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gecko-dev/modules/brotli/tools/brotli.c

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C
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/* Copyright 2014 Google Inc. All Rights Reserved.
Distributed under MIT license.
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
*/
/* Command line interface for Brotli library. */
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include "../common/constants.h"
#include "../common/version.h"
#include <brotli/decode.h>
#include <brotli/encode.h>
#if !defined(_WIN32)
#include <unistd.h>
#include <utime.h>
#define MAKE_BINARY(FILENO) (FILENO)
#else
#include <io.h>
#include <share.h>
#include <sys/utime.h>
#define MAKE_BINARY(FILENO) (_setmode((FILENO), _O_BINARY), (FILENO))
#if !defined(__MINGW32__)
#define STDIN_FILENO _fileno(stdin)
#define STDOUT_FILENO _fileno(stdout)
#define S_IRUSR S_IREAD
#define S_IWUSR S_IWRITE
#endif
#define fdopen _fdopen
#define isatty _isatty
#define unlink _unlink
#define utimbuf _utimbuf
#define utime _utime
#define fopen ms_fopen
#define open ms_open
#define chmod(F, P) (0)
#define chown(F, O, G) (0)
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
#define fseek _fseeki64
#define ftell _ftelli64
#endif
static FILE* ms_fopen(const char* filename, const char* mode) {
FILE* result = 0;
fopen_s(&result, filename, mode);
return result;
}
static int ms_open(const char* filename, int oflag, int pmode) {
int result = -1;
_sopen_s(&result, filename, oflag | O_BINARY, _SH_DENYNO, pmode);
return result;
}
#endif /* WIN32 */
typedef enum {
COMMAND_COMPRESS,
COMMAND_DECOMPRESS,
COMMAND_HELP,
COMMAND_INVALID,
COMMAND_TEST_INTEGRITY,
COMMAND_NOOP,
COMMAND_VERSION
} Command;
#define DEFAULT_LGWIN 24
#define DEFAULT_SUFFIX ".br"
#define MAX_OPTIONS 20
typedef struct {
/* Parameters */
int quality;
int lgwin;
BROTLI_BOOL force_overwrite;
BROTLI_BOOL junk_source;
BROTLI_BOOL copy_stat;
BROTLI_BOOL verbose;
BROTLI_BOOL write_to_stdout;
BROTLI_BOOL test_integrity;
BROTLI_BOOL decompress;
BROTLI_BOOL large_window;
const char* output_path;
const char* suffix;
int not_input_indices[MAX_OPTIONS];
size_t longest_path_len;
size_t input_count;
/* Inner state */
int argc;
char** argv;
char* modified_path; /* Storage for path with appended / cut suffix */
int iterator;
int ignore;
BROTLI_BOOL iterator_error;
uint8_t* buffer;
uint8_t* input;
uint8_t* output;
const char* current_input_path;
const char* current_output_path;
int64_t input_file_length; /* -1, if impossible to calculate */
FILE* fin;
FILE* fout;
/* I/O buffers */
size_t available_in;
const uint8_t* next_in;
size_t available_out;
uint8_t* next_out;
} Context;
/* Parse up to 5 decimal digits. */
static BROTLI_BOOL ParseInt(const char* s, int low, int high, int* result) {
int value = 0;
int i;
for (i = 0; i < 5; ++i) {
char c = s[i];
if (c == 0) break;
if (s[i] < '0' || s[i] > '9') return BROTLI_FALSE;
value = (10 * value) + (c - '0');
}
if (i == 0) return BROTLI_FALSE;
if (i > 1 && s[0] == '0') return BROTLI_FALSE;
if (s[i] != 0) return BROTLI_FALSE;
if (value < low || value > high) return BROTLI_FALSE;
*result = value;
return BROTLI_TRUE;
}
/* Returns "base file name" or its tail, if it contains '/' or '\'. */
static const char* FileName(const char* path) {
const char* separator_position = strrchr(path, '/');
if (separator_position) path = separator_position + 1;
separator_position = strrchr(path, '\\');
if (separator_position) path = separator_position + 1;
return path;
}
/* Detect if the program name is a special alias that infers a command type. */
static Command ParseAlias(const char* name) {
/* TODO: cast name to lower case? */
const char* unbrotli = "unbrotli";
size_t unbrotli_len = strlen(unbrotli);
name = FileName(name);
/* Partial comparison. On Windows there could be ".exe" suffix. */
if (strncmp(name, unbrotli, unbrotli_len) == 0) {
char terminator = name[unbrotli_len];
if (terminator == 0 || terminator == '.') return COMMAND_DECOMPRESS;
}
return COMMAND_COMPRESS;
}
static Command ParseParams(Context* params) {
int argc = params->argc;
char** argv = params->argv;
int i;
int next_option_index = 0;
size_t input_count = 0;
size_t longest_path_len = 1;
BROTLI_BOOL command_set = BROTLI_FALSE;
BROTLI_BOOL quality_set = BROTLI_FALSE;
BROTLI_BOOL output_set = BROTLI_FALSE;
BROTLI_BOOL keep_set = BROTLI_FALSE;
BROTLI_BOOL lgwin_set = BROTLI_FALSE;
BROTLI_BOOL suffix_set = BROTLI_FALSE;
BROTLI_BOOL after_dash_dash = BROTLI_FALSE;
Command command = ParseAlias(argv[0]);
for (i = 1; i < argc; ++i) {
const char* arg = argv[i];
/* C99 5.1.2.2.1: "members argv[0] through argv[argc-1] inclusive shall
contain pointers to strings"; NULL and 0-length are not forbidden. */
size_t arg_len = arg ? strlen(arg) : 0;
if (arg_len == 0) {
params->not_input_indices[next_option_index++] = i;
continue;
}
/* Too many options. The expected longest option list is:
"-q 0 -w 10 -o f -D d -S b -d -f -k -n -v --", i.e. 16 items in total.
This check is an additional guard that is never triggered, but provides
a guard for future changes. */
if (next_option_index > (MAX_OPTIONS - 2)) {
fprintf(stderr, "too many options passed\n");
return COMMAND_INVALID;
}
/* Input file entry. */
if (after_dash_dash || arg[0] != '-' || arg_len == 1) {
input_count++;
if (longest_path_len < arg_len) longest_path_len = arg_len;
continue;
}
/* Not a file entry. */
params->not_input_indices[next_option_index++] = i;
/* '--' entry stop parsing arguments. */
if (arg_len == 2 && arg[1] == '-') {
after_dash_dash = BROTLI_TRUE;
continue;
}
/* Simple / coalesced options. */
if (arg[1] != '-') {
size_t j;
for (j = 1; j < arg_len; ++j) {
char c = arg[j];
if (c >= '0' && c <= '9') {
if (quality_set) {
fprintf(stderr, "quality already set\n");
return COMMAND_INVALID;
}
quality_set = BROTLI_TRUE;
params->quality = c - '0';
continue;
} else if (c == 'c') {
if (output_set) {
fprintf(stderr, "write to standard output already set\n");
return COMMAND_INVALID;
}
output_set = BROTLI_TRUE;
params->write_to_stdout = BROTLI_TRUE;
continue;
} else if (c == 'd') {
if (command_set) {
fprintf(stderr, "command already set when parsing -d\n");
return COMMAND_INVALID;
}
command_set = BROTLI_TRUE;
command = COMMAND_DECOMPRESS;
continue;
} else if (c == 'f') {
if (params->force_overwrite) {
fprintf(stderr, "force output overwrite already set\n");
return COMMAND_INVALID;
}
params->force_overwrite = BROTLI_TRUE;
continue;
} else if (c == 'h') {
/* Don't parse further. */
return COMMAND_HELP;
} else if (c == 'j' || c == 'k') {
if (keep_set) {
fprintf(stderr, "argument --rm / -j or --keep / -n already set\n");
return COMMAND_INVALID;
}
keep_set = BROTLI_TRUE;
params->junk_source = TO_BROTLI_BOOL(c == 'j');
continue;
} else if (c == 'n') {
if (!params->copy_stat) {
fprintf(stderr, "argument --no-copy-stat / -n already set\n");
return COMMAND_INVALID;
}
params->copy_stat = BROTLI_FALSE;
continue;
} else if (c == 't') {
if (command_set) {
fprintf(stderr, "command already set when parsing -t\n");
return COMMAND_INVALID;
}
command_set = BROTLI_TRUE;
command = COMMAND_TEST_INTEGRITY;
continue;
} else if (c == 'v') {
if (params->verbose) {
fprintf(stderr, "argument --verbose / -v already set\n");
return COMMAND_INVALID;
}
params->verbose = BROTLI_TRUE;
continue;
} else if (c == 'V') {
/* Don't parse further. */
return COMMAND_VERSION;
} else if (c == 'Z') {
if (quality_set) {
fprintf(stderr, "quality already set\n");
return COMMAND_INVALID;
}
quality_set = BROTLI_TRUE;
params->quality = 11;
continue;
}
/* o/q/w/D/S with parameter is expected */
if (c != 'o' && c != 'q' && c != 'w' && c != 'D' && c != 'S') {
fprintf(stderr, "invalid argument -%c\n", c);
return COMMAND_INVALID;
}
if (j + 1 != arg_len) {
fprintf(stderr, "expected parameter for argument -%c\n", c);
return COMMAND_INVALID;
}
i++;
if (i == argc || !argv[i] || argv[i][0] == 0) {
fprintf(stderr, "expected parameter for argument -%c\n", c);
return COMMAND_INVALID;
}
params->not_input_indices[next_option_index++] = i;
if (c == 'o') {
if (output_set) {
fprintf(stderr, "write to standard output already set (-o)\n");
return COMMAND_INVALID;
}
params->output_path = argv[i];
} else if (c == 'q') {
if (quality_set) {
fprintf(stderr, "quality already set\n");
return COMMAND_INVALID;
}
quality_set = ParseInt(argv[i], BROTLI_MIN_QUALITY,
BROTLI_MAX_QUALITY, &params->quality);
if (!quality_set) {
fprintf(stderr, "error parsing quality value [%s]\n", argv[i]);
return COMMAND_INVALID;
}
} else if (c == 'w') {
if (lgwin_set) {
fprintf(stderr, "lgwin parameter already set\n");
return COMMAND_INVALID;
}
lgwin_set = ParseInt(argv[i], 0,
BROTLI_MAX_WINDOW_BITS, &params->lgwin);
if (!lgwin_set) {
fprintf(stderr, "error parsing lgwin value [%s]\n", argv[i]);
return COMMAND_INVALID;
}
if (params->lgwin != 0 && params->lgwin < BROTLI_MIN_WINDOW_BITS) {
fprintf(stderr,
"lgwin parameter (%d) smaller than the minimum (%d)\n",
params->lgwin, BROTLI_MIN_WINDOW_BITS);
return COMMAND_INVALID;
}
} else if (c == 'S') {
if (suffix_set) {
fprintf(stderr, "suffix already set\n");
return COMMAND_INVALID;
}
suffix_set = BROTLI_TRUE;
params->suffix = argv[i];
}
}
} else { /* Double-dash. */
arg = &arg[2];
if (strcmp("best", arg) == 0) {
if (quality_set) {
fprintf(stderr, "quality already set\n");
return COMMAND_INVALID;
}
quality_set = BROTLI_TRUE;
params->quality = 11;
} else if (strcmp("decompress", arg) == 0) {
if (command_set) {
fprintf(stderr, "command already set when parsing --decompress\n");
return COMMAND_INVALID;
}
command_set = BROTLI_TRUE;
command = COMMAND_DECOMPRESS;
} else if (strcmp("force", arg) == 0) {
if (params->force_overwrite) {
fprintf(stderr, "force output overwrite already set\n");
return COMMAND_INVALID;
}
params->force_overwrite = BROTLI_TRUE;
} else if (strcmp("help", arg) == 0) {
/* Don't parse further. */
return COMMAND_HELP;
} else if (strcmp("keep", arg) == 0) {
if (keep_set) {
fprintf(stderr, "argument --rm / -j or --keep / -n already set\n");
return COMMAND_INVALID;
}
keep_set = BROTLI_TRUE;
params->junk_source = BROTLI_FALSE;
} else if (strcmp("no-copy-stat", arg) == 0) {
if (!params->copy_stat) {
fprintf(stderr, "argument --no-copy-stat / -n already set\n");
return COMMAND_INVALID;
}
params->copy_stat = BROTLI_FALSE;
} else if (strcmp("rm", arg) == 0) {
if (keep_set) {
fprintf(stderr, "argument --rm / -j or --keep / -n already set\n");
return COMMAND_INVALID;
}
keep_set = BROTLI_TRUE;
params->junk_source = BROTLI_TRUE;
} else if (strcmp("stdout", arg) == 0) {
if (output_set) {
fprintf(stderr, "write to standard output already set\n");
return COMMAND_INVALID;
}
output_set = BROTLI_TRUE;
params->write_to_stdout = BROTLI_TRUE;
} else if (strcmp("test", arg) == 0) {
if (command_set) {
fprintf(stderr, "command already set when parsing --test\n");
return COMMAND_INVALID;
}
command_set = BROTLI_TRUE;
command = COMMAND_TEST_INTEGRITY;
} else if (strcmp("verbose", arg) == 0) {
if (params->verbose) {
fprintf(stderr, "argument --verbose / -v already set\n");
return COMMAND_INVALID;
}
params->verbose = BROTLI_TRUE;
} else if (strcmp("version", arg) == 0) {
/* Don't parse further. */
return COMMAND_VERSION;
} else {
/* key=value */
const char* value = strrchr(arg, '=');
size_t key_len;
if (!value || value[1] == 0) {
fprintf(stderr, "must pass the parameter as --%s=value\n", arg);
return COMMAND_INVALID;
}
key_len = (size_t)(value - arg);
value++;
if (strncmp("lgwin", arg, key_len) == 0) {
if (lgwin_set) {
fprintf(stderr, "lgwin parameter already set\n");
return COMMAND_INVALID;
}
lgwin_set = ParseInt(value, 0,
BROTLI_MAX_WINDOW_BITS, &params->lgwin);
if (!lgwin_set) {
fprintf(stderr, "error parsing lgwin value [%s]\n", value);
return COMMAND_INVALID;
}
if (params->lgwin != 0 && params->lgwin < BROTLI_MIN_WINDOW_BITS) {
fprintf(stderr,
"lgwin parameter (%d) smaller than the minimum (%d)\n",
params->lgwin, BROTLI_MIN_WINDOW_BITS);
return COMMAND_INVALID;
}
} else if (strncmp("large_window", arg, key_len) == 0) {
/* This option is intentionally not mentioned in help. */
if (lgwin_set) {
fprintf(stderr, "lgwin parameter already set\n");
return COMMAND_INVALID;
}
lgwin_set = ParseInt(value, 0,
BROTLI_LARGE_MAX_WINDOW_BITS, &params->lgwin);
if (!lgwin_set) {
fprintf(stderr, "error parsing lgwin value [%s]\n", value);
return COMMAND_INVALID;
}
if (params->lgwin != 0 && params->lgwin < BROTLI_MIN_WINDOW_BITS) {
fprintf(stderr,
"lgwin parameter (%d) smaller than the minimum (%d)\n",
params->lgwin, BROTLI_MIN_WINDOW_BITS);
return COMMAND_INVALID;
}
} else if (strncmp("output", arg, key_len) == 0) {
if (output_set) {
fprintf(stderr,
"write to standard output already set (--output)\n");
return COMMAND_INVALID;
}
params->output_path = value;
} else if (strncmp("quality", arg, key_len) == 0) {
if (quality_set) {
fprintf(stderr, "quality already set\n");
return COMMAND_INVALID;
}
quality_set = ParseInt(value, BROTLI_MIN_QUALITY,
BROTLI_MAX_QUALITY, &params->quality);
if (!quality_set) {
fprintf(stderr, "error parsing quality value [%s]\n", value);
return COMMAND_INVALID;
}
} else if (strncmp("suffix", arg, key_len) == 0) {
if (suffix_set) {
fprintf(stderr, "suffix already set\n");
return COMMAND_INVALID;
}
suffix_set = BROTLI_TRUE;
params->suffix = value;
} else {
fprintf(stderr, "invalid parameter: [%s]\n", arg);
return COMMAND_INVALID;
}
}
}
}
params->input_count = input_count;
params->longest_path_len = longest_path_len;
params->decompress = (command == COMMAND_DECOMPRESS);
params->test_integrity = (command == COMMAND_TEST_INTEGRITY);
if (input_count > 1 && output_set) return COMMAND_INVALID;
if (params->test_integrity) {
if (params->output_path) return COMMAND_INVALID;
if (params->write_to_stdout) return COMMAND_INVALID;
}
if (strchr(params->suffix, '/') || strchr(params->suffix, '\\')) {
return COMMAND_INVALID;
}
return command;
}
static void PrintVersion(void) {
int major = BROTLI_VERSION >> 24;
int minor = (BROTLI_VERSION >> 12) & 0xFFF;
int patch = BROTLI_VERSION & 0xFFF;
fprintf(stdout, "brotli %d.%d.%d\n", major, minor, patch);
}
static void PrintHelp(const char* name, BROTLI_BOOL error) {
FILE* media = error ? stderr : stdout;
/* String is cut to pieces with length less than 509, to conform C90 spec. */
fprintf(media,
"Usage: %s [OPTION]... [FILE]...\n",
name);
fprintf(media,
"Options:\n"
" -# compression level (0-9)\n"
" -c, --stdout write on standard output\n"
" -d, --decompress decompress\n"
" -f, --force force output file overwrite\n"
" -h, --help display this help and exit\n");
fprintf(media,
" -j, --rm remove source file(s)\n"
" -k, --keep keep source file(s) (default)\n"
" -n, --no-copy-stat do not copy source file(s) attributes\n"
" -o FILE, --output=FILE output file (only if 1 input file)\n");
fprintf(media,
" -q NUM, --quality=NUM compression level (%d-%d)\n",
BROTLI_MIN_QUALITY, BROTLI_MAX_QUALITY);
fprintf(media,
" -t, --test test compressed file integrity\n"
" -v, --verbose verbose mode\n");
fprintf(media,
" -w NUM, --lgwin=NUM set LZ77 window size (0, %d-%d)\n",
BROTLI_MIN_WINDOW_BITS, BROTLI_MAX_WINDOW_BITS);
fprintf(media,
" window size = 2**NUM - 16\n"
" 0 lets compressor choose the optimal value\n");
fprintf(media,
" -S SUF, --suffix=SUF output file suffix (default:'%s')\n",
DEFAULT_SUFFIX);
fprintf(media,
" -V, --version display version and exit\n"
" -Z, --best use best compression level (11) (default)\n"
"Simple options could be coalesced, i.e. '-9kf' is equivalent to '-9 -k -f'.\n"
"With no FILE, or when FILE is -, read standard input.\n"
"All arguments after '--' are treated as files.\n");
}
static const char* PrintablePath(const char* path) {
return path ? path : "con";
}
static BROTLI_BOOL OpenInputFile(const char* input_path, FILE** f) {
*f = NULL;
if (!input_path) {
*f = fdopen(MAKE_BINARY(STDIN_FILENO), "rb");
return BROTLI_TRUE;
}
*f = fopen(input_path, "rb");
if (!*f) {
fprintf(stderr, "failed to open input file [%s]: %s\n",
PrintablePath(input_path), strerror(errno));
return BROTLI_FALSE;
}
return BROTLI_TRUE;
}
static BROTLI_BOOL OpenOutputFile(const char* output_path, FILE** f,
BROTLI_BOOL force) {
int fd;
*f = NULL;
if (!output_path) {
*f = fdopen(MAKE_BINARY(STDOUT_FILENO), "wb");
return BROTLI_TRUE;
}
fd = open(output_path, O_CREAT | (force ? 0 : O_EXCL) | O_WRONLY | O_TRUNC,
S_IRUSR | S_IWUSR);
if (fd < 0) {
fprintf(stderr, "failed to open output file [%s]: %s\n",
PrintablePath(output_path), strerror(errno));
return BROTLI_FALSE;
}
*f = fdopen(fd, "wb");
if (!*f) {
fprintf(stderr, "failed to open output file [%s]: %s\n",
PrintablePath(output_path), strerror(errno));
return BROTLI_FALSE;
}
return BROTLI_TRUE;
}
static int64_t FileSize(const char* path) {
FILE* f = fopen(path, "rb");
int64_t retval;
if (f == NULL) {
return -1;
}
if (fseek(f, 0L, SEEK_END) != 0) {
fclose(f);
return -1;
}
retval = ftell(f);
if (fclose(f) != 0) {
return -1;
}
return retval;
}
/* Copy file times and permissions.
TODO: this is a "best effort" implementation; honest cross-platform
fully featured implementation is way too hacky; add more hacks by request. */
static void CopyStat(const char* input_path, const char* output_path) {
struct stat statbuf;
struct utimbuf times;
int res;
if (input_path == 0 || output_path == 0) {
return;
}
if (stat(input_path, &statbuf) != 0) {
return;
}
times.actime = statbuf.st_atime;
times.modtime = statbuf.st_mtime;
utime(output_path, &times);
res = chmod(output_path, statbuf.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO));
if (res != 0) {
fprintf(stderr, "setting access bits failed for [%s]: %s\n",
PrintablePath(output_path), strerror(errno));
}
res = chown(output_path, (uid_t)-1, statbuf.st_gid);
if (res != 0) {
fprintf(stderr, "setting group failed for [%s]: %s\n",
PrintablePath(output_path), strerror(errno));
}
res = chown(output_path, statbuf.st_uid, (gid_t)-1);
if (res != 0) {
fprintf(stderr, "setting user failed for [%s]: %s\n",
PrintablePath(output_path), strerror(errno));
}
}
static BROTLI_BOOL NextFile(Context* context) {
const char* arg;
size_t arg_len;
/* Iterator points to last used arg; increment to search for the next one. */
context->iterator++;
context->input_file_length = -1;
/* No input path; read from console. */
if (context->input_count == 0) {
if (context->iterator > 1) return BROTLI_FALSE;
context->current_input_path = NULL;
/* Either write to the specified path, or to console. */
context->current_output_path = context->output_path;
return BROTLI_TRUE;
}
/* Skip option arguments. */
while (context->iterator == context->not_input_indices[context->ignore]) {
context->iterator++;
context->ignore++;
}
/* All args are scanned already. */
if (context->iterator >= context->argc) return BROTLI_FALSE;
/* Iterator now points to the input file name. */
arg = context->argv[context->iterator];
arg_len = strlen(arg);
/* Read from console. */
if (arg_len == 1 && arg[0] == '-') {
context->current_input_path = NULL;
context->current_output_path = context->output_path;
return BROTLI_TRUE;
}
context->current_input_path = arg;
context->input_file_length = FileSize(arg);
context->current_output_path = context->output_path;
if (context->output_path) return BROTLI_TRUE;
if (context->write_to_stdout) return BROTLI_TRUE;
strcpy(context->modified_path, arg);
context->current_output_path = context->modified_path;
/* If output is not specified, input path suffix should match. */
if (context->decompress) {
size_t suffix_len = strlen(context->suffix);
char* name = (char*)FileName(context->modified_path);
char* name_suffix;
size_t name_len = strlen(name);
if (name_len < suffix_len + 1) {
fprintf(stderr, "empty output file name for [%s] input file\n",
PrintablePath(arg));
context->iterator_error = BROTLI_TRUE;
return BROTLI_FALSE;
}
name_suffix = name + name_len - suffix_len;
if (strcmp(context->suffix, name_suffix) != 0) {
fprintf(stderr, "input file [%s] suffix mismatch\n",
PrintablePath(arg));
context->iterator_error = BROTLI_TRUE;
return BROTLI_FALSE;
}
name_suffix[0] = 0;
return BROTLI_TRUE;
} else {
strcpy(context->modified_path + arg_len, context->suffix);
return BROTLI_TRUE;
}
}
static BROTLI_BOOL OpenFiles(Context* context) {
BROTLI_BOOL is_ok = OpenInputFile(context->current_input_path, &context->fin);
if (!context->test_integrity && is_ok) {
is_ok = OpenOutputFile(
context->current_output_path, &context->fout, context->force_overwrite);
}
return is_ok;
}
static BROTLI_BOOL CloseFiles(Context* context, BROTLI_BOOL success) {
BROTLI_BOOL is_ok = BROTLI_TRUE;
if (!context->test_integrity && context->fout) {
if (!success && context->current_output_path) {
unlink(context->current_output_path);
}
if (fclose(context->fout) != 0) {
if (success) {
fprintf(stderr, "fclose failed [%s]: %s\n",
PrintablePath(context->current_output_path), strerror(errno));
}
is_ok = BROTLI_FALSE;
}
/* TOCTOU violation, but otherwise it is impossible to set file times. */
if (success && is_ok && context->copy_stat) {
CopyStat(context->current_input_path, context->current_output_path);
}
}
if (context->fin) {
if (fclose(context->fin) != 0) {
if (is_ok) {
fprintf(stderr, "fclose failed [%s]: %s\n",
PrintablePath(context->current_input_path), strerror(errno));
}
is_ok = BROTLI_FALSE;
}
}
if (success && context->junk_source && context->current_input_path) {
unlink(context->current_input_path);
}
context->fin = NULL;
context->fout = NULL;
return is_ok;
}
static const size_t kFileBufferSize = 1 << 19;
static void InitializeBuffers(Context* context) {
context->available_in = 0;
context->next_in = NULL;
context->available_out = kFileBufferSize;
context->next_out = context->output;
}
static BROTLI_BOOL HasMoreInput(Context* context) {
return feof(context->fin) ? BROTLI_FALSE : BROTLI_TRUE;
}
static BROTLI_BOOL ProvideInput(Context* context) {
context->available_in =
fread(context->input, 1, kFileBufferSize, context->fin);
context->next_in = context->input;
if (ferror(context->fin)) {
fprintf(stderr, "failed to read input [%s]: %s\n",
PrintablePath(context->current_input_path), strerror(errno));
return BROTLI_FALSE;
}
return BROTLI_TRUE;
}
/* Internal: should be used only in Provide-/Flush-Output. */
static BROTLI_BOOL WriteOutput(Context* context) {
size_t out_size = (size_t)(context->next_out - context->output);
if (out_size == 0) return BROTLI_TRUE;
if (context->test_integrity) return BROTLI_TRUE;
fwrite(context->output, 1, out_size, context->fout);
if (ferror(context->fout)) {
fprintf(stderr, "failed to write output [%s]: %s\n",
PrintablePath(context->current_output_path), strerror(errno));
return BROTLI_FALSE;
}
return BROTLI_TRUE;
}
static BROTLI_BOOL ProvideOutput(Context* context) {
if (!WriteOutput(context)) return BROTLI_FALSE;
context->available_out = kFileBufferSize;
context->next_out = context->output;
return BROTLI_TRUE;
}
static BROTLI_BOOL FlushOutput(Context* context) {
if (!WriteOutput(context)) return BROTLI_FALSE;
context->available_out = 0;
return BROTLI_TRUE;
}
static BROTLI_BOOL DecompressFile(Context* context, BrotliDecoderState* s) {
BrotliDecoderResult result = BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT;
InitializeBuffers(context);
for (;;) {
if (result == BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT) {
if (!HasMoreInput(context)) {
fprintf(stderr, "corrupt input [%s]\n",
PrintablePath(context->current_input_path));
return BROTLI_FALSE;
}
if (!ProvideInput(context)) return BROTLI_FALSE;
} else if (result == BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT) {
if (!ProvideOutput(context)) return BROTLI_FALSE;
} else if (result == BROTLI_DECODER_RESULT_SUCCESS) {
if (!FlushOutput(context)) return BROTLI_FALSE;
if (context->available_in != 0 || HasMoreInput(context)) {
fprintf(stderr, "corrupt input [%s]\n",
PrintablePath(context->current_input_path));
return BROTLI_FALSE;
}
return BROTLI_TRUE;
} else {
fprintf(stderr, "corrupt input [%s]\n",
PrintablePath(context->current_input_path));
return BROTLI_FALSE;
}
result = BrotliDecoderDecompressStream(s, &context->available_in,
&context->next_in, &context->available_out, &context->next_out, 0);
}
}
static BROTLI_BOOL DecompressFiles(Context* context) {
while (NextFile(context)) {
BROTLI_BOOL is_ok = BROTLI_TRUE;
BrotliDecoderState* s = BrotliDecoderCreateInstance(NULL, NULL, NULL);
if (!s) {
fprintf(stderr, "out of memory\n");
return BROTLI_FALSE;
}
/* This allows decoding "large-window" streams. Though it creates
fragmentation (new builds decode streams that old builds don't),
it is better from used experience perspective. */
BrotliDecoderSetParameter(s, BROTLI_DECODER_PARAM_LARGE_WINDOW, 1u);
is_ok = OpenFiles(context);
if (is_ok && !context->current_input_path &&
!context->force_overwrite && isatty(STDIN_FILENO)) {
fprintf(stderr, "Use -h help. Use -f to force input from a terminal.\n");
is_ok = BROTLI_FALSE;
}
if (is_ok) is_ok = DecompressFile(context, s);
BrotliDecoderDestroyInstance(s);
if (!CloseFiles(context, is_ok)) is_ok = BROTLI_FALSE;
if (!is_ok) return BROTLI_FALSE;
}
return BROTLI_TRUE;
}
static BROTLI_BOOL CompressFile(Context* context, BrotliEncoderState* s) {
BROTLI_BOOL is_eof = BROTLI_FALSE;
InitializeBuffers(context);
for (;;) {
if (context->available_in == 0 && !is_eof) {
if (!ProvideInput(context)) return BROTLI_FALSE;
is_eof = !HasMoreInput(context);
}
if (!BrotliEncoderCompressStream(s,
is_eof ? BROTLI_OPERATION_FINISH : BROTLI_OPERATION_PROCESS,
&context->available_in, &context->next_in,
&context->available_out, &context->next_out, NULL)) {
/* Should detect OOM? */
fprintf(stderr, "failed to compress data [%s]\n",
PrintablePath(context->current_input_path));
return BROTLI_FALSE;
}
if (context->available_out == 0) {
if (!ProvideOutput(context)) return BROTLI_FALSE;
}
if (BrotliEncoderIsFinished(s)) {
return FlushOutput(context);
}
}
}
static BROTLI_BOOL CompressFiles(Context* context) {
while (NextFile(context)) {
BROTLI_BOOL is_ok = BROTLI_TRUE;
BrotliEncoderState* s = BrotliEncoderCreateInstance(NULL, NULL, NULL);
if (!s) {
fprintf(stderr, "out of memory\n");
return BROTLI_FALSE;
}
BrotliEncoderSetParameter(s,
BROTLI_PARAM_QUALITY, (uint32_t)context->quality);
if (context->lgwin > 0) {
/* Specified by user. */
/* Do not enable "large-window" extension, if not required. */
if (context->lgwin > BROTLI_MAX_WINDOW_BITS) {
BrotliEncoderSetParameter(s, BROTLI_PARAM_LARGE_WINDOW, 1u);
}
BrotliEncoderSetParameter(s,
BROTLI_PARAM_LGWIN, (uint32_t)context->lgwin);
} else {
/* 0, or not specified by user; could be chosen by compressor. */
uint32_t lgwin = DEFAULT_LGWIN;
/* Use file size to limit lgwin. */
if (context->input_file_length >= 0) {
lgwin = BROTLI_MIN_WINDOW_BITS;
while (BROTLI_MAX_BACKWARD_LIMIT(lgwin) <
(uint64_t)context->input_file_length) {
lgwin++;
if (lgwin == BROTLI_MAX_WINDOW_BITS) break;
}
}
BrotliEncoderSetParameter(s, BROTLI_PARAM_LGWIN, lgwin);
}
if (context->input_file_length > 0) {
uint32_t size_hint = context->input_file_length < (1 << 30) ?
(uint32_t)context->input_file_length : (1u << 30);
BrotliEncoderSetParameter(s, BROTLI_PARAM_SIZE_HINT, size_hint);
}
is_ok = OpenFiles(context);
if (is_ok && !context->current_output_path &&
!context->force_overwrite && isatty(STDOUT_FILENO)) {
fprintf(stderr, "Use -h help. Use -f to force output to a terminal.\n");
is_ok = BROTLI_FALSE;
}
if (is_ok) is_ok = CompressFile(context, s);
BrotliEncoderDestroyInstance(s);
if (!CloseFiles(context, is_ok)) is_ok = BROTLI_FALSE;
if (!is_ok) return BROTLI_FALSE;
}
return BROTLI_TRUE;
}
int main(int argc, char** argv) {
Command command;
Context context;
BROTLI_BOOL is_ok = BROTLI_TRUE;
int i;
context.quality = 11;
context.lgwin = -1;
context.force_overwrite = BROTLI_FALSE;
context.junk_source = BROTLI_FALSE;
context.copy_stat = BROTLI_TRUE;
context.test_integrity = BROTLI_FALSE;
context.verbose = BROTLI_FALSE;
context.write_to_stdout = BROTLI_FALSE;
context.decompress = BROTLI_FALSE;
context.large_window = BROTLI_FALSE;
context.output_path = NULL;
context.suffix = DEFAULT_SUFFIX;
for (i = 0; i < MAX_OPTIONS; ++i) context.not_input_indices[i] = 0;
context.longest_path_len = 1;
context.input_count = 0;
context.argc = argc;
context.argv = argv;
context.modified_path = NULL;
context.iterator = 0;
context.ignore = 0;
context.iterator_error = BROTLI_FALSE;
context.buffer = NULL;
context.current_input_path = NULL;
context.current_output_path = NULL;
context.fin = NULL;
context.fout = NULL;
command = ParseParams(&context);
if (command == COMMAND_COMPRESS || command == COMMAND_DECOMPRESS ||
command == COMMAND_TEST_INTEGRITY) {
if (is_ok) {
size_t modified_path_len =
context.longest_path_len + strlen(context.suffix) + 1;
context.modified_path = (char*)malloc(modified_path_len);
context.buffer = (uint8_t*)malloc(kFileBufferSize * 2);
if (!context.modified_path || !context.buffer) {
fprintf(stderr, "out of memory\n");
is_ok = BROTLI_FALSE;
} else {
context.input = context.buffer;
context.output = context.buffer + kFileBufferSize;
}
}
}
if (!is_ok) command = COMMAND_NOOP;
switch (command) {
case COMMAND_NOOP:
break;
case COMMAND_VERSION:
PrintVersion();
break;
case COMMAND_COMPRESS:
is_ok = CompressFiles(&context);
break;
case COMMAND_DECOMPRESS:
case COMMAND_TEST_INTEGRITY:
is_ok = DecompressFiles(&context);
break;
case COMMAND_HELP:
case COMMAND_INVALID:
default:
is_ok = (command == COMMAND_HELP);
PrintHelp(FileName(argv[0]), is_ok);
break;
}
if (context.iterator_error) is_ok = BROTLI_FALSE;
free(context.modified_path);
free(context.buffer);
if (!is_ok) exit(1);
return 0;
}
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