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#include "cache.h"
#include "thread-utils.h"

const signed char hexval_table[256] = {
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 00-07 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 08-0f */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 10-17 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 18-1f */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 20-27 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 28-2f */
	  0,  1,  2,  3,  4,  5,  6,  7,		/* 30-37 */
	  8,  9, -1, -1, -1, -1, -1, -1,		/* 38-3f */
	 -1, 10, 11, 12, 13, 14, 15, -1,		/* 40-47 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 48-4f */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 50-57 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 58-5f */
	 -1, 10, 11, 12, 13, 14, 15, -1,		/* 60-67 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 68-67 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 70-77 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 78-7f */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 80-87 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 88-8f */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 90-97 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* 98-9f */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* a0-a7 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* a8-af */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* b0-b7 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* b8-bf */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* c0-c7 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* c8-cf */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* d0-d7 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* d8-df */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* e0-e7 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* e8-ef */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* f0-f7 */
	 -1, -1, -1, -1, -1, -1, -1, -1,		/* f8-ff */
};

int hex_to_bytes(unsigned char *binary, const char *hex, size_t len)
{
	for (; len; len--, hex += 2) {
		unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);

		if (val & ~0xff)
			return -1;
		*binary++ = val;
	}
	return 0;
}

static int get_hash_hex_algop(const char *hex, unsigned char *hash,
			      const struct git_hash_algo *algop)
{
	int i;
	for (i = 0; i < algop->rawsz; i++) {
		int val = hex2chr(hex);
		if (val < 0)
			return -1;
		*hash++ = val;
		hex += 2;
	}
	return 0;
}

int get_sha1_hex(const char *hex, unsigned char *sha1)
{
	return get_hash_hex_algop(hex, sha1, the_hash_algo);
}

int get_oid_hex_algop(const char *hex, struct object_id *oid,
		      const struct git_hash_algo *algop)
{
	return get_hash_hex_algop(hex, oid->hash, algop);
}

/*
 * NOTE: This function relies on hash algorithms being in order from shortest
 * length to longest length.
 */
int get_oid_hex_any(const char *hex, struct object_id *oid)
{
	int i;
	for (i = GIT_HASH_NALGOS - 1; i > 0; i--) {
		if (!get_hash_hex_algop(hex, oid->hash, &hash_algos[i]))
			return i;
	}
	return GIT_HASH_UNKNOWN;
}

int get_oid_hex(const char *hex, struct object_id *oid)
{
	return get_oid_hex_algop(hex, oid, the_hash_algo);
}

int parse_oid_hex_algop(const char *hex, struct object_id *oid,
			const char **end,
			const struct git_hash_algo *algop)
{
	int ret = get_hash_hex_algop(hex, oid->hash, algop);
	if (!ret)
		*end = hex + algop->hexsz;
	return ret;
}

int parse_oid_hex_any(const char *hex, struct object_id *oid, const char **end)
{
	int ret = get_oid_hex_any(hex, oid);
	if (ret)
		*end = hex + hash_algos[ret].hexsz;
	return ret;
}

int parse_oid_hex(const char *hex, struct object_id *oid, const char **end)
{
	return parse_oid_hex_algop(hex, oid, end, the_hash_algo);
}

char *hash_to_hex_algop_r(char *buffer, const unsigned char *hash,
			  const struct git_hash_algo *algop)
{
	static const char hex[] = "0123456789abcdef";
	char *buf = buffer;
	int i;

	for (i = 0; i < algop->rawsz; i++) {
		unsigned int val = *hash++;
		*buf++ = hex[val >> 4];
		*buf++ = hex[val & 0xf];
	}
	*buf = '\0';

	return buffer;
}

char *oid_to_hex_r(char *buffer, const struct object_id *oid)
{
	return hash_to_hex_algop_r(buffer, oid->hash, the_hash_algo);
}

struct hexbuf_array {
	int idx;
	char bufs[4][GIT_MAX_HEXSZ + 1];
};

#ifdef HAVE_THREADS
static pthread_key_t hexbuf_array_key;
static pthread_once_t hexbuf_array_once = PTHREAD_ONCE_INIT;

static void init_hexbuf_array_key(void)
{
	if (pthread_key_create(&hexbuf_array_key, free))
		die(_("failed to initialize threads' key for hash to hex conversion"));
}

#else
static struct hexbuf_array default_hexbuf_array;
#endif

char *hash_to_hex_algop(const unsigned char *hash, const struct git_hash_algo *algop)
{
	struct hexbuf_array *ha;

#ifdef HAVE_THREADS
	void *value;

	if (pthread_once(&hexbuf_array_once, init_hexbuf_array_key))
		die(_("failed to initialize threads' key for hash to hex conversion"));

	value = pthread_getspecific(hexbuf_array_key);
	if (value) {
		ha = (struct hexbuf_array *) value;
	} else {
		ha = xmalloc(sizeof(*ha));
		if (pthread_setspecific(hexbuf_array_key, (void *)ha))
			die(_("failed to set thread buffer for hash to hex conversion"));
	}
#else
	ha = &default_hexbuf_array;
#endif

	ha->idx = (ha->idx + 1) % ARRAY_SIZE(ha->bufs);
	return hash_to_hex_algop_r(ha->bufs[ha->idx], hash, algop);
}

char *hash_to_hex(const unsigned char *hash)
{
	return hash_to_hex_algop(hash, the_hash_algo);
}

char *oid_to_hex(const struct object_id *oid)
{
	return hash_to_hex_algop(oid->hash, the_hash_algo);
}
debug log:

solving 4f2f163d5e ...
found 4f2f163d5e in https://public-inbox.org/git/b47445fa1cef6d4523dd0ca336f7ee22bce89466.1593208411.git.matheus.bernardino@usp.br/
found da51e64929 in git.git.git
preparing index
index prepared:
100644 da51e64929a4f4973406d001a66e5ec72e76e628	hex.c

applying [1/1] https://public-inbox.org/git/b47445fa1cef6d4523dd0ca336f7ee22bce89466.1593208411.git.matheus.bernardino@usp.br/
diff --git a/hex.c b/hex.c
index da51e64929..4f2f163d5e 100644

Checking patch hex.c...
Applied patch hex.c cleanly.

index at:
100644 4f2f163d5e7bf9bc6f16424b0e94553f2be67cb8	hex.c

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