, name);
if (found == expected)
return true;
if (optional && found == LUA_TNIL)
return false;
const char *message = optional
? "invalid field \"%s\" (found: %s, expected: %s or nil)"
: "invalid or missing field \"%s\" (found: %s, expected: %s)";
return luaL_error (L, message, name,
lua_typename (L, found), lua_typename (L, expected));
}
static int
app_lua_error_handler (lua_State *L)
{
luaL_traceback (L, L, luaL_checkstring (L, 1), 1);
return 1;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
struct app_lua_coder
{
int ref_detect; ///< Reference to the "detect" method
int ref_decode; ///< Reference to the "decode" method
};
static void
app_lua_coder_free (void *coder)
{
struct app_lua_coder *self = coder;
luaL_unref (g_ctx.L, LUA_REGISTRYINDEX, self->ref_decode);
luaL_unref (g_ctx.L, LUA_REGISTRYINDEX, self->ref_detect);
free (self);
}
static int
app_lua_register (lua_State *L)
{
luaL_checktype (L, 1, LUA_TTABLE);
(void) app_lua_getfield (L, 1, "type", LUA_TSTRING, false);
const char *type = lua_tostring (L, -1);
if (str_map_find (&g_ctx.coders, type))
luaL_error (L, "a coder has already been registered for `%s'", type);
(void) app_lua_getfield (L, 1, "detect", LUA_TFUNCTION, true);
(void) app_lua_getfield (L, 1, "decode", LUA_TFUNCTION, false);
struct app_lua_coder *coder = xcalloc (1, sizeof *coder);
coder->ref_decode = luaL_ref (L, LUA_REGISTRYINDEX);
coder->ref_detect = luaL_ref (L, LUA_REGISTRYINDEX);
str_map_set (&g_ctx.coders, type, coder);
return 0;
}
static luaL_Reg app_lua_library[] =
{
{ "register", app_lua_register },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
#define XLUA_CHUNK_METATABLE "chunk"
struct app_lua_chunk
{
int64_t offset; ///< Offset from start of file
int64_t len; ///< Length of the sequence
int64_t position; ///< Read position in the sequence
enum endianity endianity; ///< Read endianity
};
static struct app_lua_chunk *
app_lua_chunk_new (lua_State *L)
{
struct app_lua_chunk *chunk = lua_newuserdata (L, sizeof *chunk);
luaL_setmetatable (L, XLUA_CHUNK_METATABLE);
memset (chunk, 0, sizeof *chunk);
return chunk;
}
static int
app_lua_chunk_len (lua_State *L)
{
struct app_lua_chunk *self = luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
lua_pushinteger (L, self->len);
return 1;
}
/// Create a new subchunk following Lua's string.sub() semantics.
/// An implication is that it is not possible to go extend a chunk's bounds.
static int
app_lua_chunk_call (lua_State *L)
{
struct app_lua_chunk *self = luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
lua_Integer start = luaL_optinteger (L, 2, 1);
lua_Integer end = luaL_optinteger (L, 3, -1);
if (start < 0) start += self->len + 1;
if (end < 0) end += self->len + 1;
start = MAX (start, 1);
end = MIN (end, self->len);
struct app_lua_chunk *clone = app_lua_chunk_new (L);
clone->position = 0;
clone->endianity = self->endianity;
if (start > end)
{
// "start" can be too high and "end" can be too low;
// the length is zero, so the offset doesn't matter much anyway
clone->offset = self->offset;
clone->len = 0;
}
else
{
clone->offset = self->offset + start - 1;
clone->len = end - start + 1;
}
return 1;
}
static int
app_lua_chunk_index (lua_State *L)
{
struct app_lua_chunk *self = luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
const char *key = luaL_checkstring (L, 2);
if (luaL_getmetafield (L, 1, key))
return 1;
if (!strcmp (key, "offset"))
lua_pushinteger (L, self->offset);
else if (!strcmp (key, "endianity"))
lua_pushstring (L, self->endianity == ENDIANITY_LE ? "le" : "be");
else if (!strcmp (key, "position"))
lua_pushinteger (L, self->position + 1);
else if (!strcmp (key, "eof"))
lua_pushboolean (L, self->position >= self->len);
else
return luaL_argerror (L, 2, "not a readable property");
return 1;
}
static int
app_lua_chunk_newindex (lua_State *L)
{
struct app_lua_chunk *self = luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
const char *key = luaL_checkstring (L, 2);
if (!strcmp (key, "endianity"))
{
// Needs to be in the enum order
const char *options[] = { "le", "be" };
self->endianity = luaL_checkoption (L, 3, options[0], options);
}
else if (!strcmp (key, "position"))
{
lua_Integer position = luaL_checkinteger (L, 3);
if (position < 1 || position > self->len + 1)
return luaL_error (L, "position out of range: %I", position);
self->position = position - 1;
}
else
return luaL_argerror (L, 2, "not a writable property");
return 0;
}
static void
app_lua_mark (int64_t offset, int64_t len, const char *desc)
{
// That would cause stupid entries, making trouble in marks_by_offset
if (len <= 0)
return;
ARRAY_RESERVE (g_ctx.marks, 1);
g_ctx.marks[g_ctx.marks_len++] =
(struct mark) { offset, len, g_ctx.mark_strings.len };
str_append (&g_ctx.mark_strings, desc);
str_append_c (&g_ctx.mark_strings, 0);
}
static int
app_lua_chunk_mark (lua_State *L)
{
struct app_lua_chunk *self = luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
int n_args = lua_gettop (L);
lua_rawgeti (L, LUA_REGISTRYINDEX, g_ctx.ref_format);
lua_insert (L, 2);
lua_call (L, n_args - 1, 1);
app_lua_mark (self->offset, self->len, luaL_checkstring (L, -1));
return 0;
}
/// Try to detect any registered type in the data and return its name
static int
app_lua_chunk_identify (lua_State *L)
{
(void) luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
struct str_map_iter iter = str_map_iter_make (&g_ctx.coders);
struct app_lua_coder *coder;
while ((coder = str_map_iter_next (&iter)))
{
if (coder->ref_detect == LUA_REFNIL)
continue;
lua_rawgeti (L, LUA_REGISTRYINDEX, coder->ref_detect);
// Clone the chunk first to reset its read position
lua_pushcfunction (L, app_lua_chunk_call);
lua_pushvalue (L, 1);
lua_call (L, 1, 1);
lua_call (L, 1, 1);
if (lua_toboolean (L, -1))
{
lua_pushstring (L, iter.link->key);
return 1;
}
lua_pop (L, 1);
}
return 0;
}
static int
app_lua_chunk_decode (lua_State *L)
{
(void) luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
const char *type = luaL_optstring (L, 2, NULL);
// TODO: further arguments should be passed to the decoding function
if (!type)
{
lua_pushcfunction (L, app_lua_chunk_identify);
lua_pushvalue (L, 1);
lua_call (L, 1, 1);
type = lua_tostring (L, -1);
}
// Can't identify -> can't decode, nothing to do here
if (!type)
return 0;
// While we could call "detect" here, just to be sure, some kinds may not
// even be detectable and it's better to leave it up to the plugin
struct app_lua_coder *coder = str_map_find (&g_ctx.coders, type);
if (!coder)
return luaL_error (L, "unknown type: %s", type);
lua_rawgeti (L, LUA_REGISTRYINDEX, coder->ref_decode);
lua_pushvalue (L, 1);
// TODO: the chunk could remember the name of the coder and prepend it
// to all marks set from the callback; then reset it back to NULL
lua_call (L, 1, 0);
return 0;
}
static int
app_lua_chunk_read (lua_State *L)
{
struct app_lua_chunk *self = luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
lua_Integer len = luaL_checkinteger (L, 2);
if (len < 0)
return luaL_argerror (L, 2, "invalid read length");
int64_t start = self->offset + self->position;
// XXX: or just return a shorter string in this case?
if (start + len > g_ctx.data_offset + g_ctx.data_len)
return luaL_argerror (L, 2, "chunk is too short");
lua_pushlstring (L, (char *) g_ctx.data + (start - g_ctx.data_offset), len);
self->position += len;
return 1;
}
/// Mark a field that has just been read from the chunk and advance position:
/// - the second argument, if present, is a simple format string for marking;
/// - the third argument, if present, is a filtering function.
///
/// I am aware of how ugly the implicit "string.format" is. Convenience wins.
static void
app_lua_chunk_finish_read
(lua_State *L, struct app_lua_chunk *self, int64_t len)
{
int n_args = lua_gettop (L) - 1;
if (n_args < 2)
{
self->position += len;
return;
}
// Prepare <string.format>, <format>, <value>
lua_rawgeti (L, LUA_REGISTRYINDEX, g_ctx.ref_format);
lua_pushvalue (L, 2);
int pre_filter_top = lua_gettop (L);
lua_pushvalue (L, -3);
// Transform the value if a filtering function is provided
if (n_args >= 3)
{
lua_pushvalue (L, 3);
lua_insert (L, -2);
lua_call (L, 1, LUA_MULTRET);
int n_ret = lua_gettop (L) - pre_filter_top;
// When no value has been returned, keep the old one
if (n_ret < 1)
lua_pushvalue (L, pre_filter_top - 2);
// Forward multiple return values to "string.format"
if (n_ret > 1)
{
lua_pushvalue (L, pre_filter_top - 1);
lua_insert (L, -n_ret - 1);
lua_call (L, n_ret, 1);
}
}
lua_call (L, 2, 1);
app_lua_mark (self->offset + self->position, len, lua_tostring (L, -1));
self->position += len;
lua_pop (L, 1);
}
static int
app_lua_chunk_cstring (lua_State *L)
{
struct app_lua_chunk *self = luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE);
void *s = g_ctx.data + (self->offset - g_ctx.data_offset) + self->position;
void *nil;
if (!(nil = memchr (s, '\0', self->len - self->position)))
return luaL_error (L, "unexpected EOF");
lua_pushlstring (L, s, nil - s);
app_lua_chunk_finish_read (L, self, nil - s + 1);
return 1;
}
/// Decode "len" bytes as a number starting at the current position in "self"
static uint64_t
app_lua_chunk_decode_int (lua_State *L, struct app_lua_chunk *self, size_t len)
{
if (self->position + (int64_t) len > self->len)
return luaL_error (L, "unexpected EOF");
void *s = g_ctx.data + (self->offset - g_ctx.data_offset) + self->position;
return app_decode (s, len, self->endianity);
}
#define APP_LUA_CHUNK_INT(name, type) \
static int \
app_lua_chunk_ ## name (lua_State *L) \
{ \
struct app_lua_chunk *self = \
luaL_checkudata (L, 1, XLUA_CHUNK_METATABLE); \
type v = app_lua_chunk_decode_int (L, self, sizeof v); \
lua_pushinteger (L, v); \
app_lua_chunk_finish_read (L, self, sizeof v); \
return 1; \
}
APP_LUA_CHUNK_INT (u8, uint8_t) APP_LUA_CHUNK_INT (s8, int8_t)
APP_LUA_CHUNK_INT (u16, uint16_t) APP_LUA_CHUNK_INT (s16, int16_t)
APP_LUA_CHUNK_INT (u32, uint32_t) APP_LUA_CHUNK_INT (s32, int32_t)
APP_LUA_CHUNK_INT (u64, uint64_t) APP_LUA_CHUNK_INT (s64, int64_t)
static luaL_Reg app_lua_chunk_table[] =
{
{ "__len", app_lua_chunk_len },
{ "__call", app_lua_chunk_call },
{ "__index", app_lua_chunk_index },
{ "__newindex", app_lua_chunk_newindex },
{ "mark", app_lua_chunk_mark },
{ "identify", app_lua_chunk_identify },
{ "decode", app_lua_chunk_decode },
{ "read", app_lua_chunk_read },
{ "cstring", app_lua_chunk_cstring },
{ "u8", app_lua_chunk_u8 },
{ "s8", app_lua_chunk_s8 },
{ "u16", app_lua_chunk_u16 },
{ "s16", app_lua_chunk_s16 },
{ "u32", app_lua_chunk_u32 },
{ "s32", app_lua_chunk_s32 },
{ "u64", app_lua_chunk_u64 },
{ "s64", app_lua_chunk_s64 },
{ NULL, NULL }
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void
app_lua_load_plugins (const char *plugin_dir)
{
DIR *dir;
if (!(dir = opendir (plugin_dir)))
{
if (errno != ENOENT)
print_error ("cannot open directory `%s': %s",
plugin_dir, strerror (errno));
return;
}
struct dirent *iter;
while ((errno = 0, iter = readdir (dir)))
{
const char *dot = strrchr (iter->d_name, '.');
if (!dot || strcmp (dot, ".lua"))
continue;
char *path = xstrdup_printf ("%s/%s", plugin_dir, iter->d_name);
lua_pushcfunction (g_ctx.L, app_lua_error_handler);
if (luaL_loadfile (g_ctx.L, path)
|| lua_pcall (g_ctx.L, 0, 0, -2))
exit_fatal ("Lua: %s", lua_tostring (g_ctx.L, -1));
lua_pop (g_ctx.L, 1);
free (path);
}
if (errno)
exit_fatal ("readdir: %s", strerror (errno));
closedir (dir);
}
static void
app_lua_init (void)
{
if (!(g_ctx.L = lua_newstate (app_lua_alloc, NULL)))
exit_fatal ("Lua initialization failed");
g_ctx.coders = str_map_make (app_lua_coder_free);
lua_atpanic (g_ctx.L, app_lua_panic);
luaL_openlibs (g_ctx.L);
luaL_checkversion (g_ctx.L);
// I don't want to reimplement this and the C function is not exported
hard_assert (lua_getglobal (g_ctx.L, LUA_STRLIBNAME));
hard_assert (lua_getfield (g_ctx.L, -1, "format"));
g_ctx.ref_format = luaL_ref (g_ctx.L, LUA_REGISTRYINDEX);
luaL_newlib (g_ctx.L, app_lua_library);
lua_setglobal (g_ctx.L, PROGRAM_NAME);
luaL_newmetatable (g_ctx.L, XLUA_CHUNK_METATABLE);
luaL_setfuncs (g_ctx.L, app_lua_chunk_table, 0);
lua_pop (g_ctx.L, 1);
struct strv v = strv_make ();
get_xdg_data_dirs (&v);
for (size_t i = 0; i < v.len; i++)
{
char *path = xstrdup_printf
("%s/%s", v.vector[i], PROGRAM_NAME "/plugins");
app_lua_load_plugins (path);
free (path);
}
strv_free (&v);
}
#endif // HAVE_LUA
// --- Actions -----------------------------------------------------------------
/// Checks what items are visible and returns if fixes were needed
static bool
app_fix_view_range (void)
{
int64_t data_view_start = g_ctx.data_offset / ROW_SIZE * ROW_SIZE;
if (g_ctx.view_top < data_view_start)
{
g_ctx.view_top = data_view_start;
app_invalidate ();
return false;
}
// If the contents are at least as long as the screen, always fill it
int64_t last_byte = g_ctx.data_offset + g_ctx.data_len - 1;
int64_t max_view_top =
(last_byte / ROW_SIZE - app_visible_rows () + 1) * ROW_SIZE;
// But don't let that suggest a negative offset
max_view_top = MAX (max_view_top, 0);
if (g_ctx.view_top > max_view_top)
{
g_ctx.view_top = max_view_top;
app_invalidate ();
return false;
}
return true;
}
/// Scroll down (positive) or up (negative) @a n items
static bool
app_scroll (int n)
{
g_ctx.view_top += n * ROW_SIZE;
app_invalidate ();
return app_fix_view_range ();
}
static void
app_ensure_selection_visible (void)
{
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.view_cursor / ROW_SIZE - g_ctx.view_top / ROW_SIZE
- app_visible_rows () + 1;
if (too_low > 0)
app_scroll (too_low);
}
static bool
app_move_cursor_by_rows (int diff)
{
// 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.view_cursor == fixed;
g_ctx.view_cursor = fixed;
app_invalidate ();
app_ensure_selection_visible ();
return result;
}
static bool
app_jump_to_marks (ssize_t i)
{
if (i < 0 || (size_t) i >= g_ctx.marks_by_offset_len)
return false;
g_ctx.view_cursor = g_ctx.marks_by_offset[i].offset;
g_ctx.view_skip_nibble = false;
app_invalidate ();
app_ensure_selection_visible ();
return true;
}
// --- User input handling -----------------------------------------------------
enum action
{
ACTION_NONE, ACTION_QUIT, ACTION_REDRAW, ACTION_TOGGLE_ENDIANITY,
ACTION_SCROLL_UP, ACTION_GOTO_TOP, ACTION_GOTO_PAGE_PREVIOUS,
ACTION_SCROLL_DOWN, ACTION_GOTO_BOTTOM, ACTION_GOTO_PAGE_NEXT,
ACTION_UP, ACTION_DOWN, ACTION_LEFT, ACTION_RIGHT,
ACTION_ROW_START, ACTION_ROW_END,
ACTION_FIELD_PREVIOUS, ACTION_FIELD_NEXT,
ACTION_COUNT
};
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
app_process_action (enum action action)
{
switch (action)
{
// XXX: these should rather be parametrized
case ACTION_SCROLL_UP: app_scroll (-1); break;
case ACTION_SCROLL_DOWN: app_scroll (1); break;
case ACTION_GOTO_TOP:
g_ctx.view_cursor = g_ctx.data_offset;
g_ctx.view_skip_nibble = false;
app_ensure_selection_visible ();
app_invalidate ();
break;
case ACTION_GOTO_BOTTOM:
if (!g_ctx.data_len)
return false;
g_ctx.view_cursor = g_ctx.data_offset + g_ctx.data_len - 1;
g_ctx.view_skip_nibble = false;
app_ensure_selection_visible ();
app_invalidate ();
break;
case ACTION_GOTO_PAGE_PREVIOUS:
app_scroll (-app_visible_rows ());
app_move_cursor_by_rows (-app_visible_rows ());
break;
case ACTION_GOTO_PAGE_NEXT:
app_scroll (app_visible_rows ());
app_move_cursor_by_rows (app_visible_rows ());
break;
case ACTION_UP: app_move_cursor_by_rows (-1); break;
case ACTION_DOWN: app_move_cursor_by_rows (1); break;
case ACTION_LEFT:
if (g_ctx.view_skip_nibble)
g_ctx.view_skip_nibble = false;
else
{
if (g_ctx.view_cursor <= g_ctx.data_offset)
return false;
g_ctx.view_skip_nibble = true;
g_ctx.view_cursor--;
app_ensure_selection_visible ();
}
app_invalidate ();
break;
case ACTION_RIGHT:
if (!g_ctx.view_skip_nibble)
g_ctx.view_skip_nibble = true;
else
{
if (g_ctx.view_cursor >= g_ctx.data_offset + g_ctx.data_len - 1)
return false;
g_ctx.view_skip_nibble = false;
g_ctx.view_cursor++;
app_ensure_selection_visible ();
}
app_invalidate ();
break;
case ACTION_ROW_START:
{
int64_t new = g_ctx.view_cursor / ROW_SIZE * ROW_SIZE;
new = MAX (new, g_ctx.data_offset);
new = MIN (new, g_ctx.data_offset + g_ctx.data_len - 1);
g_ctx.view_cursor = new;
g_ctx.view_skip_nibble = false;
app_invalidate ();
break;
}
case ACTION_ROW_END:
{
int64_t new = (g_ctx.view_cursor / ROW_SIZE + 1) * ROW_SIZE - 1;
new = MAX (new, g_ctx.data_offset);
new = MIN (new, g_ctx.data_offset + g_ctx.data_len - 1);
g_ctx.view_cursor = new;
g_ctx.view_skip_nibble = false;
app_invalidate ();
break;
}
case ACTION_FIELD_PREVIOUS:
{
ssize_t i = app_find_marks (g_ctx.view_cursor);
if (i >= 0 && (size_t) i < g_ctx.marks_by_offset_len
&& g_ctx.marks_by_offset[i].offset == g_ctx.view_cursor)
i--;
return app_jump_to_marks (i);
}
case ACTION_FIELD_NEXT:
return app_jump_to_marks (app_find_marks (g_ctx.view_cursor) + 1);
case ACTION_QUIT:
app_quit ();
case ACTION_NONE:
break;
case ACTION_REDRAW:
clear ();
app_invalidate ();
break;
case ACTION_TOGGLE_ENDIANITY:
g_ctx.endianity = (g_ctx.endianity == ENDIANITY_LE)
? ENDIANITY_BE : ENDIANITY_LE;
app_invalidate ();
break;
default:
return false;
}
return true;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static bool
app_process_left_mouse_click (int line, int column)
{
if (line < 0)
return false;
if (line == app_visible_rows ())
{
if (column < COLS - 7
|| column >= COLS - 5)
return false;
return app_process_action (ACTION_TOGGLE_ENDIANITY);
}
else if (line < app_visible_rows ())
{
// TODO: when holding a mouse button over a mark string,
// go to a locked mode that highlights that entire mark
// (probably by inverting colors)
// TODO: employ strict checking here before the autofix
int offset;
if (column >= 10 && column < 50)
{
offset = column - 10;
offset -= offset/5 + offset/21;
g_ctx.view_skip_nibble = offset % 2;
offset /= 2;
}
else if (column >= 52 && column < 68)
{
offset = column - 52;
g_ctx.view_skip_nibble = false;
}
else
return false;
g_ctx.view_cursor = g_ctx.view_top + line * ROW_SIZE + offset;
return app_move_cursor_by_rows (0);
}
return true;
}
static bool
app_process_mouse (termo_mouse_event_t type, int line, int column, int button)
{
if (type != TERMO_MOUSE_PRESS)
return true;
if (button == 1)
return app_process_left_mouse_click (line, column);
else if (button == 4)
return app_process_action (ACTION_SCROLL_UP);
else if (button == 5)
return app_process_action (ACTION_SCROLL_DOWN);
return false;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static struct binding
{
const char *key; ///< Key definition
enum action action; ///< Action to take
termo_key_t decoded; ///< Decoded key definition
}
g_default_bindings[] =
{
{ "Escape", ACTION_QUIT, {}},
{ "q", ACTION_QUIT, {}},
{ "C-l", ACTION_REDRAW, {}},
{ "Tab", ACTION_TOGGLE_ENDIANITY, {}},
{ "Home", ACTION_ROW_START, {}},
{ "End", ACTION_ROW_END, {}},
{ "M-<", ACTION_GOTO_TOP, {}},
{ "M->", ACTION_GOTO_BOTTOM, {}},
{ "g", ACTION_GOTO_TOP, {}},
{ "G", ACTION_GOTO_BOTTOM, {}},
{ "PageUp", ACTION_GOTO_PAGE_PREVIOUS, {}},
{ "PageDown", ACTION_GOTO_PAGE_NEXT, {}},
{ "C-b", ACTION_GOTO_PAGE_PREVIOUS, {}},
{ "C-f", ACTION_GOTO_PAGE_NEXT, {}},
{ "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, {}},
{ "b", ACTION_FIELD_PREVIOUS, {}},
{ "w", ACTION_FIELD_NEXT, {}},
{ "C-y", ACTION_SCROLL_UP, {}},
{ "C-e", ACTION_SCROLL_DOWN, {}},
};
static int
app_binding_cmp (const void *a, const void *b)
{
return termo_keycmp (g_ctx.tk,
&((struct binding *) a)->decoded, &((struct binding *) b)->decoded);
}
static void
app_init_bindings (void)
{
for (size_t i = 0; i < N_ELEMENTS (g_default_bindings); i++)
{
struct binding *binding = &g_default_bindings[i];
hard_assert (!*termo_strpkey_utf8 (g_ctx.tk,
binding->key, &binding->decoded, TERMO_FORMAT_ALTISMETA));
}
qsort (g_default_bindings, N_ELEMENTS (g_default_bindings),
sizeof *g_default_bindings, app_binding_cmp);
}
static bool
app_process_termo_event (termo_key_t *event)
{
struct binding dummy = { NULL, 0, *event }, *binding =
bsearch (&dummy, g_default_bindings, N_ELEMENTS (g_default_bindings),
sizeof *g_default_bindings, app_binding_cmp);
if (binding)
return app_process_action (binding->action);
// TODO: once we become an editor, use 0-9 a-f to overwrite nibbles
return false;
}
// --- Signals -----------------------------------------------------------------
static int g_signal_pipe[2]; ///< A pipe used to signal... signals
/// Program termination has been requested by a signal
static volatile sig_atomic_t g_termination_requested;
/// The window has changed in size
static volatile sig_atomic_t g_winch_received;
static void
signals_postpone_handling (char id)
{
int original_errno = errno;
if (write (g_signal_pipe[1], &id, 1) == -1)
soft_assert (errno == EAGAIN);
errno = original_errno;
}
static void
signals_superhandler (int signum)
{
switch (signum)
{
case SIGWINCH:
g_winch_received = true;
signals_postpone_handling ('w');
break;
case SIGINT:
case SIGTERM:
g_termination_requested = true;
signals_postpone_handling ('t');
break;
default:
hard_assert (!"unhandled signal");
}
}
static void
signals_setup_handlers (void)
{
if (pipe (g_signal_pipe) == -1)
exit_fatal ("%s: %s", "pipe", strerror (errno));
set_cloexec (g_signal_pipe[0]);
set_cloexec (g_signal_pipe[1]);
// So that the pipe cannot overflow; it would make write() block within
// the signal handler, which is something we really don't want to happen.
// The same holds true for read().
set_blocking (g_signal_pipe[0], false);
set_blocking (g_signal_pipe[1], false);
signal (SIGPIPE, SIG_IGN);
struct sigaction sa;
sa.sa_flags = SA_RESTART;
sa.sa_handler = signals_superhandler;
sigemptyset (&sa.sa_mask);
if (sigaction (SIGWINCH, &sa, NULL) == -1
|| sigaction (SIGINT, &sa, NULL) == -1
|| sigaction (SIGTERM, &sa, NULL) == -1)
exit_fatal ("sigaction: %s", strerror (errno));
}
// --- Initialisation, event handling ------------------------------------------
static void
app_on_tty_readable (const struct pollfd *fd, void *user_data)
{
(void) user_data;
if (fd->revents & ~(POLLIN | POLLHUP | POLLERR))
print_debug ("fd %d: unexpected revents: %d", fd->fd, fd->revents);
poller_timer_reset (&g_ctx.tk_timer);
termo_advisereadable (g_ctx.tk);
termo_key_t event;
termo_result_t res;
while ((res = termo_getkey (g_ctx.tk, &event)) == TERMO_RES_KEY)
{
int y, x, button;
termo_mouse_event_t type;
bool success;
if (termo_interpret_mouse (g_ctx.tk, &event, &type, &button, &y, &x))
success = app_process_mouse (type, y, x, button);
else
success = app_process_termo_event (&event);
if (!success)
beep ();
}
if (res == TERMO_RES_AGAIN)
poller_timer_set (&g_ctx.tk_timer, termo_get_waittime (g_ctx.tk));
else if (res == TERMO_RES_ERROR || res == TERMO_RES_EOF)
app_quit ();
}
static void
app_on_key_timer (void *user_data)
{
(void) user_data;
termo_key_t event;
if (termo_getkey_force (g_ctx.tk, &event) == TERMO_RES_KEY)
if (!app_process_termo_event (&event))
app_quit ();
}
static void
app_on_signal_pipe_readable (const struct pollfd *fd, void *user_data)
{
(void) user_data;
char id = 0;
(void) read (fd->fd, &id, 1);
if (g_termination_requested && !g_ctx.quitting)
app_quit ();
if (g_winch_received)
{
g_winch_received = false;
update_curses_terminal_size ();
app_fix_view_range ();
app_invalidate ();
}
}
static void
app_log_handler (void *user_data, const char *quote, const char *fmt,
va_list ap)
{
// We certainly don't want to end up in a possibly infinite recursion
static bool in_processing;
if (in_processing)
return;
in_processing = true;
struct str message = str_make ();
str_append (&message, quote);
str_append_vprintf (&message, fmt, ap);
// If the standard error output isn't redirected, try our best at showing
// the message to the user
if (!isatty (STDERR_FILENO))
fprintf (stderr, "%s\n", message.str);
else
{
free (g_ctx.message);
g_ctx.message = xstrdup (message.str);
g_ctx.message_attr = (intptr_t) user_data;
app_invalidate ();
}
str_free (&message);
in_processing = false;
}
static void
app_init_poller_events (void)
{
g_ctx.signal_event = poller_fd_make (&g_ctx.poller, g_signal_pipe[0]);
g_ctx.signal_event.dispatcher = app_on_signal_pipe_readable;
poller_fd_set (&g_ctx.signal_event, POLLIN);
g_ctx.tty_event = poller_fd_make (&g_ctx.poller, STDIN_FILENO);
g_ctx.tty_event.dispatcher = app_on_tty_readable;
poller_fd_set (&g_ctx.tty_event, POLLIN);
g_ctx.tk_timer = poller_timer_make (&g_ctx.poller);
g_ctx.tk_timer.dispatcher = app_on_key_timer;
g_ctx.refresh_event = poller_idle_make (&g_ctx.poller);
g_ctx.refresh_event.dispatcher = app_on_refresh;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
/// 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, int64_t *out)
{
char *end;
errno = 0;
int64_t n = strtol (s, &end, 0);
if (errno != 0 || end == s || n < 0)
return false;
int64_t f = 1;
switch (*end)
{
case 'c': f = 1 << 0; end++; break;
case 'w': f = 1 << 1; end++; break;
case 'b': f = 1 << 9; end++; break;
case 'K': f = 1 << 10; if (*++end == 'B') { f = 1e3; end++; } break;
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 > INT64_MAX / f)
return false;
*out = n * f;
return true;
}
int
main (int argc, char *argv[])
{
static const struct opt opts[] =
{
{ 'd', "debug", NULL, 0, "run in debug mode" },
{ 'h', "help", NULL, 0, "display this help and exit" },
{ 'V', "version", NULL, 0, "output version information and exit" },
{ 'o', "offset", "OFFSET", 0, "offset within the file" },
{ 's', "size", "SIZE", 0, "size limit (1G by default)" },
#ifdef HAVE_LUA
{ 't', "type", "TYPE", 0, "force interpretation as the given type" },
#endif // HAVE_LUA
{ 0, NULL, NULL, 0, NULL }
};
struct opt_handler oh =
opt_handler_make (argc, argv, opts, "[FILE]", "Hex viewer.");
int64_t size_limit = 1 << 30;
const char *forced_type = NULL;
int c;
while ((c = opt_handler_get (&oh)) != -1)
switch (c)
{
case 'd':
g_debug_mode = true;
break;
case 'h':
opt_handler_usage (&oh, stdout);
exit (EXIT_SUCCESS);
case 'V':
printf (PROGRAM_NAME " " PROGRAM_VERSION "\n");
exit (EXIT_SUCCESS);
case 'o':
if (!decode_size (optarg, &g_ctx.data_offset))
exit_fatal ("invalid offset specified");
break;
case 's':
if (!decode_size (optarg, &size_limit))
exit_fatal ("invalid size limit specified");
break;
case 't':
forced_type = optarg;
break;
default:
print_error ("wrong options");
opt_handler_usage (&oh, stderr);
exit (EXIT_FAILURE);
}
argc -= optind;
argv += optind;
#ifdef HAVE_LUA
// We do it at this questionable location to catch plugin failure before
// we read potentially hundreds of megabytes of data in
app_lua_init ();
if (forced_type && !strcmp (forced_type, "list"))
{
struct str_map_iter iter = str_map_iter_make (&g_ctx.coders);
while (str_map_iter_next (&iter))
puts (iter.link->key);
exit (EXIT_SUCCESS);
}
#endif // HAVE_LUA
// When no filename is given, read from stdin and replace it with the tty
int input_fd;
if (argc == 0)
{
if ((input_fd = dup (STDIN_FILENO)) < 0)
exit_fatal ("cannot read input: %s", strerror (errno));
close (STDIN_FILENO);
if (open ("/dev/tty", O_RDWR) != STDIN_FILENO)
exit_fatal ("cannot open the terminal: %s", strerror (errno));
}
else if (argc == 1)
{
g_ctx.filename = xstrdup (argv[0]);
if ((input_fd = open (argv[0], O_RDONLY)) < 0)
exit_fatal ("cannot open `%s': %s", argv[0], strerror (errno));
}
else
{
opt_handler_usage (&oh, stderr);
exit (EXIT_FAILURE);
}
opt_handler_free (&oh);
// Seek in the file or pipe however we can
static char seek_buf[8192];
if (lseek (input_fd, g_ctx.data_offset, SEEK_SET) == (off_t) -1)
for (uint64_t remaining = g_ctx.data_offset; remaining; )
{
ssize_t n_read = read (input_fd,
seek_buf, MIN (remaining, sizeof seek_buf));
if (n_read <= 0)
exit_fatal ("cannot seek: %s", strerror (errno));
remaining -= n_read;
}
// Read up to "size_limit" bytes of data into a buffer
struct str buf = str_make ();
while (buf.len < (size_t) size_limit)
{
str_reserve (&buf, 8192);
ssize_t n_read = read (input_fd, buf.str + buf.len,
MIN (size_limit - buf.len, buf.alloc - buf.len));
if (!n_read)
break;
if (n_read == -1)
exit_fatal ("cannot read input: %s", strerror (errno));
buf.len += n_read;
}
g_ctx.data = (uint8_t *) buf.str;
g_ctx.data_len = buf.len;
g_ctx.view_top = g_ctx.data_offset / ROW_SIZE * ROW_SIZE;
g_ctx.view_cursor = g_ctx.data_offset;
// We only need to convert to and from the terminal encoding
if (!setlocale (LC_CTYPE, ""))
print_warning ("failed to set the locale");
app_init_context ();
#ifdef HAVE_LUA
// TODO: eventually we should do this in a separate thread after load
// as it may take a long time (-> responsivity) and once we allow the user
// to edit the file, each change will need a background rescan
lua_pushcfunction (g_ctx.L, app_lua_error_handler);
lua_pushcfunction (g_ctx.L, app_lua_chunk_decode);
struct app_lua_chunk *chunk = app_lua_chunk_new (g_ctx.L);
chunk->offset = g_ctx.data_offset;
chunk->len = g_ctx.data_len;
if (forced_type)
lua_pushstring (g_ctx.L, forced_type);
else
lua_pushnil (g_ctx.L);
if (lua_pcall (g_ctx.L, 2, 0, -4))
exit_fatal ("Lua: decoding failed: %s", lua_tostring (g_ctx.L, -1));
lua_pop (g_ctx.L, 1);
#endif // HAVE_LUA
app_flatten_marks ();
app_load_configuration ();
app_init_terminal ();
signals_setup_handlers ();
app_init_poller_events ();
app_invalidate ();
app_init_bindings ();
// Redirect all messages from liberty so that they don't disrupt display
g_log_message_real = app_log_handler;
g_ctx.polling = true;
while (g_ctx.polling)
poller_run (&g_ctx.poller);
endwin ();
g_log_message_real = log_message_stdio;
app_free_context ();
#ifdef HAVE_LUA
str_map_free (&g_ctx.coders);
lua_close (g_ctx.L);
#endif // HAVE_LUA
return 0;
}
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