import * as util from '../util';
/**
 * Wraps a list of ArrayBuffers into a `slice()`-able object without allocating
 * a large ArrayBuffer.
 *
 * Allocating large ArrayBuffers (~2GB) can be unstable on Chrome. TFJS loads
 * its weights as a list of (usually) 4MB ArrayBuffers and then slices the
 * weight tensors out of them. For small models, it's safe to concatenate all
 * the weight buffers into a single ArrayBuffer and then slice the weight
 * tensors out of it, but for large models, a different approach is needed.
 */
export class CompositeArrayBuffer {
    /**
     * Concatenate a number of ArrayBuffers into one.
     *
     * @param buffers An array of ArrayBuffers to concatenate, or a single
     *     ArrayBuffer.
     * @returns Result of concatenating `buffers` in order.
     */
    static join(buffers) {
        return new CompositeArrayBuffer(buffers).slice();
    }
    constructor(buffers) {
        this.shards = [];
        this.previousShardIndex = 0;
        if (buffers == null) {
            return;
        }
        // Normalize the `buffers` input to be `ArrayBuffer[]`.
        if (!(buffers instanceof Array)) {
            buffers = [buffers];
        }
        buffers = buffers.map((bufferOrTypedArray) => {
            if (util.isTypedArray(bufferOrTypedArray)) {
                return bufferOrTypedArray.buffer;
            }
            return bufferOrTypedArray;
        });
        // Skip setting up shards if there are no buffers.
        if (buffers.length === 0) {
            return;
        }
        this.bufferUniformSize = buffers[0].byteLength;
        let start = 0;
        for (let i = 0; i < buffers.length; i++) {
            const buffer = buffers[i];
            // Check that all buffers except the last one have the same length.
            if (i !== buffers.length - 1 &&
                buffer.byteLength !== this.bufferUniformSize) {
                // Unset the buffer uniform size, since the buffer sizes are not
                // uniform.
                this.bufferUniformSize = undefined;
            }
            // Create the shards, including their start and end points.
            const end = start + buffer.byteLength;
            this.shards.push({ buffer, start, end });
            start = end;
        }
        // Set the byteLenghth
        if (this.shards.length === 0) {
            this.byteLength = 0;
        }
        this.byteLength = this.shards[this.shards.length - 1].end;
    }
    slice(start = 0, end = this.byteLength) {
        // If there are no shards, then the CompositeArrayBuffer was initialized
        // with no data.
        if (this.shards.length === 0) {
            return new ArrayBuffer(0);
        }
        // NaN is treated as zero for slicing. This matches ArrayBuffer's behavior.
        start = isNaN(Number(start)) ? 0 : start;
        end = isNaN(Number(end)) ? 0 : end;
        // Fix the bounds to within the array.
        start = Math.max(0, start);
        end = Math.min(this.byteLength, end);
        if (end <= start) {
            return new ArrayBuffer(0);
        }
        const startShardIndex = this.findShardForByte(start);
        if (startShardIndex === -1) {
            // This should not happen since the start and end indices are always
            // within 0 and the composite array's length.
            throw new Error(`Could not find start shard for byte ${start}`);
        }
        const size = end - start;
        const outputBuffer = new ArrayBuffer(size);
        const outputArray = new Uint8Array(outputBuffer);
        let sliced = 0;
        for (let i = startShardIndex; i < this.shards.length; i++) {
            const shard = this.shards[i];
            const globalStart = start + sliced;
            const localStart = globalStart - shard.start;
            const outputStart = sliced;
            const globalEnd = Math.min(end, shard.end);
            const localEnd = globalEnd - shard.start;
            const outputSlice = new Uint8Array(shard.buffer, localStart, localEnd - localStart);
            outputArray.set(outputSlice, outputStart);
            sliced += outputSlice.length;
            if (end < shard.end) {
                break;
            }
        }
        return outputBuffer;
    }
    /**
     * Get the index of the shard that contains the byte at `byteIndex`.
     */
    findShardForByte(byteIndex) {
        if (this.shards.length === 0 || byteIndex < 0 ||
            byteIndex >= this.byteLength) {
            return -1;
        }
        // If the buffers have a uniform size, compute the shard directly.
        if (this.bufferUniformSize != null) {
            this.previousShardIndex = Math.floor(byteIndex / this.bufferUniformSize);
            return this.previousShardIndex;
        }
        // If the buffers don't have a uniform size, we need to search for the
        // shard. That means we need a function to check where the byteIndex lies
        // relative to a given shard.
        function check(shard) {
            if (byteIndex < shard.start) {
                return -1;
            }
            if (byteIndex >= shard.end) {
                return 1;
            }
            return 0;
        }
        // For efficiency, try the previous shard first.
        if (check(this.shards[this.previousShardIndex]) === 0) {
            return this.previousShardIndex;
        }
        // Otherwise, use a generic search function.
        // This should almost never end up being used in practice since the weight
        // entries should always be in order.
        const index = search(this.shards, check);
        if (index === -1) {
            return -1;
        }
        this.previousShardIndex = index;
        return this.previousShardIndex;
    }
}
/**
 * Search for an element of a sorted array.
 *
 * @param sortedArray The sorted array to search
 * @param compare A function to compare the current value against the searched
 *     value. Return 0 on a match, negative if the searched value is less than
 *     the value passed to the function, and positive if the searched value is
 *     greater than the value passed to the function.
 * @returns The index of the element, or -1 if it's not in the array.
 */
export function search(sortedArray, compare) {
    // Binary search
    let min = 0;
    let max = sortedArray.length;
    while (min <= max) {
        const middle = Math.floor((max - min) / 2) + min;
        const side = compare(sortedArray[middle]);
        if (side === 0) {
            return middle;
        }
        else if (side < 0) {
            max = middle;
        }
        else {
            min = middle + 1;
        }
    }
    return -1;
}
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All Rights Reserved.\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n * =============================================================================\n */\nimport {TypedArray} from '../types';\nimport * as util from '../util';\n\ntype BufferShard = {\n  start: number,\n  end: number,\n  buffer: ArrayBuffer,\n};\n\n/**\n * Wraps a list of ArrayBuffers into a `slice()`-able object without allocating\n * a large ArrayBuffer.\n *\n * Allocating large ArrayBuffers (~2GB) can be unstable on Chrome. TFJS loads\n * its weights as a list of (usually) 4MB ArrayBuffers and then slices the\n * weight tensors out of them. For small models, it's safe to concatenate all\n * the weight buffers into a single ArrayBuffer and then slice the weight\n * tensors out of it, but for large models, a different approach is needed.\n */\n\nexport class CompositeArrayBuffer {\n  private shards: BufferShard[] = [];\n  private previousShardIndex = 0;\n  private bufferUniformSize?: number;\n  public readonly byteLength: number;\n\n  /**\n   * Concatenate a number of ArrayBuffers into one.\n   *\n   * @param buffers An array of ArrayBuffers to concatenate, or a single\n   *     ArrayBuffer.\n   * @returns Result of concatenating `buffers` in order.\n   */\n  static join(buffers?: ArrayBuffer[] | ArrayBuffer) {\n    return new CompositeArrayBuffer(buffers).slice();\n  }\n\n  constructor(buffers?: ArrayBuffer | ArrayBuffer[] | TypedArray |\n    TypedArray[]) {\n    if (buffers == null) {\n      return;\n    }\n    // Normalize the `buffers` input to be `ArrayBuffer[]`.\n    if (!(buffers instanceof Array)) {\n      buffers = [buffers];\n    }\n    buffers = buffers.map((bufferOrTypedArray) => {\n      if (util.isTypedArray(bufferOrTypedArray)) {\n        return bufferOrTypedArray.buffer;\n      }\n      return bufferOrTypedArray;\n    });\n\n    // Skip setting up shards if there are no buffers.\n    if (buffers.length === 0) {\n      return;\n    }\n\n    this.bufferUniformSize = buffers[0].byteLength;\n    let start = 0;\n\n    for (let i = 0; i < buffers.length; i++) {\n      const buffer = buffers[i];\n      // Check that all buffers except the last one have the same length.\n      if (i !== buffers.length - 1 &&\n        buffer.byteLength !== this.bufferUniformSize) {\n        // Unset the buffer uniform size, since the buffer sizes are not\n        // uniform.\n        this.bufferUniformSize = undefined;\n      }\n\n      // Create the shards, including their start and end points.\n      const end = start + buffer.byteLength;\n      this.shards.push({ buffer, start, end });\n      start = end;\n    }\n\n    // Set the byteLenghth\n    if (this.shards.length === 0) {\n      this.byteLength = 0;\n    }\n    this.byteLength = this.shards[this.shards.length - 1].end;\n  }\n\n  slice(start = 0, end = this.byteLength): ArrayBuffer {\n    // If there are no shards, then the CompositeArrayBuffer was initialized\n    // with no data.\n    if (this.shards.length === 0) {\n      return new ArrayBuffer(0);\n    }\n\n    // NaN is treated as zero for slicing. This matches ArrayBuffer's behavior.\n    start = isNaN(Number(start)) ? 0 : start;\n    end = isNaN(Number(end)) ? 0 : end;\n\n    // Fix the bounds to within the array.\n    start = Math.max(0, start);\n    end = Math.min(this.byteLength, end);\n    if (end <= start) {\n      return new ArrayBuffer(0);\n    }\n\n    const startShardIndex = this.findShardForByte(start);\n    if (startShardIndex === -1) {\n      // This should not happen since the start and end indices are always\n      // within 0 and the composite array's length.\n      throw new Error(`Could not find start shard for byte ${start}`);\n    }\n\n    const size = end - start;\n    const outputBuffer = new ArrayBuffer(size);\n    const outputArray = new Uint8Array(outputBuffer);\n    let sliced = 0;\n    for (let i = startShardIndex; i < this.shards.length; i++) {\n      const shard = this.shards[i];\n\n      const globalStart = start + sliced;\n      const localStart = globalStart - shard.start;\n      const outputStart = sliced;\n\n      const globalEnd = Math.min(end, shard.end);\n      const localEnd = globalEnd - shard.start;\n\n      const outputSlice = new Uint8Array(shard.buffer, localStart,\n                                         localEnd - localStart);\n      outputArray.set(outputSlice, outputStart);\n      sliced += outputSlice.length;\n\n      if (end < shard.end) {\n        break;\n      }\n    }\n    return outputBuffer;\n  }\n\n  /**\n   * Get the index of the shard that contains the byte at `byteIndex`.\n   */\n  private findShardForByte(byteIndex: number): number {\n    if (this.shards.length === 0 || byteIndex < 0 ||\n      byteIndex >= this.byteLength) {\n      return -1;\n    }\n\n    // If the buffers have a uniform size, compute the shard directly.\n    if (this.bufferUniformSize != null) {\n      this.previousShardIndex = Math.floor(byteIndex / this.bufferUniformSize);\n      return this.previousShardIndex;\n    }\n\n    // If the buffers don't have a uniform size, we need to search for the\n    // shard. That means we need a function to check where the byteIndex lies\n    // relative to a given shard.\n    function check(shard: BufferShard) {\n      if (byteIndex < shard.start) {\n        return -1;\n      }\n      if (byteIndex >= shard.end) {\n        return 1;\n      }\n      return 0;\n    }\n\n    // For efficiency, try the previous shard first.\n    if (check(this.shards[this.previousShardIndex]) === 0) {\n      return this.previousShardIndex;\n    }\n\n    // Otherwise, use a generic search function.\n    // This should almost never end up being used in practice since the weight\n    // entries should always be in order.\n    const index = search(this.shards, check);\n    if (index === -1) {\n      return -1;\n    }\n\n    this.previousShardIndex = index;\n    return this.previousShardIndex;\n  }\n}\n\n/**\n * Search for an element of a sorted array.\n *\n * @param sortedArray The sorted array to search\n * @param compare A function to compare the current value against the searched\n *     value. Return 0 on a match, negative if the searched value is less than\n *     the value passed to the function, and positive if the searched value is\n *     greater than the value passed to the function.\n * @returns The index of the element, or -1 if it's not in the array.\n */\nexport function search<T>(sortedArray: T[], compare: (t: T) => number): number {\n  // Binary search\n  let min = 0;\n  let max = sortedArray.length;\n\n  while (min <= max) {\n    const middle = Math.floor((max - min) / 2) + min;\n    const side = compare(sortedArray[middle]);\n\n    if (side === 0) {\n      return middle;\n    } else if (side < 0) {\n      max = middle;\n    } else {\n      min = middle + 1;\n    }\n  }\n  return -1;\n}\n"]}