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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "utf-conv.h"
#ifndef WC_ERR_INVALID_CHARS
# define WC_ERR_INVALID_CHARS 0x80
#endif
GIT_INLINE(DWORD) get_wc_flags(void)
{
static char inited = 0;
static DWORD flags;
/* Invalid code point check supported on Vista+ only */
if (!inited) {
flags = git_has_win32_version(6, 0, 0) ? WC_ERR_INVALID_CHARS : 0;
inited = 1;
}
return flags;
}
GIT_INLINE(void) git__set_errno(void)
{
if (GetLastError() == ERROR_INSUFFICIENT_BUFFER)
errno = ENAMETOOLONG;
else
errno = EINVAL;
}
/**
* Converts a UTF-8 string to wide characters.
*
* @param dest The buffer to receive the wide string.
* @param dest_size The size of the buffer, in characters.
* @param src The UTF-8 string to convert.
* @return The length of the wide string, in characters (not counting the NULL terminator), or < 0 for failure
*/
int git__utf8_to_16(wchar_t *dest, size_t dest_size, const char *src)
{
int len;
/* Length of -1 indicates NULL termination of the input string. Subtract 1 from the result to
* turn 0 into -1 (an error code) and to not count the NULL terminator as part of the string's
* length. MultiByteToWideChar never returns int's minvalue, so underflow is not possible */
if ((len = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, src, -1, dest, (int)dest_size) - 1) < 0)
git__set_errno();
return len;
}
/**
* Converts a wide string to UTF-8.
*
* @param dest The buffer to receive the UTF-8 string.
* @param dest_size The size of the buffer, in bytes.
* @param src The wide string to convert.
* @return The length of the UTF-8 string, in bytes (not counting the NULL terminator), or < 0 for failure
*/
int git__utf16_to_8(char *dest, size_t dest_size, const wchar_t *src)
{
int len;
/* Length of -1 indicates NULL termination of the input string. Subtract 1 from the result to
* turn 0 into -1 (an error code) and to not count the NULL terminator as part of the string's
* length. WideCharToMultiByte never returns int's minvalue, so underflow is not possible */
if ((len = WideCharToMultiByte(CP_UTF8, get_wc_flags(), src, -1, dest, (int)dest_size, NULL, NULL) - 1) < 0)
git__set_errno();
return len;
}
/**
* Converts a UTF-8 string to wide characters.
* Memory is allocated to hold the converted string.
* The caller is responsible for freeing the string with git__free.
*
* @param dest Receives a pointer to the wide string.
* @param src The UTF-8 string to convert.
* @return The length of the wide string, in characters (not counting the NULL terminator), or < 0 for failure
*/
int git__utf8_to_16_alloc(wchar_t **dest, const char *src)
{
int utf16_size;
*dest = NULL;
/* Length of -1 indicates NULL termination of the input string */
utf16_size = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, src, -1, NULL, 0);
if (!utf16_size) {
git__set_errno();
return -1;
}
if (GIT_ALLOC_OVERFLOW_MULTIPLY(utf16_size, sizeof(wchar_t)) ||
!(*dest = git__malloc(utf16_size * sizeof(wchar_t)))) {
errno = ENOMEM;
return -1;
}
utf16_size = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, src, -1, *dest, utf16_size);
if (!utf16_size) {
git__set_errno();
git__free(*dest);
*dest = NULL;
}
/* Subtract 1 from the result to turn 0 into -1 (an error code) and to not count the NULL
* terminator as part of the string's length. MultiByteToWideChar never returns int's minvalue,
* so underflow is not possible */
return utf16_size - 1;
}
/**
* Converts a wide string to UTF-8.
* Memory is allocated to hold the converted string.
* The caller is responsible for freeing the string with git__free.
*
* @param dest Receives a pointer to the UTF-8 string.
* @param src The wide string to convert.
* @return The length of the UTF-8 string, in bytes (not counting the NULL terminator), or < 0 for failure
*/
int git__utf16_to_8_alloc(char **dest, const wchar_t *src)
{
int utf8_size;
DWORD dwFlags = get_wc_flags();
*dest = NULL;
/* Length of -1 indicates NULL termination of the input string */
utf8_size = WideCharToMultiByte(CP_UTF8, dwFlags, src, -1, NULL, 0, NULL, NULL);
if (!utf8_size) {
git__set_errno();
return -1;
}
*dest = git__malloc(utf8_size);
if (!*dest) {
errno = ENOMEM;
return -1;
}
utf8_size = WideCharToMultiByte(CP_UTF8, dwFlags, src, -1, *dest, utf8_size, NULL, NULL);
if (!utf8_size) {
git__set_errno();
git__free(*dest);
*dest = NULL;
}
/* Subtract 1 from the result to turn 0 into -1 (an error code) and to not count the NULL
* terminator as part of the string's length. MultiByteToWideChar never returns int's minvalue,
* so underflow is not possible */
return utf8_size - 1;
}
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