Difference between revisions of "Truxton file get signature"
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(Created page with "This retrieves the signature of the file's contents. It corresponds to the <code>Signature</code> column of the <code> File</code> table. =Syntax= <syntaxhigh...") |
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This retrieves the signature of the file's contents. | This retrieves the signature of the file's contents. | ||
| − | It corresponds to the <code>Signature</code> column of the <code>[[File Table | File]]</code> table. | + | It corresponds to the <code>[Signature]</code> column of the <code><nowiki>[</nowiki>[[File Table|File]]<nowiki>]</nowiki></code> table. |
=Syntax= | =Syntax= | ||
| − | < | + | <source lang="C"> |
uint32_t truxton_file_get_signature( uint64_t file_handle ); | uint32_t truxton_file_get_signature( uint64_t file_handle ); | ||
| − | </ | + | </source> |
=Parameters= | =Parameters= | ||
| Line 15: | Line 15: | ||
=Sample= | =Sample= | ||
| − | + | <source lang="C" highlight="10"> | |
| − | < | + | void print_it( uint64_t truxton ) |
| − | void print_it(uint64_t truxton) | ||
{ | { | ||
| − | uint64_t file = truxton_file_open_md5(truxton, "9ec8fb6095c35eff2b236863b7caaf10"); | + | uint64_t file = truxton_file_open_md5( truxton, "9ec8fb6095c35eff2b236863b7caaf10" ); |
if ( file != 0 ) | if ( file != 0 ) | ||
| Line 32: | Line 31: | ||
truxton_file_free( file ); | truxton_file_free( file ); | ||
} | } | ||
| − | </ | + | </source> |
| − | Note, the <code> | + | Note, the <code>PRIX32</code> in the sample code above is the new standard way of [https://en.wikipedia.org/wiki/C_data_types#Printf_and_scanf_format_specifiers formatting] a 32-bit integer in C. |
Over the years, different compilers on different operating systems used different format specifiers for things, these <code>PRI</code> macros, along with some tricky string concatenation the compilers perform for you, allow you to maintain a single code base without a bunch of macro magic. | Over the years, different compilers on different operating systems used different format specifiers for things, these <code>PRI</code> macros, along with some tricky string concatenation the compilers perform for you, allow you to maintain a single code base without a bunch of macro magic. | ||
Latest revision as of 04:46, 13 February 2021
This retrieves the signature of the file's contents.
It corresponds to the [Signature] column of the [File] table.
Syntax
uint32_t truxton_file_get_signature( uint64_t file_handle );
Parameters
file_handle
The handle created by the truxton_file_open_id or truxton_file_open_md5 call.
Return value
The first four bytes of the file's contents as an integer.
Sample
void print_it( uint64_t truxton )
{
uint64_t file = truxton_file_open_md5( truxton, "9ec8fb6095c35eff2b236863b7caaf10" );
if ( file != 0 )
{
return;
}
uint32_t signature = truxton_file_get_signature( file );
printf( "Signature is %08" PRIX32 "\n", signature );
truxton_file_free( file );
}
Note, the PRIX32 in the sample code above is the new standard way of formatting a 32-bit integer in C.
Over the years, different compilers on different operating systems used different format specifiers for things, these PRI macros, along with some tricky string concatenation the compilers perform for you, allow you to maintain a single code base without a bunch of macro magic.
