diff options
Diffstat (limited to 'ACE/ace/Codecs.cpp')
| -rw-r--r-- | ACE/ace/Codecs.cpp | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/ACE/ace/Codecs.cpp b/ACE/ace/Codecs.cpp new file mode 100644 index 00000000000..d28cda908d1 --- /dev/null +++ b/ACE/ace/Codecs.cpp @@ -0,0 +1,227 @@ +#include "ace/Codecs.h" +#include "ace/Log_Msg.h" +#include "ace/OS_Memory.h" +#include "ace/OS_NS_ctype.h" + +ACE_RCSID (ace, + Codecs, + "$Id$") + +namespace +{ + // Just in case ... +#undef alphabet +#undef pad +#undef max_columns + + // Symbols which form the Base64 alphabet (Defined as per RFC 2045) + ACE_Byte const alphabet[] = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; + + // The padding character used in the encoding + ACE_Byte const pad = '='; + + // Number of columns per line of encoded output (Can have a maximum + // value of 76). + int const max_columns = 72; +} + +ACE_BEGIN_VERSIONED_NAMESPACE_DECL + +bool ACE_Base64::init_ = false; + +ACE_Byte ACE_Base64::decoder_[256]; + +ACE_Byte ACE_Base64::member_[256]; + +ACE_Byte* +ACE_Base64::encode (const ACE_Byte* input, + const size_t input_len, + size_t* output_len) +{ + if (!ACE_Base64::init_) + ACE_Base64::init(); + + if (!input) + return 0; + + ACE_Byte* result = 0; + + size_t length = ((input_len + 2) / 3) * 4; + size_t num_lines = length / max_columns + 1; + length += num_lines + 1; + ACE_NEW_RETURN (result, ACE_Byte[length], 0); + + int char_count = 0; + int bits = 0; + size_t pos = 0; + int cols = 0; + + for (size_t i = 0; i < input_len; ++i) + { + bits += input[i]; + char_count++; + + if (char_count == 3) + { + result[pos++] = alphabet[bits >> 18]; + result[pos++] = alphabet[(bits >> 12) & 0x3f]; + result[pos++] = alphabet[(bits >> 6) & 0x3f]; + result[pos++] = alphabet[bits & 0x3f]; + cols += 4; + if (cols == max_columns) { + result[pos++] = '\n'; + cols = 0; + } + bits = 0; + char_count = 0; + } + else + { + bits <<= 8; + } + } + + if (char_count != 0) + { + bits <<= (16 - (8 * char_count)); + result[pos++] = alphabet[bits >> 18]; + result[pos++] = alphabet[(bits >> 12) & 0x3f]; + if (char_count == 1) + { + result[pos++] = pad; + result[pos++] = pad; + } + else + { + result[pos++] = alphabet[(bits >> 6) & 0x3f]; + result[pos++] = pad; + } + if (cols > 0) + result[pos++] = '\n'; + } + result[pos] = 0; + *output_len = pos; + return result; +} + +size_t +ACE_Base64::length (const ACE_Byte* input) +{ + if (!ACE_Base64::init_) + ACE_Base64::init(); + + ACE_Byte* ptr = const_cast<ACE_Byte*> (input); + while (*ptr != 0 && + (member_[*(ptr)] == 1 || *ptr == pad + || ACE_OS::ace_isspace (*ptr))) + ptr++; + size_t len = ptr - input; + len = ((len + 3) / 4) * 3 + 1 ; + return len; +} + +ACE_Byte* +ACE_Base64::decode (const ACE_Byte* input, size_t* output_len) +{ + if (!ACE_Base64::init_) + ACE_Base64::init(); + + if (!input) + return 0; + + size_t result_len = ACE_Base64::length (input); + ACE_Byte* result = 0; + ACE_NEW_RETURN (result, ACE_Byte[result_len], 0); + + ACE_Byte* ptr = const_cast<ACE_Byte*> (input); + while (*ptr != 0 && + (member_[*(ptr)] == 1 || *ptr == pad + || ACE_OS::ace_isspace (*ptr))) + ptr++; + size_t input_len = ptr - input; + + int char_count = 0; + int bits = 0; + size_t pos = 0; + + size_t i = 0; + for (; i < input_len; ++i) + { + if (input[i] == pad) + break; + if (!ACE_Base64::member_[input[i]]) + continue; + bits += decoder_[input[i]]; + char_count++; + + if (char_count == 4) + { + result[pos++] = static_cast<ACE_Byte> (bits >> 16); + result[pos++] = static_cast<ACE_Byte> ((bits >> 8) & 0xff); + result[pos++] = static_cast<ACE_Byte> (bits & 0xff); + bits = 0; + char_count = 0; + } + else + { + bits <<= 6; + } + } + + int errors = 0; + if ( i == input_len) + { + if (char_count) + { + ACE_ERROR ((LM_ERROR, + ACE_LIB_TEXT ("Decoding incomplete: atleast %d bits truncated\n"), + (4 - char_count) * 6)); + errors++; + } + } + else + { + switch (char_count) + { + case 1: + ACE_ERROR ((LM_ERROR, + ACE_LIB_TEXT ("Decoding incomplete: atleast 2 bits missing\n"))); + errors++; + break; + case 2: + result[pos++] = static_cast<ACE_Byte> (bits >> 10); + break; + case 3: + result[pos++] = static_cast<ACE_Byte> (bits >> 16); + result[pos++] = static_cast<ACE_Byte> ((bits >> 8) & 0xff); + break; + } + } + + if (errors) + { + delete[] result; + return 0; + } + result[pos] = 0; + *output_len = pos; + return result; +} + +void +ACE_Base64::init () +{ + if (!ACE_Base64::init_) + { + for (ACE_Byte i = 0; i < sizeof (alphabet); ++i) + { + ACE_Base64::decoder_[alphabet[i]] = i; + ACE_Base64::member_ [alphabet[i]] = 1; + } + ACE_Base64::init_ = true; + } + return; +} + +ACE_END_VERSIONED_NAMESPACE_DECL |