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Comment:Fix the zipfile extension so that it knows that a zero-length BLOB returns a NULL pointer. Forum post ae86934905.
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Timelines: family | ancestors | descendants | both | branch-3.38
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SHA3-256: b75c6bad3a5a165948077026441f02188ba30c7960815486c1973e18992401b3
User & Date: drh 2022-03-19 12:53:43
Context
2022-03-21
11:50
Fix an assert() in sqlite3TableAffinity() that might have been false if there was a prior syntax error in the query. (check-in: 940f1a40 user: drh tags: branch-3.38)
2022-03-19
12:53
Fix the zipfile extension so that it knows that a zero-length BLOB returns a NULL pointer. Forum post ae86934905. (check-in: b75c6bad user: drh tags: branch-3.38)
12:48
Fix the zipfile extension so that it knows that a zero-length BLOB returns a NULL pointer. Forum post ae86934905. (check-in: 5f6d5673 user: drh tags: trunk)
2022-03-17
11:37
Another fix for a corner-case in sqlite_offset() - this one having to do with computed virtual columns in a WITHOUT ROWID table. Also an assertion fault problem with sqlite_offset(). (check-in: 9e72cae2 user: drh tags: branch-3.38)
Changes
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Changes to ext/misc/zipfile.c.

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  if( pTab->zFile ){
    zFile = pTab->zFile;
  }else if( idxNum==0 ){
    zipfileCursorErr(pCsr, "zipfile() function requires an argument");
    return SQLITE_ERROR;
  }else if( sqlite3_value_type(argv[0])==SQLITE_BLOB ){

    const u8 *aBlob = (const u8*)sqlite3_value_blob(argv[0]);
    int nBlob = sqlite3_value_bytes(argv[0]);
    assert( pTab->pFirstEntry==0 );




    rc = zipfileLoadDirectory(pTab, aBlob, nBlob);
    pCsr->pFreeEntry = pTab->pFirstEntry;
    pTab->pFirstEntry = pTab->pLastEntry = 0;
    if( rc!=SQLITE_OK ) return rc;
    bInMemory = 1;
  }else{
    zFile = (const char*)sqlite3_value_text(argv[0]);








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  if( pTab->zFile ){
    zFile = pTab->zFile;
  }else if( idxNum==0 ){
    zipfileCursorErr(pCsr, "zipfile() function requires an argument");
    return SQLITE_ERROR;
  }else if( sqlite3_value_type(argv[0])==SQLITE_BLOB ){
    static const u8 aEmptyBlob = 0;
    const u8 *aBlob = (const u8*)sqlite3_value_blob(argv[0]);
    int nBlob = sqlite3_value_bytes(argv[0]);
    assert( pTab->pFirstEntry==0 );
    if( aBlob==0 ){
      aBlob = &aEmptyBlob;
      nBlob = 0;
    }
    rc = zipfileLoadDirectory(pTab, aBlob, nBlob);
    pCsr->pFreeEntry = pTab->pFirstEntry;
    pTab->pFirstEntry = pTab->pLastEntry = 0;
    if( rc!=SQLITE_OK ) return rc;
    bInMemory = 1;
  }else{
    zFile = (const char*)sqlite3_value_text(argv[0]);
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