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/* hash_check.h - functions to parse and verify a hash file contianing message digests */
#ifndef HASH_CHECK_H
#define HASH_CHECK_H
#include "file.h"
#include "file_set.h"
#ifdef __cplusplus
extern "C" {
#endif
/* bit flags for hash_parser */
enum HpBitFlags {
HpHasFileSize = 0x01,
HpHasEmbeddedCrc32 = 0x02,
HpWrongFileSize = 0x10,
HpWrongEmbeddedCrc32 = 0x20,
HpWrongHashes = 0x40,
HpIsBinaryFile = 0x100
};
#define HP_FAILED(flags) ((flags) & (HpWrongFileSize | HpWrongEmbeddedCrc32 | HpWrongHashes))
#define HP_MAX_HASHES 32
/**
* Parsed message digest.
*/
struct hash_value
{
uint32_t hash_id; /* the id of hash, if it was detected */
uint16_t offset;
unsigned char length;
unsigned char format;
};
/**
* Parsed file info, like the path, size and file message digests.
*/
struct hash_parser {
file_t parsed_path; /* parsed file path */
uint64_t file_size; /* parsed file size, e.g. from magnet link */
int parsed_path_errno;
unsigned bit_flags;
uint64_t found_hash_ids; /* bit mask for matched hash ids */
uint64_t wrong_hashes; /* bit mask for mismatched message digests */
char* line_begin;
unsigned embedded_crc32; /* CRC32 embedded into filename */
unsigned hash_mask; /* the mask of hash ids to verify against */
int hashes_num; /* number of parsed message digests */
struct hash_value hashes[HP_MAX_HASHES];
};
enum HashFileBits {
HashFileExist = 0x01,
HashFileIsEmpty = 0x02,
HashFileHasBom = 0x04,
HashFileHasWrongHashes = 0x08,
HashFileHasMissedFiles = 0x10,
HashFileHasUnparsedLines = 0x20
};
int load_updated_hash_file(struct file_t* hash_file, file_set* set);
int check_hash_file(struct file_t* hash_file, int chdir);
int check_embedded_crc32(struct file_t* file);
void rhash_base32_to_byte(const char* str, unsigned char* bin, int len);
void rhash_hex_to_byte(const char* str, unsigned char* bin, int len);
struct rhash_context;
unsigned get_crc32(struct rhash_context* ctx);
/* note: IS_HEX() is defined on ASCII-8 while isxdigit() only on ASCII-7 */
#define IS_HEX(c) ((c) <= '9' ? (c) >= '0' : (unsigned)(((c) - 'A') & ~0x20) <= ('F' - 'A' + 0U))
#ifdef __cplusplus
} /* extern "C" */
#endif /* __cplusplus */
#endif /* HASH_CHECK_H */
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