131 lines
4.2 KiB
C
131 lines
4.2 KiB
C
/* apk_blob.h - Alpine Package Keeper (APK)
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*
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* Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
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* Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
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* All rights reserved.
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*
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* SPDX-License-Identifier: GPL-2.0-only
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*/
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#ifndef APK_BLOB_H
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#define APK_BLOB_H
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#include <ctype.h>
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#include <string.h>
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#include "apk_defines.h"
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#include "apk_openssl.h"
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typedef const unsigned char *apk_spn_match;
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typedef unsigned char apk_spn_match_def[256 / 8];
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struct apk_blob {
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long len;
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char *ptr;
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};
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typedef struct apk_blob apk_blob_t;
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typedef int (*apk_blob_cb)(void *ctx, apk_blob_t blob);
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#define BLOB_FMT "%.*s"
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#define BLOB_PRINTF(b) (int)(b).len, (b).ptr
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#define APK_CHECKSUM_NONE 0
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#define APK_CHECKSUM_MD5 16
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#define APK_CHECKSUM_SHA1 20
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#define APK_CHECKSUM_DEFAULT APK_CHECKSUM_SHA1
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#define APK_CHECKSUM_MAX APK_CHECKSUM_SHA1
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/* Enough space for a hexdump of the longest checksum possible plus
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* a two-character type prefix */
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#define APK_BLOB_CHECKSUM_BUF (2 + (2 * APK_CHECKSUM_MAX))
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/* Internal container for checksums */
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struct apk_checksum {
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unsigned char data[APK_CHECKSUM_MAX];
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unsigned char type;
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};
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static inline const EVP_MD *apk_checksum_evp(int type)
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{
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switch (type) {
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case APK_CHECKSUM_MD5:
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return EVP_md5();
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case APK_CHECKSUM_SHA1:
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return EVP_sha1();
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}
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return EVP_md_null();
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}
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static inline const EVP_MD *apk_checksum_default(void)
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{
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return apk_checksum_evp(APK_CHECKSUM_DEFAULT);
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}
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#define APK_BLOB_IS_NULL(blob) ((blob).ptr == NULL)
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#define APK_BLOB_NULL ((apk_blob_t){0, NULL})
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#define APK_BLOB_BUF(buf) ((apk_blob_t){sizeof(buf), (char *)(buf)})
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#define APK_BLOB_CSUM(csum) ((apk_blob_t){(csum).type, (char *)(csum).data})
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#define APK_BLOB_STRUCT(s) ((apk_blob_t){sizeof(s), (char*)&(s)})
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#define APK_BLOB_STRLIT(s) ((apk_blob_t){sizeof(s)-1, (char *)(s)})
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#define APK_BLOB_PTR_LEN(beg,len) ((apk_blob_t){(len), (beg)})
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#define APK_BLOB_PTR_PTR(beg,end) APK_BLOB_PTR_LEN((beg),(end)-(beg)+1)
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static inline apk_blob_t APK_BLOB_STR(const char *str)
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{
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if (str == NULL)
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return APK_BLOB_NULL;
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return ((apk_blob_t){strlen(str), (void *)(str)});
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}
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static inline apk_blob_t apk_blob_trim(apk_blob_t blob)
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{
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apk_blob_t b = blob;
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while (b.len > 0 && isspace(b.ptr[b.len-1]))
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b.len--;
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return b;
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}
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char *apk_blob_cstr(apk_blob_t str);
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apk_blob_t apk_blob_dup(apk_blob_t blob);
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int apk_blob_spn(apk_blob_t blob, const apk_spn_match accept, apk_blob_t *l, apk_blob_t *r);
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int apk_blob_cspn(apk_blob_t blob, const apk_spn_match reject, apk_blob_t *l, apk_blob_t *r);
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int apk_blob_split(apk_blob_t blob, apk_blob_t split, apk_blob_t *l, apk_blob_t *r);
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int apk_blob_rsplit(apk_blob_t blob, char split, apk_blob_t *l, apk_blob_t *r);
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apk_blob_t apk_blob_pushed(apk_blob_t buffer, apk_blob_t left);
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unsigned long apk_blob_hash_seed(apk_blob_t, unsigned long seed);
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unsigned long apk_blob_hash(apk_blob_t str);
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int apk_blob_compare(apk_blob_t a, apk_blob_t b);
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int apk_blob_sort(apk_blob_t a, apk_blob_t b);
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int apk_blob_starts_with(apk_blob_t a, apk_blob_t b);
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int apk_blob_ends_with(apk_blob_t str, apk_blob_t suffix);
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int apk_blob_for_each_segment(apk_blob_t blob, const char *split,
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apk_blob_cb cb, void *ctx);
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static inline void apk_blob_checksum(apk_blob_t b, const EVP_MD *md, struct apk_checksum *csum)
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{
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csum->type = EVP_MD_size(md);
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EVP_Digest(b.ptr, b.len, csum->data, NULL, md, NULL);
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}
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static inline char *apk_blob_chr(apk_blob_t b, unsigned char ch)
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{
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return memchr(b.ptr, ch, b.len);
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}
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void apk_blob_push_blob(apk_blob_t *to, apk_blob_t literal);
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void apk_blob_push_uint(apk_blob_t *to, unsigned int value, int radix);
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void apk_blob_push_csum(apk_blob_t *to, struct apk_checksum *csum);
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void apk_blob_push_base64(apk_blob_t *to, apk_blob_t binary);
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void apk_blob_push_hexdump(apk_blob_t *to, apk_blob_t binary);
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void apk_blob_push_fmt(apk_blob_t *to, const char *fmt, ...)
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__attribute__ ((format (printf, 2, 3)));
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void apk_blob_pull_char(apk_blob_t *b, int expected);
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unsigned int apk_blob_pull_uint(apk_blob_t *b, int radix);
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void apk_blob_pull_csum(apk_blob_t *b, struct apk_checksum *csum);
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void apk_blob_pull_base64(apk_blob_t *b, apk_blob_t to);
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void apk_blob_pull_hexdump(apk_blob_t *b, apk_blob_t to);
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int apk_blob_pull_blob_match(apk_blob_t *b, apk_blob_t match);
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#endif
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