text: /*
   * Copyright (c) 2008,2009 Zmanda, Inc.  All Rights Reserved.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published
   * by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * for more details.
   *
   * You should have received a copy of the GNU General Public License along
   * with this program; if not, write to the Free Software Foundation, Inc.,
   * 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   *
   * Contact information: Zmanda Inc., 465 S. Mathilda Ave., Suite 300
   * Sunnyvale, CA 94085, USA, or: http://www.zmanda.com
   */
  
  
  #ifdef HAVE_CONFIG_H
  /* use a relative path here to avoid conflicting with Perl's config.h. */
  #include "../config/config.h"
  #endif
  #ifdef HAVE_REGEX_H
  #include <sys/types.h>
  #include <regex.h>
  #endif
  #ifdef HAVE_AMANDA_H
  #include "amanda.h"
  #endif
  
  #include <glib.h>
  #include <openssl/md5.h>
  #include <openssl/bio.h>
  #include <openssl/evp.h>
  #include <openssl/bn.h>
  #include "s3-util.h"
  
  #ifdef HAVE_REGEX_H
  int
  s3_regexec_wrap(regex_t *regex,
             const char *str,
             size_t nmatch,
             regmatch_t pmatch[],
             int eflags)
  {
      char *message;
      int size;
      int reg_result;
  
      reg_result = regexec(regex, str, nmatch, pmatch, eflags);
      if (reg_result != 0 && reg_result != REG_NOMATCH) {
          size = regerror(reg_result, regex, NULL, 0);
          message = g_malloc(size);
          regerror(reg_result, regex, message, size);
  
          /* this is programmer error (bad regexp), so just log
           * and abort().  There's no good way to signal a
           * permanaent error from interpret_response. */
          g_critical(_("Regex error: %s"), message);
      }
  
      return reg_result;
  }
  #else
  
  int
  s3_regexec_wrap(regex_t *regex,
             const char *str,
             size_t nmatch,
             regmatch_t pmatch[],
             int eflags)
  {
      GMatchInfo *match_info;
      int ret = REG_NOERROR;
      guint i;
  
      g_assert(regex && *regex);
      g_regex_match(*regex, str, eflags, &match_info);
      if (g_match_info_matches(match_info)) {
          g_assert(g_match_info_get_match_count(match_info) <= (glong) nmatch);
          for (i = 0; i < nmatch; i++) {
              pmatch[i].rm_eo = pmatch[i].rm_so = -1;
              g_match_info_fetch_pos(match_info, i, &pmatch[i].rm_so, &pmatch[i].rm_eo);
          }
      } else {
          ret = REG_NOMATCH;
      }
      g_match_info_free(match_info);
      return ret;
  }
  #endif
  
  #ifndef HAVE_AMANDA_H
  char*
  find_regex_substring(const char* base_string, const regmatch_t match)
  {
      g_assert(match.rm_eo >= match.rm_so);
      return g_strndup(base_string+match.rm_so, match.rm_eo - match.rm_so);
  }
  #endif
  
  gchar*
  s3_base64_encode(const GByteArray *to_enc) {
      BIO *bio_b64 = NULL, *bio_buff = NULL;
      long bio_b64_len;
      char *bio_b64_data = NULL, *ret = NULL;
      if (!to_enc) return NULL;
  
      /* Initialize base64 encoding filter */
      bio_b64 = BIO_new(BIO_f_base64());
      g_assert(bio_b64);
      BIO_set_flags(bio_b64, BIO_FLAGS_BASE64_NO_NL);
  
      /* Initialize memory buffer for the base64 encoding */
      bio_buff = BIO_new(BIO_s_mem());
      g_assert(bio_buff);
      bio_buff = BIO_push(bio_b64, bio_buff);
  
      /* Write the MD5 hash into the buffer to encode it in base64 */
      BIO_write(bio_buff, to_enc->data, to_enc->len);
      /* BIO_flush is a macro and GCC 4.1.2 complains without this cast*/
      (void) BIO_flush(bio_buff);
  
      /* Pull out the base64 encoding of the MD5 hash */
      bio_b64_len = BIO_get_mem_data(bio_buff, &bio_b64_data);
      g_assert(bio_b64_data);
      ret = g_strndup(bio_b64_data, bio_b64_len);
  
      /* If bio_b64 is freed separately, freeing bio_buff will
       * invalidly free memory and potentially segfault.
       */
      BIO_free_all(bio_buff);
      return ret;
  }
  
  gchar*
  s3_hex_encode(const GByteArray *to_enc)  {
      guint i;
      gchar *ret = NULL, table[] = "0123456789abcdef";
      if (!to_enc) return NULL;
  
      ret = g_new(gchar, to_enc->len*2 + 1);
      for (i = 0; i < to_enc->len; i++) {
          /* most significant 4 bits */
          ret[i*2] = table[to_enc->data[i] >> 4];
          /* least significant 4 bits */
          ret[i*2 + 1] = table[to_enc->data[i] & 0xf];
      }
      ret[to_enc->len*2] = '\0';
  
      return ret;
  }
  
  GByteArray*
  s3_compute_md5_hash(const GByteArray *to_hash) {
      MD5_CTX md5_ctx;
      GByteArray *ret;
      if (!to_hash) return NULL;
  
      ret = g_byte_array_sized_new(S3_MD5_HASH_BYTE_LEN);
      g_byte_array_set_size(ret, S3_MD5_HASH_BYTE_LEN);
  
      MD5_Init(&md5_ctx);
      MD5_Update(&md5_ctx, to_hash->data, to_hash->len);
      MD5_Final(ret->data, &md5_ctx);
  
      return ret;
  }
  