mirror of https://github.com/fltk/fltk.git
Matthias Melcher
5 years ago
16 changed files with 379 additions and 306 deletions
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//
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// Internal (Image) Reader class for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 2020 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// https://www.fltk.org/str.php
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//
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//
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// Include necessary header files...
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//
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#include "Fl_Image_Reader.h" |
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#include <FL/fl_utf8.h> |
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#include <stdlib.h> |
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#include <string.h> |
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/*
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This internal (undocumented) class reads data chunks from a file or from |
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memory in LSB-first byte order. |
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This class is used in Fl_GIF_Image and Fl_BMP_Image to avoid code |
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duplication and may be extended to be used in similar cases. Future |
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options might be to read data in MSB-first byte order or to add more |
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methods. |
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*/ |
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// Initialize the reader to access the file system, filename is copied
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// and stored.
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int Fl_Image_Reader::open(const char *filename) { |
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if (!filename) |
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return -1; |
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pName = strdup(filename); |
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if ( (pFile = fl_fopen(filename, "rb")) == NULL ) { |
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return -1; |
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} |
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pIsFile = 1; |
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return 0; |
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} |
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// Initialize the reader for memory access, name is copied and stored
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int Fl_Image_Reader::open(const char *imagename, const unsigned char *data) { |
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if (imagename) |
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pName = strdup(imagename); |
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if (data) { |
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pStart = pData = data; |
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pIsData = 1; |
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return 0; |
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} else { |
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return -1; |
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} |
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} |
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// Close and destroy the reader
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Fl_Image_Reader::~Fl_Image_Reader() { |
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if (pIsFile && pFile) { |
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fclose(pFile); |
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} |
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if (pName) |
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::free(pName); |
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} |
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// Read a single byte from memory or a file
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uchar Fl_Image_Reader::read_byte() { |
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if (pIsFile) { |
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return getc(pFile); |
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} else if (pIsData) { |
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return *pData++; |
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} else { |
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return 0; |
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} |
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} |
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// Read a 16-bit unsigned integer, LSB-first
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unsigned short Fl_Image_Reader::read_word() { |
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unsigned char b0, b1; // Bytes from file
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if (pIsFile) { |
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b0 = (uchar)getc(pFile); |
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b1 = (uchar)getc(pFile); |
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return ((b1 << 8) | b0); |
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} else if (pIsData) { |
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b0 = *pData++; |
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b1 = *pData++; |
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return ((b1 << 8) | b0); |
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} else { |
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return 0; |
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} |
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} |
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// Read a 32-bit unsigned integer, LSB-first
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unsigned int Fl_Image_Reader::read_dword() { |
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unsigned char b0, b1, b2, b3; // Bytes from file
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if (pIsFile) { |
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b0 = (uchar)getc(pFile); |
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b1 = (uchar)getc(pFile); |
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b2 = (uchar)getc(pFile); |
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b3 = (uchar)getc(pFile); |
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return ((((((b3 << 8) | b2) << 8) | b1) << 8) | b0); |
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} else if (pIsData) { |
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b0 = *pData++; |
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b1 = *pData++; |
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b2 = *pData++; |
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b3 = *pData++; |
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return ((((((b3 << 8) | b2) << 8) | b1) << 8) | b0); |
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} else { |
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return 0; |
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} |
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} |
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// Read a 32-bit signed integer, LSB-first
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// int Fl_Image_Reader::read_long() -- implementation in header file
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// Move the current read position to a byte offset from the beginning
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// of the file or the original start address in memory
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void Fl_Image_Reader::seek(unsigned int n) { |
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if (pIsFile) { |
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fseek(pFile, n , SEEK_SET); |
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} else if (pIsData) { |
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pData = pStart + n; |
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} |
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} |
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@ -0,0 +1,90 @@ |
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//
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// Internal (Image) Reader class for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 2020 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems on the following page:
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//
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// https://www.fltk.org/str.php
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//
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/*
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This internal (undocumented) class reads data chunks from a file or from |
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memory in LSB-first byte order. |
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This class is used in Fl_GIF_Image and Fl_BMP_Image to avoid code |
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duplication and may be extended to be used in similar cases. Future |
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options might be to read data in MSB-first byte order or to add more |
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methods. |
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*/ |
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#ifndef FL_IMAGE_READER_H |
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#define FL_IMAGE_READER_H |
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#include <stdio.h> |
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class Fl_Image_Reader |
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{ |
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public: |
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// Create the reader.
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Fl_Image_Reader() : |
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pIsFile(0), pIsData(0), |
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pFile(0L), pData(0L), |
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pStart(0L), |
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pName(0L) |
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{} |
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// Initialize the reader to access the file system, filename is copied
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// and stored.
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int open(const char *filename); |
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// Initialize the reader for memory access, name is copied and stored
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int open(const char *imagename, const unsigned char *data); |
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// Close and destroy the reader
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~Fl_Image_Reader(); |
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// Read a single byte from memory or a file
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unsigned char read_byte(); |
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// Read a 16-bit unsigned integer, LSB-first
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unsigned short read_word(); |
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// Read a 32-bit unsigned integer, LSB-first
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unsigned int read_dword(); |
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// Read a 32-bit signed integer, LSB-first
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int read_long() { |
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return (int)read_dword(); |
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}; |
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// Move the current read position to a byte offset from the beginning
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// of the file or the original start address in memory
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void seek(unsigned int n); |
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// return the name or filename for this reader
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const char *name() { return pName; } |
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private: |
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// open() sets this if we read from a file
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char pIsFile; |
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// open() sets this if we read from memory
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char pIsData; |
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// a pointer to the opened file
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FILE *pFile; |
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// a pointer to the current byte in memory
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const unsigned char *pData; |
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// a pointer to the start of the image data
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const unsigned char *pStart; |
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// a copy of the name associated with this reader
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char *pName; |
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}; |
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#endif // FL_IMAGE_READER_H
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