From ef2e26c91b80556af033d3335e55f5dfa6fff31d Mon Sep 17 00:00:00 2001 From: Andrew Tridgell Date: Wed, 13 Aug 2003 01:53:07 +0000 Subject: first public release of samba4 code (This used to be commit b0510b5428b3461aeb9bbe3cc95f62fc73e2b97f) --- source4/lib/iconv.c | 526 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 526 insertions(+) create mode 100644 source4/lib/iconv.c (limited to 'source4/lib/iconv.c') diff --git a/source4/lib/iconv.c b/source4/lib/iconv.c new file mode 100644 index 0000000000..8f85e29c2e --- /dev/null +++ b/source4/lib/iconv.c @@ -0,0 +1,526 @@ +/* + Unix SMB/CIFS implementation. + minimal iconv implementation + Copyright (C) Andrew Tridgell 2001 + Copyright (C) Jelmer Vernooij 2002 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + + +/** + * @file + * + * @brief Samba wrapper/stub for iconv character set conversion. + * + * iconv is the XPG2 interface for converting between character + * encodings. This file provides a Samba wrapper around it, and also + * a simple reimplementation that is used if the system does not + * implement iconv. + * + * Samba only works with encodings that are supersets of ASCII: ascii + * characters like whitespace can be tested for directly, multibyte + * sequences start with a byte with the high bit set, and strings are + * terminated by a nul byte. + * + * Note that the only function provided by iconv is conversion between + * characters. It doesn't directly support operations like + * uppercasing or comparison. We have to convert to UCS-2 and compare + * there. + * + * @sa Samba Developers Guide + **/ + +static size_t ascii_pull(void *,const char **, size_t *, char **, size_t *); +static size_t ascii_push(void *,const char **, size_t *, char **, size_t *); +static size_t utf8_pull(void *,const char **, size_t *, char **, size_t *); +static size_t utf8_push(void *,const char **, size_t *, char **, size_t *); +static size_t ucs2hex_pull(void *,const char **, size_t *, char **, size_t *); +static size_t ucs2hex_push(void *,const char **, size_t *, char **, size_t *); +static size_t iconv_copy(void *,const char **, size_t *, char **, size_t *); + +static struct charset_functions builtin_functions[] = { + {"UCS-2LE", iconv_copy, iconv_copy}, + {"UTF8", utf8_pull, utf8_push}, + {"ASCII", ascii_pull, ascii_push}, + {"UCS2-HEX", ucs2hex_pull, ucs2hex_push}, + {NULL, NULL, NULL} +}; + +static struct charset_functions *charsets = NULL; + +BOOL smb_register_charset(struct charset_functions *funcs) +{ + struct charset_functions *c = charsets; + + DEBUG(5, ("Attempting to register new charset %s\n", funcs->name)); + /* Check whether we already have this charset... */ + while(c) { + if(!strcasecmp(c->name, funcs->name)){ + DEBUG(2, ("Duplicate charset %s, not registering\n", funcs->name)); + return False; + } + c = c->next; + } + + funcs->next = funcs->prev = NULL; + DEBUG(5, ("Registered charset %s\n", funcs->name)); + DLIST_ADD(charsets, funcs); + return True; +} + +static void lazy_initialize_iconv(void) +{ + static BOOL initialized = False; + int i; + + if (!initialized) { + initialized = True; + for(i = 0; builtin_functions[i].name; i++) + smb_register_charset(&builtin_functions[i]); + } +} + +#ifdef HAVE_NATIVE_ICONV +/* if there was an error then reset the internal state, + this ensures that we don't have a shift state remaining for + character sets like SJIS */ +static size_t sys_iconv(void *cd, + const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + size_t ret = iconv((iconv_t)cd, + inbuf, inbytesleft, + outbuf, outbytesleft); + if (ret == (size_t)-1) iconv(cd, NULL, NULL, NULL, NULL); + return ret; +} +#endif + +/** + * This is a simple portable iconv() implementaion. + * + * It only knows about a very small number of character sets - just + * enough that Samba works on systems that don't have iconv. + **/ +size_t smb_iconv(smb_iconv_t cd, + const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + char cvtbuf[2048]; + char *bufp = cvtbuf; + size_t bufsize; + + /* in many cases we can go direct */ + if (cd->direct) { + return cd->direct(cd->cd_direct, + inbuf, inbytesleft, outbuf, outbytesleft); + } + + + /* otherwise we have to do it chunks at a time */ + while (*inbytesleft > 0) { + bufp = cvtbuf; + bufsize = sizeof(cvtbuf); + + if (cd->pull(cd->cd_pull, + inbuf, inbytesleft, &bufp, &bufsize) == -1 + && errno != E2BIG) return -1; + + bufp = cvtbuf; + bufsize = sizeof(cvtbuf) - bufsize; + + if (cd->push(cd->cd_push, + &bufp, &bufsize, + outbuf, outbytesleft) == -1) return -1; + } + + return 0; +} + +/* + simple iconv_open() wrapper + */ +smb_iconv_t smb_iconv_open(const char *tocode, const char *fromcode) +{ + smb_iconv_t ret; + struct charset_functions *from, *to; + + lazy_initialize_iconv(); + from = charsets; + to = charsets; + + ret = (smb_iconv_t)malloc(sizeof(*ret)); + if (!ret) { + errno = ENOMEM; + return (smb_iconv_t)-1; + } + memset(ret, 0, sizeof(*ret)); + + ret->from_name = strdup(fromcode); + ret->to_name = strdup(tocode); + + /* check for the simplest null conversion */ + if (strcmp(fromcode, tocode) == 0) { + ret->direct = iconv_copy; + return ret; + } + + while (from) { + if (strcasecmp(from->name, fromcode) == 0) break; + from = from->next; + } + + while (to) { + if (strcasecmp(to->name, tocode) == 0) break; + to = to->next; + } + +#ifdef HAVE_NATIVE_ICONV + if (!from) { + ret->pull = sys_iconv; + ret->cd_pull = iconv_open("UCS-2LE", fromcode); + if (ret->cd_pull == (iconv_t)-1) goto failed; + } + + if (!to) { + ret->push = sys_iconv; + ret->cd_push = iconv_open(tocode, "UCS-2LE"); + if (ret->cd_push == (iconv_t)-1) goto failed; + } +#else + if (!from || !to) { + goto failed; + } +#endif + + /* check for conversion to/from ucs2 */ + if (strcasecmp(fromcode, "UCS-2LE") == 0 && to) { + ret->direct = to->push; + return ret; + } + if (strcasecmp(tocode, "UCS-2LE") == 0 && from) { + ret->direct = from->pull; + return ret; + } + +#ifdef HAVE_NATIVE_ICONV + if (strcasecmp(fromcode, "UCS-2LE") == 0) { + ret->direct = sys_iconv; + ret->cd_direct = ret->cd_push; + ret->cd_push = NULL; + return ret; + } + if (strcasecmp(tocode, "UCS-2LE") == 0) { + ret->direct = sys_iconv; + ret->cd_direct = ret->cd_pull; + ret->cd_pull = NULL; + return ret; + } +#endif + + /* the general case has to go via a buffer */ + if (!ret->pull) ret->pull = from->pull; + if (!ret->push) ret->push = to->push; + return ret; + +failed: + SAFE_FREE(ret); + errno = EINVAL; + return (smb_iconv_t)-1; +} + +/* + simple iconv_close() wrapper +*/ +int smb_iconv_close (smb_iconv_t cd) +{ +#ifdef HAVE_NATIVE_ICONV + if (cd->cd_direct) iconv_close((iconv_t)cd->cd_direct); + if (cd->cd_pull) iconv_close((iconv_t)cd->cd_pull); + if (cd->cd_push) iconv_close((iconv_t)cd->cd_push); +#endif + + SAFE_FREE(cd->from_name); + SAFE_FREE(cd->to_name); + + memset(cd, 0, sizeof(*cd)); + SAFE_FREE(cd); + return 0; +} + + +/********************************************************************** + the following functions implement the builtin character sets in Samba + and also the "test" character sets that are designed to test + multi-byte character set support for english users +***********************************************************************/ +static size_t ascii_pull(void *cd, const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + while (*inbytesleft >= 1 && *outbytesleft >= 2) { + (*outbuf)[0] = (*inbuf)[0]; + (*outbuf)[1] = 0; + (*inbytesleft) -= 1; + (*outbytesleft) -= 2; + (*inbuf) += 1; + (*outbuf) += 2; + } + + if (*inbytesleft > 0) { + errno = E2BIG; + return -1; + } + + return 0; +} + +static size_t ascii_push(void *cd, const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + int ir_count=0; + + while (*inbytesleft >= 2 && *outbytesleft >= 1) { + (*outbuf)[0] = (*inbuf)[0] & 0x7F; + if ((*inbuf)[1]) ir_count++; + (*inbytesleft) -= 2; + (*outbytesleft) -= 1; + (*inbuf) += 2; + (*outbuf) += 1; + } + + if (*inbytesleft == 1) { + errno = EINVAL; + return -1; + } + + if (*inbytesleft > 1) { + errno = E2BIG; + return -1; + } + + return ir_count; +} + + +static size_t ucs2hex_pull(void *cd, const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + while (*inbytesleft >= 1 && *outbytesleft >= 2) { + unsigned v; + + if ((*inbuf)[0] != '@') { + /* seven bit ascii case */ + (*outbuf)[0] = (*inbuf)[0]; + (*outbuf)[1] = 0; + (*inbytesleft) -= 1; + (*outbytesleft) -= 2; + (*inbuf) += 1; + (*outbuf) += 2; + continue; + } + /* it's a hex character */ + if (*inbytesleft < 5) { + errno = EINVAL; + return -1; + } + + if (sscanf(&(*inbuf)[1], "%04x", &v) != 1) { + errno = EILSEQ; + return -1; + } + + (*outbuf)[0] = v&0xff; + (*outbuf)[1] = v>>8; + (*inbytesleft) -= 5; + (*outbytesleft) -= 2; + (*inbuf) += 5; + (*outbuf) += 2; + } + + if (*inbytesleft > 0) { + errno = E2BIG; + return -1; + } + + return 0; +} + +static size_t ucs2hex_push(void *cd, const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + while (*inbytesleft >= 2 && *outbytesleft >= 1) { + char buf[6]; + + if ((*inbuf)[1] == 0 && + ((*inbuf)[0] & 0x80) == 0 && + (*inbuf)[0] != '@') { + (*outbuf)[0] = (*inbuf)[0]; + (*inbytesleft) -= 2; + (*outbytesleft) -= 1; + (*inbuf) += 2; + (*outbuf) += 1; + continue; + } + if (*outbytesleft < 5) { + errno = E2BIG; + return -1; + } + snprintf(buf, 6, "@%04x", SVAL(*inbuf, 0)); + memcpy(*outbuf, buf, 5); + (*inbytesleft) -= 2; + (*outbytesleft) -= 5; + (*inbuf) += 2; + (*outbuf) += 5; + } + + if (*inbytesleft == 1) { + errno = EINVAL; + return -1; + } + + if (*inbytesleft > 1) { + errno = E2BIG; + return -1; + } + + return 0; +} + + +static size_t iconv_copy(void *cd, const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + int n; + + n = MIN(*inbytesleft, *outbytesleft); + + memmove(*outbuf, *inbuf, n); + + (*inbytesleft) -= n; + (*outbytesleft) -= n; + (*inbuf) += n; + (*outbuf) += n; + + if (*inbytesleft > 0) { + errno = E2BIG; + return -1; + } + + return 0; +} + +static size_t utf8_pull(void *cd, const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + while (*inbytesleft >= 1 && *outbytesleft >= 2) { + const unsigned char *c = (const unsigned char *)*inbuf; + unsigned char *uc = (unsigned char *)*outbuf; + int len = 1; + + if ((c[0] & 0x80) == 0) { + uc[0] = c[0]; + uc[1] = 0; + } else if ((c[0] & 0xf0) == 0xe0) { + if (*inbytesleft < 3) { + DEBUG(0,("short utf8 char\n")); + goto badseq; + } + uc[1] = ((c[0]&0xF)<<4) | ((c[1]>>2)&0xF); + uc[0] = (c[1]<<6) | (c[2]&0x3f); + len = 3; + } else if ((c[0] & 0xe0) == 0xc0) { + if (*inbytesleft < 2) { + DEBUG(0,("short utf8 char\n")); + goto badseq; + } + uc[1] = (c[0]>>2) & 0x7; + uc[0] = (c[0]<<6) | (c[1]&0x3f); + len = 2; + } + + (*inbuf) += len; + (*inbytesleft) -= len; + (*outbytesleft) -= 2; + (*outbuf) += 2; + } + + if (*inbytesleft > 0) { + errno = E2BIG; + return -1; + } + + return 0; + +badseq: + errno = EINVAL; + return -1; +} + +static size_t utf8_push(void *cd, const char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + while (*inbytesleft >= 2 && *outbytesleft >= 1) { + unsigned char *c = (unsigned char *)*outbuf; + const unsigned char *uc = (const unsigned char *)*inbuf; + int len=1; + + if (uc[1] & 0xf8) { + if (*outbytesleft < 3) { + DEBUG(0,("short utf8 write\n")); + goto toobig; + } + c[0] = 0xe0 | (uc[1]>>4); + c[1] = 0x80 | ((uc[1]&0xF)<<2) | (uc[0]>>6); + c[2] = 0x80 | (uc[0]&0x3f); + len = 3; + } else if (uc[1] | (uc[0] & 0x80)) { + if (*outbytesleft < 2) { + DEBUG(0,("short utf8 write\n")); + goto toobig; + } + c[0] = 0xc0 | (uc[1]<<2) | (uc[0]>>6); + c[1] = 0x80 | (uc[0]&0x3f); + len = 2; + } else { + c[0] = uc[0]; + } + + + (*inbytesleft) -= 2; + (*outbytesleft) -= len; + (*inbuf) += 2; + (*outbuf) += len; + } + + if (*inbytesleft == 1) { + errno = EINVAL; + return -1; + } + + if (*inbytesleft > 1) { + errno = E2BIG; + return -1; + } + + return 0; + +toobig: + errno = E2BIG; + return -1; +} + -- cgit