Rhino C++ API  8.20
Public Member Functions | Static Public Member Functions | Public Attributes | Static Public Attributes | List of all members
ON_SHA1_Hash Class Reference
OpenNURBS

#include <opennurbs_sha1.h>

Public Member Functions

 ON_SHA1_Hash ()
 The default constructor creates a zero digest sha1 hash. More...
 
 ON_SHA1_Hash (const ON_SHA1_Hash &)=default
 
 ~ON_SHA1_Hash ()=default
 
ON__UINT32 CRC32 (ON__UINT32 current_remainder) const
 Calculating a SHA1 hash is faster than calculating a CRC on the same information. This function calculates the ON_CRC value of the 20 byte digest. Calculating a sha1 hash and then using CRC32(0) is an excellent and efficient way to get a high quality 4 byte CRC. More...
 
void Dump (class ON_TextLog &text_log) const
 
bool IsEmptyContentHash () const
 
bool IsSet () const
 
bool IsZeroDigentOrEmptyContentHash () const
 
bool IsZeroDigest () const
 
bool IsZeroDigestOrEmptyContentHash () const
 
ON_SHA1_Hash & operator= (const ON_SHA1_Hash &)=default
 
bool Read (class ON_BinaryArchive &archive)
 
const ON_wString ToString (bool bUpperCaseHexadecimalDigits) const
 
const ON_wString ToStringEx (bool bUpperCaseHexadecimalDigits) const
 
const ON_String ToUTF8String (bool bUpperCaseHexadecimalDigits) const
 
bool Write (class ON_BinaryArchive &archive) const
 

Static Public Member Functions

static ON_SHA1_Hash BufferContentHash (const void *buffer, size_t sizeof_buffer)
 
static int Compare (const ON_SHA1_Hash &a, const ON_SHA1_Hash &b)
 
static ON_SHA1_Hash FileContentHash (const char *file_name, ON__UINT64 &sizeof_file)
 
static ON_SHA1_Hash FileContentHash (const wchar_t *file_name, ON__UINT64 &sizeof_file)
 
static ON_SHA1_Hash FileContentHash (FILE *file, ON__UINT64 &sizeof_file)
 
static ON_SHA1_Hash FileSystemPathHash (const char *path)
 
static ON_SHA1_Hash FileSystemPathHash (const char *path, bool bIgnoreCase)
 
static ON_SHA1_Hash FileSystemPathHash (const wchar_t *path)
 
static ON_SHA1_Hash FileSystemPathHash (const wchar_t *path, bool bIgnoreCase)
 
static const ON_SHA1_Hash FromString (const ON_wString string_to_parse, bool bParseLeasingSpaces, bool bParseInteriorSpace, bool bParseInteriorHyphen, ON_SHA1_Hash failure_return_value)
 
static ON_SHA1_Hash StringHash (const char *null_terminated_string)
 
static ON_SHA1_Hash StringHash (const char *str, size_t str_length, ON__UINT64 &byte_count)
 
static ON_SHA1_Hash StringHash (const ON_String &str, ON__UINT64 &byte_count)
 
static ON_SHA1_Hash StringHash (const ON_wString &str, ON__UINT64 &byte_count)
 
static ON_SHA1_Hash StringHash (const wchar_t *null_terminated_string)
 
static ON_SHA1_Hash StringHash (const wchar_t *str, size_t str_length, ON__UINT64 &byte_count)
 

Public Attributes

ON__UINT8 m_digest [20]
 

Static Public Attributes

static const ON_SHA1_Hash EmptyContentHash
 SHA-1 hash of zero bytes. More...
 
static const ON_SHA1_Hash ZeroDigest
 all digest bytes are zero More...
 

Detailed Description

Copyright (c) 1993-2022 Robert McNeel & Associates. All rights reserved. OpenNURBS, Rhinoceros, and Rhino3D are registered trademarks of Robert McNeel & Associates.

THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT EXPRESS OR IMPLIED WARRANTY. ALL IMPLIED WARRANTIES OF FITNESS FOR ANY PARTICULAR PURPOSE AND OF MERCHANTABILITY ARE HEREBY DISCLAIMED.

For complete openNURBS copyright information see http://www.opennurbs.org.

Constructor & Destructor Documentation

◆ ON_SHA1_Hash() [1/2]

ON_SHA1_Hash::ON_SHA1_Hash ( )

The default constructor creates a zero digest sha1 hash.

◆ ~ON_SHA1_Hash()

ON_SHA1_Hash::~ON_SHA1_Hash ( )
default

◆ ON_SHA1_Hash() [2/2]

ON_SHA1_Hash::ON_SHA1_Hash ( const ON_SHA1_Hash &  )
default

Member Function Documentation

◆ BufferContentHash()

static ON_SHA1_Hash ON_SHA1_Hash::BufferContentHash ( const void *  buffer,
size_t  sizeof_buffer 
)
static

Parameters: buffer - [in] sizeof_buffer - [in] number of bytes in buffer Returns: SHA1-1 hash of the buffer.

◆ Compare()

static int ON_SHA1_Hash::Compare ( const ON_SHA1_Hash &  a,
const ON_SHA1_Hash &  b 
)
static

◆ CRC32()

ON__UINT32 ON_SHA1_Hash::CRC32 ( ON__UINT32  current_remainder) const

Calculating a SHA1 hash is faster than calculating a CRC on the same information. This function calculates the ON_CRC value of the 20 byte digest. Calculating a sha1 hash and then using CRC32(0) is an excellent and efficient way to get a high quality 4 byte CRC.

Parameters
current_remainderNonzero values are rare in this context. When in doubt, pass 0.
Returns
ON_CRC32(seed, 20, m_digest)

◆ Dump()

void ON_SHA1_Hash::Dump ( class ON_TextLog &  text_log) const

◆ FileContentHash() [1/3]

static ON_SHA1_Hash ON_SHA1_Hash::FileContentHash ( const char *  file_name,
ON__UINT64 &  sizeof_file 
)
static

◆ FileContentHash() [2/3]

static ON_SHA1_Hash ON_SHA1_Hash::FileContentHash ( const wchar_t *  file_name,
ON__UINT64 &  sizeof_file 
)
static

Parameters: file_name - [in] Name of file sizeof_file - [out] number of bytes in file Returns: SHA1-1 hash of the buffer.

◆ FileContentHash() [3/3]

static ON_SHA1_Hash ON_SHA1_Hash::FileContentHash ( FILE *  file,
ON__UINT64 &  sizeof_file 
)
static

Parameters: file - [in] File stream from ON_FileStream::Open(...,L"rb"); sizeof_file - [out] number of bytes in file Returns: SHA1-1 hash of the file stream from the current offset to the end of the file.

◆ FileSystemPathHash() [1/4]

static ON_SHA1_Hash ON_SHA1_Hash::FileSystemPathHash ( const char *  path)
static

◆ FileSystemPathHash() [2/4]

static ON_SHA1_Hash ON_SHA1_Hash::FileSystemPathHash ( const char *  path,
bool  bIgnoreCase 
)
static

◆ FileSystemPathHash() [3/4]

static ON_SHA1_Hash ON_SHA1_Hash::FileSystemPathHash ( const wchar_t *  path)
static

Description: Return a hash of the file system path that is independent of the size of wchar_t, constant across platforms, and constant across variations in the way the path is formatted.

Parameters: path - [in] File system path to a directory or file.

Returns: SHA1-1 hash of the buffer.

Example: These file system paths have identical values of FileSystemPathHash(). /x/y/z/name.ext \x\y\z\name.ext /x///<y//z/name.ext /x/y/a/b/c/../../../z/name.ext /X/Y/Z/NAME.EXT (When ON_ComparePathIgnoreCase() is true)

Remarks: This function uses the value of ON_FileSystemPath::PlatformPathIgnoreCase() to determine if case should be ignored. Use the version with a bIgnoreCase parameter if you want to explicitly control this decision.

◆ FileSystemPathHash() [4/4]

static ON_SHA1_Hash ON_SHA1_Hash::FileSystemPathHash ( const wchar_t *  path,
bool  bIgnoreCase 
)
static

◆ FromString()

static const ON_SHA1_Hash ON_SHA1_Hash::FromString ( const ON_wString  string_to_parse,
bool  bParseLeasingSpaces,
bool  bParseInteriorSpace,
bool  bParseInteriorHyphen,
ON_SHA1_Hash  failure_return_value 
)
static

Description: Parse a string of 40 hexadecimal digits to create a SHA-1 hash. Parameters: string_to_parse - [in] bParseLeadingSpaces - [in] If true, leading space characters are parsed. Otherwise leading space characters cause parsing to fail. bParseInteriorSpace - [in] If true, interior space characters are parsed. Otherwise interior space characters cause parsing to fail. bParseInteriorHyphen - [in] If true, interior hyphen characters are parsed. Otherwise interior hyphen characters cause parsing to fail. bIgnoreInternalSpaces - [in] If true, isolated hyphens are ignored until 40 hex digits are read. bIgnoreInternalHyphens - [in] If true, leading spaces and isolated interior spaces are ignored until 40 hex digits are read. failure_return_value - [in] Value to return if string_to_parse cannot be parsed as 40 hex digits. Returns: If parsing is successful, the value of the SHA-1 hash is returned. Otherwise failure_return_value is returned.

◆ IsEmptyContentHash()

bool ON_SHA1_Hash::IsEmptyContentHash ( ) const

Returns: True if this and ON_SHA1_Hash::EmptyContentHash have identical digest values.

◆ IsSet()

bool ON_SHA1_Hash::IsSet ( ) const

Returns: True if this hash is not equal to ON_SHA1_Hash::EmptyContentHash or ON_SHA1_Hash::ZeroDigest. Remarks: ON_SHA1_Hash::EmptyContentHash is the SHA1 of hashing zero bytes and has a non zero digest. ON_SHA1_Hash::ZeroDigest is 20 bytes of zeros. Opennurbs uses ON_SHA1_Hash::ZeroDigest to indicate a SHA1 has is not initialized.

◆ IsZeroDigentOrEmptyContentHash()

bool ON_SHA1_Hash::IsZeroDigentOrEmptyContentHash ( ) const
Deprecated:
Use IsZeroDigestOrEmptyContentHash() instead. (Spelling error in this one's name.

◆ IsZeroDigest()

bool ON_SHA1_Hash::IsZeroDigest ( ) const

Returns: True if this and ON_SHA1_Hash::ZeroDigest have identical digest values.

◆ IsZeroDigestOrEmptyContentHash()

bool ON_SHA1_Hash::IsZeroDigestOrEmptyContentHash ( ) const

◆ operator=()

ON_SHA1_Hash& ON_SHA1_Hash::operator= ( const ON_SHA1_Hash &  )
default

◆ Read()

bool ON_SHA1_Hash::Read ( class ON_BinaryArchive &  archive)

◆ StringHash() [1/6]

static ON_SHA1_Hash ON_SHA1_Hash::StringHash ( const char *  null_terminated_string)
static

◆ StringHash() [2/6]

static ON_SHA1_Hash ON_SHA1_Hash::StringHash ( const char *  str,
size_t  str_length,
ON__UINT64 &  byte_count 
)
static

◆ StringHash() [3/6]

static ON_SHA1_Hash ON_SHA1_Hash::StringHash ( const ON_String &  str,
ON__UINT64 &  byte_count 
)
static

Parameters: str - [in] byte_count - [out] number of bytes in the string. Returns: SHA1-1 hash of the UTF-8 encoding of the string. (Platforms and endian independent.)

◆ StringHash() [4/6]

static ON_SHA1_Hash ON_SHA1_Hash::StringHash ( const ON_wString &  str,
ON__UINT64 &  byte_count 
)
static

Parameters: str - [in] string byte_count - [out] number of bytes in UTF-8 encoding of the string. Returns: SHA1-1 hash of the UTF-8 encoding of the string. (Platforms and endian independent.)

◆ StringHash() [5/6]

static ON_SHA1_Hash ON_SHA1_Hash::StringHash ( const wchar_t *  null_terminated_string)
static

◆ StringHash() [6/6]

static ON_SHA1_Hash ON_SHA1_Hash::StringHash ( const wchar_t *  str,
size_t  str_length,
ON__UINT64 &  byte_count 
)
static

◆ ToString()

const ON_wString ON_SHA1_Hash::ToString ( bool  bUpperCaseHexadecimalDigits) const

Parameters: bUpperCaseHexadecimalDigits - [in] false - use 0-9, a-f true - use 0-9, A-F Returns: The SHA-1 hash value as a 40 hexadecimal digits. The first digit in the string is the hexadecimal value of m_digest[0].

◆ ToStringEx()

const ON_wString ON_SHA1_Hash::ToStringEx ( bool  bUpperCaseHexadecimalDigits) const

Description: Same as ToString but prints EmptyContentSHA1 or ZeroSHA1 for those two special cases.

◆ ToUTF8String()

const ON_String ON_SHA1_Hash::ToUTF8String ( bool  bUpperCaseHexadecimalDigits) const

Parameters: bUpperCaseHexadecimalDigits - [in] false - use 0-9, a-f true - use 0-9, A-F Returns: The SHA-1 hash value as a 40 hexadecimal digits. The first digit in the string is the hexadecimal value of m_digest[0].

◆ Write()

bool ON_SHA1_Hash::Write ( class ON_BinaryArchive &  archive) const

Member Data Documentation

◆ EmptyContentHash

const ON_SHA1_Hash ON_SHA1_Hash::EmptyContentHash
static

SHA-1 hash of zero bytes.

◆ m_digest

ON__UINT8 ON_SHA1_Hash::m_digest[20]

◆ ZeroDigest

const ON_SHA1_Hash ON_SHA1_Hash::ZeroDigest
static

all digest bytes are zero

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