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examples: general: extract function demonstrating OID parsing

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This commit is contained in:
Patrick Steinhardt 2016-09-01 12:44:08 +02:00
parent 29d9afc0fb
commit c313e3d986
1 changed files with 44 additions and 26 deletions
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70
examples/general.c
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@ -43,6 +43,7 @@
#include <stdio.h>
#include <string.h>
static void oid_parsing(git_oid *out);
static void object_database(git_repository *repo, git_oid *oid);
static void commit_writing(git_repository *repo);
static void commit_parsing(git_repository *repo);
@ -71,6 +72,8 @@ static void check_error(int error_code, const char *action)
int main (int argc, char** argv)
{
git_oid oid;
// Initialize the library, this will set up any global state which libgit2 needs
// including threading and crypto
git_libgit2_init();
@ -91,32 +94,7 @@ int main (int argc, char** argv)
error = git_repository_open(&repo, repo_path);
check_error(error, "opening repository");
// ### SHA-1 Value Conversions
// For our first example, we will convert a 40 character hex value to the
// 20 byte raw SHA1 value.
printf("*Hex to Raw*\n");
char hex[] = "4a202b346bb0fb0db7eff3cffeb3c70babbd2045";
// The `git_oid` is the structure that keeps the SHA value. We will use
// this throughout the example for storing the value of the current SHA
// key we're working with.
git_oid oid;
git_oid_fromstr(&oid, hex);
// Once we've converted the string into the oid value, we can get the raw
// value of the SHA by accessing `oid.id`
// Next we will convert the 20 byte raw SHA1 value to a human readable 40
// char hex value.
printf("\n*Raw to Hex*\n");
char out[GIT_OID_HEXSZ+1];
out[GIT_OID_HEXSZ] = '\0';
// If you have a oid, you can easily get the hex value of the SHA as well.
git_oid_fmt(out, &oid);
printf("SHA hex string: %s\n", out);
oid_parsing(&oid);
object_database(repo, &oid);
commit_writing(repo);
commit_parsing(repo);
@ -134,6 +112,46 @@ int main (int argc, char** argv)
return 0;
}
/**
* ### SHA-1 Value Conversions
*/
static void oid_parsing(git_oid *oid)
{
char out[GIT_OID_HEXSZ+1];
char hex[] = "4a202b346bb0fb0db7eff3cffeb3c70babbd2045";
printf("*Hex to Raw*\n");
/**
* For our first example, we will convert a 40 character hex value to the
* 20 byte raw SHA1 value.
*
* The `git_oid` is the structure that keeps the SHA value. We will use
* this throughout the example for storing the value of the current SHA
* key we're working with.
*/
git_oid_fromstr(oid, hex);
// Once we've converted the string into the oid value, we can get the raw
// value of the SHA by accessing `oid.id`
// Next we will convert the 20 byte raw SHA1 value to a human readable 40
// char hex value.
printf("\n*Raw to Hex*\n");
out[GIT_OID_HEXSZ] = '\0';
/**
* If you have a oid, you can easily get the hex value of the SHA as well.
*/
git_oid_fmt(out, oid);
/**
* If you have a oid, you can easily get the hex value of the SHA as well.
*/
git_oid_fmt(out, oid);
printf("SHA hex string: %s\n", out);
}
/**
* ### Working with the Object Database
*