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<?php |
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namespace Knik\Binn\Decoder; |
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use Knik\Binn\Binn; |
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abstract class Decoder |
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{ |
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protected function detectType(string $bytes): int |
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{ |
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if ($bytes === '') { |
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return Binn::BINN_NULL; |
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} |
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$type = Unpacker::unpackType8($bytes[0]); |
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if ($type & Binn::BINN_STORAGE_HAS_MORE) { |
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$typeBytes = substr($bytes, 0, 2); |
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$type = Unpacker::unpackType16($typeBytes); |
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} |
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return $type; |
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} |
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protected function readSizeWithType(string $bytes): int |
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{ |
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$type = ($this->detectType($bytes) & ~ Binn::BINN_TYPE_MASK); |
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switch ($type) { |
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case Binn::BINN_STORAGE_NOBYTES: |
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return 1; |
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case Binn::BINN_STORAGE_BYTE: |
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return 2; |
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case Binn::BINN_STORAGE_WORD: |
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return 3; |
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case Binn::BINN_STORAGE_DWORD: |
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return 5; |
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case Binn::BINN_STORAGE_QWORD: |
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return 9; |
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case Binn::BINN_STORAGE_STRING: |
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return $this->readSizeStringWithType($bytes); |
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case Binn::BINN_STORAGE_BLOB: |
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return $this->readSizeBlobWithType($bytes); |
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case Binn::BINN_STORAGE_CONTAINER: |
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return $this->readSizeContainerWithType($bytes); |
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} |
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return 0; |
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} |
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private function readSizeStringWithType(string $bytes): int |
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{ |
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// type, size size, string size, null terminator |
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return $this->readSizeBlobWithType($bytes) + 1; |
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} |
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private function readSizeBlobWithType(string $bytes): int |
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{ |
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$size = Unpacker::unpackSize8($bytes[1]); |
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$sizeSize = 1; |
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if ($size > Binn::BINN_MAX_ONE_BYTE_SIZE) { |
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$sizeBytes = substr($bytes, 1, 4); |
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$size = Unpacker::unpackSize32($sizeBytes); |
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$sizeSize = 4; |
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} |
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// type, size size, data size |
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return $size + $sizeSize + 1; |
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} |
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private function readSizeContainerWithType(string $bytes): int |
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{ |
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$size = Unpacker::unpackSize8($bytes[1]); |
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if ($size > Binn::BINN_MAX_ONE_BYTE_SIZE) { |
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$sizeBytes = substr($bytes, 1, 4); |
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$size = Unpacker::unpackSize32($sizeBytes); |
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} |
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return $size; |
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} |
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} |
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et-nik /
binn-php
