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Diffstat (limited to 'source3/lib/iconv.c')
-rw-r--r-- | source3/lib/iconv.c | 346 |
1 files changed, 346 insertions, 0 deletions
diff --git a/source3/lib/iconv.c b/source3/lib/iconv.c new file mode 100644 index 0000000000..a22c84997d --- /dev/null +++ b/source3/lib/iconv.c @@ -0,0 +1,346 @@ +/* + Unix SMB/Netbios implementation. + Version 3.0 + minimal iconv implementation + Copyright (C) Andrew Tridgell 2001 + + 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" + +static size_t ascii_pull(char **, size_t *, char **, size_t *); +static size_t ascii_push(char **, size_t *, char **, size_t *); +static size_t weird_pull(char **, size_t *, char **, size_t *); +static size_t weird_push(char **, size_t *, char **, size_t *); +static size_t iconv_copy(char **, size_t *, char **, size_t *); + +/* + for each charset we have a function that pulls from that charset to + a ucs2 buffer, and a function that pushes to a ucs2 buffer +*/ +static struct { + char *name; + size_t (*pull)(char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft); + size_t (*push)(char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft); +} charsets[] = { + {"UCS2", iconv_copy, iconv_copy}, + {"ASCII", ascii_pull, ascii_push}, + {"WEIRD", weird_pull, weird_push}, + {NULL, NULL, NULL} +}; + +/* + 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, + char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + char cvtbuf[2048]; + char *bufp = cvtbuf; + size_t bufsize; + +#ifdef HAVE_NATIVE_ICONV + if (cd->cd) { + return iconv(cd->cd, inbuf, inbytesleft, outbuf, outbytesleft); + } +#endif + + if (!inbuf || ! *inbuf || !outbuf || ! *outbuf) return 0; + + /* in most cases we can go direct */ + if (cd->direct) { + return 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(inbuf, inbytesleft, &bufp, &bufsize) == -1 && + errno != E2BIG) return -1; + + bufp = cvtbuf; + bufsize = sizeof(cvtbuf) - bufsize; + if (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; + int from, to; +#ifdef HAVE_NATIVE_ICONV + iconv_t cd = NULL; +#endif + + for (from=0; charsets[from].name; from++) { + if (strcasecmp(charsets[from].name, fromcode) == 0) break; + } + for (to=0; charsets[to].name; to++) { + if (strcasecmp(charsets[to].name, tocode) == 0) break; + } + + if (!charsets[from].name || !charsets[to].name) { +#ifdef HAVE_NATIVE_ICONV + cd = iconv_open(tocode, fromcode); + if (!cd) +#endif + { + errno = EINVAL; + return (smb_iconv_t)-1; + } + } + + ret = (smb_iconv_t)malloc(sizeof(*ret)); + if (!ret) { + errno = ENOMEM; + return (smb_iconv_t)-1; + } + memset(ret, 0, sizeof(*ret)); + +#ifdef HAVE_NATIVE_ICONV + /* see if we wil be using the native iconv */ + if (cd) { + ret->cd = cd; + return ret; + } +#endif + + /* check for the simplest null conversion */ + if (from == to) { + ret->direct = iconv_copy; + return ret; + } + + /* check for conversion to/from ucs2 */ + if (from == 0) { + ret->direct = charsets[to].push; + return ret; + } + if (to == 0) { + ret->direct = charsets[from].pull; + return ret; + } + + /* the general case has to go via a buffer */ + ret->pull = charsets[from].pull; + ret->push = charsets[to].push; + return ret; +} + +/* + simple iconv_close() wrapper +*/ +int smb_iconv_close (smb_iconv_t cd) +{ +#ifdef HAVE_NATIVE_ICONV + if (cd->cd) { + iconv_close(cd->cd); + } +#endif + memset(cd, 0, sizeof(*cd)); + 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(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(char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + int ir_count=0; + + while (*inbytesleft >= 2 && *outbytesleft >= 1) { + (*outbuf)[0] = (*inbuf)[0]; + 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; +} + + +/* the "weird" character set is very useful for testing multi-byte + support and finding bugs. Don't use on a production system! +*/ +static struct { + char from; + char *to; + int len; +} weird_table[] = { + {'q', "^q^", 3}, + {'Q', "^Q^", 3}, + {'x', "\\.q\\.", 5}, + {'X', "\\.Z\\.", 5}, + {0, NULL} +}; + +static size_t weird_pull(char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + while (*inbytesleft >= 1 && *outbytesleft >= 2) { + int i; + for (i=0;weird_table[i].from;i++) { + if (strncmp((*inbuf), + weird_table[i].to, + weird_table[i].len) == 0) { + if (*inbytesleft < weird_table[i].len) { + DEBUG(0,("ERROR: truncated weird string\n")); + smb_panic(__FUNCTION__); + + } else { + (*outbuf)[0] = weird_table[i].from; + (*outbuf)[1] = 0; + (*inbytesleft) -= weird_table[i].len; + (*outbytesleft) -= 2; + (*inbuf) += weird_table[i].len; + (*outbuf) += 2; + goto next; + } + } + } + (*outbuf)[0] = (*inbuf)[0]; + (*outbuf)[1] = 0; + (*inbytesleft) -= 1; + (*outbytesleft) -= 2; + (*inbuf) += 1; + (*outbuf) += 2; + next: + } + + if (*inbytesleft > 0) { + errno = E2BIG; + return -1; + } + + return 0; +} + +static size_t weird_push(char **inbuf, size_t *inbytesleft, + char **outbuf, size_t *outbytesleft) +{ + int ir_count=0; + + while (*inbytesleft >= 2 && *outbytesleft >= 1) { + int i; + for (i=0;weird_table[i].from;i++) { + if ((*inbuf)[0] == weird_table[i].from && + (*inbuf)[1] == 0) { + if (*outbytesleft < weird_table[i].len) { + DEBUG(0,("No room for weird character\n")); + smb_panic(__FUNCTION__); + } else { + memcpy(*outbuf, weird_table[i].to, + weird_table[i].len); + (*inbytesleft) -= 2; + (*outbytesleft) -= weird_table[i].len; + (*inbuf) += 2; + (*outbuf) += weird_table[i].len; + goto next; + } + } + } + (*outbuf)[0] = (*inbuf)[0]; + if ((*inbuf)[1]) ir_count++; + (*inbytesleft) -= 2; + (*outbytesleft) -= 1; + (*inbuf) += 2; + (*outbuf) += 1; + next: + } + + if (*inbytesleft == 1) { + errno = EINVAL; + return -1; + } + + if (*inbytesleft > 1) { + errno = E2BIG; + return -1; + } + + return ir_count; +} + +static size_t iconv_copy(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; +} |