mirror of
https://github.com/michaelrsweet/pdfio.git
synced 2024-07-01 11:09:50 +02:00
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
|
//
|
|||
|
|
// PDF token parsing functions for pdfio.
|
|||
|
|
//
|
|||
|
|
// Copyright © 2021 by Michael R Sweet.
|
|||
|
|
//
|
|||
|
|
// Licensed under Apache License v2.0. See the file "LICENSE" for more
|
|||
|
|
// information.
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// Include necessary headers...
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
#include "pdfio-private.h"
|
|||
|
|
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// This file parses PDF language syntax:
|
|||
|
|
//
|
|||
|
|
// << dict >> "<<" and ">>" delimit a dictionary
|
|||
|
|
// (string) "(" and ")" delimit a string
|
|||
|
|
// [array] "[" and "]" delimit an array
|
|||
|
|
// <hex-string> "<" and ">" delimit a hex string
|
|||
|
|
// {...} "{" and "}" delimit ???
|
|||
|
|
// /name "/" starts a name with any special characters
|
|||
|
|
// quoted as "#HH" where HH is the byte value in hex.
|
|||
|
|
// %comment "%" starts a comment to the end of a line
|
|||
|
|
// keyword A keyword consists of upper/lowercase letters
|
|||
|
|
// [-+]?[0-9]*(.[0-9]*)? A number optionally starts with "+" or "-".
|
|||
|
|
//
|
|||
|
|
// Newlines are CR, LF, or CR LF.
|
|||
|
|
//
|
|||
|
|
// Strings and names are returned with the leading delimiter ("(string",
|
|||
|
|
// "<hex-string", "/name") and all escaping/whitespace removal resolved.
|
|||
|
|
// Other delimiters, keywords, and numbers are returned as-is.
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
|
|||
|
|
//
|
|||
|
|
// '_pdfioTokenRead()' - Read a token from a file/stream.
|
|||
|
|
//
|
|||
|
|
|
|||
|
|
bool // O - `true` on success, `false` on failure
|
|||
|
|
_pdfioTokenRead(
|
|||
|
|
char *buffer, // I - String buffer
|
|||
|
|
size_t bufsize, // I - Size of string buffer
|
|||
|
|
_pdfio_token_cb_t peek_cb, // I - "peek" callback
|
|||
|
|
_pdfio_token_cb_t read_cb, // I - "read" callback
|
|||
|
|
void *data) // I - Callback data
|
|||
|
|
{
|
|||
|
|
char *bufptr, // Pointer into buffer
|
|||
|
|
*bufend, // End of buffer
|
|||
|
|
temp[256], // Temporary buffer
|
|||
|
|
*tempptr, // Pointer into temporary buffer
|
|||
|
|
*tempend; // End of temporary buffer
|
|||
|
|
ssize_t bytes; // Bytes read/peeked
|
|||
|
|
size_t len; // Length of value
|
|||
|
|
|
|||
|
|
|
|||
|
|
return (false);
|
|||
|
|
}
|
|||
|
|
|