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00027 #include "file.h"
00028 #include "magic.h"
00029 #include <stdarg.h>
00030 #include <stdlib.h>
00031 #include <string.h>
00032 #include <ctype.h>
00033 #if defined(HAVE_WCHAR_H)
00034 #include <wchar.h>
00035 #endif
00036 #if defined(HAVE_WCTYPE_H)
00037 #include <wctype.h>
00038 #endif
00039 #if defined(HAVE_LIMITS_H)
00040 #include <limits.h>
00041 #endif
00042 #ifndef SIZE_T_MAX
00043 #ifdef __LP64__
00044 #define SIZE_T_MAX (size_t)0xfffffffffffffffffU
00045 #else
00046 #define SIZE_T_MAX (size_t)0xffffffffU
00047 #endif
00048 #endif
00049
00050 #ifndef lint
00051 FILE_RCSID("@(#)$File: funcs.c,v 1.32 2007/05/24 17:22:27 christos Exp $")
00052 #endif
00053
00054 #ifndef HAVE_VSNPRINTF
00055 int vsnprintf(char *, size_t, const char *, va_list)
00056 ;
00057 #endif
00058
00059
00060
00061
00062 protected int
00063 file_printf(struct magic_set *ms, const char *fmt, ...)
00064 {
00065 va_list ap;
00066 size_t len, size;
00067 char *buf;
00068
00069 va_start(ap, fmt);
00070
00071 if ((len = vsnprintf(ms->o.ptr, ms->o.left, fmt, ap)) >= ms->o.left) {
00072 long diff;
00073
00074 va_end(ap);
00075 size = (ms->o.size - ms->o.left) + len + 1024;
00076 if ((buf = realloc(ms->o.buf, size)) == NULL) {
00077 file_oomem(ms, size);
00078 return -1;
00079 }
00080 diff = ms->o.ptr - ms->o.buf;
00081 ms->o.ptr = buf + diff;
00082 ms->o.buf = buf;
00083 ms->o.left = size - diff;
00084 ms->o.size = size;
00085
00086 va_start(ap, fmt);
00087 len = vsnprintf(ms->o.ptr, ms->o.left, fmt, ap);
00088 }
00089 va_end(ap);
00090 ms->o.ptr += len;
00091 ms->o.left -= len;
00092 return 0;
00093 }
00094
00095
00096
00097
00098
00099 private void
00100 file_error_core(struct magic_set *ms, int error, const char *f, va_list va,
00101 uint32_t lineno)
00102
00103 {
00104 size_t len;
00105
00106 if (ms->haderr)
00107 return;
00108 len = 0;
00109 if (lineno != 0) {
00110 (void)snprintf(ms->o.buf, ms->o.size, "line %u: ", lineno);
00111 len = strlen(ms->o.buf);
00112 }
00113 (void)vsnprintf(ms->o.buf + len, ms->o.size - len, f, va);
00114 if (error > 0) {
00115 len = strlen(ms->o.buf);
00116 (void)snprintf(ms->o.buf + len, ms->o.size - len, " (%s)",
00117 strerror(error));
00118 }
00119 ms->haderr++;
00120 ms->error = error;
00121 }
00122
00123
00124 protected void
00125 file_error(struct magic_set *ms, int error, const char *f, ...)
00126 {
00127 va_list va;
00128 va_start(va, f);
00129 file_error_core(ms, error, f, va, 0);
00130 va_end(va);
00131 }
00132
00133
00134
00135
00136
00137 protected void
00138 file_magerror(struct magic_set *ms, const char *f, ...)
00139 {
00140 va_list va;
00141 va_start(va, f);
00142 file_error_core(ms, 0, f, va, ms->line);
00143 va_end(va);
00144 }
00145
00146 protected void
00147 file_oomem(struct magic_set *ms, size_t len)
00148 {
00149 file_error(ms, errno, "cannot allocate %zu bytes", len);
00150 }
00151
00152 protected void
00153 file_badseek(struct magic_set *ms)
00154 {
00155 file_error(ms, errno, "error seeking");
00156 }
00157
00158 protected void
00159 file_badread(struct magic_set *ms)
00160 {
00161 file_error(ms, errno, "error reading");
00162 }
00163
00164 #ifndef COMPILE_ONLY
00165 protected int
00166 file_buffer(struct magic_set *ms, int fd, const char *inname, const void *buf,
00167 size_t nb)
00168 {
00169 int m;
00170
00171 #ifdef __EMX__
00172 if ((ms->flags & MAGIC_NO_CHECK_APPTYPE) == 0 && inname) {
00173 switch (file_os2_apptype(ms, inname, buf, nb)) {
00174 case -1:
00175 return -1;
00176 case 0:
00177 break;
00178 default:
00179 return 1;
00180 }
00181 }
00182 #endif
00183
00184
00185 if ((ms->flags & MAGIC_NO_CHECK_COMPRESS) != 0 ||
00186 (m = file_zmagic(ms, fd, inname, buf, nb)) == 0) {
00187
00188 if ((ms->flags & MAGIC_NO_CHECK_TAR) != 0 ||
00189 (m = file_is_tar(ms, buf, nb)) == 0) {
00190
00191 if ((ms->flags & MAGIC_NO_CHECK_SOFT) != 0 ||
00192 (m = file_softmagic(ms, buf, nb)) == 0) {
00193
00194 if ((ms->flags & MAGIC_NO_CHECK_ASCII) != 0 ||
00195 (m = file_ascmagic(ms, buf, nb)) == 0) {
00196
00197 if (file_printf(ms, ms->flags & MAGIC_MIME ?
00198 (nb ? "application/octet-stream" :
00199 "application/empty") :
00200 (nb ? "data" :
00201 "empty")) == -1)
00202 return -1;
00203 m = 1;
00204 }
00205 }
00206 }
00207 }
00208 #ifdef BUILTIN_ELF
00209 if ((ms->flags & MAGIC_NO_CHECK_ELF) == 0 && m == 1 && nb > 5 && fd != -1) {
00210
00211
00212
00213
00214
00215
00216
00217
00218 (void)file_tryelf(ms, fd, buf, nb);
00219 }
00220 #endif
00221 return m;
00222 }
00223 #endif
00224
00225 protected int
00226 file_reset(struct magic_set *ms)
00227 {
00228 if (ms->mlist == NULL) {
00229 file_error(ms, 0, "no magic files loaded");
00230 return -1;
00231 }
00232 ms->o.ptr = ms->o.buf;
00233 ms->o.left = ms->o.size;
00234 ms->haderr = 0;
00235 ms->error = -1;
00236 return 0;
00237 }
00238
00239 #define OCTALIFY(n, o) \
00240 \
00241 (void)(*(n)++ = '\\', \
00242 *(n)++ = (((uint32_t)*(o) >> 6) & 3) + '0', \
00243 *(n)++ = (((uint32_t)*(o) >> 3) & 7) + '0', \
00244 *(n)++ = (((uint32_t)*(o) >> 0) & 7) + '0', \
00245 (o)++)
00246
00247 protected const char *
00248 file_getbuffer(struct magic_set *ms)
00249 {
00250 char *pbuf, *op, *np;
00251 size_t psize, len;
00252
00253 if (ms->haderr)
00254 return NULL;
00255
00256 if (ms->flags & MAGIC_RAW)
00257 return ms->o.buf;
00258
00259 len = ms->o.size - ms->o.left;
00260
00261 if (len > (SIZE_T_MAX - 1) / 4) {
00262 file_oomem(ms, len);
00263 return NULL;
00264 }
00265 psize = len * 4 + 1;
00266 if (ms->o.psize < psize) {
00267 if ((pbuf = realloc(ms->o.pbuf, psize)) == NULL) {
00268 file_oomem(ms, psize);
00269 return NULL;
00270 }
00271 ms->o.psize = psize;
00272 ms->o.pbuf = pbuf;
00273 }
00274
00275 #if defined(HAVE_WCHAR_H) && defined(HAVE_MBRTOWC) && defined(HAVE_WCWIDTH)
00276 {
00277 mbstate_t state;
00278 wchar_t nextchar;
00279 int mb_conv = 1;
00280 size_t bytesconsumed;
00281 char *eop;
00282 (void)memset(&state, 0, sizeof(mbstate_t));
00283
00284 np = ms->o.pbuf;
00285 op = ms->o.buf;
00286 eop = op + strlen(ms->o.buf);
00287
00288 while (op < eop) {
00289 bytesconsumed = mbrtowc(&nextchar, op,
00290 (size_t)(eop - op), &state);
00291 if (bytesconsumed == (size_t)(-1) ||
00292 bytesconsumed == (size_t)(-2)) {
00293 mb_conv = 0;
00294 break;
00295 }
00296
00297 if (iswprint(nextchar)) {
00298 (void)memcpy(np, op, bytesconsumed);
00299 op += bytesconsumed;
00300 np += bytesconsumed;
00301 } else {
00302 while (bytesconsumed-- > 0)
00303 OCTALIFY(np, op);
00304 }
00305 }
00306 *np = '\0';
00307
00308
00309 if (mb_conv != 0)
00310 return ms->o.pbuf;
00311 }
00312 #endif
00313
00314 for (np = ms->o.pbuf, op = ms->o.buf; *op; op++) {
00315 if (isprint((unsigned char)*op)) {
00316 *np++ = *op;
00317 } else {
00318 OCTALIFY(np, op);
00319 }
00320 }
00321 *np = '\0';
00322 return ms->o.pbuf;
00323 }
00324
00325 protected int
00326 file_check_mem(struct magic_set *ms, unsigned int level)
00327 {
00328 size_t len;
00329
00330 if (level >= ms->c.len) {
00331 len = (ms->c.len += 20) * sizeof(*ms->c.li);
00332 ms->c.li = (ms->c.li == NULL) ? malloc(len) :
00333 realloc(ms->c.li, len);
00334 if (ms->c.li == NULL) {
00335 file_oomem(ms, len);
00336 return -1;
00337 }
00338 }
00339 ms->c.li[level].got_match = 0;
00340 #ifdef ENABLE_CONDITIONALS
00341 ms->c.li[level].last_match = 0;
00342 ms->c.li[level].last_cond = COND_NONE;
00343 #endif
00344 return 0;
00345 }
00346
00347
00348
00349
00350 #ifndef HAVE_VSNPRINTF
00351 int
00352 vsnprintf(char *buf, size_t len, const char *fmt, va_list ap)
00353 {
00354 return vsprintf(buf, fmt, ap);
00355 }
00356 #endif
00357
00358 #ifndef HAVE_SNPRINTF
00359
00360 int
00361 snprintf(char *buf, size_t len, const char *fmt, ...)
00362 {
00363 int rv;
00364 va_list ap;
00365 va_start(ap, fmt);
00366 rv = vsprintf(buf, fmt, ap);
00367 va_end(ap);
00368 return rv;
00369 }
00370 #endif