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/* apk_blob.h - Alpine Package Keeper (APK)
*
* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#ifndef APK_BLOB_H
#define APK_BLOB_H
#include <ctype.h>
#include <string.h>
#include "apk_defines.h"
#include "apk_openssl.h"
typedef const unsigned char *apk_spn_match;
typedef unsigned char apk_spn_match_def[256 / 8];
struct apk_blob {
long len;
char *ptr;
};
typedef struct apk_blob apk_blob_t;
typedef int (*apk_blob_cb)(void *ctx, apk_blob_t blob);
#define BLOB_FMT "%.*s"
#define BLOB_PRINTF(b) (int)(b).len, (b).ptr
#define APK_CHECKSUM_NONE 0
#define APK_CHECKSUM_MD5 16
#define APK_CHECKSUM_SHA1 20
#define APK_CHECKSUM_DEFAULT APK_CHECKSUM_SHA1
#define APK_CHECKSUM_MAX APK_CHECKSUM_SHA1
/* Enough space for a hexdump of the longest checksum possible plus
* a two-character type prefix */
#define APK_BLOB_CHECKSUM_BUF (2 + (2 * APK_CHECKSUM_MAX))
/* Internal container for checksums */
struct apk_checksum {
unsigned char data[APK_CHECKSUM_MAX];
unsigned char type;
};
static inline const EVP_MD *apk_checksum_evp(int type)
{
switch (type) {
case APK_CHECKSUM_MD5:
return EVP_md5();
case APK_CHECKSUM_SHA1:
return EVP_sha1();
}
return EVP_md_null();
}
static inline const EVP_MD *apk_checksum_default(void)
{
return apk_checksum_evp(APK_CHECKSUM_DEFAULT);
}
#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_STRLIT(s) ((apk_blob_t){sizeof(s)-1, (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)});
}
static inline apk_blob_t apk_blob_trim(apk_blob_t blob)
{
apk_blob_t b = blob;
while (b.len > 0 && isspace(b.ptr[b.len-1]))
b.len--;
return b;
}
char *apk_blob_cstr(apk_blob_t str);
apk_blob_t apk_blob_dup(apk_blob_t blob);
int apk_blob_spn(apk_blob_t blob, const apk_spn_match accept, apk_blob_t *l, apk_blob_t *r);
int apk_blob_cspn(apk_blob_t blob, const apk_spn_match 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);
apk_blob_t apk_blob_pushed(apk_blob_t buffer, apk_blob_t left);
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_sort(apk_blob_t a, apk_blob_t b);
int apk_blob_starts_with(apk_blob_t a, apk_blob_t b);
int apk_blob_ends_with(apk_blob_t str, apk_blob_t suffix);
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 char *apk_blob_chr(apk_blob_t b, unsigned char ch)
{
return memchr(b.ptr, ch, b.len);
}
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_push_fmt(apk_blob_t *to, const char *fmt, ...)
__attribute__ ((format (printf, 2, 3)));
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);
int apk_blob_pull_blob_match(apk_blob_t *b, apk_blob_t match);
#endif
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