// Copyright 2012 The Obvious Corporation.

/*
 * bufs: Buffer utilities.
 */

/*
 * Module variables
 */

/** Pool of buffers, where `bufPool[x].length === x`. */
var bufPool = [];
/** Maximum length of kept temporary buffers. */

var TEMP_BUF_MAXIMUM_LENGTH = 20;
/** Minimum exactly-representable 64-bit int. */

var MIN_EXACT_INT64 = -0x8000000000000000;
/** Maximum exactly-representable 64-bit int. */

var MAX_EXACT_INT64 = 0x7ffffffffffffc00;
/** Maximum exactly-representable 64-bit uint. */

var MAX_EXACT_UINT64 = 0xfffffffffffff800;
/**
 * The int value consisting just of a 1 in bit #32 (that is, one more
 * than the maximum 32-bit unsigned value).
 */

var BIT_32 = 0x100000000;
/**
 * The int value consisting just of a 1 in bit #64 (that is, one more
 * than the maximum 64-bit unsigned value).
 */

var BIT_64 = 0x10000000000000000;
/*
 * Helper functions
 */

/**
 * Masks off all but the lowest bit set of the given number.
 */

function lowestBit(num) {
  return num & -num;
}
/**
 * Gets whether trying to add the second number to the first is lossy
 * (inexact). The first number is meant to be an accumulated result.
 */


function isLossyToAdd(accum, num) {
  if (num === 0) {
    return false;
  }

  var lowBit = lowestBit(num);
  var added = accum + lowBit;

  if (added === accum) {
    return true;
  }

  if (added - lowBit !== accum) {
    return true;
  }

  return false;
}
/*
 * Exported functions
 */

/**
 * Allocates a buffer of the given length, which is initialized
 * with all zeroes. This returns a buffer from the pool if it is
 * available, or a freshly-allocated buffer if not.
 */


export function alloc(length) {
  var result = bufPool[length];

  if (result) {
    bufPool[length] = undefined;
  } else {
    result = new Buffer(length);
  }

  result.fill(0);
  return result;
}
/**
 * Releases a buffer back to the pool.
 */

export function free(buffer) {
  var length = buffer.length;

  if (length < TEMP_BUF_MAXIMUM_LENGTH) {
    bufPool[length] = buffer;
  }
}
/**
 * Resizes a buffer, returning a new buffer. Returns the argument if
 * the length wouldn't actually change. This function is only safe to
 * use if the given buffer was allocated within this module (since
 * otherwise the buffer might possibly be shared externally).
 */

export function resize(buffer, length) {
  if (length === buffer.length) {
    return buffer;
  }

  var newBuf = alloc(length);
  buffer.copy(newBuf);
  free(buffer);
  return newBuf;
}
/**
 * Reads an arbitrary signed int from a buffer.
 */

export function readInt(buffer) {
  var length = buffer.length;
  var positive = buffer[length - 1] < 0x80;
  var result = positive ? 0 : -1;
  var lossy = false; // Note: We can't use bit manipulation here, since that stops
  // working if the result won't fit in a 32-bit int.

  if (length < 7) {
    // Common case which can't possibly be lossy (because the result has
    // no more than 48 bits, and loss only happens with 54 or more).
    for (var i = length - 1; i >= 0; i--) {
      result = result * 0x100 + buffer[i];
    }
  } else {
    for (var _i = length - 1; _i >= 0; _i--) {
      var one = buffer[_i];
      result *= 0x100;

      if (isLossyToAdd(result, one)) {
        lossy = true;
      }

      result += one;
    }
  }

  return {
    value: result,
    lossy: lossy
  };
}
/**
 * Reads an arbitrary unsigned int from a buffer.
 */

export function readUInt(buffer) {
  var length = buffer.length;
  var result = 0;
  var lossy = false; // Note: See above in re bit manipulation.

  if (length < 7) {
    // Common case which can't possibly be lossy (see above).
    for (var i = length - 1; i >= 0; i--) {
      result = result * 0x100 + buffer[i];
    }
  } else {
    for (var _i2 = length - 1; _i2 >= 0; _i2--) {
      var one = buffer[_i2];
      result *= 0x100;

      if (isLossyToAdd(result, one)) {
        lossy = true;
      }

      result += one;
    }
  }

  return {
    value: result,
    lossy: lossy
  };
}
/**
 * Writes a little-endian 64-bit signed int into a buffer.
 */

export function writeInt64(value, buffer) {
  if (value < MIN_EXACT_INT64 || value > MAX_EXACT_INT64) {
    throw new Error("Value out of range.");
  }

  if (value < 0) {
    value += BIT_64;
  }

  writeUInt64(value, buffer);
}
/**
 * Writes a little-endian 64-bit unsigned int into a buffer.
 */

export function writeUInt64(value, buffer) {
  if (value < 0 || value > MAX_EXACT_UINT64) {
    throw new Error("Value out of range.");
  }

  var lowWord = value % BIT_32;
  var highWord = Math.floor(value / BIT_32);
  buffer.writeUInt32LE(lowWord, 0);
  buffer.writeUInt32LE(highWord, 4);
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