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author | 2015-11-08 12:56:12 +0100 | |
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committer | 2015-11-08 12:56:12 +0100 | |
commit | 7c19aac60e12d6f5ea301bdb34d7826a01e0b06f (patch) | |
tree | f310d86aa2c6bfc19d115307dedde4eb0cd52dad /src/lib/util/hashing.cpp | |
parent | a57b46ae933badd7441ce1644711dbb851e2b504 (diff) |
Rename *.c -> *.cpp in our source (nw)
Diffstat (limited to 'src/lib/util/hashing.cpp')
-rw-r--r-- | src/lib/util/hashing.cpp | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/src/lib/util/hashing.cpp b/src/lib/util/hashing.cpp new file mode 100644 index 00000000000..e7f315ecc53 --- /dev/null +++ b/src/lib/util/hashing.cpp @@ -0,0 +1,291 @@ +// license:BSD-3-Clause +// copyright-holders:Aaron Giles +/*************************************************************************** + + hashing.c + + Hashing helper classes. + +***************************************************************************/ + +#include "hashing.h" +#include <zlib.h> + + +//************************************************************************** +// CONSTANTS +//************************************************************************** + +const crc16_t crc16_t::null = { 0 }; +const crc32_t crc32_t::null = { 0 }; +const md5_t md5_t::null = { { 0 } }; +const sha1_t sha1_t::null = { { 0 } }; + + + +//************************************************************************** +// INLINE FUNCTIONS +//************************************************************************** + +//------------------------------------------------- +// char_to_hex - return the hex value of a +// character +//------------------------------------------------- + +inline int char_to_hex(char c) +{ + if (c >= '0' && c <= '9') + return c - '0'; + if (c >= 'a' && c <= 'f') + return 10 + c - 'a'; + if (c >= 'A' && c <= 'F') + return 10 + c - 'A'; + return -1; +} + + + +//************************************************************************** +// SHA-1 HELPERS +//************************************************************************** + +//------------------------------------------------- +// from_string - convert from a string +//------------------------------------------------- + +bool sha1_t::from_string(const char *string, int length) +{ + // must be at least long enough to hold everything + memset(m_raw, 0, sizeof(m_raw)); + if (length == -1) + length = strlen(string); + if (length < 2 * sizeof(m_raw)) + return false; + + // iterate through our raw buffer + for (int bytenum = 0; bytenum < sizeof(m_raw); bytenum++) + { + int upper = char_to_hex(*string++); + int lower = char_to_hex(*string++); + if (upper == -1 || lower == -1) + return false; + m_raw[bytenum] = (upper << 4) | lower; + } + return true; +} + + +//------------------------------------------------- +// as_string - convert to a string +//------------------------------------------------- + +const char *sha1_t::as_string(std::string &buffer) const +{ + buffer.clear(); + for (int i = 0; i < ARRAY_LENGTH(m_raw); i++) + strcatprintf(buffer, "%02x", m_raw[i]); + return buffer.c_str(); +} + + +//************************************************************************** +// MD-5 HELPERS +//************************************************************************** + +//------------------------------------------------- +// from_string - convert from a string +//------------------------------------------------- + +bool md5_t::from_string(const char *string, int length) +{ + // must be at least long enough to hold everything + memset(m_raw, 0, sizeof(m_raw)); + if (length == -1) + length = strlen(string); + if (length < 2 * sizeof(m_raw)) + return false; + + // iterate through our raw buffer + for (int bytenum = 0; bytenum < sizeof(m_raw); bytenum++) + { + int upper = char_to_hex(*string++); + int lower = char_to_hex(*string++); + if (upper == -1 || lower == -1) + return false; + m_raw[bytenum] = (upper << 4) | lower; + } + return true; +} + + +//------------------------------------------------- +// as_string - convert to a string +//------------------------------------------------- + +const char *md5_t::as_string(std::string &buffer) const +{ + buffer.clear(); + for (int i = 0; i < ARRAY_LENGTH(m_raw); i++) + strcatprintf(buffer, "%02x", m_raw[i]); + return buffer.c_str(); +} + + + +//************************************************************************** +// CRC-32 HELPERS +//************************************************************************** + +//------------------------------------------------- +// from_string - convert from a string +//------------------------------------------------- + +bool crc32_t::from_string(const char *string, int length) +{ + // must be at least long enough to hold everything + m_raw = 0; + if (length == -1) + length = strlen(string); + if (length < 2 * sizeof(m_raw)) + return false; + + // iterate through our raw buffer + m_raw = 0; + for (int bytenum = 0; bytenum < sizeof(m_raw) * 2; bytenum++) + { + int nibble = char_to_hex(*string++); + if (nibble == -1) + return false; + m_raw = (m_raw << 4) | nibble; + } + return true; +} + + +//------------------------------------------------- +// as_string - convert to a string +//------------------------------------------------- + +const char *crc32_t::as_string(std::string &buffer) const +{ + strprintf(buffer, "%08x", m_raw); + return buffer.c_str(); +} + + +//------------------------------------------------- +// append - hash a block of data, appending to +// the currently-accumulated value +//------------------------------------------------- + +void crc32_creator::append(const void *data, UINT32 length) +{ + m_accum.m_raw = crc32(m_accum, reinterpret_cast<const Bytef *>(data), length); +} + + + +//************************************************************************** +// CRC-16 HELPERS +//************************************************************************** + +//------------------------------------------------- +// from_string - convert from a string +//------------------------------------------------- + +bool crc16_t::from_string(const char *string, int length) +{ + // must be at least long enough to hold everything + m_raw = 0; + if (length == -1) + length = strlen(string); + if (length < 2 * sizeof(m_raw)) + return false; + + // iterate through our raw buffer + m_raw = 0; + for (int bytenum = 0; bytenum < sizeof(m_raw) * 2; bytenum++) + { + int nibble = char_to_hex(*string++); + if (nibble == -1) + return false; + m_raw = (m_raw << 4) | nibble; + } + return true; +} + +/** + * @fn const char *crc16_t::as_string(std::string &buffer) const + * + * @brief ------------------------------------------------- + * as_string - convert to a string + * -------------------------------------------------. + * + * @param [in,out] buffer The buffer. + * + * @return null if it fails, else a char*. + */ + +const char *crc16_t::as_string(std::string &buffer) const +{ + strprintf(buffer, "%04x", m_raw); + return buffer.c_str(); +} + +/** + * @fn void crc16_creator::append(const void *data, UINT32 length) + * + * @brief ------------------------------------------------- + * append - hash a block of data, appending to the currently-accumulated value + * -------------------------------------------------. + * + * @param data The data. + * @param length The length. + */ + +void crc16_creator::append(const void *data, UINT32 length) +{ + static const UINT16 s_table[256] = + { + 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, + 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, + 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, + 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, + 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, + 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d, + 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4, + 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc, + 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823, + 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b, + 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12, + 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a, + 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41, + 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49, + 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70, + 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78, + 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f, + 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067, + 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e, + 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256, + 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d, + 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405, + 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c, + 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634, + 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab, + 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3, + 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a, + 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92, + 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9, + 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, + 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, + 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 + }; + + const UINT8 *src = reinterpret_cast<const UINT8 *>(data); + + // fetch the current value into a local and rip through the source data + UINT16 crc = m_accum.m_raw; + while (length-- != 0) + crc = (crc << 8) ^ s_table[(crc >> 8) ^ *src++]; + m_accum.m_raw = crc; +} |