519 lines
14 KiB
C
519 lines
14 KiB
C
/*
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* Copyright © 2002 Keith Packard
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#define _DEFAULT_SOURCE
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#include "xcursor.h"
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#include <dirent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* From libXcursor/include/X11/extensions/Xcursor.h
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*/
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#define XcursorTrue 1
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#define XcursorFalse 0
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/*
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* Cursor files start with a header. The header
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* contains a magic number, a version number and a
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* table of contents which has type and offset information
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* for the remaining tables in the file.
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*
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* File minor versions increment for compatible changes
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* File major versions increment for incompatible changes (never, we hope)
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*
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* Chunks of the same type are always upward compatible. Incompatible
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* changes are made with new chunk types; the old data can remain under
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* the old type. Upward compatible changes can add header data as the
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* header lengths are specified in the file.
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*
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* File:
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* FileHeader
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* LISTofChunk
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*
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* FileHeader:
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* CARD32 magic magic number
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* CARD32 header bytes in file header
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* CARD32 version file version
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* CARD32 ntoc number of toc entries
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* LISTofFileToc toc table of contents
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*
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* FileToc:
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* CARD32 type entry type
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* CARD32 subtype entry subtype (size for images)
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* CARD32 position absolute file position
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*/
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#define XCURSOR_MAGIC 0x72756358 /* "Xcur" LSBFirst */
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/*
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* Current Xcursor version number. Will be substituted by configure
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* from the version in the libXcursor configure.ac file.
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*/
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#define XCURSOR_LIB_MAJOR 1
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#define XCURSOR_LIB_MINOR 1
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#define XCURSOR_LIB_REVISION 13
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#define XCURSOR_LIB_VERSION ((XCURSOR_LIB_MAJOR * 10000) + (XCURSOR_LIB_MINOR * 100) + (XCURSOR_LIB_REVISION))
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/*
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* This version number is stored in cursor files; changes to the
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* file format require updating this version number
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*/
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#define XCURSOR_FILE_MAJOR 1
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#define XCURSOR_FILE_MINOR 0
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#define XCURSOR_FILE_VERSION ((XCURSOR_FILE_MAJOR << 16) | (XCURSOR_FILE_MINOR))
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#define XCURSOR_FILE_HEADER_LEN (4 * 4)
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#define XCURSOR_FILE_TOC_LEN (3 * 4)
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typedef struct _XcursorFileToc
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{
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XcursorUInt type; /* chunk type */
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XcursorUInt subtype; /* subtype (size for images) */
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XcursorUInt position; /* absolute position in file */
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} XcursorFileToc;
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typedef struct _XcursorFileHeader
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{
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XcursorUInt magic; /* magic number */
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XcursorUInt header; /* byte length of header */
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XcursorUInt version; /* file version number */
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XcursorUInt ntoc; /* number of toc entries */
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XcursorFileToc *tocs; /* table of contents */
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} XcursorFileHeader;
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/*
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* The rest of the file is a list of chunks, each tagged by type
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* and version.
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*
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* Chunk:
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* ChunkHeader
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* <extra type-specific header fields>
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* <type-specific data>
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*
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* ChunkHeader:
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* CARD32 header bytes in chunk header + type header
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* CARD32 type chunk type
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* CARD32 subtype chunk subtype
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* CARD32 version chunk type version
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*/
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#define XCURSOR_CHUNK_HEADER_LEN (4 * 4)
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typedef struct _XcursorChunkHeader
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{
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XcursorUInt header; /* bytes in chunk header */
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XcursorUInt type; /* chunk type */
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XcursorUInt subtype; /* chunk subtype (size for images) */
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XcursorUInt version; /* version of this type */
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} XcursorChunkHeader;
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/*
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* Here's a list of the known chunk types
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*/
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/*
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* Comments consist of a 4-byte length field followed by
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* UTF-8 encoded text
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*
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* Comment:
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* ChunkHeader header chunk header
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* CARD32 length bytes in text
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* LISTofCARD8 text UTF-8 encoded text
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*/
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#define XCURSOR_COMMENT_TYPE 0xfffe0001
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#define XCURSOR_COMMENT_VERSION 1
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#define XCURSOR_COMMENT_HEADER_LEN (XCURSOR_CHUNK_HEADER_LEN + (1 * 4))
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#define XCURSOR_COMMENT_COPYRIGHT 1
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#define XCURSOR_COMMENT_LICENSE 2
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#define XCURSOR_COMMENT_OTHER 3
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#define XCURSOR_COMMENT_MAX_LEN 0x100000
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typedef struct _XcursorComment
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{
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XcursorUInt version;
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XcursorUInt comment_type;
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char *comment;
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} XcursorComment;
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/*
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* Each cursor image occupies a separate image chunk.
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* The length of the image header follows the chunk header
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* so that future versions can extend the header without
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* breaking older applications
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*
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* Image:
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* ChunkHeader header chunk header
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* CARD32 width actual width
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* CARD32 height actual height
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* CARD32 xhot hot spot x
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* CARD32 yhot hot spot y
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* CARD32 delay animation delay
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* LISTofCARD32 pixels ARGB pixels
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*/
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#define XCURSOR_IMAGE_TYPE 0xfffd0002
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#define XCURSOR_IMAGE_VERSION 1
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#define XCURSOR_IMAGE_HEADER_LEN (XCURSOR_CHUNK_HEADER_LEN + (5 * 4))
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#define XCURSOR_IMAGE_MAX_SIZE 0x7fff /* 32767x32767 max cursor size */
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typedef struct _XcursorComments
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{
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int ncomment; /* number of comments */
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XcursorComment **comments; /* array of XcursorComment pointers */
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} XcursorComments;
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/*
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* From libXcursor/src/file.c
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*/
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static XcursorImage *
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XcursorImageCreate(int width, int height)
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{
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XcursorImage *image;
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if (width < 0 || height < 0)
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return NULL;
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if (width > XCURSOR_IMAGE_MAX_SIZE || height > XCURSOR_IMAGE_MAX_SIZE)
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return NULL;
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image = malloc(sizeof(XcursorImage) + width * height * sizeof(XcursorPixel));
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if (!image)
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return NULL;
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image->version = XCURSOR_IMAGE_VERSION;
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image->pixels = (XcursorPixel *)(image + 1);
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image->size = width > height ? width : height;
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image->width = width;
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image->height = height;
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image->delay = 0;
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return image;
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}
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static void
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XcursorImageDestroy(XcursorImage *image)
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{
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free(image);
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}
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static XcursorImages *
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XcursorImagesCreate(int size)
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{
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XcursorImages *images;
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images = malloc(sizeof(XcursorImages) + size * sizeof(XcursorImage *));
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if (!images)
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return NULL;
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images->nimage = 0;
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images->images = (XcursorImage **)(images + 1);
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return images;
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}
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void XcursorImagesDestroy(XcursorImages *images)
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{
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int n;
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if (!images)
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return;
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for (n = 0; n < images->nimage; n++)
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XcursorImageDestroy(images->images[n]);
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free(images);
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}
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static XcursorBool
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_XcursorReadUInt(XcursorFile *file, XcursorUInt *u)
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{
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uint8_t bytes[4];
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if (!file || !u)
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return XcursorFalse;
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if ((*file->read)(file, bytes, 4) != 4)
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return XcursorFalse;
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*u = ((XcursorUInt)(bytes[0]) << 0) | ((XcursorUInt)(bytes[1]) << 8) | ((XcursorUInt)(bytes[2]) << 16) | ((XcursorUInt)(bytes[3]) << 24);
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return XcursorTrue;
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}
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static void
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_XcursorFileHeaderDestroy(XcursorFileHeader *fileHeader)
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{
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free(fileHeader);
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}
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static XcursorFileHeader *
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_XcursorFileHeaderCreate(XcursorUInt ntoc)
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{
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XcursorFileHeader *fileHeader;
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if (ntoc > 0x10000)
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return NULL;
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fileHeader = malloc(sizeof(XcursorFileHeader) + ntoc * sizeof(XcursorFileToc));
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if (!fileHeader)
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return NULL;
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fileHeader->magic = XCURSOR_MAGIC;
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fileHeader->header = XCURSOR_FILE_HEADER_LEN;
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fileHeader->version = XCURSOR_FILE_VERSION;
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fileHeader->ntoc = ntoc;
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fileHeader->tocs = (XcursorFileToc *)(fileHeader + 1);
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return fileHeader;
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}
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static XcursorFileHeader *
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_XcursorReadFileHeader(XcursorFile *file)
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{
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XcursorFileHeader head, *fileHeader;
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XcursorUInt skip;
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unsigned int n;
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if (!file)
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return NULL;
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if (!_XcursorReadUInt(file, &head.magic))
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return NULL;
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if (head.magic != XCURSOR_MAGIC)
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return NULL;
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if (!_XcursorReadUInt(file, &head.header))
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return NULL;
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if (!_XcursorReadUInt(file, &head.version))
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return NULL;
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if (!_XcursorReadUInt(file, &head.ntoc))
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return NULL;
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skip = head.header - XCURSOR_FILE_HEADER_LEN;
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if (skip)
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if (!(*file->skip)(file, skip))
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return NULL;
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fileHeader = _XcursorFileHeaderCreate(head.ntoc);
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if (!fileHeader)
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return NULL;
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fileHeader->magic = head.magic;
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fileHeader->header = head.header;
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fileHeader->version = head.version;
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fileHeader->ntoc = head.ntoc;
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for (n = 0; n < fileHeader->ntoc; n++) {
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if (!_XcursorReadUInt(file, &fileHeader->tocs[n].type))
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break;
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if (!_XcursorReadUInt(file, &fileHeader->tocs[n].subtype))
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break;
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if (!_XcursorReadUInt(file, &fileHeader->tocs[n].position))
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break;
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}
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if (n != fileHeader->ntoc) {
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_XcursorFileHeaderDestroy(fileHeader);
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return NULL;
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}
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return fileHeader;
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}
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static XcursorBool
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_XcursorSeekToToc(XcursorFile *file,
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XcursorFileHeader *fileHeader,
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int toc)
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{
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if (!file || !fileHeader)
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return XcursorFalse;
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return (*file->seek)(file, fileHeader->tocs[toc].position);
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}
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static XcursorBool
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_XcursorFileReadChunkHeader(XcursorFile *file,
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XcursorFileHeader *fileHeader,
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int toc,
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XcursorChunkHeader *chunkHeader)
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{
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if (!file || !fileHeader || !chunkHeader)
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return XcursorFalse;
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if (!_XcursorSeekToToc(file, fileHeader, toc))
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return XcursorFalse;
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if (!_XcursorReadUInt(file, &chunkHeader->header))
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return XcursorFalse;
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if (!_XcursorReadUInt(file, &chunkHeader->type))
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return XcursorFalse;
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if (!_XcursorReadUInt(file, &chunkHeader->subtype))
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return XcursorFalse;
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if (!_XcursorReadUInt(file, &chunkHeader->version))
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return XcursorFalse;
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/* sanity check */
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if (chunkHeader->type != fileHeader->tocs[toc].type || chunkHeader->subtype != fileHeader->tocs[toc].subtype)
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return XcursorFalse;
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return XcursorTrue;
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}
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#define dist(a, b) ((a) > (b) ? (a) - (b) : (b) - (a))
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static XcursorDim
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_XcursorFindBestSize(XcursorFileHeader *fileHeader,
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XcursorDim size,
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int *nsizesp)
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{
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unsigned int n;
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int nsizes = 0;
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XcursorDim bestSize = 0;
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XcursorDim thisSize;
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if (!fileHeader || !nsizesp)
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return 0;
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for (n = 0; n < fileHeader->ntoc; n++) {
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if (fileHeader->tocs[n].type != XCURSOR_IMAGE_TYPE)
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continue;
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thisSize = fileHeader->tocs[n].subtype;
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if (!bestSize || dist(thisSize, size) < dist(bestSize, size)) {
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bestSize = thisSize;
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nsizes = 1;
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} else if (thisSize == bestSize)
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nsizes++;
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}
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*nsizesp = nsizes;
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return bestSize;
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}
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static int
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_XcursorFindImageToc(XcursorFileHeader *fileHeader,
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XcursorDim size,
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int count)
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{
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unsigned int toc;
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XcursorDim thisSize;
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if (!fileHeader)
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return 0;
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for (toc = 0; toc < fileHeader->ntoc; toc++) {
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if (fileHeader->tocs[toc].type != XCURSOR_IMAGE_TYPE)
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continue;
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thisSize = fileHeader->tocs[toc].subtype;
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if (thisSize != size)
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continue;
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if (!count)
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break;
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count--;
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}
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if (toc == fileHeader->ntoc)
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return -1;
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return toc;
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}
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static XcursorImage *
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_XcursorReadImage(XcursorFile *file,
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XcursorFileHeader *fileHeader,
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int toc)
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{
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XcursorChunkHeader chunkHeader;
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XcursorImage head;
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XcursorImage *image;
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int n;
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XcursorPixel *p;
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if (!file || !fileHeader)
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return NULL;
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if (!_XcursorFileReadChunkHeader(file, fileHeader, toc, &chunkHeader))
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return NULL;
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if (!_XcursorReadUInt(file, &head.width))
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return NULL;
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if (!_XcursorReadUInt(file, &head.height))
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return NULL;
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if (!_XcursorReadUInt(file, &head.xhot))
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return NULL;
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if (!_XcursorReadUInt(file, &head.yhot))
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return NULL;
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if (!_XcursorReadUInt(file, &head.delay))
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return NULL;
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/* sanity check data */
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if (head.width > XCURSOR_IMAGE_MAX_SIZE || head.height > XCURSOR_IMAGE_MAX_SIZE)
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return NULL;
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if (head.width == 0 || head.height == 0)
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return NULL;
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if (head.xhot > head.width || head.yhot > head.height)
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return NULL;
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/* Create the image and initialize it */
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image = XcursorImageCreate(head.width, head.height);
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if (image == NULL)
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return NULL;
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if (chunkHeader.version < image->version)
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image->version = chunkHeader.version;
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image->size = chunkHeader.subtype;
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image->xhot = head.xhot;
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image->yhot = head.yhot;
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image->delay = head.delay;
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n = image->width * image->height;
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p = image->pixels;
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while (n--) {
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if (!_XcursorReadUInt(file, p)) {
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XcursorImageDestroy(image);
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return NULL;
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}
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p++;
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}
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return image;
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}
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XcursorImages *
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XcursorXcFileLoadImages(XcursorFile *file, int size)
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{
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XcursorFileHeader *fileHeader;
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XcursorDim bestSize;
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int nsize;
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XcursorImages *images;
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int n;
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int toc;
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if (!file || size < 0)
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return NULL;
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fileHeader = _XcursorReadFileHeader(file);
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if (!fileHeader)
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return NULL;
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bestSize = _XcursorFindBestSize(fileHeader, (XcursorDim)size, &nsize);
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if (!bestSize) {
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_XcursorFileHeaderDestroy(fileHeader);
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return NULL;
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}
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images = XcursorImagesCreate(nsize);
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if (!images) {
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_XcursorFileHeaderDestroy(fileHeader);
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return NULL;
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}
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for (n = 0; n < nsize; n++) {
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toc = _XcursorFindImageToc(fileHeader, bestSize, n);
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if (toc < 0)
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break;
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images->images[images->nimage] = _XcursorReadImage(file, fileHeader,
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toc);
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if (!images->images[images->nimage])
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break;
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images->nimage++;
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}
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_XcursorFileHeaderDestroy(fileHeader);
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if (images->nimage != nsize) {
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XcursorImagesDestroy(images);
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images = NULL;
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}
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return images;
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}
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