ArrayIndexOutOfBoundsException when trying to decode Base64

Asked May 12 '16 at 23:33

Active May 12 '16 at 23:33

Viewed 1,196 times

I am trying to decode a Base64 encoded string in Android. The string is 751 bytes long.

byte[] b = Base64.decodeBase64(b_b64);

I am using org.apache.commons.codec.binary.Base64 library for the function.

But I am getting the following exception.

Caused by: java.lang.ArrayIndexOutOfBoundsException: length=255; index=-65
at org.apache.commons.codec.binary.Base64.isBase64(Base64.java:142)
at org.apache.commons.codec.binary.Base64.discardNonBase64(Base64.java:483)
at org.apache.commons.codec.binary.Base64.decodeBase64(Base64.java:379)

What am I missing ?

asked May 12 '16 at 23:33

jgm

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Just a guess, but `index=-65` looks suspicious. – RaminS May 12 '16 at 23:36
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Not enough information: how did you instantiate `Base64` object (what parameters did you pass to the contractor?), what is `b_b64` ? – Nir Alfasi May 12 '16 at 23:38
@Gendarme I didn’t get you. What is wrong ? – jgm May 12 '16 at 23:38
@alfasin `b_b64` Its the base encoded string. – jgm May 12 '16 at 23:40
A negative index. I have never seen such a thing before. – RaminS May 12 '16 at 23:41
Again, that's not enough information... – Nir Alfasi May 12 '16 at 23:41
How did you obtain this string? Please include the relevent code. – Tim Biegeleisen May 12 '16 at 23:41
@alfasin Let me check it. – jgm May 12 '16 at 23:46
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@jgm the string that you're passing is not base64 so it cannot be decode as such, the exception is thrown from the check `isBase64()` - which you can see in the stacktrace. – Nir Alfasi May 12 '16 at 23:48
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Pipe the string into `base64 -d`, see what error pops out. – Andy Turner May 12 '16 at 23:50

ArrayIndexOutOfBoundsException when trying to decode Base64

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