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1.1 root 1: /****************************************************************************/
2: /* */
3: /* Microsoft Confidential */
4: /* */
5: /* Copyright (c) Microsoft Corp. 1987, 1991 */
6: /* All Rights Reserved */
7: /* */
8: /****************************************************************************/
9: /****************************** Module Header *******************************
10: * Module Name: rwpal.c
11: *
12: * Routines for reading and writing color palette files.
13: *
14: * History:
15: *
16: ****************************************************************************/
17:
18: #include "imagedit.h"
19:
20: #include <stdio.h>
21: #include <fcntl.h>
22: #include <io.h>
23: #include <sys\types.h> // For fstat() types.
24: #include <sys\stat.h> // For fstat() function.
25:
26:
27: /*
28: * The color palette is saved in a .PAL file. This file consists
29: * of a header followed by the colors.
30: *
31: * The header has the following format:
32: *
33: * struct {
34: * CHAR tag; // Always 'C'.
35: * WORD colors; // Number of colors. Always COLORSMAX.
36: * CHAR reserved[47]; // Reserved bytes.
37: * }
38: *
39: * Immediately following this is RGB quads for each of the colors in
40: * the palette.
41: */
42:
43:
44: /*
45: * Size in bytes of the header of a color palette file.
46: */
47: #define CBCOLORHDR (sizeof(CHAR) + sizeof(WORD) + 47)
48:
49: /*
50: * Size in bytes of the color information in the color file.
51: */
52: #define CBCOLORINFO (sizeof(DWORD) * COLORSMAX)
53:
54: /*
55: * Size in bytes of a color palette file. This includes the
56: * size of the header and room for all the colors.
57: */
58: #define CBCOLORFILE (CBCOLORHDR + CBCOLORINFO)
59:
60:
61:
62: /************************************************************************
63: * LoadColorFile
64: *
65: *
66: *
67: * Arguments:
68: *
69: * History:
70: *
71: ************************************************************************/
72:
73: VOID LoadColorFile(VOID)
74: {
75: HFILE hf;
76: OFSTRUCT OfStruct;
77: struct stat FileStatus;
78: DWORD argb[COLORSMAX];
79: UINT cbRead;
80: INT i;
81: CHAR tag;
82: CHAR szFileName[CCHMAXPATH];
83:
84: *szFileName = '\0';
85: if (!OpenDlg(szFileName, FT_PALETTE))
86: return;
87:
88: if ((hf = (HFILE)OpenFile(szFileName, (LPOFSTRUCT)&OfStruct, OF_READ))
89: == (HFILE)-1) {
90: Message(MSG_CANTOPEN, szFileName);
91: return;
92: }
93:
94: fstat((INT)_open_osfhandle((long)(hf), (int)(O_RDONLY)), &FileStatus);
95:
96: if (FileStatus.st_size != CBCOLORFILE) {
97: Message(MSG_BADPALFILE, szFileName);
98: goto Error1;
99: }
100:
101: if ((cbRead = _lread((HFILE)hf, &tag, 1)) == -1 || cbRead != 1) {
102: Message(MSG_READERROR, szFileName);
103: goto Error1;
104: }
105:
106: if (tag != 'C') {
107: Message(MSG_BADPALFILE, szFileName);
108: goto Error1;
109: }
110:
111: SetFilePointer((HANDLE)hf, CBCOLORHDR, NULL, (DWORD)0);
112: if ((cbRead = _lread((HFILE)hf, (LPSTR)argb, CBCOLORINFO)) == -1 ||
113: cbRead != CBCOLORINFO) {
114: Message(MSG_READERROR, szFileName);
115: goto Error1;
116: }
117:
118: for (i = 0; i < COLORSMAX; i++)
119: gargbColor[i] = argb[i];
120:
121: SetColorPalette(16, giType, TRUE);
122:
123: Error1:
124: _lclose((HFILE)hf);
125: }
126:
127:
128:
129: /************************************************************************
130: * SaveColorFile
131: *
132: *
133: *
134: * Arguments:
135: *
136: * History:
137: *
138: ************************************************************************/
139:
140: VOID SaveColorFile(VOID)
141: {
142: INT i;
143: HFILE hf;
144: OFSTRUCT OfStruct;
145: CHAR reserved[47];
146: WORD wColors = COLORSMAX;
147: CHAR tag = 'C';
148: CHAR szFileName[CCHMAXPATH];
149:
150: *szFileName = '\0';
151: if (!SaveAsDlg(szFileName, FT_PALETTE))
152: return;
153:
154: if ((hf = (HFILE)OpenFile(szFileName, &OfStruct,
155: OF_CREATE | OF_WRITE)) == (HFILE)-1) {
156: Message(MSG_CANTCREATE, szFileName);
157: return;
158: }
159:
160: for (i = 0; i < sizeof(reserved); i++)
161: reserved[i] = 0;
162:
163: if (_lwrite((HFILE)hf, (LPSTR)&tag, sizeof(tag)) != sizeof(tag) ||
164: _lwrite((HFILE)hf, (LPSTR)&wColors, sizeof(wColors)) !=
165: sizeof(wColors) ||
166: _lwrite((HFILE)hf, (LPSTR)reserved, sizeof(reserved)) !=
167: sizeof(reserved) ||
168: _lwrite((HFILE)hf, (LPSTR)gargbColor, CBCOLORINFO) != CBCOLORINFO) {
169: Message(MSG_WRITEERROR, szFileName);
170: }
171:
172: _lclose((HFILE)hf);
173: }
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