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This write-up in particular is focused on the technical specifications of the user-created. This document is more directed at anyone that wants to implement their own library to read or interface with.
If you find anything in this document to be misleading, incomplete, or flat-out incorrect feel free to shoot me an email at Wunkolo at gmail. Previous work includes my now-abandoned run-time exploitation framework SaiPal and the more recent Windows explorer thumbnail extension SaiThumbs.
Amazing anti-aliased drawings. Highly accurate composition with 16bit ARGB channels. Simple but powerful user interface, easy to learn. Data protection function to avoid abnormal termination such as bugs. Each layer, mask, and related meta data is stored in an individual pseudo-file which also has a layer of block-level encryption.
The file itself is encrypted in ECB blocks in which any randomly accessed block can be decrypted by also decrypting the appropriate Table-Block and accessing its bit key found within. This document will mostly cover the method used for sai’s user created.
An individual block in a. Every block index that is a multiple of 0, , , etc is a Table-Block containing meta-data about the block itself and the blocks after it. Every other block that is not a Table-Block is a Data-Block: Different files related to Sai use different static keys.
The keyvault used for the. Table-Blocks can be decrypted by random access using only their multiple-of block index and the the UserKey.
The first block of a. When decrypting a Table-Block, four of the keys within UserKey are indexed by the four bytes of the bit block-index and then summed together. This sum is exclusive-ored with the current 4-byte cipher-word and the block-index followed by a bit left rotation of the result. When decrypting a Data-Block, an initial decryption vector is given which selects the appropriate integers from UserKey using the individual bytes of the bit vector integer and xors with the vector integer itself, and subtracts this value from the cipher to get the plaintext before passing on the vector to the next round using the cipher integer.
The input Vector is the checksum integer found in the Table-Block. Each index of table-entries corresponds to the appropriate block index after the table index. The first checksum entry found within the Table-Block is a checksum of the table itself, excluding the first bit integer.
Setting the first checksum to 0 and calculating the checksum of the entire table produces the same results as if the first entry was skipped. All integers are exclusive-ored with an initial checksum of zero, which is rotated left 1 bit before the exclusive-or operation.
Finally the lowest bit is set, making all checksums an odd number. If the Data-Block’s generated checksum does not match the checksum found at the appropriate table entry within the Table-Block then the Data-Block is considered corrupted. Caching Sai internally uses a Direct Mapped cache table to speed up the random access and decryption of a file by caching both Table-Blocks and Data-Blocks.
An arbitrary block number will have its appropriate cache entry looked up by first shifting the BlockNumber integer right by 14 bits and comparing both the upper 18 bits of the block ID to the lower 31 bits of the cache entry found within the internally mounted file object.
Should these two numbers match then a cache-hit has occurred. Otherwise the block is to fully loaded and decrypted into the cache. The highest bit of the cache table line is the dirty bit which notes if the block is due for a write-back before a new block is to overwrite the entry.
Cache size seems to generally be the block-size divided by 8 and will be a different size depending on the file being handled. This cache mechanism is Sai’s mechanism to minimize the need for constant file IO stalls at run-time and for efficient file-writing and flushing. Changes are fully “flushed” simply by writing any remaining cache lines to the file with the upper dirty bit set and adjusting appropriate checksums within appropriate Table-Blocks if needed.
If you plan to implement a library that reads from. Table-Blocks should at the very least be cached as almost every random access of a. File System Now that the cipher can be fully randomly accessed and decrypted, the virtual file system actually implemented can be deciphered. The file system found after decrypting will be described as a Virtual File system or VFS Internally sai refers to them as a VFS along with terminology such as “mounting” within its error messages.
Individual files are described by a File Allocation Table that describe the name, timestamp, starting block index, and the size in bytes of the data. Folders are described by having their Type variable set to Folder and the starting Block variable instead points to another Data-Block of 64 FATEntries depicting the contents of the folder. When reading file-data of an FATEntry, files are not stored continuously.
TableBlocks may intercept the file stream and must be skipped. So when reading filedata you must abstract away table blocks. This means when reading a file, you must skip all table blocks as if they did not exist and skip over them to simulate continuous files So offsets such as: The full hierarchy of files can be traversed simply by iterating through all 64 entries of the FatBlock within block index 2 and stopping at the entry whose Flags variable is set to 0.
If the entry is a file then simply go to the starting block index and read Size amount of bytes continuously, decrypting appropriate Data-Blocks along the way should Size be larger than 1 block 0x bytes.
Padded bytes within a block will always be 0. From this point on it is assumed you are capable of decrypting the file for random access and can interpret the internal file system format. Now we will look at the actual files and the strucutre in which they are placed within this virtual file system. Here is a sample file structure of a. Serialization Streams Before going into the file formats a specific format of serialization needs to be explained that is found across the internal files.
A size of 0 delimits the end of the table. Format of the Serial-Table found within Sai. One could trace what an unknown serial entry does by finding what runtime object gets written to and finding out when that specific field gets used again. Data Data Data 0 1 2 oser is the little endian storage of reso. In code the identifier oser is actually defined as something along the lines of: This integer gets written so that entire streams of unneeded data may be skipped. If two streams reso and lyid were next to each other, one could skip to the lyid stream by reading bit identifier reso to see that it does not match up with lyid and use the next bit Size integer to know the amount of bytes to skip to get to the next stream.
A tag identifier of 0 delimits the end of a Serial Stream. Sample code for reading a serial stream. Seek File.
Files “. An example chipset: Within the hash function this null-terminated string is repeated continuously until it fits a byte span.
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