@syncfusion/ej2-pdf/src/pdf/core/pdf-parser.d.ts

Feature-rich JavaScript PDF library with built-in support for loading and manipulating PDF document.

import { _PdfName, _PdfDictionary } from './pdf-primitives';
import { _PdfStream, _PdfBaseStream } from './base-stream';
import { _PdfCrossReference } from './pdf-cross-reference';
import { _PdfEncryptor } from './security/encryptor';
import { _CipherTransform } from './security/encryptors/cipher-tranform';
/**
 * Scans PDF byte streams and tokenizes them into primitive objects and commands.
 *
 * @private
 */
export declare class _PdfLexicalOperator {
    stream: any;
    stringBuffer: Array<string>;
    /**
     * Tracks the number of hex digits processed while reading a hex string.
     *
     * @private
     */
    _hexStringNumber: number;
    beginInlineImagePosition: number;
    currentChar: number;
    /**
     * Indicates whether the lexer operates in Forms Data Format (FDF) mode.
     *
     * @private
     */
    _isFormsDataFormat: boolean;
    /**
     * Indicates whether the lexer is operating in annotation import mode.
     *
     * @private
     */
    _isAnnotationImport: boolean;
    constructor(stream: any, isFormDataFormat?: boolean, isAnnotationImport?: boolean);
    nextChar(): number;
    peekChar(): number;
    getNumber(): number;
    getString(): string;
    getName(): _PdfName;
    getHexString(): string;
    getObject(): any;
    peekObj(): any;
    skipToNextLine(): void;
    /**
     * Converts an ASCII hex character code to its numeric value or -1 if invalid.
     *
     * @private
     * @param {number} ch Character code to convert.
     * @returns {number} Numeric value in the range 0 to 15, or -1 if not a hex digit.
     */
    _toHexDigit(ch: number): number;
}
/**
 * Parses PDF tokens into objects, arrays, dictionaries, streams, and inline images, including decryption and decoding.
 *
 * @private
 */
export declare class _PdfParser {
    lexicalOperator: _PdfLexicalOperator;
    xref: _PdfCrossReference;
    allowStreams: boolean;
    recoveryMode: boolean;
    imageCache: Map<string, _PdfBaseStream>;
    first: any;
    second: any;
    private _isColorSpace;
    private _isPassword;
    /**
     * Encryptor used to create cipher transforms for encrypted objects.
     *
     * @private
     */
    _encryptor: _PdfEncryptor;
    /**
     * Indicates whether parsing is performed for raw image extraction.
     *
     * @private
     */
    _isImageExtraction: boolean;
    constructor(lexicalOperator: _PdfLexicalOperator, xref: _PdfCrossReference, allowStreams?: boolean, recoveryMode?: boolean, encryptor?: _PdfEncryptor);
    refill(): void;
    shift(): void;
    tryShift(): boolean;
    getObject(cipherTransform?: _CipherTransform): any;
    getObject(objectNumber?: number, generationNumber?: number | boolean, isCipherTransform?: boolean): any;
    findDiscreteDecodeInlineStreamEnd(stream: any): number;
    findDecodeInlineStreamEnd(stream: any): number;
    findHexDecodeInlineStreamEnd(stream: any): number;
    inlineStreamSkipEI(stream: any): void;
    makeInlineImage(cipher?: _CipherTransform): any;
    makeInlineImage(objectNumber?: number, generationNumber?: number, isCipherTransform?: boolean): any;
    /**
     * Computes a lightweight checksum used as a cache key for byte arrays.
     *
     * @private
     * @param {Uint8Array} bytes Byte array to hash.
     * @returns {number} Computed checksum value.
     */
    _computeMaxNumber(bytes: Uint8Array): number;
    makeStream(dictionary: _PdfDictionary, cipherTransform?: _CipherTransform, makeFilter?: boolean): any;
    filter(stream: any, dictionary: _PdfDictionary, length: number): any;
    makeFilter(stream: any, name: string, maybeLength: number, params: any): any;
    /**
     * Searches forward from the given position to locate a signature and compute the stream length.
     *
     * @private
     * @param {number} startPosition Start position within the source stream.
     * @param {Uint8Array} signature Byte sequence that marks the end of the stream.
     * @returns {number} Length from the start position to the signature, or -1 if not found.
     */
    _findStreamLength(startPosition: number, signature: Uint8Array): number;
    findDefaultInlineStreamEnd(stream: any): number;
    /**
     * Determines whether the parser has reached the end-of-file token.
     *
     * @private
     * @returns {boolean} `true` if EOF is reached; otherwise, `false`.
     */
    _checkEnd(): boolean;
}
/**
 * Parses and validates the PDF Linearization dictionary and exposes linearization hints.
 *
 * @private
 */
export declare class _Linearization {
    length: number;
    xref: _PdfCrossReference;
    hints: number[];
    objectNumberFirst: number;
    endFirst: number;
    pageCount: number;
    mainXRefEntriesOffset: number;
    pageFirst: number;
    isValid: boolean;
    constructor(stream: _PdfStream);
    getInt(dictionary: _PdfDictionary, name: string, allowZeroValue?: boolean): number;
    getHints(dictionary: _PdfDictionary): number[];
}