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Decompressing PNG Image Data Procedure DecodeBlock Begin While True Do Begin CODE = DecodeUsingLengthTable () If CODE = 256 Then Return Else If CODE < 256 Then OutputByte (CODE) Else Begin EXTRA = LENGTHEXTRABITS [CODE] BASE = LENGTHBASES [CODE] LENGTH = BASE + ReadLiteralBits (EXTRA) CODE = DecodeUsingDistanceTable () EXTRA = DISTANCEEXTRABITS [CODE] BASE = DISTANCEBASES [CODE] DISTANCE = BASE + ReadLiteralBits (EXTRA) CopyData (LENGTH, DISTANCE) End End End
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Compressed Data Format Until now we have dealt with the PNG compression from the top down Now we are going to back up and examine the ZLIB/Deflate compressed data format The structure of the compressed data is shown in Table 143 Notice that most of the fields are not complete bytes and that when used with PNG most have mandatory values The Compression Level field is an advisory field It gives a clue as to whether there may be any benefit in recompressing the data The value in the Check Bits field is used to ensure that the header value is a multiple of 31 A 2-byte header that is not evenly divisible by 31 is invalid The Adler-32 checksum serves the same function the CRC-32 does for PNG blocks The major difference is in how it is used The CRC-32 value for a PNG block is calculated using the bytes stored in the file The Adler-32 value for a compressed stream is calculated on the uncompressed bytes As each byte is decompressed, the decoder should update the Alder-32 value After all the data has been decompressed, a decoder should compare the Adler-32 calculated from the decompressed data with the value stored in the field If the two values are not the same, the decoder should assume that the data has been corrupted The following source code illustrates how to implement the Adler-32 checksum The UpdateAdler function updates the value in the AdlerRegister variable for each byte as it is decompressed The Adler register is initialized to 1
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Table 143 Compressed Data Format
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Field Name Header Compression Method Window Size Check Bits Preset Dictionary Compression Level
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Size 2 bytes 4 bits 4 bits 5 bits 1 bit 2 bits
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Description Must be 8 Must be 7 or less Makes the first 2 bytes a multiple of 31 Must be zero 0 Fastest compression used 1 Fast compression used 2 Default compression used 3 Maximum compression used Adler-32 Checksum calculated from the uncompressed data
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before calculating the checksum The Adler value stored in the file is the value of the Adler register after the last byte has been processed No modification needs to be made, as with CRC-32 unsigned long AdlerRegister = 1 ; const unsigned long PRIME = 65521L ; void UpdateAdler(unsigned char value) { unsigned long low = AdlerRegister & 0X0000FFFFL ; unsigned long high = (AdlerRegister >> 16) & 0X0000FFFFL ; low = (low + value) % PRIME ; high = (low + high) % PRIME ; AdlerRegister = (high << 16) | low ; }
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Compressed Data Blocks The compressed data can be divided into any number of compressed blocks It is possible for the encoder to compress the entire image into a single block, but in some cases using multiple blocks can improve compression Each block starts with a 3-bit header with the format shown in Table 144 The header specifies the method used to compress the block and if more blocks follow this one If the Final bit is set, the Adler-32 value follows this block
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Table 144 Compressed Block Header Format
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Field Name Final Type
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Size
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Description 1 This is the last compressed block 0 There are additional compressed blocks after this one 0 The data is uncompressed 1 Compressed with fixed Huffman codes 2 Compressed with dynamic Huffman codes 3 Invalid
1 bit
2 bits
Uncompressed Block Format If the Type field in the block header specifies that the data is uncompressed, the remaining data in the block is byte aligned Any unused bits following the header are discarded The format of an uncompressed data block is shown in Table 145 A decompressor simply copies the uncompressed bytes to the output stream Dynamic Huffman Codes Dynamic Huffman codes is the most useful compression method The bit fields shown in Table 146 immediately follow the compressed block header These values give the number of values that are actually used in the compressed data While two Huffman tables are used to decompress the data, there are three lengths defined here The reason for the extra field is that the code lengths for the length/literal and distance Huffman tables themselves are Huffman encoded The structure in Table 146 is followed by a sequence of up to 19 3-bit fields The actual number of bit fields is the value of the Lengths field plus 4 These bit fields contain the Huffman code lengths for the values 0-18 The lengths are stored in the order
16 17 18 0 8 7 9 6 10 5 11 4 12 3 13 2 14 1 15