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1 | /* |
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2 | $Id: Unicode.xs,v 1.3 2002/04/20 23:43:47 dankogai Exp dankogai $ |
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3 | */ |
4 | |
5 | #define PERL_NO_GET_CONTEXT |
6 | #include "EXTERN.h" |
7 | #include "perl.h" |
8 | #include "XSUB.h" |
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9 | #define U8 U8 |
10 | #include "../Encode/encode.h" |
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11 | |
12 | #define FBCHAR 0xFFFd |
13 | #define BOM_BE 0xFeFF |
14 | #define BOM16LE 0xFFFe |
15 | #define BOM32LE 0xFFFe0000 |
16 | #define issurrogate(x) (0xD800 <= (x) && (x) <= 0xDFFF ) |
17 | #define isHiSurrogate(x) (0xD800 <= (x) && (x) < 0xDC00 ) |
18 | #define isLoSurrogate(x) (0xDC00 <= (x) && (x) <= 0xDFFF ) |
19 | #define invalid_ucs2(x) ( issurrogate(x) || 0xFFFF < (x) ) |
20 | |
21 | static UV |
22 | enc_unpack(pTHX_ U8 **sp,U8 *e,STRLEN size,U8 endian) |
23 | { |
24 | U8 *s = *sp; |
25 | UV v = 0; |
26 | if (s+size > e) { |
27 | croak("Partial character %c",(char) endian); |
28 | } |
29 | switch(endian) { |
30 | case 'N': |
31 | v = *s++; |
32 | v = (v << 8) | *s++; |
33 | case 'n': |
34 | v = (v << 8) | *s++; |
35 | v = (v << 8) | *s++; |
36 | break; |
37 | case 'V': |
38 | case 'v': |
39 | v |= *s++; |
40 | v |= (*s++ << 8); |
41 | if (endian == 'v') |
42 | break; |
43 | v |= (*s++ << 16); |
44 | v |= (*s++ << 24); |
45 | break; |
46 | default: |
47 | croak("Unknown endian %c",(char) endian); |
48 | break; |
49 | } |
50 | *sp = s; |
51 | return v; |
52 | } |
53 | |
54 | void |
55 | enc_pack(pTHX_ SV *result,STRLEN size,U8 endian,UV value) |
56 | { |
57 | U8 *d = (U8 *)SvGROW(result,SvCUR(result)+size); |
58 | switch(endian) { |
59 | case 'v': |
60 | case 'V': |
61 | d += SvCUR(result); |
62 | SvCUR_set(result,SvCUR(result)+size); |
63 | while (size--) { |
64 | *d++ = value & 0xFF; |
65 | value >>= 8; |
66 | } |
67 | break; |
68 | case 'n': |
69 | case 'N': |
70 | SvCUR_set(result,SvCUR(result)+size); |
71 | d += SvCUR(result); |
72 | while (size--) { |
73 | *--d = value & 0xFF; |
74 | value >>= 8; |
75 | } |
76 | break; |
77 | default: |
78 | croak("Unknown endian %c",(char) endian); |
79 | break; |
80 | } |
81 | } |
82 | |
83 | MODULE = Encode::Unicode PACKAGE = Encode::Unicode |
84 | |
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85 | PROTOTYPES: DISABLE |
86 | |
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87 | void |
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88 | decode_xs(obj, str, check = 0) |
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89 | SV * obj |
90 | SV * str |
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91 | IV check |
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92 | CODE: |
93 | { |
94 | int size = SvIV(*hv_fetch((HV *)SvRV(obj),"size",4,0)); |
95 | U8 endian = *((U8 *)SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"endian",6,0))); |
96 | int ucs2 = SvTRUE(*hv_fetch((HV *)SvRV(obj),"ucs2",4,0)); |
97 | SV *result = newSVpvn("",0); |
98 | STRLEN ulen; |
99 | U8 *s = (U8 *)SvPVbyte(str,ulen); |
100 | U8 *e = (U8 *)SvEND(str); |
101 | ST(0) = sv_2mortal(result); |
102 | SvUTF8_on(result); |
103 | |
104 | if (!endian && s+size <= e) { |
105 | UV bom; |
106 | endian = (size == 4) ? 'N' : 'n'; |
107 | bom = enc_unpack(aTHX_ &s,e,size,endian); |
108 | if (bom != BOM_BE) { |
109 | if (bom == BOM16LE) { |
110 | endian = 'v'; |
111 | } |
112 | else if (bom == BOM32LE) { |
113 | endian = 'V'; |
114 | } |
115 | else { |
116 | croak("%s:Unregognised BOM %"UVxf, |
117 | SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)), |
118 | bom); |
119 | } |
120 | } |
121 | #if 0 |
122 | /* Update endian for this sequence */ |
123 | hv_store((HV *)SvRV(obj),"endian",6,newSVpv((char *)&endian,1),0); |
124 | #endif |
125 | } |
126 | while (s < e && s+size <= e) { |
127 | UV ord = enc_unpack(aTHX_ &s,e,size,endian); |
128 | U8 *d; |
129 | if (size != 4 && invalid_ucs2(ord)) { |
130 | if (ucs2) { |
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131 | if (check) { |
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132 | croak("%s:no surrogates allowed %"UVxf, |
133 | SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)), |
134 | ord); |
135 | } |
136 | if (s+size <= e) { |
137 | /* skip the next one as well */ |
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138 | enc_unpack(aTHX_ &s,e,size,endian); |
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139 | } |
140 | ord = FBCHAR; |
141 | } |
142 | else { |
143 | UV lo; |
144 | if (!isHiSurrogate(ord)) { |
145 | croak("%s:Malformed HI surrogate %"UVxf, |
146 | SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)), |
147 | ord); |
148 | } |
149 | if (s+size > e) { |
150 | /* Partial character */ |
151 | s -= size; /* back up to 1st half */ |
152 | break; /* And exit loop */ |
153 | } |
154 | lo = enc_unpack(aTHX_ &s,e,size,endian); |
155 | if (!isLoSurrogate(lo)){ |
156 | croak("%s:Malformed LO surrogate %"UVxf, |
157 | SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0)), |
158 | ord); |
159 | } |
160 | ord = 0x10000 + ((ord - 0xD800) << 10) + (lo - 0xDC00); |
161 | } |
162 | } |
163 | d = (U8 *) SvGROW(result,SvCUR(result)+UTF8_MAXLEN+1); |
164 | d = uvuni_to_utf8_flags(d+SvCUR(result), ord, 0); |
165 | SvCUR_set(result,d - (U8 *)SvPVX(result)); |
166 | } |
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167 | if (s < e) { |
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168 | Perl_warner(aTHX_ packWARN(WARN_UTF8),"%s:Partial character", |
169 | SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0))); |
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170 | } |
171 | if (check && !(check & ENCODE_LEAVE_SRC)){ |
172 | if (s < e) { |
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173 | Move(s,SvPVX(str),e-s,U8); |
174 | SvCUR_set(str,(e-s)); |
175 | } |
176 | else { |
177 | SvCUR_set(str,0); |
178 | } |
179 | *SvEND(str) = '\0'; |
180 | } |
181 | XSRETURN(1); |
182 | } |
183 | |
184 | void |
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185 | encode_xs(obj, utf8, check = 0) |
186 | SV * obj |
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187 | SV * utf8 |
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188 | IV check |
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189 | CODE: |
190 | { |
191 | int size = SvIV(*hv_fetch((HV *)SvRV(obj),"size",4,0)); |
192 | U8 endian = *((U8 *)SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"endian",6,0))); |
193 | int ucs2 = SvTRUE(*hv_fetch((HV *)SvRV(obj),"ucs2",4,0)); |
194 | SV *result = newSVpvn("",0); |
195 | STRLEN ulen; |
196 | U8 *s = (U8 *)SvPVutf8(utf8,ulen); |
197 | U8 *e = (U8 *)SvEND(utf8); |
198 | ST(0) = sv_2mortal(result); |
199 | if (!endian) { |
200 | endian = (size == 4) ? 'N' : 'n'; |
201 | enc_pack(aTHX_ result,size,endian,BOM_BE); |
202 | #if 0 |
203 | /* Update endian for this sequence */ |
204 | hv_store((HV *)SvRV(obj),"endian",6,newSVpv((char *)&endian,1),0); |
205 | #endif |
206 | } |
207 | while (s < e && s+UTF8SKIP(s) <= e) { |
208 | STRLEN len; |
209 | UV ord = utf8n_to_uvuni(s, e-s, &len, 0); |
210 | s += len; |
211 | if (size != 4 && invalid_ucs2(ord)) { |
212 | if (!issurrogate(ord)){ |
213 | if (ucs2) { |
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214 | if (check) { |
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215 | croak("%s:code point \"\\x{"UVxf"}\" too high", |
216 | SvPV_nolen( |
217 | *hv_fetch((HV *)SvRV(obj),"Name",4,0)) |
218 | ,ord); |
219 | } |
220 | enc_pack(aTHX_ result,size,endian,FBCHAR); |
221 | }else{ |
222 | UV hi = ((ord - 0x10000) >> 10) + 0xD800; |
223 | UV lo = ((ord - 0x10000) & 0x3FF) + 0xDC00; |
224 | enc_pack(aTHX_ result,size,endian,hi); |
225 | enc_pack(aTHX_ result,size,endian,lo); |
226 | } |
227 | } |
228 | else { |
229 | /* not supposed to happen */ |
230 | enc_pack(aTHX_ result,size,endian,FBCHAR); |
231 | } |
232 | } |
233 | else { |
234 | enc_pack(aTHX_ result,size,endian,ord); |
235 | } |
236 | } |
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237 | if (s < e) { |
238 | Perl_warner(aTHX_ packWARN(WARN_UTF8),"%s:Partial character", |
239 | SvPV_nolen(*hv_fetch((HV *)SvRV(obj),"Name",4,0))); |
240 | } |
241 | if (check && !(check & ENCODE_LEAVE_SRC)){ |
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242 | if (s < e) { |
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243 | Move(s,SvPVX(utf8),e-s,U8); |
244 | SvCUR_set(utf8,(e-s)); |
245 | } |
246 | else { |
247 | SvCUR_set(utf8,0); |
248 | } |
249 | *SvEND(utf8) = '\0'; |
250 | } |
251 | XSRETURN(1); |
252 | } |
253 | |