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#include "cache.h"
#include "sha1-array.h"
#include "sha1-lookup.h"

void sha1_array_append(struct sha1_array *array, const unsigned char *sha1)
{
ALLOC_GROW(array->sha1, array->nr + 1, array->alloc);
hashcpy(array->sha1[array->nr++], sha1);
array->sorted = 0;
}

static int void_hashcmp(const void *a, const void *b)
{
return hashcmp(a, b);
}

void sha1_array_sort(struct sha1_array *array)
{
qsort(array->sha1, array->nr, sizeof(*array->sha1), void_hashcmp);
array->sorted = 1;
}

static const unsigned char *sha1_access(size_t index, void *table)
{
unsigned char (*array)[20] = table;
return array[index];
}

int sha1_array_lookup(struct sha1_array *array, const unsigned char *sha1)
{
if (!array->sorted)
sha1_array_sort(array);
return sha1_pos(sha1, array->sha1, array->nr, sha1_access);
}

void sha1_array_clear(struct sha1_array *array)
{
free(array->sha1);
array->sha1 = NULL;
array->nr = 0;
array->alloc = 0;
array->sorted = 0;
}

void sha1_array_for_each_unique(struct sha1_array *array,
for_each_sha1_fn fn,
void *data)
{
int i;

if (!array->sorted)
sha1_array_sort(array);

for (i = 0; i < array->nr; i++) {
if (i > 0 && !hashcmp(array->sha1[i], array->sha1[i-1]))
continue;
fn(array->sha1[i], data);
}
}
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