diff options
Diffstat (limited to 'src/UTF8String.c')
| -rw-r--r-- | src/UTF8String.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/UTF8String.c b/src/UTF8String.c new file mode 100644 index 0000000..e3f7388 --- /dev/null +++ b/src/UTF8String.c @@ -0,0 +1,183 @@ +/*- + * Copyright (c) 2003, 2004, 2006 Lev Walkin <vlm@lionet.info>. + * All rights reserved. + * Redistribution and modifications are permitted subject to BSD license. + */ +#include <asn_internal.h> +#include <UTF8String.h> + +/* + * UTF8String basic type description. + */ +static ber_tlv_tag_t asn_DEF_UTF8String_tags[] = { + (ASN_TAG_CLASS_UNIVERSAL | (12 << 2)), /* [UNIVERSAL 12] IMPLICIT ...*/ + (ASN_TAG_CLASS_UNIVERSAL | (4 << 2)), /* ... OCTET STRING */ +}; +asn_TYPE_descriptor_t asn_DEF_UTF8String = { + "UTF8String", + "UTF8String", + OCTET_STRING_free, + UTF8String_print, + UTF8String_constraint, /* Check for invalid codes, etc. */ + OCTET_STRING_decode_ber, /* Implemented in terms of OCTET STRING */ + OCTET_STRING_encode_der, + OCTET_STRING_decode_xer_utf8, + OCTET_STRING_encode_xer_utf8, + 0, 0, + 0, /* Use generic outmost tag fetcher */ + asn_DEF_UTF8String_tags, + sizeof(asn_DEF_UTF8String_tags) + / sizeof(asn_DEF_UTF8String_tags[0]) - 1, + asn_DEF_UTF8String_tags, + sizeof(asn_DEF_UTF8String_tags) + / sizeof(asn_DEF_UTF8String_tags[0]), + 0, /* No PER visible constraints */ + 0, 0, /* No members */ + 0 /* No specifics */ +}; + +/* + * This is the table of length expectations. + * The second half of this table is only applicable to the long sequences. + */ +static int UTF8String_ht[2][16] = { + { /* 0x0 ... 0x7 */ + /* 0000..0111 */ + 1, 1, 1, 1, 1, 1, 1, 1, + /* 1000..1011(0), 1100..1101(2), 1110(3), 1111(-1) */ + 0, 0, 0, 0, 2, 2, 3, -1 }, + { /* 0xF0 .. 0xF7 */ + /* 11110000..11110111 */ + 4, 4, 4, 4, 4, 4, 4, 4, + 5, 5, 5, 5, 6, 6, -1, -1 } +}; +static int32_t UTF8String_mv[7] = { 0, 0, + 0x00000080, + 0x00000800, + 0x00010000, + 0x00200000, + 0x04000000 +}; + +/* Internal aliases for return codes */ +#define U8E_TRUNC -1 /* UTF-8 sequence truncated */ +#define U8E_ILLSTART -2 /* Illegal UTF-8 sequence start */ +#define U8E_NOTCONT -3 /* Continuation expectation failed */ +#define U8E_NOTMIN -4 /* Not minimal length encoding */ +#define U8E_EINVAL -5 /* Invalid arguments */ + +int +UTF8String_constraint(asn_TYPE_descriptor_t *td, const void *sptr, + asn_app_constraint_failed_f *ctfailcb, void *app_key) { + ssize_t len = UTF8String_length((const UTF8String_t *)sptr); + switch(len) { + case U8E_EINVAL: + _ASN_CTFAIL(app_key, td, + "%s: value not given", td->name); + break; + case U8E_TRUNC: + _ASN_CTFAIL(app_key, td, + "%s: truncated UTF-8 sequence (%s:%d)", + td->name, __FILE__, __LINE__); + break; + case U8E_ILLSTART: + _ASN_CTFAIL(app_key, td, + "%s: UTF-8 illegal start of encoding (%s:%d)", + td->name, __FILE__, __LINE__); + break; + case U8E_NOTCONT: + _ASN_CTFAIL(app_key, td, + "%s: UTF-8 not continuation (%s:%d)", + td->name, __FILE__, __LINE__); + break; + case U8E_NOTMIN: + _ASN_CTFAIL(app_key, td, + "%s: UTF-8 not minimal sequence (%s:%d)", + td->name, __FILE__, __LINE__); + break; + } + return (len < 0) ? -1 : 0; +} + +static ssize_t +UTF8String__process(const UTF8String_t *st, uint32_t *dst, size_t dstlen) { + size_t length; + uint8_t *buf = st->buf; + uint8_t *end = buf + st->size; + uint32_t *dstend = dst + dstlen; + + for(length = 0; buf < end; length++) { + int ch = *buf; + uint8_t *cend; + int32_t value; + int want; + + /* Compute the sequence length */ + want = UTF8String_ht[0][ch >> 4]; + switch(want) { + case -1: + /* Second half of the table, long sequence */ + want = UTF8String_ht[1][ch & 0x0F]; + if(want != -1) break; + /* Fall through */ + case 0: + return U8E_ILLSTART; + } + + /* assert(want >= 1 && want <= 6) */ + + /* Check character sequence length */ + if(buf + want > end) return U8E_TRUNC; + + value = ch & (0xff >> want); + cend = buf + want; + for(buf++; buf < cend; buf++) { + ch = *buf; + if(ch < 0x80 || ch > 0xbf) return U8E_NOTCONT; + value = (value << 6) | (ch & 0x3F); + } + if(value < UTF8String_mv[want]) + return U8E_NOTMIN; + if(dst < dstend) + *dst++ = value; /* Record value */ + } + + if(dst < dstend) *dst = 0; /* zero-terminate */ + + return length; +} + + +ssize_t +UTF8String_length(const UTF8String_t *st) { + if(st && st->buf) { + return UTF8String__process(st, 0, 0); + } else { + return U8E_EINVAL; + } +} + +size_t +UTF8String_to_wcs(const UTF8String_t *st, uint32_t *dst, size_t dstlen) { + if(st && st->buf) { + ssize_t ret = UTF8String__process(st, dst, dstlen); + return (ret < 0) ? 0 : ret; + } else { + return 0; + } +} + +int +UTF8String_print(asn_TYPE_descriptor_t *td, const void *sptr, int ilevel, + asn_app_consume_bytes_f *cb, void *app_key) { + const UTF8String_t *st = (const UTF8String_t *)sptr; + + (void)td; /* Unused argument */ + (void)ilevel; /* Unused argument */ + + if(st && st->buf) { + return (cb(st->buf, st->size, app_key) < 0) ? -1 : 0; + } else { + return (cb("<absent>", 8, app_key) < 0) ? -1 : 0; + } +} |