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00015 #include "stringStreamBuf.h"
00016 #include "pnotify.h"
00017 #include "config_express.h"
00018
00019
00020
00021
00022
00023
00024 StringStreamBuf::
00025 StringStreamBuf() {
00026 #ifdef PHAVE_IOSTREAM
00027 _buffer = (char *)PANDA_MALLOC_ARRAY(2048);
00028 char *ebuf = _buffer + 2048;
00029 char *mbuf = _buffer + 1024;
00030 setg(_buffer, mbuf, mbuf);
00031 setp(mbuf, ebuf);
00032
00033 #else
00034 allocate();
00035
00036
00037 char *b = base();
00038 char *t = ebuf();
00039 char *m = b + (t - b) / 2;
00040 setg(b, m, m);
00041 setp(b, m);
00042 #endif
00043
00044 _gpos = 0;
00045 _ppos = 0;
00046 }
00047
00048
00049
00050
00051
00052
00053 StringStreamBuf::
00054 ~StringStreamBuf() {
00055 #ifdef PHAVE_IOSTREAM
00056 PANDA_FREE_ARRAY(_buffer);
00057 #endif
00058 }
00059
00060
00061
00062
00063
00064
00065 void StringStreamBuf::
00066 clear() {
00067 _data.clear();
00068 _gpos = 0;
00069 _ppos = 0;
00070
00071 pbump(pbase() - pptr());
00072 gbump(egptr() - gptr());
00073 }
00074
00075
00076
00077
00078
00079
00080
00081
00082 size_t StringStreamBuf::
00083 read_chars(char *start, size_t length) {
00084 if (length == 0) {
00085 return 0;
00086 }
00087
00088
00089 sync();
00090
00091 if (_data.size() <= _gpos) {
00092 return 0;
00093 }
00094
00095 length = min(length, _data.size() - _gpos);
00096 memcpy(start, &_data[_gpos], length);
00097 _gpos += length;
00098 return length;
00099 }
00100
00101
00102
00103
00104
00105
00106
00107 void StringStreamBuf::
00108 write_chars(const char *start, size_t length) {
00109 if (length != 0) {
00110
00111 size_t n = egptr() - gptr();
00112 gbump(n);
00113 _gpos -= n;
00114
00115 if (_data.size() > _ppos) {
00116
00117 size_t remaining_length = _data.size() - _ppos;
00118 size_t overwrite_length = min(remaining_length, length);
00119 memcpy(&_data[_ppos], start, overwrite_length);
00120 length -= overwrite_length;
00121 _ppos += overwrite_length;
00122 start += overwrite_length;
00123 }
00124
00125 if (_data.size() < _ppos) {
00126
00127 _data.insert(_data.end(), _ppos - _data.size(), (unsigned char)0);
00128 }
00129
00130 if (length != 0) {
00131
00132 _data.insert(_data.begin() + _ppos, (const unsigned char *)start, (const unsigned char *)start + length);
00133 _ppos += length;
00134 }
00135 }
00136 }
00137
00138
00139
00140
00141
00142
00143 streampos StringStreamBuf::
00144 seekoff(streamoff off, ios_seekdir dir, ios_openmode which) {
00145 streampos result = -1;
00146
00147
00148 sync();
00149
00150 if (which & ios::in) {
00151
00152 size_t n = egptr() - gptr();
00153 gbump(n);
00154 _gpos -= n;
00155 size_t cur_pos = _gpos;
00156 size_t new_pos = cur_pos;
00157
00158
00159 switch (dir) {
00160 case ios::beg:
00161 new_pos = (size_t)off;
00162 break;
00163
00164 case ios::cur:
00165 new_pos = (size_t)((int)cur_pos + off);
00166 break;
00167
00168 case ios::end:
00169 new_pos = (size_t)((int)_data.size() + off);
00170 break;
00171
00172 default:
00173
00174 break;
00175 }
00176
00177 _gpos = new_pos;
00178 result = new_pos;
00179 }
00180
00181 if (which & ios::out) {
00182
00183 size_t n = pptr() - pbase();
00184 size_t cur_pos = _ppos + n;
00185 size_t new_pos = cur_pos;
00186
00187
00188 switch (dir) {
00189 case ios::beg:
00190 new_pos = (size_t)off;
00191 break;
00192
00193 case ios::cur:
00194 new_pos = (size_t)((int)cur_pos + off);
00195 break;
00196
00197 case ios::end:
00198 new_pos = (size_t)((int)_data.size() + off);
00199 break;
00200
00201 default:
00202
00203 break;
00204 }
00205
00206 _ppos = new_pos;
00207 result = new_pos;
00208 }
00209
00210 return result;
00211 }
00212
00213
00214
00215
00216
00217
00218
00219
00220
00221
00222
00223
00224
00225
00226
00227 streampos StringStreamBuf::
00228 seekpos(streampos pos, ios_openmode which) {
00229 return seekoff(pos, ios::beg, which);
00230 }
00231
00232
00233
00234
00235
00236
00237
00238 int StringStreamBuf::
00239 overflow(int ch) {
00240 size_t n = pptr() - pbase();
00241 if (n != 0) {
00242 write_chars(pbase(), n);
00243 pbump(-(int)n);
00244 }
00245
00246 if (ch != EOF) {
00247
00248 char c = ch;
00249 write_chars(&c, 1);
00250 }
00251
00252 return 0;
00253 }
00254
00255
00256
00257
00258
00259
00260
00261 int StringStreamBuf::
00262 sync() {
00263 size_t n = pptr() - pbase();
00264
00265 write_chars(pbase(), n);
00266 pbump(-(int)n);
00267
00268 return 0;
00269 }
00270
00271
00272
00273
00274
00275
00276
00277 int StringStreamBuf::
00278 underflow() {
00279
00280 if (gptr() >= egptr()) {
00281
00282 size_t buffer_size = egptr() - eback();
00283 gbump(-(int)buffer_size);
00284
00285 size_t num_bytes = buffer_size;
00286 size_t read_count = read_chars(gptr(), buffer_size);
00287
00288 if (read_count != num_bytes) {
00289
00290 if (read_count == 0) {
00291 gbump(num_bytes);
00292 return EOF;
00293 }
00294
00295
00296 nassertr(read_count < num_bytes, EOF);
00297 size_t delta = num_bytes - read_count;
00298 memmove(gptr() + delta, gptr(), read_count);
00299 gbump(delta);
00300 }
00301 }
00302
00303 return (unsigned char)*gptr();
00304 }
00305