'\" '\" Copyright (c) 1989-1993 The Regents of the University of California. '\" Copyright (c) 1994-1996 Sun Microsystems, Inc. '\" '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" '\" RCS: @(#) $Id: CrtMathFnc.3,v 1.3 2000/04/14 23:01:49 hobbs Exp $ '\" .so man.macros .TH Tcl_CreateMathFunc 3 7.0 Tcl "Tcl Library Procedures" .BS .SH NAME Tcl_CreateMathFunc \- Define a new math function for expressions .SH SYNOPSIS .nf \fB#include \fR .sp \fBTcl_CreateMathFunc\fR(\fIinterp, name, numArgs, argTypes, proc, clientData\fR) .SH ARGUMENTS .AS Tcl_ValueType clientData .AP Tcl_Interp *interp in Interpreter in which new function will be defined. .AP char *name in Name for new function. .AP int numArgs in Number of arguments to new function; also gives size of \fIargTypes\fR array. .AP Tcl_ValueType *argTypes in Points to an array giving the permissible types for each argument to function. .AP Tcl_MathProc *proc in Procedure that implements the function. .AP ClientData clientData in Arbitrary one-word value to pass to \fIproc\fR when it is invoked. .BE .SH DESCRIPTION .PP Tcl allows a number of mathematical functions to be used in expressions, such as \fBsin\fR, \fBcos\fR, and \fBhypot\fR. \fBTcl_CreateMathFunc\fR allows applications to add additional functions to those already provided by Tcl or to replace existing functions. \fIName\fR is the name of the function as it will appear in expressions. If \fIname\fR doesn't already exist as a function then a new function is created. If it does exist, then the existing function is replaced. \fINumArgs\fR and \fIargTypes\fR describe the arguments to the function. Each entry in the \fIargTypes\fR array must be either TCL_INT, TCL_DOUBLE, or TCL_EITHER to indicate whether the corresponding argument must be an integer, a double-precision floating value, or either, respectively. .PP Whenever the function is invoked in an expression Tcl will invoke \fIproc\fR. \fIProc\fR should have arguments and result that match the type \fBTcl_MathProc\fR: .CS typedef int Tcl_MathProc( ClientData \fIclientData\fR, Tcl_Interp *\fIinterp\fR, Tcl_Value *\fIargs\fR, Tcl_Value *\fIresultPtr\fR); .CE .PP When \fIproc\fR is invoked the \fIclientData\fR and \fIinterp\fR arguments will be the same as those passed to \fBTcl_CreateMathFunc\fR. \fIArgs\fR will point to an array of \fInumArgs\fR Tcl_Value structures, which describe the actual arguments to the function: .CS typedef struct Tcl_Value { Tcl_ValueType \fItype\fR; long \fIintValue\fR; double \fIdoubleValue\fR; } Tcl_Value; .CE .PP The \fItype\fR field indicates the type of the argument and is either TCL_INT or TCL_DOUBLE. It will match the \fIargTypes\fR value specified for the function unless the \fIargTypes\fR value was TCL_EITHER. Tcl converts the argument supplied in the expression to the type requested in \fIargTypes\fR, if that is necessary. Depending on the value of the \fItype\fR field, the \fIintValue\fR or \fIdoubleValue\fR field will contain the actual value of the argument. .PP \fIProc\fR should compute its result and store it either as an integer in \fIresultPtr->intValue\fR or as a floating value in \fIresultPtr->doubleValue\fR. It should set also \fIresultPtr->type\fR to either TCL_INT or TCL_DOUBLE to indicate which value was set. Under normal circumstances \fIproc\fR should return TCL_OK. If an error occurs while executing the function, \fIproc\fR should return TCL_ERROR and leave an error message in the interpreter's result. .SH KEYWORDS expression, mathematical function f='#n11'>11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id$
 ***************************************************************************/
#include "setup.h"

#ifndef CURL_DISABLE_HTTP
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>

#include "urldata.h" /* it includes http_chunks.h */
#include "sendf.h"   /* for the client write stuff */

#include "content_encoding.h"
#include "http.h"
#include "memory.h"
#include "easyif.h" /* for Curl_convert_to_network prototype */

#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>

/* The last #include file should be: */
#include "memdebug.h"

/*
 * Chunk format (simplified):
 *
 * <HEX SIZE>[ chunk extension ] CRLF
 * <DATA> CRLF
 *
 * Highlights from RFC2616 section 3.6 say:

   The chunked encoding modifies the body of a message in order to
   transfer it as a series of chunks, each with its own size indicator,
   followed by an OPTIONAL trailer containing entity-header fields. This
   allows dynamically produced content to be transferred along with the
   information necessary for the recipient to verify that it has
   received the full message.

       Chunked-Body   = *chunk
                        last-chunk
                        trailer
                        CRLF

       chunk          = chunk-size [ chunk-extension ] CRLF
                        chunk-data CRLF
       chunk-size     = 1*HEX
       last-chunk     = 1*("0") [ chunk-extension ] CRLF

       chunk-extension= *( ";" chunk-ext-name [ "=" chunk-ext-val ] )
       chunk-ext-name = token
       chunk-ext-val  = token | quoted-string
       chunk-data     = chunk-size(OCTET)
       trailer        = *(entity-header CRLF)

   The chunk-size field is a string of hex digits indicating the size of
   the chunk. The chunked encoding is ended by any chunk whose size is
   zero, followed by the trailer, which is terminated by an empty line.

 */


void Curl_httpchunk_init(struct connectdata *conn)
{
  struct Curl_chunker *chunk = &conn->data->reqdata.proto.http->chunk;
  chunk->hexindex=0; /* start at 0 */
  chunk->dataleft=0; /* no data left yet! */
  chunk->state = CHUNK_HEX; /* we get hex first! */
}

/*
 * chunk_read() returns a OK for normal operations, or a positive return code
 * for errors. STOP means this sequence of chunks is complete.  The 'wrote'
 * argument is set to tell the caller how many bytes we actually passed to the
 * client (for byte-counting and whatever).
 *
 * The states and the state-machine is further explained in the header file.
 *
 * This function always uses ASCII hex values to accommodate non-ASCII hosts.
 * For example, 0x0d and 0x0a are used instead of '\r' and '\n'.
 */
CHUNKcode Curl_httpchunk_read(struct connectdata *conn,
                              char *datap,
                              ssize_t datalen,
                              ssize_t *wrotep)
{
  CURLcode result=CURLE_OK;
  struct SessionHandle *data = conn->data;
  struct Curl_chunker *ch = &data->reqdata.proto.http->chunk;
  struct Curl_transfer_keeper *k = &data->reqdata.keep;
  size_t piece;
  size_t length = (size_t)datalen;
  size_t *wrote = (size_t *)wrotep;

  *wrote = 0; /* nothing's written yet */

  while(length) {
    switch(ch->state) {
    case CHUNK_HEX:
       /* Check for an ASCII hex digit.
          We avoid the use of isxdigit to accommodate non-ASCII hosts. */
       if((*datap >= 0x30 && *datap <= 0x39)    /* 0-9 */
       || (*datap >= 0x41 && *datap <= 0x46)    /* A-F */
       || (*datap >= 0x61 && *datap <= 0x66)) { /* a-f */
        if(ch->hexindex < MAXNUM_SIZE) {
          ch->hexbuffer[ch->hexindex] = *datap;
          datap++;
          length--;
          ch->hexindex++;
        }
        else {
          return CHUNKE_TOO_LONG_HEX; /* longer hex than we support */
        }
      }
      else {
        if(0 == ch->hexindex) {
          /* This is illegal data, we received junk where we expected
             a hexadecimal digit. */
          return CHUNKE_ILLEGAL_HEX;
        }
        /* length and datap are unmodified */
        ch->hexbuffer[ch->hexindex]=0;
#ifdef CURL_DOES_CONVERSIONS
        /* convert to host encoding before calling strtoul */
        result = Curl_convert_from_network(conn->data,
                                           ch->hexbuffer,
                                           ch->hexindex);
        if(result != CURLE_OK) {
          /* Curl_convert_from_network calls failf if unsuccessful */
          /* Treat it as a bad hex character */
          return(CHUNKE_ILLEGAL_HEX);
        }
#endif /* CURL_DOES_CONVERSIONS */
        ch->datasize=strtoul(ch->hexbuffer, NULL, 16);
        ch->state = CHUNK_POSTHEX;
      }
      break;

    case CHUNK_POSTHEX:
      /* In this state, we're waiting for CRLF to arrive. We support
         this to allow so called chunk-extensions to show up here
         before the CRLF comes. */
      if(*datap == 0x0d)
        ch->state = CHUNK_CR;
      length--;
      datap++;
      break;

    case CHUNK_CR:
      /* waiting for the LF */
      if(*datap == 0x0a) {
        /* we're now expecting data to come, unless size was zero! */
        if(0 == ch->datasize) {
          if (conn->bits.trailerHdrPresent!=TRUE) {
            /* No Trailer: header found - revert to original Curl processing */
            ch->state = CHUNK_STOP;
            if (1 == length) {
               /* This is the final byte, return right now */
               return CHUNKE_STOP;
            }
          }
          else {
            ch->state = CHUNK_TRAILER; /* attempt to read trailers */
            conn->trlPos=0;
          }
        }
        else
          ch->state = CHUNK_DATA;
      }
      else
        /* previously we got a fake CR, go back to CR waiting! */
        ch->state = CHUNK_CR;
      datap++;
      length--;
      break;

    case CHUNK_DATA:
      /* we get pure and fine data

         We expect another 'datasize' of data. We have 'length' right now,
         it can be more or less than 'datasize'. Get the smallest piece.
      */
      piece = (ch->datasize >= length)?length:ch->datasize;

      /* Write the data portion available */
#ifdef HAVE_LIBZ
      switch (data->reqdata.keep.content_encoding) {
        case IDENTITY:
#endif
          if(!k->ignorebody)
            result = Curl_client_write(conn, CLIENTWRITE_BODY, datap,
                                       piece);
#ifdef HAVE_LIBZ
          break;

        case DEFLATE:
          /* update data->reqdata.keep.str to point to the chunk data. */
          data->reqdata.keep.str = datap;
          result = Curl_unencode_deflate_write(conn, &data->reqdata.keep,
                                               (ssize_t)piece);
          break;

        case GZIP:
          /* update data->reqdata.keep.str to point to the chunk data. */
          data->reqdata.keep.str = datap;
          result = Curl_unencode_gzip_write(conn, &data->reqdata.keep,
                                            (ssize_t)piece);
          break;

        case COMPRESS:
        default:
          failf (conn->data,
                 "Unrecognized content encoding type. "
                 "libcurl understands `identity', `deflate' and `gzip' "
                 "content encodings.");
          return CHUNKE_BAD_ENCODING;
      }
#endif

      if(result)
        return CHUNKE_WRITE_ERROR;

      *wrote += piece;

      ch->datasize -= piece; /* decrease amount left to expect */
      datap += piece;    /* move read pointer forward */
      length -= piece;   /* decrease space left in this round */

      if(0 == ch->datasize)
        /* end of data this round, we now expect a trailing CRLF */
        ch->state = CHUNK_POSTCR;
      break;

    case CHUNK_POSTCR:
      if(*datap == 0x0d) {
        ch->state = CHUNK_POSTLF;
        datap++;
        length--;
      }
      else
        return CHUNKE_BAD_CHUNK;
      break;

    case CHUNK_POSTLF:
      if(*datap == 0x0a) {
        /*
         * The last one before we go back to hex state and start all
         * over.
         */
        Curl_httpchunk_init(conn);
        datap++;
        length--;
      }
      else
        return CHUNKE_BAD_CHUNK;
      break;

    case CHUNK_TRAILER:
      /* conn->trailer is assumed to be freed in url.c on a
         connection basis */
      if (conn->trlPos >= conn->trlMax) {
        char *ptr;
        if(conn->trlMax) {
          conn->trlMax *= 2;
          ptr = (char*)realloc(conn->trailer,conn->trlMax);
        }
        else {
          conn->trlMax=128;
          ptr = (char*)malloc(conn->trlMax);
        }
        if(!ptr)
          return CHUNKE_OUT_OF_MEMORY;
        conn->trailer = ptr;
      }
      conn->trailer[conn->trlPos++]=*datap;

      if(*datap == 0x0d)
        ch->state = CHUNK_TRAILER_CR;
      else {
        datap++;
        length--;
     }
      break;

    case CHUNK_TRAILER_CR:
      if(*datap == 0x0d) {
        ch->state = CHUNK_TRAILER_POSTCR;
        datap++;
        length--;
      }
      else
        return CHUNKE_BAD_CHUNK;
      break;

    case CHUNK_TRAILER_POSTCR:
      if (*datap == 0x0a) {
        conn->trailer[conn->trlPos++]=0x0a;
        conn->trailer[conn->trlPos]=0;
        if (conn->trlPos==2) {
          ch->state = CHUNK_STOP;
          return CHUNKE_STOP;
        }
        else {
#ifdef CURL_DOES_CONVERSIONS
          /* Convert to host encoding before calling Curl_client_write */
          result = Curl_convert_from_network(conn->data,
                                             conn->trailer,
                                             conn->trlPos);
          if(result != CURLE_OK) {
            /* Curl_convert_from_network calls failf if unsuccessful */
            /* Treat it as a bad chunk */
            return(CHUNKE_BAD_CHUNK);
          }
#endif /* CURL_DOES_CONVERSIONS */
          Curl_client_write(conn, CLIENTWRITE_HEADER,
                            conn->trailer, conn->trlPos);
        }
        ch->state = CHUNK_TRAILER;
        conn->trlPos=0;
        datap++;
        length--;
      }
      else
        return CHUNKE_BAD_CHUNK;
      break;

    case CHUNK_STOP:
      /* If we arrive here, there is data left in the end of the buffer
         even if there's no more chunks to read */
      ch->dataleft = length;
      return CHUNKE_STOP; /* return stop */
    default:
      return CHUNKE_STATE_ERROR;
    }
  }
  return CHUNKE_OK;
}
#endif /* CURL_DISABLE_HTTP */