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transmission/libtransmission/utils.cc

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// This file Copyright © 2009-2022 Mnemosyne LLC.
// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
// or any future license endorsed by Mnemosyne LLC.
// License text can be found in the licenses/ folder.
#include <algorithm> // std::sort
#include <array> // std::array
#include <cerrno>
#include <cfloat> // DBL_DIG
#include <chrono>
#include <clocale> // localeconv()
#include <cstdint> // SIZE_MAX
#include <cstdlib> // getenv()
#include <cstring> /* strerror() */
#include <ctime> // nanosleep()
#include <set>
#include <string>
#include <string_view>
#include <vector>
#ifdef _WIN32
#include <windows.h> /* Sleep(), GetEnvironmentVariable() */
#include <shellapi.h> /* CommandLineToArgv() */
#include <ws2tcpip.h> /* WSAStartup() */
#endif
#ifndef _WIN32
#include <sys/stat.h> // mode_t
#endif
#ifdef HAVE_ICONV
#include <iconv.h>
#endif
#define UTF_CPP_CPLUSPLUS 201703L
#include <utf8.h>
#include <event2/buffer.h>
#include <event2/event.h>
#include <fmt/format.h>
#include <fast_float/fast_float.h>
#include "transmission.h"
#include "error-types.h"
#include "error.h"
#include "file.h"
#include "log.h"
#include "mime-types.h"
#include "net.h" // ntohl()
#include "platform-quota.h" /* tr_device_info_create(), tr_device_info_get_disk_space(), tr_device_info_free() */
#include "tr-assert.h"
#include "tr-strbuf.h"
#include "utils.h"
#include "variant.h"
using namespace std::literals;
time_t __tr_current_time = 0;
/***
****
***/
struct timeval tr_gettimeofday()
{
auto const d = std::chrono::system_clock::now().time_since_epoch();
auto const s = std::chrono::duration_cast<std::chrono::seconds>(d);
auto ret = timeval{};
ret.tv_sec = s.count();
ret.tv_usec = std::chrono::duration_cast<std::chrono::microseconds>(d - s).count();
return ret;
}
/***
****
***/
void* tr_malloc(size_t size)
{
return size != 0 ? malloc(size) : nullptr;
}
void* tr_malloc0(size_t size)
{
return size != 0 ? calloc(1, size) : nullptr;
}
void* tr_realloc(void* p, size_t size)
{
void* result = size != 0 ? realloc(p, size) : nullptr;
if (result == nullptr)
{
tr_free(p);
}
return result;
}
void tr_free(void* p)
{
if (p != nullptr)
{
free(p);
}
}
void* tr_memdup(void const* src, size_t byteCount)
{
return memcpy(tr_malloc(byteCount), src, byteCount);
}
/***
****
***/
void tr_timerAdd(struct event& timer, int seconds, int microseconds)
{
auto tv = timeval{};
tv.tv_sec = seconds;
tv.tv_usec = microseconds;
TR_ASSERT(tv.tv_sec >= 0);
TR_ASSERT(tv.tv_usec >= 0);
TR_ASSERT(tv.tv_usec < 1000000);
evtimer_add(&timer, &tv);
}
void tr_timerAddMsec(struct event& timer, int msec)
{
int const seconds = msec / 1000;
int const usec = (msec % 1000) * 1000;
tr_timerAdd(timer, seconds, usec);
}
/**
***
**/
uint8_t* tr_loadFile(std::string_view path_in, size_t* size, tr_error** error)
{
auto const path = tr_pathbuf{ path_in };
/* try to stat the file */
auto info = tr_sys_path_info{};
tr_error* my_error = nullptr;
if (!tr_sys_path_get_info(path.c_str(), 0, &info, &my_error))
{
tr_logAddError(fmt::format(
_("Couldn't read '{path}': {error} ({error_code})"),
fmt::arg("path", path),
fmt::arg("error", my_error->message),
fmt::arg("error_code", my_error->code)));
tr_error_propagate(error, &my_error);
return nullptr;
}
if (info.type != TR_SYS_PATH_IS_FILE)
{
tr_logAddError(fmt::format(_("Couldn't read '{path}': Not a regular file"), fmt::arg("path", path)));
tr_error_set(error, TR_ERROR_EISDIR, "Not a regular file"sv);
return nullptr;
}
/* file size should be able to fit into size_t */
if constexpr (sizeof(info.size) > sizeof(*size))
{
TR_ASSERT(info.size <= SIZE_MAX);
}
/* Load the torrent file into our buffer */
auto const fd = tr_sys_file_open(path.c_str(), TR_SYS_FILE_READ | TR_SYS_FILE_SEQUENTIAL, 0, &my_error);
if (fd == TR_BAD_SYS_FILE)
{
tr_logAddError(fmt::format(
_("Couldn't read '{path}': {error} ({error_code})"),
fmt::arg("path", path),
fmt::arg("error", my_error->message),
fmt::arg("error_code", my_error->code)));
tr_error_propagate(error, &my_error);
return nullptr;
}
auto* buf = static_cast<uint8_t*>(tr_malloc(info.size + 1));
if (!tr_sys_file_read(fd, buf, info.size, nullptr, &my_error))
{
tr_logAddError(fmt::format(
_("Couldn't read '{path}': {error} ({error_code})"),
fmt::arg("path", path),
fmt::arg("error", my_error->message),
fmt::arg("error_code", my_error->code)));
tr_sys_file_close(fd);
tr_free(buf);
tr_error_propagate(error, &my_error);
return nullptr;
}
tr_sys_file_close(fd);
buf[info.size] = '\0';
*size = info.size;
return buf;
}
bool tr_loadFile(std::string_view path_in, std::vector<char>& setme, tr_error** error)
{
auto const path = tr_pathbuf{ path_in };
/* try to stat the file */
auto info = tr_sys_path_info{};
tr_error* my_error = nullptr;
if (!tr_sys_path_get_info(path.c_str(), 0, &info, &my_error))
{
tr_logAddError(fmt::format(
_("Couldn't read '{path}': {error} ({error_code})"),
fmt::arg("path", path),
fmt::arg("error", my_error->message),
fmt::arg("error_code", my_error->code)));
tr_error_propagate(error, &my_error);
return false;
}
if (info.type != TR_SYS_PATH_IS_FILE)
{
tr_logAddError(fmt::format(_("Couldn't read '{path}': Not a regular file"), fmt::arg("path", path)));
tr_error_set(error, TR_ERROR_EISDIR, "Not a regular file"sv);
return false;
}
/* Load the torrent file into our buffer */
auto const fd = tr_sys_file_open(path.c_str(), TR_SYS_FILE_READ | TR_SYS_FILE_SEQUENTIAL, 0, &my_error);
if (fd == TR_BAD_SYS_FILE)
{
tr_logAddError(fmt::format(
_("Couldn't read '{path}': {error} ({error_code})"),
fmt::arg("path", path),
fmt::arg("error", my_error->message),
fmt::arg("error_code", my_error->code)));
tr_error_propagate(error, &my_error);
return false;
}
setme.resize(info.size);
if (!tr_sys_file_read(fd, std::data(setme), info.size, nullptr, &my_error))
{
tr_logAddError(fmt::format(
_("Couldn't read '{path}': {error} ({error_code})"),
fmt::arg("path", path),
fmt::arg("error", my_error->message),
fmt::arg("error_code", my_error->code)));
tr_sys_file_close(fd);
tr_error_propagate(error, &my_error);
return false;
}
tr_sys_file_close(fd);
return true;
}
bool tr_saveFile(std::string_view filename_in, std::string_view contents, tr_error** error)
{
auto const filename = tr_pathbuf{ filename_in };
// follow symlinks to find the "real" file, to make sure the temporary
// we build with tr_sys_file_open_temp() is created on the right partition
if (char* const real_filename = tr_sys_path_resolve(filename.c_str()); real_filename != nullptr)
{
if (filename_in != real_filename)
{
auto const saved = tr_saveFile(real_filename, contents, error);
tr_free(real_filename);
return saved;
}
tr_free(real_filename);
}
// Write it to a temp file first.
// This is a safeguard against edge cases, e.g. disk full, crash while writing, etc.
auto tmp = tr_pathbuf{ filename.sv(), ".tmp.XXXXXX"sv };
auto const fd = tr_sys_file_open_temp(std::data(tmp), error);
if (fd == TR_BAD_SYS_FILE)
{
return false;
}
// Save the contents. This might take >1 pass.
auto ok = bool{ true };
while (!std::empty(contents))
{
auto n_written = uint64_t{};
if (!tr_sys_file_write(fd, std::data(contents), std::size(contents), &n_written, error))
{
ok = false;
break;
}
contents.remove_prefix(n_written);
}
// If we saved it to disk successfully, move it from '.tmp' to the correct filename
if (!tr_sys_file_close(fd, error) || !ok || !tr_sys_path_rename(tmp.c_str(), filename.c_str(), error))
{
return false;
}
tr_logAddTrace(fmt::format("Saved '{}'", filename));
return true;
}
tr_disk_space tr_dirSpace(std::string_view dir)
{
if (std::empty(dir))
{
errno = EINVAL;
return { -1, -1 };
}
return tr_device_info_get_disk_space(tr_device_info_create(dir));
}
/****
*****
****/
char* tr_strvDup(std::string_view in)
{
auto const n = std::size(in);
auto* const ret = tr_new(char, n + 1);
std::copy(std::begin(in), std::end(in), ret);
ret[n] = '\0';
return ret;
}
char* tr_strdup(void const* in)
{
return in == nullptr ? nullptr : tr_strvDup(static_cast<char const*>(in));
}
extern "C"
{
int DoMatch(char const* text, char const* p);
}
/* User-level routine. returns whether or not 'text' and 'p' matched */
bool tr_wildmat(std::string_view text, std::string_view pattern)
{
// TODO(ckerr): replace wildmat with base/strings/pattern.cc
// wildmat wants these to be zero-terminated.
return pattern == "*"sv || DoMatch(std::string{ text }.c_str(), std::string{ pattern }.c_str()) != 0;
}
char const* tr_strerror(int i)
{
char const* ret = strerror(i);
if (ret == nullptr)
{
ret = "Unknown Error";
}
return ret;
}
/****
*****
****/
std::string_view tr_strvStrip(std::string_view str)
{
auto constexpr test = [](auto ch)
{
return isspace(ch);
};
auto const it = std::find_if_not(std::begin(str), std::end(str), test);
str.remove_prefix(std::distance(std::begin(str), it));
auto const rit = std::find_if_not(std::rbegin(str), std::rend(str), test);
str.remove_suffix(std::distance(std::rbegin(str), rit));
return str;
}
bool tr_str_has_suffix(char const* str, char const* suffix)
{
if (str == nullptr)
{
return false;
}
if (suffix == nullptr)
{
return true;
}
auto const str_len = strlen(str);
auto const suffix_len = strlen(suffix);
if (str_len < suffix_len)
{
return false;
}
return evutil_ascii_strncasecmp(str + str_len - suffix_len, suffix, suffix_len) == 0;
}
/****
*****
****/
uint64_t tr_time_msec()
{
auto const tv = tr_gettimeofday();
return uint64_t(tv.tv_sec) * 1000 + (tv.tv_usec / 1000);
}
void tr_wait_msec(long int msec)
{
#ifdef _WIN32
Sleep((DWORD)msec);
#else
struct timespec ts;
ts.tv_sec = msec / 1000;
ts.tv_nsec = (msec % 1000) * 1000000;
nanosleep(&ts, nullptr);
#endif
}
/***
****
***/
/*
* Copy src to string dst of size siz. At most siz-1 characters
* will be copied. Always NUL terminates (unless siz == 0).
* Returns strlen (src); if retval >= siz, truncation occurred.
*/
size_t tr_strlcpy(void* vdst, void const* vsrc, size_t siz)
{
auto* dst = static_cast<char*>(vdst);
auto const* const src = static_cast<char const*>(vsrc);
TR_ASSERT(dst != nullptr);
TR_ASSERT(src != nullptr);
#ifdef HAVE_STRLCPY
return strlcpy(dst, src, siz);
#else
auto* d = dst;
auto const* s = src;
size_t n = siz;
/* Copy as many bytes as will fit */
if (n != 0)
{
while (--n != 0)
{
if ((*d++ = *s++) == '\0')
{
break;
}
}
}
/* Not enough room in dst, add NUL and traverse rest of src */
if (n == 0)
{
if (siz != 0)
{
*d = '\0'; /* NUL-terminate dst */
}
while (*s++ != '\0')
{
}
}
return s - (char const*)src - 1; /* count does not include NUL */
#endif
}
/***
****
***/
double tr_getRatio(uint64_t numerator, uint64_t denominator)
{
if (denominator > 0)
{
return numerator / (double)denominator;
}
if (numerator > 0)
{
return TR_RATIO_INF;
}
return TR_RATIO_NA;
}
/***
****
***/
void tr_removeElementFromArray(void* array, size_t index_to_remove, size_t sizeof_element, size_t nmemb)
{
auto* a = static_cast<char*>(array);
memmove(
a + sizeof_element * index_to_remove,
a + sizeof_element * (index_to_remove + 1),
sizeof_element * (--nmemb - index_to_remove));
}
/***
****
***/
bool tr_utf8_validate(std::string_view sv, char const** good_end)
{
auto const* begin = std::data(sv);
auto const* const end = begin + std::size(sv);
auto const* walk = begin;
auto all_good = false;
try
{
while (walk < end)
{
utf8::next(walk, end);
}
all_good = true;
}
catch (utf8::exception const&)
{
all_good = false;
}
if (good_end != nullptr)
{
*good_end = walk;
}
return all_good;
}
static char* strip_non_utf8(std::string_view sv)
{
auto* const ret = tr_new(char, std::size(sv) + 1);
if (ret != nullptr)
{
auto const it = utf8::unchecked::replace_invalid(std::data(sv), std::data(sv) + std::size(sv), ret, '?');
*it = '\0';
}
return ret;
}
static char* to_utf8(std::string_view sv)
{
#ifdef HAVE_ICONV
size_t const buflen = std::size(sv) * 4 + 10;
auto* const out = tr_new(char, buflen);
auto constexpr Encodings = std::array<char const*, 2>{ "CURRENT", "ISO-8859-15" };
for (auto const* test_encoding : Encodings)
{
iconv_t cd = iconv_open("UTF-8", test_encoding);
if (cd == (iconv_t)-1) // NOLINT(performance-no-int-to-ptr)
{
continue;
}
#ifdef ICONV_SECOND_ARGUMENT_IS_CONST
auto const* inbuf = std::data(sv);
#else
auto* inbuf = const_cast<char*>(std::data(sv));
#endif
char* outbuf = out;
size_t inbytesleft = std::size(sv);
size_t outbytesleft = buflen;
auto const rv = iconv(cd, &inbuf, &inbytesleft, &outbuf, &outbytesleft);
iconv_close(cd);
if (rv != size_t(-1))
{
char* const ret = tr_strvDup({ out, buflen - outbytesleft });
tr_free(out);
return ret;
}
}
tr_free(out);
#endif
return strip_non_utf8(sv);
}
std::string& tr_strvUtf8Clean(std::string_view cleanme, std::string& setme)
{
if (tr_utf8_validate(cleanme, nullptr))
{
setme = cleanme;
}
else
{
auto* const tmp = to_utf8(cleanme);
setme.assign(tmp != nullptr ? tmp : "");
tr_free(tmp);
}
return setme;
}
#ifdef _WIN32
char* tr_win32_native_to_utf8(wchar_t const* text, int text_size)
{
return tr_win32_native_to_utf8_ex(text, text_size, 0, 0, nullptr);
}
char* tr_win32_native_to_utf8_ex(
wchar_t const* text,
int text_size,
int extra_chars_before,
int extra_chars_after,
int* real_result_size)
{
char* ret = nullptr;
int size;
if (text_size == -1)
{
text_size = wcslen(text);
}
size = WideCharToMultiByte(CP_UTF8, 0, text, text_size, nullptr, 0, nullptr, nullptr);
if (size == 0)
{
goto fail;
}
ret = tr_new(char, size + extra_chars_before + extra_chars_after + 1);
size = WideCharToMultiByte(CP_UTF8, 0, text, text_size, ret + extra_chars_before, size, nullptr, nullptr);
if (size == 0)
{
goto fail;
}
ret[size + extra_chars_before + extra_chars_after] = '\0';
if (real_result_size != nullptr)
{
*real_result_size = size;
}
return ret;
fail:
tr_free(ret);
return nullptr;
}
wchar_t* tr_win32_utf8_to_native(char const* text, int text_size)
{
return tr_win32_utf8_to_native_ex(text, text_size, 0, 0, nullptr);
}
wchar_t* tr_win32_utf8_to_native_ex(
char const* text,
int text_size,
int extra_chars_before,
int extra_chars_after,
int* real_result_size)
{
wchar_t* ret = nullptr;
int size;
if (text_size == -1)
{
text_size = strlen(text);
}
size = MultiByteToWideChar(CP_UTF8, 0, text, text_size, nullptr, 0);
if (size == 0)
{
goto fail;
}
ret = tr_new(wchar_t, size + extra_chars_before + extra_chars_after + 1);
size = MultiByteToWideChar(CP_UTF8, 0, text, text_size, ret + extra_chars_before, size);
if (size == 0)
{
goto fail;
}
ret[size + extra_chars_before + extra_chars_after] = L'\0';
if (real_result_size != nullptr)
{
*real_result_size = size;
}
return ret;
fail:
tr_free(ret);
return nullptr;
}
char* tr_win32_format_message(uint32_t code)
{
wchar_t* wide_text = nullptr;
DWORD wide_size;
char* text = nullptr;
size_t text_size;
wide_size = FormatMessageW(
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr,
code,
0,
(LPWSTR)&wide_text,
0,
nullptr);
if (wide_size == 0)
{
return tr_strvDup(fmt::format(FMT_STRING("Unknown error ({:#08x})"), code));
}
if (wide_size != 0 && wide_text != nullptr)
{
text = tr_win32_native_to_utf8(wide_text, wide_size);
}
LocalFree(wide_text);
if (text != nullptr)
{
/* Most (all?) messages contain "\r\n" in the end, chop it */
text_size = strlen(text);
while (text_size > 0 && isspace((uint8_t)text[text_size - 1]))
{
text[--text_size] = '\0';
}
}
return text;
}
void tr_win32_make_args_utf8(int* argc, char*** argv)
{
int my_argc;
wchar_t** my_wide_argv;
my_wide_argv = CommandLineToArgvW(GetCommandLineW(), &my_argc);
if (my_wide_argv == nullptr)
{
return;
}
TR_ASSERT(*argc == my_argc);
char** my_argv = tr_new(char*, my_argc + 1);
int processed_argc = 0;
for (int i = 0; i < my_argc; ++i, ++processed_argc)
{
my_argv[i] = tr_win32_native_to_utf8(my_wide_argv[i], -1);
if (my_argv[i] == nullptr)
{
break;
}
}
if (processed_argc < my_argc)
{
for (int i = 0; i < processed_argc; ++i)
{
tr_free(my_argv[i]);
}
tr_free(my_argv);
}
else
{
my_argv[my_argc] = nullptr;
*argc = my_argc;
*argv = my_argv;
/* TODO: Add atexit handler to cleanup? */
}
LocalFree(my_wide_argv);
}
int tr_main_win32(int argc, char** argv, int (*real_main)(int, char**))
{
tr_win32_make_args_utf8(&argc, &argv);
SetConsoleCP(CP_UTF8);
SetConsoleOutputCP(CP_UTF8);
return (*real_main)(argc, argv);
}
#endif
/***
****
***/
struct number_range
{
int low;
int high;
};
/**
* This should be a single number (ex. "6") or a range (ex. "6-9").
* Anything else is an error and will return failure.
*/
static bool parseNumberSection(std::string_view str, number_range& range)
{
auto constexpr Delimiter = "-"sv;
auto const first = tr_parseNum<size_t>(str);
if (!first)
{
return false;
}
range.low = range.high = *first;
if (std::empty(str))
{
return true;
}
if (!tr_strvStartsWith(str, Delimiter))
{
return false;
}
str.remove_prefix(std::size(Delimiter));
auto const second = tr_parseNum<size_t>(str);
if (!second)
{
return false;
}
range.high = *second;
return true;
}
/**
* Given a string like "1-4" or "1-4,6,9,14-51", this allocates and returns an
* array of setmeCount ints of all the values in the array.
* For example, "5-8" will return [ 5, 6, 7, 8 ] and setmeCount will be 4.
* It's the caller's responsibility to call tr_free () on the returned array.
* If a fragment of the string can't be parsed, nullptr is returned.
*/
std::vector<int> tr_parseNumberRange(std::string_view str)
{
auto values = std::set<int>{};
auto token = std::string_view{};
auto range = number_range{};
while (tr_strvSep(&str, &token, ',') && parseNumberSection(token, range))
{
for (auto i = range.low; i <= range.high; ++i)
{
values.insert(i);
}
}
return { std::begin(values), std::end(values) };
}
/***
****
***/
double tr_truncd(double x, int precision)
{
auto buf = std::array<char, 128>{};
auto const [out, len] = fmt::format_to_n(std::data(buf), std::size(buf) - 1, "{:.{}f}", x, DBL_DIG);
*out = '\0';
if (auto* const pt = strstr(std::data(buf), localeconv()->decimal_point); pt != nullptr)
{
pt[precision != 0 ? precision + 1 : 0] = '\0';
}
return atof(std::data(buf));
}
std::string tr_strpercent(double x)
{
if (x < 5.0)
{
return fmt::format("{:.2f}", tr_truncd(x, 2));
}
if (x < 100.0)
{
return fmt::format("{:.1f}", tr_truncd(x, 1));
}
return fmt::format("{:.0f}", x);
}
std::string tr_strratio(double ratio, char const* infinity)
{
if ((int)ratio == TR_RATIO_NA)
{
return _("None");
}
if ((int)ratio == TR_RATIO_INF)
{
auto buf = std::array<char, 64>{};
tr_strlcpy(std::data(buf), infinity, std::size(buf));
return std::data(buf);
}
return tr_strpercent(ratio);
}
/***
****
***/
bool tr_moveFile(std::string_view oldpath_in, std::string_view newpath_in, tr_error** error)
{
auto const oldpath = tr_pathbuf{ oldpath_in };
auto const newpath = tr_pathbuf{ newpath_in };
// make sure the old file exists
auto info = tr_sys_path_info{};
if (!tr_sys_path_get_info(oldpath, 0, &info, error))
{
tr_error_prefix(error, "Unable to get information on old file: ");
return false;
}
if (info.type != TR_SYS_PATH_IS_FILE)
{
tr_error_set(error, TR_ERROR_EINVAL, "Old path does not point to a file."sv);
return false;
}
// ensure the target directory exists
if (auto const newdir = tr_sys_path_dirname(newpath, error);
std::empty(newdir) || !tr_sys_dir_create(newdir.c_str(), TR_SYS_DIR_CREATE_PARENTS, 0777, error))
{
tr_error_prefix(error, "Unable to create directory for new file: ");
return false;
}
/* they might be on the same filesystem... */
if (tr_sys_path_rename(oldpath, newpath))
{
return true;
}
/* Otherwise, copy the file. */
if (!tr_sys_path_copy(oldpath, newpath, error))
{
tr_error_prefix(error, "Unable to copy: ");
return false;
}
if (tr_error* my_error = nullptr; !tr_sys_path_remove(oldpath, &my_error))
{
tr_logAddError(fmt::format(
_("Couldn't remove '{path}': {error} ({error_code})"),
fmt::arg("path", oldpath),
fmt::arg("error", my_error->message),
fmt::arg("error_code", my_error->code)));
tr_error_free(my_error);
}
return true;
}
/***
****
***/
uint64_t tr_htonll(uint64_t x)
{
#ifdef HAVE_HTONLL
return htonll(x);
#else
/* fallback code by bdonlan at https://stackoverflow.com/questions/809902/64-bit-ntohl-in-c/875505#875505 */
union
{
uint32_t lx[2];
uint64_t llx;
} u;
u.lx[0] = htonl(x >> 32);
u.lx[1] = htonl(x & 0xFFFFFFFFULL);
return u.llx;
#endif
}
uint64_t tr_ntohll(uint64_t x)
{
#ifdef HAVE_NTOHLL
return ntohll(x);
#else
/* fallback code by bdonlan at https://stackoverflow.com/questions/809902/64-bit-ntohl-in-c/875505#875505 */
union
{
uint32_t lx[2];
uint64_t llx;
} u;
u.llx = x;
return ((uint64_t)ntohl(u.lx[0]) << 32) | (uint64_t)ntohl(u.lx[1]);
#endif
}
/***
****
****
****
***/
struct formatter_unit
{
std::array<char, 16> name;
uint64_t value;
};
using formatter_units = std::array<formatter_unit, 4>;
enum
{
TR_FMT_KB,
TR_FMT_MB,
TR_FMT_GB,
TR_FMT_TB
};
static void formatter_init(
formatter_units& units,
uint64_t kilo,
char const* kb,
char const* mb,
char const* gb,
char const* tb)
{
uint64_t value = kilo;
tr_strlcpy(std::data(units[TR_FMT_KB].name), kb, std::size(units[TR_FMT_KB].name));
units[TR_FMT_KB].value = value;
value *= kilo;
tr_strlcpy(std::data(units[TR_FMT_MB].name), mb, std::size(units[TR_FMT_MB].name));
units[TR_FMT_MB].value = value;
value *= kilo;
tr_strlcpy(std::data(units[TR_FMT_GB].name), gb, std::size(units[TR_FMT_GB].name));
units[TR_FMT_GB].value = value;
value *= kilo;
tr_strlcpy(std::data(units[TR_FMT_TB].name), tb, std::size(units[TR_FMT_TB].name));
units[TR_FMT_TB].value = value;
}
static char* formatter_get_size_str(formatter_units const& u, char* buf, uint64_t bytes, size_t buflen)
{
formatter_unit const* unit = nullptr;
if (bytes < u[1].value)
{
unit = std::data(u);
}
else if (bytes < u[2].value)
{
unit = &u[1];
}
else if (bytes < u[3].value)
{
unit = &u[2];
}
else
{
unit = &u[3];
}
double value = double(bytes) / unit->value;
auto const* const units = std::data(unit->name);
auto precision = int{};
if (unit->value == 1)
{
precision = 0;
}
else if (value < 100)
{
precision = 2;
}
else
{
precision = 1;
}
auto const [out, len] = fmt::format_to_n(buf, buflen - 1, "{:.{}f} {:s}", value, precision, units);
*out = '\0';
return buf;
}
static formatter_units size_units;
void tr_formatter_size_init(uint64_t kilo, char const* kb, char const* mb, char const* gb, char const* tb)
{
formatter_init(size_units, kilo, kb, mb, gb, tb);
}
std::string tr_formatter_size_B(uint64_t bytes)
{
auto buf = std::array<char, 64>{};
return formatter_get_size_str(size_units, std::data(buf), bytes, std::size(buf));
}
static formatter_units speed_units;
size_t tr_speed_K = 0;
void tr_formatter_speed_init(size_t kilo, char const* kb, char const* mb, char const* gb, char const* tb)
{
tr_speed_K = kilo;
formatter_init(speed_units, kilo, kb, mb, gb, tb);
}
std::string tr_formatter_speed_KBps(double KBps)
{
auto speed = KBps;
if (speed <= 999.95) // 0.0 KB to 999.9 KB
{
return fmt::format("{:d} {:s}", int(speed), std::data(speed_units[TR_FMT_KB].name));
}
double const K = speed_units[TR_FMT_KB].value;
speed /= K;
if (speed <= 99.995) // 0.98 MB to 99.99 MB
{
return fmt::format("{:.2f} {:s}", speed, std::data(speed_units[TR_FMT_MB].name));
}
if (speed <= 999.95) // 100.0 MB to 999.9 MB
{
return fmt::format("{:.1f} {:s}", speed, std::data(speed_units[TR_FMT_MB].name));
}
return fmt::format("{:.1f} {:s}", speed / K, std::data(speed_units[TR_FMT_GB].name));
}
static formatter_units mem_units;
size_t tr_mem_K = 0;
void tr_formatter_mem_init(size_t kilo, char const* kb, char const* mb, char const* gb, char const* tb)
{
tr_mem_K = kilo;
formatter_init(mem_units, kilo, kb, mb, gb, tb);
}
std::string tr_formatter_mem_B(size_t bytes_per_second)
{
auto buf = std::array<char, 64>{};
return formatter_get_size_str(mem_units, std::data(buf), bytes_per_second, std::size(buf));
}
void tr_formatter_get_units(void* vdict)
{
auto* dict = static_cast<tr_variant*>(vdict);
tr_variantDictReserve(dict, 6);
tr_variantDictAddInt(dict, TR_KEY_memory_bytes, mem_units[TR_FMT_KB].value);
tr_variant* l = tr_variantDictAddList(dict, TR_KEY_memory_units, std::size(mem_units));
for (auto const& unit : mem_units)
{
tr_variantListAddStr(l, std::data(unit.name));
}
tr_variantDictAddInt(dict, TR_KEY_size_bytes, size_units[TR_FMT_KB].value);
l = tr_variantDictAddList(dict, TR_KEY_size_units, std::size(size_units));
for (auto const& unit : size_units)
{
tr_variantListAddStr(l, std::data(unit.name));
}
tr_variantDictAddInt(dict, TR_KEY_speed_bytes, speed_units[TR_FMT_KB].value);
l = tr_variantDictAddList(dict, TR_KEY_speed_units, std::size(speed_units));
for (auto const& unit : speed_units)
{
tr_variantListAddStr(l, std::data(unit.name));
}
}
/***
**** ENVIRONMENT
***/
bool tr_env_key_exists(char const* key)
{
TR_ASSERT(key != nullptr);
#ifdef _WIN32
return GetEnvironmentVariableA(key, nullptr, 0) != 0;
#else
return getenv(key) != nullptr;
#endif
}
int tr_env_get_int(char const* key, int default_value)
{
TR_ASSERT(key != nullptr);
#ifdef _WIN32
char value[16];
if (GetEnvironmentVariableA(key, value, TR_N_ELEMENTS(value)) > 1)
{
return atoi(value);
}
#else
if (char const* value = getenv(key); !tr_str_is_empty(value))
{
return atoi(value);
}
#endif
return default_value;
}
char* tr_env_get_string(char const* key, char const* default_value)
{
TR_ASSERT(key != nullptr);
#ifdef _WIN32
wchar_t* wide_key = tr_win32_utf8_to_native(key, -1);
char* value = nullptr;
if (wide_key != nullptr)
{
DWORD const size = GetEnvironmentVariableW(wide_key, nullptr, 0);
if (size != 0)
{
wchar_t* const wide_value = tr_new(wchar_t, size);
if (GetEnvironmentVariableW(wide_key, wide_value, size) == size - 1)
{
value = tr_win32_native_to_utf8(wide_value, size);
}
tr_free(wide_value);
}
tr_free(wide_key);
}
if (value == nullptr && default_value != nullptr)
{
value = tr_strdup(default_value);
}
return value;
#else
char const* value = getenv(key);
if (value == nullptr)
{
value = default_value;
}
return value != nullptr ? tr_strvDup(value) : nullptr;
#endif
}
/***
****
***/
void tr_net_init()
{
static bool initialized = false;
if (!initialized)
{
#ifdef _WIN32
WSADATA wsaData;
WSAStartup(MAKEWORD(2, 2), &wsaData);
#endif
initialized = true;
}
}
/// mime-type
std::string_view tr_get_mime_type_for_filename(std::string_view filename)
{
auto constexpr compare = [](mime_type_suffix const& entry, auto const& suffix)
{
return entry.suffix < suffix;
};
if (auto const pos = filename.rfind('.'); pos != std::string_view::npos)
{
auto const suffix_lc = tr_strlower(filename.substr(pos + 1));
auto const it = std::lower_bound(std::begin(mime_type_suffixes), std::end(mime_type_suffixes), suffix_lc, compare);
if (it != std::end(mime_type_suffixes) && suffix_lc == it->suffix)
{
return it->mime_type;
}
}
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types
// application/octet-stream is the default value.
// An unknown file type should use this type.
auto constexpr Fallback = "application/octet-stream"sv;
return Fallback;
}
/// parseNum()
#if defined(__GNUC__) && !__has_include(<charconv>)
#include <iomanip> // std::setbase
#include <sstream>
template<typename T, std::enable_if_t<std::is_integral<T>::value, bool> = true>
[[nodiscard]] std::optional<T> tr_parseNum(std::string_view& sv, int base)
{
auto val = T{};
auto const str = std::string(std::data(sv), std::min(std::size(sv), size_t{ 64 }));
auto sstream = std::stringstream{ str };
auto const oldpos = sstream.tellg();
/* The base parameter only works for bases 8, 10 and 16.
All other bases will be converted to 0 which activates the
prefix based parsing and therefore decimal in our usual cases.
This differs from the from_chars solution below. */
sstream >> std::setbase(base) >> val;
auto const newpos = sstream.tellg();
if ((newpos == oldpos) || (sstream.fail() && !sstream.eof()))
{
return std::nullopt;
}
sv.remove_prefix(sstream.eof() ? std::size(sv) : newpos - oldpos);
return val;
}
#else // #if defined(__GNUC__) && !__has_include(<charconv>)
#include <charconv> // std::from_chars()
template<typename T, std::enable_if_t<std::is_integral<T>::value, bool>>
[[nodiscard]] std::optional<T> tr_parseNum(std::string_view& sv, int base)
{
auto val = T{};
auto const* const begin_ch = std::data(sv);
auto const* const end_ch = begin_ch + std::size(sv);
/* The base parameter works for any base from 2 to 36 (inclusive).
This is different from the behaviour of the stringstream
based solution above. */
auto const result = std::from_chars(begin_ch, end_ch, val, base);
if (result.ec != std::errc{})
{
return std::nullopt;
}
sv.remove_prefix(result.ptr - std::data(sv));
return val;
}
#endif // #if defined(__GNUC__) && !__has_include(<charconv>)
template std::optional<int64_t> tr_parseNum(std::string_view& sv, int base);
template std::optional<int> tr_parseNum(std::string_view& sv, int base);
template std::optional<size_t> tr_parseNum(std::string_view& sv, int base);
#ifndef _WIN32
template std::optional<mode_t> tr_parseNum(std::string_view& sv, int base);
#endif
template<typename T, std::enable_if_t<std::is_floating_point<T>::value, bool>>
[[nodiscard]] std::optional<T> tr_parseNum(std::string_view& sv)
{
auto const* const begin_ch = std::data(sv);
auto const* const end_ch = begin_ch + std::size(sv);
auto val = T{};
auto const result = fast_float::from_chars(begin_ch, end_ch, val);
if (result.ec != std::errc{})
{
return std::nullopt;
}
sv.remove_prefix(result.ptr - std::data(sv));
return val;
}
template std::optional<double> tr_parseNum(std::string_view& sv);
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