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use defines for modes in sqlite3Codec

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This commit is contained in:
Stephen Lombardo 2018-09-11 17:24:13 -04:00
parent 369b22da7e
commit 6ed6609ecb
1 changed files with 11 additions and 3 deletions
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14
src/crypto.c
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@ -438,6 +438,14 @@ int sqlcipher_codec_pragma(sqlite3* db, int iDb, Parse *pParse, const char *zLef
return 1;
}
/* these constants are used internally within SQLite's pager.c to differentiate between
operations on the main database or journal pages. This is important in the context
of a rekey operations, where the journal must be written using the original key
material (to allow a transactional rollback), while the new database pages are being
written with the new key material*/
#define CODEC_READ_OP 3
#define CODEC_WRITE_OP 6
#define CODEC_JOURNAL_OP 7
/*
* sqlite3Codec can be called in multiple modes.
@ -470,7 +478,7 @@ static void* sqlite3Codec(void *iCtx, void *data, Pgno pgno, int mode) {
CODEC_TRACE("sqlite3Codec: switch mode=%d offset=%d\n", mode, offset);
switch(mode) {
case 3: /* decrypt */
case CODEC_READ_OP: /* decrypt */
if(pgno == 1) /* copy initial part of file header or SQLite magic to buffer */
memcpy(buffer, plaintext_header_sz ? pData : (void *) SQLITE_FILE_HEADER, offset);
@ -480,10 +488,10 @@ static void* sqlite3Codec(void *iCtx, void *data, Pgno pgno, int mode) {
return pData;
break;
case 6: /* encrypt database page, operate on write context and fall through to case 7*/
case CODEC_WRITE_OP: /* encrypt database page, operate on write context and fall through to case 7, so the write context is used*/
cctx = CIPHER_WRITE_CTX;
case 7: /* encrypt journal page, operate on read context use to get the original page data from the database */
case CODEC_JOURNAL_OP: /* encrypt journal page, operate on read context use to get the original page data from the database */
if(pgno == 1) /* copy initial part of file header or salt to buffer */
memcpy(buffer, plaintext_header_sz ? pData : kdf_salt, offset);