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xenocara/lib/libXpm/src/parse.c
matthieu 3fa7de0f34 libXpm 3.5.7
2007-09-30 08:38:09 +00:00

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/* $XdotOrg: lib/Xpm/src/parse.c,v 1.6 2005/07/16 21:11:25 alanc Exp $ */
/*
* Copyright (C) 1989-95 GROUPE BULL
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* GROUPE BULL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of GROUPE BULL shall not be
* used in advertising or otherwise to promote the sale, use or other dealings
* in this Software without prior written authorization from GROUPE BULL.
*/
/* $XFree86: xc/extras/Xpm/lib/parse.c,v 1.2 2000/09/26 15:56:43 tsi Exp $ */
/*****************************************************************************\
* parse.c: *
* *
* XPM library *
* Parse an XPM file or array and store the found informations *
* in the given XpmImage structure. *
* *
* Developed by Arnaud Le Hors *
\*****************************************************************************/
/* $XFree86$ */
/*
* The code related to FOR_MSW has been added by
* HeDu (hedu@cul-ipn.uni-kiel.de) 4/94
*/
/* October 2004, source code review by Thomas Biege <thomas@suse.de> */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "XpmI.h"
#include <ctype.h>
#include <string.h>
#if defined(HAS_STRLCAT) || defined(HAVE_STRLCAT)
# define STRLCAT(dst, src, dstsize) do { \
if (strlcat(dst, src, dstsize) >= (dstsize)) \
return (XpmFileInvalid); } while(0)
# define STRLCPY(dst, src, dstsize) do { \
if (strlcpy(dst, src, dstsize) >= (dstsize)) \
return (XpmFileInvalid); } while(0)
#else
# define STRLCAT(dst, src, dstsize) do { \
if ((strlen(dst) + strlen(src)) < (dstsize)) \
strcat(dst, src); \
else return (XpmFileInvalid); } while(0)
# define STRLCPY(dst, src, dstsize) do { \
if (strlen(src) < (dstsize)) \
strcpy(dst, src); \
else return (XpmFileInvalid); } while(0)
#endif
LFUNC(ParsePixels, int, (xpmData *data, unsigned int width,
unsigned int height, unsigned int ncolors,
unsigned int cpp, XpmColor *colorTable,
xpmHashTable *hashtable, unsigned int **pixels));
char *xpmColorKeys[] = {
"s", /* key #1: symbol */
"m", /* key #2: mono visual */
"g4", /* key #3: 4 grays visual */
"g", /* key #4: gray visual */
"c", /* key #5: color visual */
};
int
xpmParseValues(data, width, height, ncolors, cpp,
x_hotspot, y_hotspot, hotspot, extensions)
xpmData *data;
unsigned int *width, *height, *ncolors, *cpp;
unsigned int *x_hotspot, *y_hotspot, *hotspot;
unsigned int *extensions;
{
unsigned int l;
char buf[BUFSIZ + 1];
if (!data->format) { /* XPM 2 or 3 */
/*
* read values: width, height, ncolors, chars_per_pixel
*/
if (!(xpmNextUI(data, width) && xpmNextUI(data, height)
&& xpmNextUI(data, ncolors) && xpmNextUI(data, cpp)))
return (XpmFileInvalid);
/*
* read optional information (hotspot and/or XPMEXT) if any
*/
l = xpmNextWord(data, buf, BUFSIZ);
if (l) {
*extensions = (l == 6 && !strncmp("XPMEXT", buf, 6));
if (*extensions)
*hotspot = (xpmNextUI(data, x_hotspot)
&& xpmNextUI(data, y_hotspot));
else {
*hotspot = (xpmatoui(buf, l, x_hotspot)
&& xpmNextUI(data, y_hotspot));
l = xpmNextWord(data, buf, BUFSIZ);
*extensions = (l == 6 && !strncmp("XPMEXT", buf, 6));
}
}
} else {
/*
* XPM 1 file read values: width, height, ncolors, chars_per_pixel
*/
int i;
char *ptr;
Bool got_one, saw_width = False, saw_height = False;
Bool saw_ncolors = False, saw_chars_per_pixel = False;
for (i = 0; i < 4; i++) {
l = xpmNextWord(data, buf, BUFSIZ);
if (l != 7 || strncmp("#define", buf, 7))
return (XpmFileInvalid);
l = xpmNextWord(data, buf, BUFSIZ);
if (!l)
return (XpmFileInvalid);
buf[l] = '\0';
ptr = buf;
got_one = False;
while (!got_one) {
ptr = strchr(ptr, '_');
if (!ptr)
return (XpmFileInvalid);
switch (l - (ptr - buf)) {
case 6:
if (saw_width || strncmp("_width", ptr, 6)
|| !xpmNextUI(data, width))
return (XpmFileInvalid);
else
saw_width = True;
got_one = True;
break;
case 7:
if (saw_height || strncmp("_height", ptr, 7)
|| !xpmNextUI(data, height))
return (XpmFileInvalid);
else
saw_height = True;
got_one = True;
break;
case 8:
if (saw_ncolors || strncmp("_ncolors", ptr, 8)
|| !xpmNextUI(data, ncolors))
return (XpmFileInvalid);
else
saw_ncolors = True;
got_one = True;
break;
case 16:
if (saw_chars_per_pixel
|| strncmp("_chars_per_pixel", ptr, 16)
|| !xpmNextUI(data, cpp))
return (XpmFileInvalid);
else
saw_chars_per_pixel = True;
got_one = True;
break;
default:
ptr++;
}
}
/* skip the end of line */
xpmNextString(data);
}
if (!saw_width || !saw_height || !saw_ncolors || !saw_chars_per_pixel)
return (XpmFileInvalid);
*hotspot = 0;
*extensions = 0;
}
return (XpmSuccess);
}
int
xpmParseColors(data, ncolors, cpp, colorTablePtr, hashtable)
xpmData *data;
unsigned int ncolors;
unsigned int cpp;
XpmColor **colorTablePtr;
xpmHashTable *hashtable;
{
unsigned int key = 0, l, a, b, len;
unsigned int curkey; /* current color key */
unsigned int lastwaskey; /* key read */
char buf[BUFSIZ+1];
char curbuf[BUFSIZ]; /* current buffer */
char **sptr, *s;
XpmColor *color;
XpmColor *colorTable;
char **defaults;
int ErrorStatus;
if (ncolors >= UINT_MAX / sizeof(XpmColor))
return (XpmNoMemory);
colorTable = (XpmColor *) XpmCalloc(ncolors, sizeof(XpmColor));
if (!colorTable)
return (XpmNoMemory);
if (!data->format) { /* XPM 2 or 3 */
for (a = 0, color = colorTable; a < ncolors; a++, color++) {
xpmNextString(data); /* skip the line */
/*
* read pixel value
*/
if (cpp >= UINT_MAX - 1) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
color->string = (char *) XpmMalloc(cpp + 1);
if (!color->string) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
for (b = 0, s = color->string; b < cpp; b++, s++)
*s = xpmGetC(data);
*s = '\0';
/*
* store the string in the hashtable with its color index number
*/
if (USE_HASHTABLE) {
ErrorStatus =
xpmHashIntern(hashtable, color->string, HashAtomData(a));
if (ErrorStatus != XpmSuccess) {
xpmFreeColorTable(colorTable, ncolors);
return (ErrorStatus);
}
}
/*
* read color keys and values
*/
defaults = (char **) color;
curkey = 0;
lastwaskey = 0;
*curbuf = '\0'; /* init curbuf */
while ((l = xpmNextWord(data, buf, BUFSIZ))) {
if (!lastwaskey) {
for (key = 0, sptr = xpmColorKeys; key < NKEYS; key++,
sptr++)
if ((strlen(*sptr) == l) && (!strncmp(*sptr, buf, l)))
break;
}
if (!lastwaskey && key < NKEYS) { /* open new key */
if (curkey) { /* flush string */
len = strlen(curbuf) + 1;
s = (char *) XpmMalloc(len);
if (!s) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
defaults[curkey] = s;
memcpy(s, curbuf, len);
}
curkey = key + 1; /* set new key */
*curbuf = '\0'; /* reset curbuf */
lastwaskey = 1;
} else {
if (!curkey) { /* key without value */
xpmFreeColorTable(colorTable, ncolors);
return (XpmFileInvalid);
}
if (!lastwaskey)
STRLCAT(curbuf, " ", sizeof(curbuf));/* append space */
buf[l] = '\0';
STRLCAT(curbuf, buf, sizeof(curbuf)); /* append buf */
lastwaskey = 0;
}
}
if (!curkey) { /* key without value */
xpmFreeColorTable(colorTable, ncolors);
return (XpmFileInvalid);
}
len = strlen(curbuf) + 1; /* integer overflow just theoretically possible */
s = defaults[curkey] = (char *) XpmMalloc(len);
if (!s) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
memcpy(s, curbuf, len);
}
} else { /* XPM 1 */
/* get to the beginning of the first string */
data->Bos = '"';
data->Eos = '\0';
xpmNextString(data);
data->Eos = '"';
for (a = 0, color = colorTable; a < ncolors; a++, color++) {
/*
* read pixel value
*/
if (cpp >= UINT_MAX - 1) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
color->string = (char *) XpmMalloc(cpp + 1);
if (!color->string) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
for (b = 0, s = color->string; b < cpp; b++, s++)
*s = xpmGetC(data);
*s = '\0';
/*
* store the string in the hashtable with its color index number
*/
if (USE_HASHTABLE) {
ErrorStatus =
xpmHashIntern(hashtable, color->string, HashAtomData(a));
if (ErrorStatus != XpmSuccess) {
xpmFreeColorTable(colorTable, ncolors);
return (ErrorStatus);
}
}
/*
* read color values
*/
xpmNextString(data); /* get to the next string */
*curbuf = '\0'; /* init curbuf */
while ((l = xpmNextWord(data, buf, BUFSIZ))) {
if (*curbuf != '\0')
STRLCAT(curbuf, " ", sizeof(curbuf));/* append space */
buf[l] = '\0';
STRLCAT(curbuf, buf, sizeof(curbuf)); /* append buf */
}
len = strlen(curbuf) + 1;
s = (char *) XpmMalloc(len);
if (!s) {
xpmFreeColorTable(colorTable, ncolors);
return (XpmNoMemory);
}
memcpy(s, curbuf, len);
color->c_color = s;
*curbuf = '\0'; /* reset curbuf */
if (a < ncolors - 1) /* can we trust ncolors -> leave data's bounds */
xpmNextString(data); /* get to the next string */
}
}
*colorTablePtr = colorTable;
return (XpmSuccess);
}
static int
ParsePixels(data, width, height, ncolors, cpp, colorTable, hashtable, pixels)
xpmData *data;
unsigned int width;
unsigned int height;
unsigned int ncolors;
unsigned int cpp;
XpmColor *colorTable;
xpmHashTable *hashtable;
unsigned int **pixels;
{
unsigned int *iptr, *iptr2 = NULL; /* found by Egbert Eich */
unsigned int a, x, y;
if ((height > 0 && width >= UINT_MAX / height) ||
width * height >= UINT_MAX / sizeof(unsigned int))
return XpmNoMemory;
#ifndef FOR_MSW
iptr2 = (unsigned int *) XpmMalloc(sizeof(unsigned int) * width * height);
#else
/*
* special treatment to trick DOS malloc(size_t) where size_t is 16 bit!!
* XpmMalloc is defined to longMalloc(long) and checks the 16 bit boundary
*/
iptr2 = (unsigned int *)
XpmMalloc((long) sizeof(unsigned int) * (long) width * (long) height);
#endif
if (!iptr2)
return (XpmNoMemory);
iptr = iptr2;
switch (cpp) {
case (1): /* Optimize for single character
* colors */
{
unsigned short colidx[256];
if (ncolors > 256) {
XpmFree(iptr2); /* found by Egbert Eich */
return (XpmFileInvalid);
}
bzero((char *)colidx, 256 * sizeof(short));
for (a = 0; a < ncolors; a++)
colidx[(unsigned char)colorTable[a].string[0]] = a + 1;
for (y = 0; y < height; y++) {
xpmNextString(data);
for (x = 0; x < width; x++, iptr++) {
int c = xpmGetC(data);
if (c > 0 && c < 256 && colidx[c] != 0)
*iptr = colidx[c] - 1;
else {
XpmFree(iptr2);
return (XpmFileInvalid);
}
}
}
}
break;
case (2): /* Optimize for double character
* colors */
{
/* free all allocated pointers at all exits */
#define FREE_CIDX \
do \
{ \
int f; for (f = 0; f < 256; f++) \
if (cidx[f]) XpmFree(cidx[f]); \
} while(0)
/* array of pointers malloced by need */
unsigned short *cidx[256];
unsigned int char1;
bzero((char *)cidx, 256 * sizeof(unsigned short *)); /* init */
for (a = 0; a < ncolors; a++) {
char1 = (unsigned char) colorTable[a].string[0];
if (cidx[char1] == NULL) { /* get new memory */
cidx[char1] = (unsigned short *)
XpmCalloc(256, sizeof(unsigned short));
if (cidx[char1] == NULL) { /* new block failed */
FREE_CIDX;
XpmFree(iptr2);
return (XpmNoMemory);
}
}
cidx[char1][(unsigned char)colorTable[a].string[1]] = a + 1;
}
for (y = 0; y < height; y++) {
xpmNextString(data);
for (x = 0; x < width; x++, iptr++) {
int cc1 = xpmGetC(data);
if (cc1 > 0 && cc1 < 256) {
int cc2 = xpmGetC(data);
if (cc2 > 0 && cc2 < 256 &&
cidx[cc1] && cidx[cc1][cc2] != 0)
*iptr = cidx[cc1][cc2] - 1;
else {
FREE_CIDX;
XpmFree(iptr2);
return (XpmFileInvalid);
}
} else {
FREE_CIDX;
XpmFree(iptr2);
return (XpmFileInvalid);
}
}
}
FREE_CIDX;
}
break;
default: /* Non-optimized case of long color
* names */
{
char *s;
char buf[BUFSIZ];
if (cpp >= sizeof(buf)) {
XpmFree(iptr2); /* found by Egbert Eich */
return (XpmFileInvalid);
}
buf[cpp] = '\0';
if (USE_HASHTABLE) {
xpmHashAtom *slot;
for (y = 0; y < height; y++) {
xpmNextString(data);
for (x = 0; x < width; x++, iptr++) {
for (a = 0, s = buf; a < cpp; a++, s++)
*s = xpmGetC(data); /* int assigned to char, not a problem here */
slot = xpmHashSlot(hashtable, buf);
if (!*slot) { /* no color matches */
XpmFree(iptr2);
return (XpmFileInvalid);
}
*iptr = HashColorIndex(slot);
}
}
} else {
for (y = 0; y < height; y++) {
xpmNextString(data);
for (x = 0; x < width; x++, iptr++) {
for (a = 0, s = buf; a < cpp; a++, s++)
*s = xpmGetC(data); /* int assigned to char, not a problem here */
for (a = 0; a < ncolors; a++)
if (!strcmp(colorTable[a].string, buf))
break;
if (a == ncolors) { /* no color matches */
XpmFree(iptr2);
return (XpmFileInvalid);
}
*iptr = a;
}
}
}
}
break;
}
*pixels = iptr2;
return (XpmSuccess);
}
int
xpmParseExtensions(data, extensions, nextensions)
xpmData *data;
XpmExtension **extensions;
unsigned int *nextensions;
{
XpmExtension *exts = NULL, *ext;
unsigned int num = 0;
unsigned int nlines, a, l, notstart, notend = 0;
int status;
char *string, *s, *s2, **sp;
xpmNextString(data);
exts = (XpmExtension *) XpmMalloc(sizeof(XpmExtension));
/* get the whole string */
status = xpmGetString(data, &string, &l);
if (status != XpmSuccess) {
XpmFree(exts);
return (status);
}
/* look for the key word XPMEXT, skip lines before this */
while ((notstart = strncmp("XPMEXT", string, 6))
&& (notend = strncmp("XPMENDEXT", string, 9))) {
XpmFree(string);
xpmNextString(data);
status = xpmGetString(data, &string, &l);
if (status != XpmSuccess) {
XpmFree(exts);
return (status);
}
}
if (!notstart)
notend = strncmp("XPMENDEXT", string, 9);
while (!notstart && notend) {
/* there starts an extension */
ext = (XpmExtension *)
XpmRealloc(exts, (num + 1) * sizeof(XpmExtension)); /* can the loop be forced to iterate often enough to make "(num + 1) * sizeof(XpmExtension)" wrapping? */
if (!ext) {
XpmFree(string);
XpmFreeExtensions(exts, num);
return (XpmNoMemory);
}
exts = ext;
ext += num;
/* skip whitespace and store its name */
s2 = s = string + 6;
while (isspace(*s2))
s2++;
a = s2 - s;
ext->name = (char *) XpmMalloc(l - a - 6);
if (!ext->name) {
XpmFree(string);
ext->lines = NULL;
ext->nlines = 0;
XpmFreeExtensions(exts, num + 1);
return (XpmNoMemory);
}
strncpy(ext->name, s + a, l - a - 6);
XpmFree(string);
/* now store the related lines */
xpmNextString(data);
status = xpmGetString(data, &string, &l);
if (status != XpmSuccess) {
ext->lines = NULL;
ext->nlines = 0;
XpmFreeExtensions(exts, num + 1);
return (status);
}
ext->lines = (char **) XpmMalloc(sizeof(char *));
nlines = 0;
while ((notstart = strncmp("XPMEXT", string, 6))
&& (notend = strncmp("XPMENDEXT", string, 9))) {
sp = (char **)
XpmRealloc(ext->lines, (nlines + 1) * sizeof(char *)); /* can we iterate enough for a wrapping? */
if (!sp) {
XpmFree(string);
ext->nlines = nlines;
XpmFreeExtensions(exts, num + 1);
return (XpmNoMemory);
}
ext->lines = sp;
ext->lines[nlines] = string;
nlines++;
xpmNextString(data);
status = xpmGetString(data, &string, &l);
if (status != XpmSuccess) {
ext->nlines = nlines;
XpmFreeExtensions(exts, num + 1);
return (status);
}
}
if (!nlines) {
XpmFree(ext->lines);
ext->lines = NULL;
}
ext->nlines = nlines;
num++;
}
if (!num) {
XpmFree(string);
XpmFree(exts);
exts = NULL;
} else if (!notend)
XpmFree(string);
*nextensions = num;
*extensions = exts;
return (XpmSuccess);
}
/* function call in case of error */
#undef RETURN
#define RETURN(status) \
do { \
goto error; \
} while(0)
/*
* This function parses an Xpm file or data and store the found informations
* in an an XpmImage structure which is returned.
*/
int
xpmParseData(data, image, info)
xpmData *data;
XpmImage *image;
XpmInfo *info;
{
/* variables to return */
unsigned int width, height, ncolors, cpp;
unsigned int x_hotspot, y_hotspot, hotspot = 0, extensions = 0;
XpmColor *colorTable = NULL;
unsigned int *pixelindex = NULL;
char *hints_cmt = NULL;
char *colors_cmt = NULL;
char *pixels_cmt = NULL;
unsigned int cmts;
int ErrorStatus;
xpmHashTable hashtable;
cmts = info && (info->valuemask & XpmReturnComments);
/*
* parse the header
*/
ErrorStatus = xpmParseHeader(data);
if (ErrorStatus != XpmSuccess)
return (ErrorStatus);
/*
* read values
*/
ErrorStatus = xpmParseValues(data, &width, &height, &ncolors, &cpp,
&x_hotspot, &y_hotspot, &hotspot,
&extensions);
if (ErrorStatus != XpmSuccess)
return (ErrorStatus);
/*
* store the hints comment line
*/
if (cmts)
xpmGetCmt(data, &hints_cmt);
/*
* init the hashtable
*/
if (USE_HASHTABLE) {
ErrorStatus = xpmHashTableInit(&hashtable);
if (ErrorStatus != XpmSuccess)
RETURN(ErrorStatus);
}
/*
* read colors
*/
ErrorStatus = xpmParseColors(data, ncolors, cpp, &colorTable, &hashtable);
if (ErrorStatus != XpmSuccess) {
if (USE_HASHTABLE)
xpmHashTableFree(&hashtable);
RETURN(ErrorStatus);
}
/*
* store the colors comment line
*/
if (cmts)
xpmGetCmt(data, &colors_cmt);
/*
* read pixels and index them on color number
*/
ErrorStatus = ParsePixels(data, width, height, ncolors, cpp, colorTable,
&hashtable, &pixelindex);
/*
* free the hastable
*/
if (USE_HASHTABLE)
xpmHashTableFree(&hashtable);
if (ErrorStatus != XpmSuccess)
RETURN(ErrorStatus);
/*
* store the pixels comment line
*/
if (cmts)
xpmGetCmt(data, &pixels_cmt);
/*
* parse extensions
*/
if (info && (info->valuemask & XpmReturnExtensions)) {
if (extensions) {
ErrorStatus = xpmParseExtensions(data, &info->extensions,
&info->nextensions);
if (ErrorStatus != XpmSuccess)
RETURN(ErrorStatus);
} else {
info->extensions = NULL;
info->nextensions = 0;
}
}
/*
* store found informations in the XpmImage structure
*/
image->width = width;
image->height = height;
image->cpp = cpp;
image->ncolors = ncolors;
image->colorTable = colorTable;
image->data = pixelindex;
if (info) {
if (cmts) {
info->hints_cmt = hints_cmt;
info->colors_cmt = colors_cmt;
info->pixels_cmt = pixels_cmt;
}
if (hotspot) {
info->x_hotspot = x_hotspot;
info->y_hotspot = y_hotspot;
info->valuemask |= XpmHotspot;
}
}
return (XpmSuccess);
/* exit point in case of error, free only locally allocated variables */
error:
if (colorTable)
xpmFreeColorTable(colorTable, ncolors);
if (pixelindex)
XpmFree(pixelindex);
if (hints_cmt)
XpmFree(hints_cmt);
if (colors_cmt)
XpmFree(colors_cmt);
if (pixels_cmt)
XpmFree(pixels_cmt);
return(ErrorStatus);
}
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