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#include "clar_libgit2.h"
#include "posix.h"
#include "filter.h"
#include "buf_text.h"
#include "git2/sys/filter.h"
#define VERY_SECURE_ENCRYPTION(b) ((b) ^ 0xff)
int bitflip_filter_apply(
git_filter *self,
void **payload,
git_buf *to,
const git_buf *from,
const git_filter_source *source)
{
const unsigned char *src = (const unsigned char *)from->ptr;
unsigned char *dst;
size_t i;
GIT_UNUSED(self); GIT_UNUSED(payload);
/* verify that attribute path match worked as expected */
cl_assert_equal_i(
0, git__strncmp("hero", git_filter_source_path(source), 4));
if (!from->size)
return 0;
cl_git_pass(git_buf_grow(to, from->size));
dst = (unsigned char *)to->ptr;
for (i = 0; i < from->size; i++)
dst[i] = VERY_SECURE_ENCRYPTION(src[i]);
to->size = from->size;
return 0;
}
static void bitflip_filter_free(git_filter *f)
{
git__free(f);
}
git_filter *create_bitflip_filter(void)
{
git_filter *filter = git__calloc(1, sizeof(git_filter));
cl_assert(filter);
filter->version = GIT_FILTER_VERSION;
filter->attributes = "+bitflip";
filter->shutdown = bitflip_filter_free;
filter->apply = bitflip_filter_apply;
return filter;
}
int reverse_filter_apply(
git_filter *self,
void **payload,
git_buf *to,
const git_buf *from,
const git_filter_source *source)
{
const unsigned char *src = (const unsigned char *)from->ptr;
const unsigned char *end = src + from->size;
unsigned char *dst;
GIT_UNUSED(self); GIT_UNUSED(payload); GIT_UNUSED(source);
/* verify that attribute path match worked as expected */
cl_assert_equal_i(
0, git__strncmp("hero", git_filter_source_path(source), 4));
if (!from->size)
return 0;
cl_git_pass(git_buf_grow(to, from->size));
dst = (unsigned char *)to->ptr + from->size - 1;
while (src < end)
*dst-- = *src++;
to->size = from->size;
return 0;
}
static void reverse_filter_free(git_filter *f)
{
git__free(f);
}
git_filter *create_reverse_filter(const char *attrs)
{
git_filter *filter = git__calloc(1, sizeof(git_filter));
cl_assert(filter);
filter->version = GIT_FILTER_VERSION;
filter->attributes = attrs;
filter->shutdown = reverse_filter_free;
filter->apply = reverse_filter_apply;
return filter;
}
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