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1 /* *****************************************************************************
2 ** Initial file written and documented by:
3 ** Kevin Shepherd <kshepherd@php.net> December 2007
4 ** of Scarlet Line http://www.scarletline.com/
5 *******************************************************************************/
6 /** \file gd_io_stream.h
7 \brief C++ standard library iostream specializations of gdIOCtx.
8
9 Note that all of the methods defined in this header are internal to the
10 libgd library, except for the constructors.
11 Only the constructors are needed by a user of the libgd API.
12 This file does not use or need gdpp.h, but if GD::Image is
13 used, then C++ coding becomes even simpler, and the classes below
14 become entirely hidden implementation details.
15 Example usage, convert png to gif:
16 #include <fstream>
17 #include "gd_io_stream.h"
18 std::ifstream in("image.png", std::ios_base::in | std::ios_base::binary );
19 if (in.good())
20 {
21 istreamIOCtx _in_ctx(in);
22 gdImagePtr im_in = gdImageCreateFromPngCtx ( & _in_ctx);
23 std::ofstream out("image.gif", std::ios_base::out | std::ios_base::binary );
24 ostreamIOCtx _out_ctx(out);
25 gdImageGifCtx(im_in, & _out_ctx);
26 }
27 gdImageDestroy(im_in);
28 */
29 #ifndef _gd_io_stream_h
30 #define _gd_io_stream_h
31 #ifdef __cplusplus
32
33 #include "gd.h"
34 #include <iostream>
35
36 /** Standard library input stream specialization of gdIOCtx
37 */
38 class BGD_EXPORT_DATA_IMPL istreamIOCtx : public gdIOCtx
39 {
40 public:
41 typedef std::istream stream_type;
42 /** Construct an instance of this input stream specialization,
43 given an input stream.
44 For example:
45 std::ifstream in("image.png", std::ios_base::in | std::ios_base::binary );
46 istreamIOCtx in_ctx(in);
47 */
48 istreamIOCtx(stream_type & __stream) {
49 init( & __stream);
50 }
51
52 static int Getbuf(gdIOCtxPtr ctx, void *buf, int size);
53 static int Putbuf(gdIOCtxPtr, const void *, int);
54 static void Putchar(gdIOCtxPtr, int);
55 static int Getchar(gdIOCtxPtr ctx);
56 static int Seek(gdIOCtxPtr ctx, const int pos);
57 static long Tell(gdIOCtxPtr ctx);
58 static void FreeCtx(gdIOCtxPtr ctx);
59
60 void init(stream_type * __stream) {
61 getC = Getchar;
62 putC = Putchar;
63 getBuf = Getbuf;
64 putBuf = Putbuf;
65 tell = Tell;
66 seek = Seek;
67 gd_free = FreeCtx;
68 _M_stream = __stream;
69 }
70 private:
71 stream_type * _M_stream;
72 };
73 /** Allocate a new instance of the class
74 */
75 inline gdIOCtxPtr gdNewIstreamCtx(std::istream *__stream)
76 {
77 return new istreamIOCtx(* __stream);
78 }
79
80 /** Standard library output stream specialization of gdIOCtx
81 */
82 class BGD_EXPORT_DATA_IMPL ostreamIOCtx : public gdIOCtx
83 {
84 public:
85 typedef std::ostream stream_type;
86 /** Construct an instance of this output stream specialization,
87 given an output stream.
88 For example:
89 std::ofstream out("image.gif", std::ios_base::out | std::ios_base::binary );
90 ostreamIOCtx out_ctx(out);
91 */
92 ostreamIOCtx(stream_type & __stream) {
93 init( & __stream);
94 }
95
96 static int Getbuf(gdIOCtxPtr, void *, int);
97 static int Putbuf(gdIOCtxPtr ctx, const void *buf, int size);
98 static int Getchar(gdIOCtxPtr);
99 static void Putchar(gdIOCtxPtr ctx, int a);
100 static int Seek(gdIOCtxPtr ctx, const int pos);
101 static long Tell(gdIOCtxPtr ctx);
102 static void FreeCtx(gdIOCtxPtr ctx);
103
104 void init(stream_type * __stream) {
105 getC = Getchar;
106 putC = Putchar;
107 getBuf = Getbuf;
108 putBuf = Putbuf;
109 tell = Tell;
110 seek = Seek;
111 gd_free = FreeCtx;
112 _M_stream = __stream;
113 }
114 private:
115 stream_type * _M_stream;
116 };
117 /** Allocate a new instance of the class
118 */
119 inline gdIOCtxPtr gdNewOstreamCtx(std::ostream *__stream)
120 {
121 return new ostreamIOCtx(* __stream);
122 }
123
124 #endif /* __cplusplus */
125 #endif /* _gd_io_stream_h */