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/* apk_blob.h - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation. See http://www.gnu.org/ for details.
*/
#ifndef APK_BLOB_H
#define APK_BLOB_H
#include <string.h>
#include <openssl/evp.h>
#include "apk_defines.h"
struct apk_blob {
unsigned int len;
char *ptr;
};
typedef struct apk_blob apk_blob_t;
typedef int (*apk_blob_cb)(void *ctx, apk_blob_t blob);
#define APK_CHECKSUM_NONE 0
#define APK_CHECKSUM_MD5 16
#define APK_CHECKSUM_SHA1 20
/* Internal cointainer for MD5 or SHA1 */
struct apk_checksum {
unsigned char data[20];
unsigned char type;
};
static inline const EVP_MD *apk_default_checksum(void)
{
return EVP_sha1();
}
static inline const EVP_MD *apk_get_digest(int type)
{
switch (type) {
case APK_CHECKSUM_MD5:
return EVP_md5();
case APK_CHECKSUM_SHA1:
return EVP_sha1();
}
return EVP_md_null();
}
#define APK_BLOB_IS_NULL(blob) ((blob).ptr == NULL)
#define APK_BLOB_NULL ((apk_blob_t){0, NULL})
#define APK_BLOB_BUF(buf) ((apk_blob_t){sizeof(buf), (char *)(buf)})
#define APK_BLOB_CSUM(csum) ((apk_blob_t){(csum).type, (char *)(csum).data})
#define APK_BLOB_STRUCT(s) ((apk_blob_t){sizeof(s), (char*)&(s)})
#define APK_BLOB_PTR_LEN(beg,len) ((apk_blob_t){(len), (beg)})
#define APK_BLOB_PTR_PTR(beg,end) APK_BLOB_PTR_LEN((beg),(end)-(beg)+1)
static inline apk_blob_t APK_BLOB_STR(const char *str)
{
if (str == NULL)
return APK_BLOB_NULL;
return ((apk_blob_t){strlen(str), (void *)(str)});
}
char *apk_blob_cstr(apk_blob_t str);
int apk_blob_spn(apk_blob_t blob, const char *accept, apk_blob_t *l, apk_blob_t *r);
int apk_blob_cspn(apk_blob_t blob, const char *reject, apk_blob_t *l, apk_blob_t *r);
int apk_blob_split(apk_blob_t blob, apk_blob_t split, apk_blob_t *l, apk_blob_t *r);
int apk_blob_rsplit(apk_blob_t blob, char split, apk_blob_t *l, apk_blob_t *r);
unsigned long apk_blob_hash_seed(apk_blob_t, unsigned long seed);
unsigned long apk_blob_hash(apk_blob_t str);
int apk_blob_compare(apk_blob_t a, apk_blob_t b);
int apk_blob_for_each_segment(apk_blob_t blob, const char *split,
apk_blob_cb cb, void *ctx);
static inline void apk_blob_checksum(apk_blob_t b, const EVP_MD *md, struct apk_checksum *csum)
{
csum->type = EVP_MD_size(md);
EVP_Digest(b.ptr, b.len, csum->data, NULL, md, NULL);
}
static inline const int apk_checksum_compare(const struct apk_checksum *a,
const struct apk_checksum *b)
{
return apk_blob_compare(APK_BLOB_PTR_LEN((char *) a->data, a->type),
APK_BLOB_PTR_LEN((char *) b->data, b->type));
}
void apk_blob_push_blob(apk_blob_t *to, apk_blob_t literal);
void apk_blob_push_uint(apk_blob_t *to, unsigned int value, int radix);
void apk_blob_push_csum(apk_blob_t *to, struct apk_checksum *csum);
void apk_blob_push_base64(apk_blob_t *to, apk_blob_t binary);
void apk_blob_push_hexdump(apk_blob_t *to, apk_blob_t binary);
void apk_blob_pull_char(apk_blob_t *b, int expected);
unsigned int apk_blob_pull_uint(apk_blob_t *b, int radix);
void apk_blob_pull_csum(apk_blob_t *b, struct apk_checksum *csum);
void apk_blob_pull_base64(apk_blob_t *b, apk_blob_t to);
void apk_blob_pull_hexdump(apk_blob_t *b, apk_blob_t to);
#endif
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