Base 64编码超长字符串Java溢出，Arduino Energia IDE，TI CC3200

您好，这方面的一些问题我已经研究过了，有人说这是Java的RegEx错误，但我甚至不认为Energia在使用Java。。。有点困惑为什么C代码会出现这个错误

错误：

Exception in thread "Thread-5" java.lang.StackOverflowError
    at java.util.regex.Pattern$Loop.match(Pattern.java:4295)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4227)
    at java.util.regex.Pattern$BranchConn.match(Pattern.java:4078)
    at java.util.regex.Pattern$CharProperty.match(Pattern.java:3345)
    at java.util.regex.Pattern$Branch.match(Pattern.java:4114)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4168)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4295)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4227)
    at java.util.regex.Pattern$BranchConn.match(Pattern.java:4078)
    at java.util.regex.Pattern$CharProperty.match(Pattern.java:3345)
    at java.util.regex.Pattern$Branch.match(Pattern.java:4114)

…而且它可以用上几百行同样的东西

至于正则表达式代码：

请注意，在本例中，我在图像部分硬编码（这是导致错误的字段），只是为了测试目的，我希望通过网络将base64编码的JSON消息传输到web服务，该服务将其作为图片转发到我的电子邮件

如果图像字符串被缩短，则不会发生错误，但这当然是一个字符串太小，无法传输实际图片。非常感谢你的帮助

// [7.12.2] Class template regex_token_iterator
  /**
   * Iterates over submatches in a range (or @a splits a text string).
   *
   * The purpose of this iterator is to enumerate all, or all specified,
   * matches of a regular expression within a text range.  The dereferenced
   * value of an iterator of this class is a std::tr1::sub_match object.
   */
  template<typename _Bi_iter,
       typename _Ch_type = typename iterator_traits<_Bi_iter>::value_type,
       typename _Rx_traits = regex_traits<_Ch_type> >
    class regex_token_iterator
    {
    public:
      typedef basic_regex<_Ch_type, _Rx_traits> regex_type;
      typedef sub_match<_Bi_iter>               value_type;
      typedef std::ptrdiff_t                    difference_type;
      typedef const value_type*                 pointer;
      typedef const value_type&                 reference;
      typedef std::forward_iterator_tag         iterator_category;

    public:
      /**
       * @brief Default constructs a %regex_token_iterator.
       * @todo Implement this function.
       * 
       * A default-constructed %regex_token_iterator is a singular iterator
       * that will compare equal to the one-past-the-end value for any
       * iterator of the same type.
       */
      regex_token_iterator();

      /**
       * Constructs a %regex_token_iterator...
       * @param a          [IN] The start of the text to search.
       * @param b          [IN] One-past-the-end of the text to search.
       * @param re         [IN] The regular expression to search for.
       * @param submatch   [IN] Which submatch to return.  There are some
       *                        special values for this parameter:
       *                        - -1 each enumerated subexpression does NOT
       *                          match the regular expression (aka field
       *                          splitting)
       *                        - 0 the entire string matching the
       *                          subexpression is returned for each match
       *                          within the text.
       *                        - >0 enumerates only the indicated
       *                          subexpression from a match within the text.
       * @param m          [IN] Policy flags for match rules.
       *
       * @todo Implement this function.
       * @doctodo
       */
      regex_token_iterator(_Bi_iter __a, _Bi_iter __b, const regex_type& __re,
               int __submatch = 0,
               regex_constants::match_flag_type __m
               = regex_constants::match_default);

      /**
       * Constructs a %regex_token_iterator...
       * @param a          [IN] The start of the text to search.
       * @param b          [IN] One-past-the-end of the text to search.
       * @param re         [IN] The regular expression to search for.
       * @param submatches [IN] A list of subexpressions to return for each
       *                        regular expression match within the text.
       * @param m          [IN] Policy flags for match rules.
       *
       * @todo Implement this function.
       * @doctodo
       */
      regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
               const regex_type& __re,
               const std::vector<int>& __submatches,
               regex_constants::match_flag_type __m
                 = regex_constants::match_default);

      /**
       * Constructs a %regex_token_iterator...
       * @param a          [IN] The start of the text to search.
       * @param b          [IN] One-past-the-end of the text to search.
       * @param re         [IN] The regular expression to search for.
       * @param submatches [IN] A list of subexpressions to return for each
       *                        regular expression match within the text.
       * @param m          [IN] Policy flags for match rules.

       * @todo Implement this function.
       * @doctodo
       */
      template<std::size_t _Nm>
        regex_token_iterator(_Bi_iter __a, _Bi_iter __b,
                 const regex_type& __re,
                 const int (&__submatches)[_Nm],
                 regex_constants::match_flag_type __m
                 = regex_constants::match_default);

      /**
       * @brief Copy constructs a %regex_token_iterator.
       * @param rhs [IN] A %regex_token_iterator to copy.
       * @todo Implement this function.
       */
      regex_token_iterator(const regex_token_iterator& __rhs);

      /**
       * @brief Assigns a %regex_token_iterator to another.
       * @param rhs [IN] A %regex_token_iterator to copy.
       * @todo Implement this function.
       */
      regex_token_iterator&
      operator=(const regex_token_iterator& __rhs);

      /**
       * @brief Compares a %regex_token_iterator to another for equality.
       * @todo Implement this function.
       */
      bool
      operator==(const regex_token_iterator& __rhs);

      /**
       * @brief Compares a %regex_token_iterator to another for inequality.
       * @todo Implement this function.
       */
      bool
      operator!=(const regex_token_iterator& __rhs);

      /**
       * @brief Dereferences a %regex_token_iterator.
       * @todo Implement this function.
       */
      const value_type&
      operator*();

      /**
       * @brief Selects a %regex_token_iterator member.
       * @todo Implement this function.
       */
      const value_type*
      operator->();

      /**
       * @brief Increments a %regex_token_iterator.
       * @todo Implement this function.
       */
      regex_token_iterator&
      operator++();

      /**
       * @brief Postincrements a %regex_token_iterator.
       * @todo Implement this function.
       */
      regex_token_iterator
      operator++(int);

    private: // data members for exposition only:
      typedef regex_iterator<_Bi_iter, _Ch_type, _Rx_traits> position_iterator;

      position_iterator __position;
      const value_type* __result;
      value_type        __suffix;
      std::size_t       __n;
      std::vector<int>  __subs;
    };

  /** @brief Token iterator for C-style NULL-terminated strings. */
  typedef regex_token_iterator<const char*>             cregex_token_iterator;
  /** @brief Token iterator for standard strings. */
  typedef regex_token_iterator<string::const_iterator>  sregex_token_iterator;
#ifdef _GLIBCXX_USE_WCHAR_T
  /** @brief Token iterator for C-style NULL-terminated wide strings. */
  typedef regex_token_iterator<const wchar_t*>          wcregex_token_iterator;
  /** @brief Token iterator for standard wide-character strings. */
  typedef regex_token_iterator<wstring::const_iterator> wsregex_token_iterator;
#endif

---

进一步解释：当我尝试插入带有预编码base64文本的jpeg图像时，会触发此错误。。。在我尝试实例化我的嵌入式相机之前，我想确保我可以传输一个虚拟图像。我很确定这不是base64代码，而是我一无所知的Java正则表达式（只是它处理长字符串的标记化，似乎与错误有关）。也许它试图在字符串中找到一个模式，但由于它是一个很长的随机字符串，因此无法找到该模式，然后出现故障？

对于与Java正则表达式相关的长字符串，IDE标记解析似乎存在问题。可能会联系他们的讨论论坛以获取更多信息。

该错误实际上意味着正则表达式存在问题，需要太多的“步骤”才能找到匹配项。请共享此正则表达式。当您尝试编辑该文件时，Energia IDE是否会引发此错误？您共享的代码有点无趣-需要帮助的代码位于方法

Base64encode

中。您可以共享

base64.h

/

base64.c

？Wiktor:正则表达式位于哪里？艾伦：是的，错误是由Energia抛出的。克拉斯格：好的，我一会儿也会把这些贴出来。谢谢大家的快速回复，这是下周学校的一个项目，我还需要让我的嵌入式摄像头正常工作。希望我们今天可以解决。进行了适当的编辑以显示regex令牌迭代器函数。。。仍然不确定这是否是罪魁祸首。也许我可以把文件寄给你，Wiktor？它很长。。

#include <string.h>

#include "base64.h"

/* aaaack but it's fast and const should make it shared text page. */
static const unsigned char pr2six[256] =
{
    /* ASCII table */
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,
    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,
    64,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,
    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,
    64, 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, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
    64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
};

int Base64decode_len(const char *bufcoded)
{
    int nbytesdecoded;
    register const unsigned char *bufin;
    register int nprbytes;

    bufin = (const unsigned char *) bufcoded;
    while (pr2six[*(bufin++)] <= 63);

    nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;
    nbytesdecoded = ((nprbytes + 3) / 4) * 3;

    return nbytesdecoded + 1;
}

int Base64decode(char *bufplain, const char *bufcoded)
{
    int nbytesdecoded;
    register const unsigned char *bufin;
    register unsigned char *bufout;
    register int nprbytes;

    bufin = (const unsigned char *) bufcoded;
    while (pr2six[*(bufin++)] <= 63);
    nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;
    nbytesdecoded = ((nprbytes + 3) / 4) * 3;

    bufout = (unsigned char *) bufplain;
    bufin = (const unsigned char *) bufcoded;

    while (nprbytes > 4) {
    *(bufout++) =
        (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
    *(bufout++) =
        (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
    *(bufout++) =
        (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
    bufin += 4;
    nprbytes -= 4;
    }

    /* Note: (nprbytes == 1) would be an error, so just ingore that case */
    if (nprbytes > 1) {
    *(bufout++) =
        (unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);
    }
    if (nprbytes > 2) {
    *(bufout++) =
        (unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);
    }
    if (nprbytes > 3) {
    *(bufout++) =
        (unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);
    }

    *(bufout++) = '\0';
    nbytesdecoded -= (4 - nprbytes) & 3;
    return nbytesdecoded;
}

static const char basis_64[] =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

int Base64encode_len(int len)
{
    return ((len + 2) / 3 * 4) + 1;
}

int Base64encode(char *encoded, const char *string, int len)
{
    int i;
    char *p;

    p = encoded;
    for (i = 0; i < len - 2; i += 3) {
    *p++ = basis_64[(string[i] >> 2) & 0x3F];
    *p++ = basis_64[((string[i] & 0x3) << 4) |
                    ((int) (string[i + 1] & 0xF0) >> 4)];
    *p++ = basis_64[((string[i + 1] & 0xF) << 2) |
                    ((int) (string[i + 2] & 0xC0) >> 6)];
    *p++ = basis_64[string[i + 2] & 0x3F];
    }
    if (i < len) {
    *p++ = basis_64[(string[i] >> 2) & 0x3F];
    if (i == (len - 1)) {
        *p++ = basis_64[((string[i] & 0x3) << 4)];
        *p++ = '=';
    }
    else {
        *p++ = basis_64[((string[i] & 0x3) << 4) |
                        ((int) (string[i + 1] & 0xF0) >> 4)];
        *p++ = basis_64[((string[i + 1] & 0xF) << 2)];
    }
    *p++ = '=';
    }

    *p++ = '\0';
    return p - encoded;
}

#ifndef _BASE64_H_
#define _BASE64_H_

#ifdef __cplusplus
extern "C" {
#endif

int Base64encode_len(int len);
int Base64encode(char * coded_dst, const char *plain_src,int len_plain_src);

int Base64decode_len(const char * coded_src);
int Base64decode(char * plain_dst, const char *coded_src);

#ifdef __cplusplus
}
#endif

#endif //_BASE64_H_