sortix-mirror/kblayout-compiler/kblayout-compiler.c

771 lines
20 KiB
C

/*
* Copyright (c) 2014, 2016 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* 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.
*
* kblayout-compiler.c
* Keyboard layout compiler.
*/
#include <assert.h>
#include <endian.h>
#include <err.h>
#include <errno.h>
#include <locale.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include "kblayout.h"
#define DEFAULT_COMPRESSION "none"
#define DEFAULT_FORMAT "sortix-kblayout-1"
#define ARRAY_SIZE(x) (sizeof((x)) / sizeof((x)[0]))
bool accept_any(uint32_t combination)
{
(void) combination;
return true;
}
bool accept_no_shift(uint32_t combination)
{
if ( combination & 0b0001 )
return false;
return true;
}
bool accept_no_altgr(uint32_t combination)
{
if ( combination & 0b0100 )
return false;
return true;
}
bool accept_altgr(uint32_t combination)
{
if ( !(combination & 0b0100) )
return false;
return true;
}
bool accept_no_shift_no_alt_gr(uint32_t combination)
{
if ( combination & 0b0101 )
return false;
return true;
}
bool accept_shift_no_alt_gr(uint32_t combination)
{
if ( combination & 0b0100 )
return false;
if ( !(combination & 0b0001) )
return false;
return true;
}
bool accept_no_shift_alt_gr(uint32_t combination)
{
if ( combination & 0b0001 )
return false;
if ( !(combination & 0b0100) )
return false;
return true;
}
bool accept_no_shift_alt_gr_no_caps(uint32_t combination)
{
if ( (combination & 0b0010) )
return false;
if ( combination & 0b0001 )
return false;
if ( !(combination & 0b0100) )
return false;
return true;
}
bool accept_no_shift_alt_gr_caps(uint32_t combination)
{
if ( !(combination & 0b0010) )
return false;
if ( combination & 0b0001 )
return false;
if ( !(combination & 0b0100) )
return false;
return true;
}
bool accept_shift_alt_gr(uint32_t combination)
{
if ( !(combination & 0b0001) )
return false;
if ( !(combination & 0b0100) )
return false;
return true;
}
bool accept_lower_no_altgr(uint32_t combination)
{
if ( (combination & 0b0100) )
return false;
if ( (combination & 0b0001) && !(combination & 0b0010) )
return false;
if ( !(combination & 0b0001) && (combination & 0b0010) )
return false;
return true;
}
bool accept_upper_no_altgr(uint32_t combination)
{
if ( (combination & 0b0100) )
return false;
if ( (combination & 0b0001) && (combination & 0b0010) )
return false;
if ( !(combination & 0b0001) && !(combination & 0b0010) )
return false;
return true;
}
bool accept_lower_altgr(uint32_t combination)
{
if ( !(combination & 0b0100) )
return false;
if ( (combination & 0b0001) && !(combination & 0b0010) )
return false;
if ( !(combination & 0b0001) && (combination & 0b0010) )
return false;
return true;
}
bool accept_upper_altgr(uint32_t combination)
{
if ( !(combination & 0b0100) )
return false;
if ( (combination & 0b0001) && (combination & 0b0010) )
return false;
if ( !(combination & 0b0001) && !(combination & 0b0010) )
return false;
return true;
}
bool accept_numlock(uint32_t combination)
{
if ( !(combination & 0b1000) )
return false;
return true;
}
struct key
{
const char* name;
uint32_t scancode;
};
struct key keys[] =
{
{ "KESC", 0x01 },
{ "K1", 0x02 },
{ "K2", 0x03 },
{ "K3", 0x04 },
{ "K4", 0x05 },
{ "K5", 0x06 },
{ "K6", 0x07 },
{ "K7", 0x08 },
{ "K8", 0x09 },
{ "K9", 0x0A },
{ "K0", 0x0B },
{ "KSYM1", 0x0C },
{ "KSYM2", 0x0D },
{ "KBKSPC", 0x0E },
{ "KTAB", 0x0F },
{ "KQ", 0x10 },
{ "KW", 0x11 },
{ "KE", 0x12 },
{ "KR", 0x13 },
{ "KT", 0x14 },
{ "KY", 0x15 },
{ "KU", 0x16 },
{ "KI", 0x17 },
{ "KO", 0x18 },
{ "KP", 0x19 },
{ "KSYM3", 0x1A },
{ "KSYM4", 0x1B },
{ "KENTER", 0x1C },
{ "KLCTRL", 0x1D },
{ "KA", 0x1E },
{ "KS", 0x1F },
{ "KD", 0x20 },
{ "KF", 0x21 },
{ "KG", 0x22 },
{ "KH", 0x23 },
{ "KJ", 0x24 },
{ "KK", 0x25 },
{ "KL", 0x26 },
{ "KSYM5", 0x27 },
{ "KSYM6", 0x28 },
{ "KSYM7", 0x29 },
{ "KLSHIFT", 0x2A },
{ "KSYM8", 0x2B },
{ "KZ", 0x2C },
{ "KX", 0x2D },
{ "KC", 0x2E },
{ "KV", 0x2F },
{ "KB", 0x30 },
{ "KN", 0x31 },
{ "KM", 0x32 },
{ "KSYM9", 0x33 },
{ "KSYM10", 0x34 },
{ "KSYM11", 0x35 },
{ "KRSHIFT", 0x36 },
{ "KSYM12", 0x37 },
{ "KLALT", 0x38 },
{ "KSPACE", 0x39 },
{ "KCAPSLOCK", 0x3A },
{ "KF1", 0x3B },
{ "KF2", 0x3C },
{ "KF3", 0x3D },
{ "KF4", 0x3E },
{ "KF5", 0x3F },
{ "KF6", 0x40 },
{ "KF7", 0x41 },
{ "KF8", 0x42 },
{ "KF9", 0x43 },
{ "KF10", 0x44 },
{ "KNUMLOCK", 0x45 },
{ "KSCROLLLOCK", 0x46 },
{ "KPAD7", 0x47 },
{ "KPAD8", 0x48 },
{ "KPAD9", 0x49 },
{ "KSYM13", 0x4A },
{ "KPAD4", 0x4B },
{ "KPAD5", 0x4C },
{ "KPAD6", 0x4D },
{ "KSYM14", 0x4E },
{ "KPAD1", 0x4F },
{ "KPAD2", 0x50 },
{ "KPAD3", 0x51 },
{ "KPAD0", 0x52 },
{ "KSYM15", 0x53 },
{ "KALTSYSRQ", 0x54 },
{ "KNO_STANDARD_MEANING_1", 0x55 /* Sometimes F11, F12, or even FN */ },
{ "KNO_STANDARD_MEANING_2", 0x56 /* Possibly Windows key? */ },
{ "KF11", 0x57 },
{ "KF12", 0x58 },
/* [0x59,", 0x7F] are not really standard. */
{ "KPADENTER", (0x80 + 0x1C) },
{ "KRCTRL", (0x80 + 0x1D) },
{ "KFAKELSHIFT", (0x80 + 0x2A) },
{ "KSYM16", (0x80 + 0x35) },
{ "KFAKERSHIFT", (0x80 + 0x36) },
{ "KCTRLPRINTSCRN", (0x80 + 0x37) },
{ "KRALT", (0x80 + 0x38) },
{ "KCTRLBREAK", (0x80 + 0x46) },
{ "KHOME", (0x80 + 0x47) },
{ "KUP", (0x80 + 0x48) },
{ "KPGUP", (0x80 + 0x49) },
{ "KLEFT", (0x80 + 0x4B) },
{ "KRIGHT", (0x80 + 0x4D) },
{ "KEND", (0x80 + 0x4F) },
{ "KDOWN", (0x80 + 0x50) },
{ "KPGDOWN", (0x80 + 0x51) },
{ "KINSERT", (0x80 + 0x52) },
{ "KDELETE", (0x80 + 0x53) },
{ "KLSUPER", (0x80 + 0x5B) },
{ "KRSUPER", (0x80 + 0x5C) },
{ "KMENU", (0x80 + 0x5D) },
};
struct modifier
{
char* name;
};
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
bool get_option_variable(const char* option, char** varptr,
const char* arg, int argc, char** argv, int* ip,
const char* argv0)
{
size_t option_len = strlen(option);
if ( strncmp(option, arg, option_len) != 0 )
return false;
if ( arg[option_len] == '=' )
{
*varptr = strdup(arg + option_len + 1);
return true;
}
if ( arg[option_len] != '\0' )
return false;
if ( *ip + 1 == argc )
{
fprintf(stderr, "%s: expected operand after `%s'\n", argv0, option);
exit(1);
}
*varptr = strdup(argv[++*ip]), argv[*ip] = NULL;
return true;
}
#define GET_OPTION_VARIABLE(str, varptr) \
get_option_variable(str, varptr, arg, argc, argv, &i, argv0)
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]... INPUT -o OUTPUT\n", argv0);
fprintf(fp, "Compile a keyboard layout description to a binary representation.\n");
fprintf(fp, "\n");
fprintf(fp, "Mandatory arguments to long options are mandatory for short options too.\n");
fprintf(fp, " --compression=FORMAT compression algorithm [%s]\n", DEFAULT_COMPRESSION);
fprintf(fp, " --format=FORMAT format version [%s]\n", DEFAULT_FORMAT);
fprintf(fp, " -o, --output=FILE write result to FILE\n");
fprintf(fp, " --help display this help and exit\n");
fprintf(fp, " --version output version information and exit\n");
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
}
static
void compress_actions_none(FILE* fp,
struct kblayout_action* actions,
size_t actions_length)
{
fwrite(actions, sizeof(struct kblayout_action), actions_length, fp);
}
static
void compress_actions_runlength_bevlq(FILE* fp,
struct kblayout_action* actions,
size_t actions_length)
{
for ( size_t i = 0; i < actions_length; )
{
uint8_t j;
j = 0;
while ( i + 1 + j < actions_length && j < 127 &&
actions[i+1+j].type == actions[i].type &&
actions[i+1+j].codepoint == actions[i].codepoint )
j++;
uint8_t to_write = 0;
uint8_t extra_written = 0;
if ( 0 < j )
{
to_write = 1;
fputc(0x00 | j, fp);
extra_written = j;
}
else
{
j = 0;
while ( i + 1 + j < actions_length && j < 127 &&
!(actions[i+1+j].type == actions[i+j].type &&
actions[i+1+j].codepoint == actions[i+j].codepoint) )
j++;
fputc(0x80 | j, fp);
to_write = j;
extra_written = 0;
}
for ( size_t n = 0; n < to_write; n++ )
{
fputc(actions[i+n].type & 0xFF, fp);
if ( actions[i+n].codepoint < 1 << 7 )
fputc(0x00 | (actions[i+n].codepoint >> 0*7 & 0x7F), fp);
else if ( actions[i+n].codepoint < 1 << 2 * 7 )
fputc(0x80 | (actions[i+n].codepoint >> 1*7 & 0x7F), fp),
fputc(0x00 | (actions[i+n].codepoint >> 0*7 & 0x7F), fp);
else if ( actions[i+n].codepoint < 1 << 3 * 7 )
fputc(0x80 | (actions[i+n].codepoint >> 2*7 & 0x7F), fp),
fputc(0x80 | (actions[i+n].codepoint >> 1*7 & 0x7F), fp),
fputc(0x00 | (actions[i+n].codepoint >> 0*7 & 0x7F), fp);
else if ( actions[i+n].codepoint < 1 << 4 * 7 )
fputc(0x80 | (actions[i+n].codepoint >> 3*7 & 0x7F), fp),
fputc(0x80 | (actions[i+n].codepoint >> 2*7 & 0x7F), fp),
fputc(0x80 | (actions[i+n].codepoint >> 1*7 & 0x7F), fp),
fputc(0x00 | (actions[i+n].codepoint >> 0*7 & 0x7F), fp);
else
fputc(0x80 | (actions[i+n].codepoint >> 4*7 & 0x7F), fp),
fputc(0x80 | (actions[i+n].codepoint >> 3*7 & 0x7F), fp),
fputc(0x80 | (actions[i+n].codepoint >> 2*7 & 0x7F), fp),
fputc(0x80 | (actions[i+n].codepoint >> 1*7 & 0x7F), fp),
fputc(0x00 | (actions[i+n].codepoint >> 0*7 & 0x7F), fp);
}
i += to_write + extra_written;
}
}
int main(int argc, char* argv[])
{
setlocale(LC_ALL, "");
bool verbose = false;
char* arg_compression = strdup(DEFAULT_COMPRESSION);
char* arg_format = strdup(DEFAULT_FORMAT);
char* arg_output = NULL;
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
char c;
while ( (c = *++arg) ) switch ( c )
{
case 'o':
free(arg_output);
if ( *(arg+1) )
arg_output = strdup(arg + 1);
else
{
if ( i + 1 == argc )
{
warnx("option requires an argument -- 'o'");
fprintf(stderr, "Try `%s --help' for more information.\n", argv[0]);
exit(125);
}
arg_output = strdup(argv[i+1]);
argv[++i] = NULL;
}
arg = "o";
break;
case 'v': verbose = true; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--verbose") )
verbose = true;
else if ( GET_OPTION_VARIABLE("--compression", &arg_compression) ) { }
else if ( GET_OPTION_VARIABLE("--format", &arg_format) ) { }
else if ( GET_OPTION_VARIABLE("--output", &arg_output) ) { }
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
if ( argc == 1 )
{
help(stdout, argv0);
exit(1);
}
compact_arguments(&argc, &argv);
const char* compression = arg_compression;
const char* format = arg_format;
const char* output_path = arg_output;
if ( argc == 1 )
{
fprintf(stderr, "%s: No input file was specified\n", argv0);
fprintf(stderr, "Try `%s --help' for more information.\n", argv0);
exit(1);
}
const char* input_path = argv[1];
char* name = NULL;
size_t num_scancodes = 0;
struct modifier modifiers[KBLAYOUT_MAX_NUM_MODIFIERS];
size_t num_modifiers = 0;
bool (*condition)(uint32_t) = accept_any;
struct kblayout_action* actions = NULL;
FILE* input = fopen(input_path, "r");
char* line = NULL;
size_t line_size = 0;
ssize_t line_length;
while ( 0 < (line_length = getline(&line, &line_size, input)) )
{
if ( line[line_length-1] == '\n' )
line[--line_length] = '\0';
if ( line[0] == '/' && line[1] == '/' )
continue;
if ( !line[0] )
continue;
if ( strncmp(line, "name \"", strlen("name \"")) == 0 )
{
name = strdup(line + strlen("name \""));
if ( strlen(name) && name[strlen(name)-1] == '\"' )
name[strlen(name)-1] = '\0';
continue;
}
if ( strncmp(line, "modifier ", strlen("modifier ")) == 0 )
{
modifiers[num_modifiers++].name = strdup(line + strlen("modifier "));
continue;
}
if ( line[line_length-1] == ':' )
{
line[--line_length] = '\0';
if ( !strcmp(line, "-shift") )
condition = accept_no_shift;
else if ( !strcmp(line, "-altgr") )
condition = accept_no_altgr;
else if ( !strcmp(line, "+altgr") )
condition = accept_altgr;
else if ( !strcmp(line, "-shift & -altgr") )
condition = accept_no_shift_no_alt_gr;
else if ( !strcmp(line, "+shift & -altgr") )
condition = accept_shift_no_alt_gr;
else if ( !strcmp(line, "-shift & +altgr") )
condition = accept_no_shift_alt_gr;
else if ( !strcmp(line, "-shift & +altgr & -caps") )
condition = accept_no_shift_alt_gr_no_caps;
else if ( !strcmp(line, "-shift & +altgr & +caps") )
condition = accept_no_shift_alt_gr_caps;
else if ( !strcmp(line, "+shift & +altgr") )
condition = accept_shift_alt_gr;
else if ( !strcmp(line, "shift = caps & -altgr") )
condition = accept_lower_no_altgr;
else if ( !strcmp(line, "shift ^ caps & -altgr") )
condition = accept_upper_no_altgr;
else if ( !strcmp(line, "shift = caps & +altgr") )
condition = accept_lower_altgr;
else if ( !strcmp(line, "shift ^ caps & +altgr") )
condition = accept_upper_altgr;
else if ( !strcmp(line, "+numlock") )
condition = accept_numlock;
else
fprintf(stderr, "Unsupported modifier combination: %s\n", line);
continue;
}
const char* statement = line;
if ( statement[0] == '\t' )
statement++;
else
condition = accept_any;
bool found_key = false;
for ( size_t i = 0; i < ARRAY_SIZE(keys); i++ )
{
if ( strncmp(statement, keys[i].name, strlen(keys[i].name)) != 0 )
continue;
if ( statement[strlen(keys[i].name)+0] != ':' )
continue;
if ( statement[strlen(keys[i].name)+1] != ' ' )
continue;
found_key = true;
if ( num_scancodes <= keys[i].scancode )
{
size_t old_action_length = num_scancodes * (1 << num_modifiers);
size_t old_action_size = sizeof(struct kblayout_action) * old_action_length;
num_scancodes = keys[i].scancode + 1;
size_t new_action_length = num_scancodes * (1 << num_modifiers);
size_t new_action_size = sizeof(struct kblayout_action) * new_action_length;
actions = (struct kblayout_action*) realloc(actions, new_action_size);
memset((uint8_t*) actions + old_action_size, 0, new_action_size - old_action_size);
}
for ( size_t j = 0; j < 1U << num_modifiers; j++ )
{
if ( !condition(j) )
continue;
assert(keys[i].scancode < num_scancodes);
struct kblayout_action* action = &actions[keys[i].scancode * (1 << num_modifiers) + j];
const char* expr = statement + strlen(keys[i].name) + 2;
if ( strncmp(expr, "dead ", strlen("dead ")) == 0 )
{
const char* which = expr + strlen("dead ");
wchar_t wc;
mbstate_t ps;
memset(&ps, 0, sizeof(ps));
size_t count = mbrtowc(&wc, which, strlen(which), &ps);
assert(0 < count);
action->type = htole32(KBLAYOUT_ACTION_TYPE_DEAD);
action->codepoint = htole32((uint32_t) wc);
}
else if ( strncmp(expr, "modify ", strlen("modify ")) == 0 )
{
const char* which = expr + strlen("modify ");
for ( size_t n = 0; n < num_modifiers; n++ )
{
if ( strcmp(modifiers[n].name, which) != 0 )
continue;
action->type = htole32(KBLAYOUT_ACTION_TYPE_MODIFY);
action->codepoint = htole32((uint32_t) n);
break;
}
}
else if ( strncmp(expr, "toggle ", strlen("toggle ")) == 0 )
{
const char* which = expr + strlen("toggle ");
for ( size_t n = 0; n < num_modifiers; n++ )
{
if ( strcmp(modifiers[n].name, which) != 0 )
continue;
action->type = htole32(KBLAYOUT_ACTION_TYPE_TOGGLE);
action->codepoint = htole32((uint32_t) n);
break;
}
}
else if ( expr[0] == '"' && 2 <= strlen(expr) && expr[strlen(expr)-1] == '"' )
{
wchar_t wc;
mbstate_t ps;
memset(&ps, 0, sizeof(ps));
size_t count = mbrtowc(&wc, expr + 1, strlen(expr) - 2, &ps);
if ( wc == L'\\' )
{
count = mbrtowc(&wc, expr + 1 + count, strlen(expr) - 2 - count, &ps);
switch ( wc )
{
case L'a': wc = L'\a'; break;
case L'b': wc = L'\b'; break;
case L'e': wc = L'\e'; break;
case L'f': wc = L'\f'; break;
case L'n': wc = L'\n'; break;
case L'r': wc = L'\r'; break;
case L't': wc = L'\t'; break;
case L'v': wc = L'\v'; break;
default: break;
}
}
assert(0 < count);
action->type = htole32(KBLAYOUT_ACTION_TYPE_CODEPOINT);
action->codepoint = htole32((uint32_t) wc);
}
}
break;
}
assert(found_key);
}
free(line);
if ( ferror(input) )
err(1, "%s", input_path);
fclose(input);
if ( verbose )
{
for ( size_t i = 0; i < num_scancodes; i++ )
{
struct kblayout_action* row = &actions[i * (1 << num_modifiers)];
bool any_actions = false;
for ( size_t j = 0; !any_actions && j < 1U << num_modifiers; j++ )
if ( row[j].type || row[j].codepoint )
any_actions = true;
if ( !any_actions )
continue;
struct key* key = NULL;
for ( size_t j = 0; !key && j < ARRAY_SIZE(keys); j++ )
if ( keys[j].scancode == i )
key = &keys[j];
assert(key);
printf("%-16s", key->name);
for ( size_t j = 0; j < 1U << num_modifiers; j++ )
{
if ( row[j].type == 0 && row[j].codepoint )
printf("%lc\t", row[j].codepoint);
else if ( row[j].type == 1 && row[j].codepoint )
printf("d%lc\t", row[j].codepoint);
else if ( row[j].type == 2 && row[j].codepoint )
printf("m%u\t", row[j].codepoint);
else
printf("-\t");
}
printf("\n");
}
}
if ( !strcmp(compression, "default") )
compression = DEFAULT_COMPRESSION;
if ( !strcmp(format, "default") )
format = DEFAULT_FORMAT;
if ( strcmp(compression, "none") != 0 &&
strcmp(compression, "runlength-bevlq") != 0 )
{
fprintf(stderr, "%s: Unsupported compression `%s'\n", argv0, compression);
fprintf(stderr, "Try `%s --help' for more information.\n", argv0);
exit(1);
}
if ( strcmp(format, "sortix-kblayout-1") != 0 )
{
fprintf(stderr, "%s: Unsupported format `%s'\n", argv0, format);
fprintf(stderr, "Try `%s --help' for more information.\n", argv0);
exit(1);
}
if ( !output_path )
{
fprintf(stderr, "%s: No output file was specified\n", argv0);
fprintf(stderr, "Try `%s --help' for more information.\n", argv0);
exit(1);
}
FILE* output = fopen(output_path, "w");
if ( !output )
err(1, "%s", output_path);
uint32_t compression_algorithm;
void (*compressor)(FILE*, struct kblayout_action*, size_t);
if ( !strcmp(compression, "runlength-bevlq") )
compression_algorithm = KBLAYOUT_COMPRESSION_RUNLENGTH_BEVLQ,
compressor = compress_actions_runlength_bevlq;
else
compression_algorithm = KBLAYOUT_COMPRESSION_NONE,
compressor = compress_actions_none;
struct kblayout header;
memset(&header, 0, sizeof(header));
strncpy(header.magic, format, sizeof(header.magic));
strncpy(header.name, name ? name : "", sizeof(header.name));
header.num_modifiers = htole32((uint32_t) num_modifiers);
header.num_scancodes = htole32((uint32_t) num_scancodes);
header.compression_algorithm = htole32((uint32_t) compression_algorithm);
fwrite(&header, 1, sizeof(header), output);
size_t actions_length = num_scancodes * (1 << num_modifiers);
compressor(output, actions, actions_length);
fclose(output);
return 0;
}