snappy_fuzz.go

// +build gofuzz

package snappy

import (
        "bytes"
)

func Fuzz(data []byte) int {

        src := data

        dLen, s, err := decodedLen(src)
        if err != nil {
                return 0
        }

        if dLen > 1e6 || dLen <= 0 {
                return 0
        }

        dstGo := make([]byte, dLen)
        decGo := decode_go(dstGo, src[s:])
        dstAsm := make([]byte, dLen+10)

        for i := 0; i < dLen+10; i++ {
                dstAsm[i] = 0xff
        }

        decAsm := decode_asm(dstAsm[:dLen], src[s:])

        if decGo != decAsm {
                panic("behaviour mismatch")
        }

        if decGo != 0 {
                return 0
        }

        if !bytes.Equal(dstGo, dstAsm[:dLen]) {
                panic("output mismatch")
        }

        for i := 0; i < 10; i++ {
                if dstAsm[dLen+i] != 0xff {
                        panic("buffer overwrite")
                }
        }

        return 1
}