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libisofs/src/util.c

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/*
* Copyright (c) 2007 Vreixo Formoso
* Copyright (c) 2007 Mario Danic
*
* This file is part of the libisofs project; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation. See COPYING file for details.
*/
#include "util.h"
#include "error.h"
#include <stdlib.h>
#include <wchar.h>
#include <iconv.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
int int_pow(int base, int power)
{
int result = 1;
while (--power >= 0) {
result *= base;
}
return result;
}
/**
* Convert a str in a specified codeset to WCHAR_T.
* The result must be free() when no more needed
*
* @return
* 1 success, < 0 error
*/
static
int str2wchar(const char *icharset, const char *input, wchar_t **output)
{
iconv_t conv;
size_t inbytes;
size_t outbytes;
char *ret;
char *src;
wchar_t *wstr;
size_t n;
if (icharset == NULL || input == NULL || output == NULL) {
return ISO_NULL_POINTER;
}
conv = iconv_open("WCHAR_T", icharset);
if (conv == (iconv_t)-1) {
return ISO_CHARSET_CONV_ERROR;
}
inbytes = strlen(input);
outbytes = (inbytes + 1) * sizeof(wchar_t);
/* we are sure that numchars <= inbytes */
wstr = malloc(outbytes);
if (wstr == NULL) {
return ISO_MEM_ERROR;
}
ret = (char *)wstr;
src = (char *)input;
n = iconv(conv, &src, &inbytes, &ret, &outbytes);
while (n == -1) {
if (errno == E2BIG) {
/* error, should never occur */
iconv_close(conv);
free(wstr);
return ISO_CHARSET_CONV_ERROR;
} else {
wchar_t *wret;
/*
* Invalid input string charset.
* This can happen if input is in fact encoded in a charset
* different than icharset.
* We can't do anything better than replace by "_" and continue.
*/
/* TODO we need a way to report this */
/* printf("String %s is not encoded in %s\n", str, codeset); */
inbytes--;
src++;
wret = (wchar_t*) ret;
*wret++ = (wchar_t) '_';
ret = (char *) wret;
outbytes -= sizeof(wchar_t);
if (!inbytes)
break;
n = iconv(conv, &src, &inbytes, &ret, &outbytes);
}
}
iconv_close(conv);
*( (wchar_t *)ret )='\0';
*output = wstr;
return ISO_SUCCESS;
}
int str2ascii(const char *icharset, const char *input, char **output)
{
int result;
wchar_t *wsrc_;
char *ret;
char *ret_;
char *src;
iconv_t conv;
size_t numchars;
size_t outbytes;
size_t inbytes;
size_t n;
if (icharset == NULL || input == NULL || output == NULL) {
return ISO_NULL_POINTER;
}
/* convert the string to a wide character string. Note: outbytes
* is in fact the number of characters in the string and doesn't
* include the last NULL character.
*/
result = str2wchar(icharset, input, &wsrc_);
if (result < 0) {
return result;
}
src = (char *)wsrc_;
numchars = wcslen(wsrc_);
inbytes = numchars * sizeof(wchar_t);
ret_ = malloc(numchars + 1);
if (ret_ == NULL) {
return ISO_MEM_ERROR;
}
outbytes = numchars;
ret = ret_;
/* initialize iconv */
conv = iconv_open("ASCII", "WCHAR_T");
if (conv == (iconv_t)-1) {
free(wsrc_);
free(ret_);
return ISO_CHARSET_CONV_ERROR;
}
n = iconv(conv, &src, &inbytes, &ret, &outbytes);
while(n == -1) {
/* The destination buffer is too small. Stops here. */
if (errno == E2BIG)
break;
/* An incomplete multi bytes sequence was found. We
* can't do anything here. That's quite unlikely. */
if (errno == EINVAL)
break;
/* The last possible error is an invalid multi bytes
* sequence. Just replace the character with a "_".
* Probably the character doesn't exist in ascii like
* "é, è, à, ç, ..." in French. */
*ret++ = '_';
outbytes--;
if (!outbytes)
break;
/* There was an error with one character but some other remain
* to be converted. That's probably a multibyte character.
* See above comment. */
src += sizeof(wchar_t);
inbytes -= sizeof(wchar_t);
if (!inbytes)
break;
n = iconv(conv, &src, &inbytes, &ret, &outbytes);
}
iconv_close(conv);
*ret='\0';
free(wsrc_);
*output = ret_;
return ISO_SUCCESS;
}
static int valid_d_char(char c)
{
return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c == '_');
}
static int valid_a_char(char c)
{
return (c >= ' ' && c <= '"') || (c >= '%' && c <= '?')
|| (c >= 'A' && c <= 'Z') || (c == '_');
}
static
char *iso_dirid(const char *src, int size)
{
size_t len, i;
char name[32];
len = strlen(src);
if (len > size) {
len = size;
}
for (i = 0; i < len; i++) {
char c = toupper(src[i]);
name[i] = valid_d_char(c) ? c : '_';
}
name[len] = '\0';
return strdup(name);
}
char *iso_1_dirid(const char *src)
{
return iso_dirid(src, 8);
}
char *iso_2_dirid(const char *src)
{
return iso_dirid(src, 31);
}
char *iso_1_fileid(const char *src)
{
char *dot; /* Position of the last dot in the filename, will be used
to calculate lname and lext. */
int lname, lext, pos, i;
char dest[13]; /* 13 = 8 (name) + 1 (.) + 3 (ext) + 1 (\0) */
if (src == NULL) {
return NULL;
}
dot = strrchr(src, '.');
lext = dot ? strlen(dot + 1) : 0;
lname = strlen(src) - lext - (dot ? 1 : 0);
/* If we can't build a filename, return NULL. */
if (lname == 0 && lext == 0) {
return NULL;
}
pos = 0;
/* Convert up to 8 characters of the filename. */
for (i = 0; i < lname && i < 8; i++) {
char c = toupper(src[i]);
dest[pos++] = valid_d_char(c) ? c : '_';
}
/* This dot is mandatory, even if there is no extension. */
dest[pos++] = '.';
/* Convert up to 3 characters of the extension, if any. */
for (i = 0; i < lext && i < 3; i++) {
char c = toupper(src[lname + 1 + i]);
dest[pos++] = valid_d_char(c) ? c : '_';
}
dest[pos] = '\0';
return strdup(dest);
}
char *iso_2_fileid(const char *src)
{
char *dot;
int lname, lext, lnname, lnext, pos, i;
char dest[32]; /* 32 = 30 (name + ext) + 1 (.) + 1 (\0) */
if (src == NULL) {
return NULL;
}
dot = strrchr(src, '.');
/*
* Since the maximum length can be divided freely over the name and
* extension, we need to calculate their new lengths (lnname and
* lnext). If the original filename is too long, we start by trimming
* the extension, but keep a minimum extension length of 3.
*/
if (dot == NULL || *(dot + 1) == '\0') {
lname = strlen(src);
lnname = (lname > 30) ? 30 : lname;
lext = lnext = 0;
} else {
lext = strlen(dot + 1);
lname = strlen(src) - lext - 1;
lnext = (strlen(src) > 31 && lext > 3)
? (lname < 27 ? 30 - lname : 3) : lext;
lnname = (strlen(src) > 31) ? 30 - lnext : lname;
}
if (lnname == 0 && lnext == 0) {
return NULL;
}
pos = 0;
/* Convert up to lnname characters of the filename. */
for (i = 0; i < lnname; i++) {
char c = toupper(src[i]);
dest[pos++] = valid_d_char(c) ? c : '_';
}
dest[pos++] = '.';
/* Convert up to lnext characters of the extension, if any. */
for (i = 0; i < lnext; i++) {
char c = toupper(src[lname + 1 + i]);
dest[pos++] = valid_d_char(c) ? c : '_';
}
dest[pos] = '\0';
return strdup(dest);
}
//void iso_dirid(char *src, int maxlen)
//{
// size_t len, i;
//
// len = strlen(src);
// if (len > maxlen) {
// src[maxlen] = '\0';
// len = maxlen;
// }
// for (i = 0; i < len; i++) {
// char c = toupper(src[i]);
// src[i] = valid_d_char(c) ? c : '_';
// }
//}
//void iso_1_fileid(char *src)
//{
// char *dot; /* Position of the last dot in the filename, will be used to
// calculate lname and lext. */
// int lname, lext, pos, i;
//
// dot = strrchr(src, '.');
//
// lext = dot ? strlen(dot + 1) : 0;
// lname = strlen(src) - lext - (dot ? 1 : 0);
//
// /* If we can't build a filename, return. */
// if (lname == 0 && lext == 0) {
// return;
// }
//
// pos = 0;
// /* Convert up to 8 characters of the filename. */
// for (i = 0; i < lname && i < 8; i++) {
// char c = toupper(src[i]);
// src[pos++] = valid_d_char(c) ? c : '_';
// }
//
// /* This dot is mandatory, even if there is no extension. */
// src[pos++] = '.';
//
// /* Convert up to 3 characters of the extension, if any. */
// for (i = 0; i < lext && i < 3; i++) {
// char c = toupper(src[lname + 1 + i]);
// src[pos++] = valid_d_char(c) ? c : '_';
// }
// src[pos] = '\0';
//}
//
//void iso_2_fileid(char *src)
//{
// char *dot;
// int lname, lext, lnname, lnext, pos, i;
//
// if (!src)
// return;
//
// dot = strrchr(src, '.');
//
// /*
// * Since the maximum length can be divided freely over the name and
// * extension, we need to calculate their new lengths (lnname and
// * lnext). If the original filename is too long, we start by trimming
// * the extension, but keep a minimum extension length of 3.
// */
// if (dot == NULL || *(dot + 1) == '\0') {
// lname = strlen(src);
// lnname = (lname > 30) ? 30 : lname;
// lext = lnext = 0;
// } else {
// lext = strlen(dot + 1);
// lname = strlen(src) - lext - 1;
// lnext = (strlen(src) > 31 && lext > 3)
// ? (lname < 27 ? 30 - lname : 3) : lext;
// lnname = (strlen(src) > 31) ? 30 - lnext : lname;
// }
//
// if (lnname == 0 && lnext == 0) {
// return;
// }
//
// pos = 0;
// /* Convert up to lnname characters of the filename. */
// for (i = 0; i < lnname; i++) {
// char c = toupper(src[i]);
// src[pos++] = valid_d_char(c) ? c : '_';
// }
// src[pos++] = '.';
// /* Convert up to lnext characters of the extension, if any. */
// for (i = 0; i < lnext; i++) {
// char c = toupper(src[lname + 1 + i]);
// src[pos++] = valid_d_char(c) ? c : '_';
// }
// src[pos] = '\0';
//}
int str2d_char(const char *icharset, const char *input, char **output)
{
int ret;
char *ascii;
size_t len, i;
if (output == NULL) {
return ISO_MEM_ERROR;
}
/** allow NULL input */
if (input == NULL) {
*output = NULL;
return 0;
}
/* this checks for NULL parameters */
ret = str2ascii(icharset, input, &ascii);
if (ret < 0) {
*output = NULL;
return ret;
}
len = strlen(ascii);
for (i = 0; i < len; ++i) {
char c = toupper(ascii[i]);
ascii[i] = valid_d_char(c) ? c : '_';
}
*output = ascii;
return ISO_SUCCESS;
}
int str2a_char(const char *icharset, const char *input, char **output)
{
int ret;
char *ascii;
size_t len, i;
if (output == NULL) {
return ISO_MEM_ERROR;
}
/** allow NULL input */
if (input == NULL) {
*output = NULL;
return 0;
}
/* this checks for NULL parameters */
ret = str2ascii(icharset, input, &ascii);
if (ret < 0) {
*output = NULL;
return ret;
}
len = strlen(ascii);
for (i = 0; i < len; ++i) {
char c = toupper(ascii[i]);
ascii[i] = valid_a_char(c) ? c : '_';
}
*output = ascii;
return ISO_SUCCESS;
}
void iso_lsb(uint8_t *buf, uint32_t num, int bytes)
{
int i;
for (i = 0; i < bytes; ++i)
buf[i] = (num >> (8 * i)) & 0xff;
}
void iso_msb(uint8_t *buf, uint32_t num, int bytes)
{
int i;
for (i = 0; i < bytes; ++i)
buf[bytes - 1 - i] = (num >> (8 * i)) & 0xff;
}
void iso_bb(uint8_t *buf, uint32_t num, int bytes)
{
iso_lsb(buf, num, bytes);
iso_msb(buf+bytes, num, bytes);
}
void iso_datetime_7(unsigned char *buf, time_t t)
{
static int tzsetup = 0;
int tzoffset;
struct tm tm;
if (!tzsetup) {
tzset();
tzsetup = 1;
}
localtime_r(&t, &tm);
buf[0] = tm.tm_year;
buf[1] = tm.tm_mon + 1;
buf[2] = tm.tm_mday;
buf[3] = tm.tm_hour;
buf[4] = tm.tm_min;
buf[5] = tm.tm_sec;
#ifdef HAVE_TM_GMTOFF
tzoffset = tm.tm_gmtoff / 60 / 15;
#else
tzoffset = timezone / 60 / 15;
#endif
if (tzoffset > 52)
tzoffset -= 101;
buf[6] = tzoffset;
}
void iso_datetime_17(unsigned char *buf, time_t t)
{
static int tzsetup = 0;
static int tzoffset;
struct tm tm;
if (t == (time_t) - 1) {
/* unspecified time */
memset(buf, '0', 16);
buf[16] = 0;
} else {
if (!tzsetup) {
tzset();
tzsetup = 1;
}
localtime_r(&t, &tm);
sprintf((char*)&buf[0], "%04d", tm.tm_year + 1900);
sprintf((char*)&buf[4], "%02d", tm.tm_mon + 1);
sprintf((char*)&buf[6], "%02d", tm.tm_mday);
sprintf((char*)&buf[8], "%02d", tm.tm_hour);
sprintf((char*)&buf[10], "%02d", tm.tm_min);
sprintf((char*)&buf[12], "%02d", MIN(59, tm.tm_sec));
memcpy(&buf[14], "00", 2);
#ifdef HAVE_TM_GMTOFF
tzoffset = tm.tm_gmtoff / 60 / 15;
#else
tzoffset = timezone / 60 / 15;
#endif
if (tzoffset > 52)
tzoffset -= 101;
buf[16] = tzoffset;
}
}
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