com.upokecenter.cbor.CharacterInputWithCount Maven / Gradle / Ivy

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A Java implementation of Concise Binary Object Representation (CBOR), a general-purpose binary data format defined in RFC 7049.

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package com.upokecenter.cbor;

import com.upokecenter.util.*;
import com.upokecenter.numbers.*;

  class CharacterInputWithCount implements ICharacterInput {
    private final ICharacterInput ci;
    private int offset;

    public CharacterInputWithCount(ICharacterInput ci) {
      this.ci = ci;
    }

    public int GetOffset() {
      return this.offset;
    }

    public void RaiseError(String str) {
      throw new CBORException(this.NewErrorString(str));
    }

    public int Read(int[] chars, int index, int length) {
      if (chars == null) {
        throw new NullPointerException("chars");
      }
      if (index < 0) {
        throw new IllegalArgumentException("index (" + index +
          ") is less than 0");
      }
      if (index > chars.length) {
        throw new IllegalArgumentException("index (" + index +
          ") is more than " + chars.length);
      }
      if (length < 0) {
        throw new IllegalArgumentException("length (" + length +
          ") is less than 0");
      }
      if (length > chars.length) {
        throw new IllegalArgumentException("length (" + length +
          ") is more than " + chars.length);
      }
      if (chars.length - index < length) {
        throw new IllegalArgumentException("chars's length minus " + index + " (" +
          (chars.length - index) + ") is less than " + length);
      }
      int ret = this.ci.Read(chars, index, length);
      if (ret > 0) {
        this.offset += ret;
      }
      return ret;
    }

    public int ReadChar() {
      int c = -1;
      try {
        c = this.ci.ReadChar();
      } catch (IllegalStateException ex) {
        if (ex.getCause() == null) {
          throw new CBORException(
  this.NewErrorString(ex.getMessage()),
  ex);
        } else {
          throw new CBORException(
  this.NewErrorString(ex.getMessage()),
  ex.getCause());
        }
      }
      if (c >= 0) {
        ++this.offset;
      }
      return c;
    }

    private String NewErrorString(String str) {
      return str + " (offset " + this.GetOffset() + ")";
    }
  }