diff options
Diffstat (limited to 'libXdmcp/Read.c')
| -rw-r--r-- | libXdmcp/Read.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/libXdmcp/Read.c b/libXdmcp/Read.c new file mode 100644 index 000000000..946a611e9 --- /dev/null +++ b/libXdmcp/Read.c @@ -0,0 +1,244 @@ +/*
+Copyright 1989, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+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 THE
+OPEN GROUP 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 The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+ *
+ * Author: Keith Packard, MIT X Consortium
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <X11/Xos.h>
+#include <X11/X.h>
+#include <X11/Xmd.h>
+#include <X11/Xdmcp.h>
+#include <stdlib.h>
+
+int
+XdmcpReadHeader (XdmcpBufferPtr buffer, XdmcpHeaderPtr header)
+{
+ if (XdmcpReadCARD16 (buffer, &header->version) &&
+ XdmcpReadCARD16 (buffer, &header->opcode) &&
+ XdmcpReadCARD16 (buffer, &header->length))
+ return TRUE;
+ return FALSE;
+}
+
+int
+XdmcpReadRemaining (const XdmcpBufferPtr buffer)
+{
+ return buffer->count - buffer->pointer;
+}
+
+int
+XdmcpReadARRAY8 (XdmcpBufferPtr buffer, ARRAY8Ptr array)
+{
+ int i;
+
+ /*
+ * When returning FALSE, guarantee that array->data = 0.
+ * This allows the user to safely call XdmcpDisposeARRAY8(array)
+ * regardless of the return value below.
+ * Note that XdmcpDisposeARRAY*(array) will call free(array->data),
+ * so we must guarantee that array->data is NULL or a malloced pointer.
+ */
+ if (!XdmcpReadCARD16 (buffer, &array->length)) {
+ array->data = NULL;
+ return FALSE;
+ }
+ if (!array->length)
+ {
+ array->data = NULL;
+ return TRUE;
+ }
+ array->data = (CARD8 *) malloc(array->length * sizeof (CARD8));
+ if (!array->data)
+ return FALSE;
+ for (i = 0; i < (int)array->length; i++)
+ {
+ if (!XdmcpReadCARD8 (buffer, &array->data[i]))
+ {
+ free(array->data);
+ array->data = NULL;
+ array->length = 0;
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
+
+int
+XdmcpReadARRAY16 (XdmcpBufferPtr buffer, ARRAY16Ptr array)
+{
+ int i;
+
+ /*
+ * When returning FALSE, guarantee that array->data = 0.
+ * This allows the user to safely call XdmcpDisposeARRAY16(array)
+ * regardless of the return value below.
+ * Note that XdmcpDisposeARRAY*(array) will call free(array->data),
+ * so we must guarantee that array->data is NULL or a malloced pointer.
+ */
+ if (!XdmcpReadCARD8 (buffer, &array->length)) {
+ array->data = NULL;
+ return FALSE;
+ }
+ if (!array->length)
+ {
+ array->data = NULL;
+ return TRUE;
+ }
+ array->data = (CARD16 *) malloc(array->length * sizeof (CARD16));
+ if (!array->data)
+ return FALSE;
+ for (i = 0; i < (int)array->length; i++)
+ {
+ if (!XdmcpReadCARD16 (buffer, &array->data[i]))
+ {
+ free(array->data);
+ array->data = NULL;
+ array->length = 0;
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
+
+int
+XdmcpReadARRAY32 (XdmcpBufferPtr buffer, ARRAY32Ptr array)
+{
+ int i;
+
+ /*
+ * When returning FALSE, guarantee that array->data = 0.
+ * This allows the user to safely call XdmcpDisposeARRAY32(array)
+ * regardless of the return value below.
+ * Note that XdmcpDisposeARRAY*(array) will call free(array->data),
+ * so we must guarantee that array->data is NULL or a malloced pointer.
+ */
+ if (!XdmcpReadCARD8 (buffer, &array->length)) {
+ array->data = NULL;
+ return FALSE;
+ }
+ if (!array->length)
+ {
+ array->data = NULL;
+ return TRUE;
+ }
+ array->data = (CARD32 *) malloc(array->length * sizeof (CARD32));
+ if (!array->data)
+ return FALSE;
+ for (i = 0; i < (int)array->length; i++)
+ {
+ if (!XdmcpReadCARD32 (buffer, &array->data[i]))
+ {
+ free(array->data);
+ array->data = NULL;
+ array->length = 0;
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
+
+int
+XdmcpReadARRAYofARRAY8 (XdmcpBufferPtr buffer, ARRAYofARRAY8Ptr array)
+{
+ CARD8 i;
+
+ /*
+ * When returning FALSE, guarantee that array->data = 0.
+ * This allows the user to safely call XdmcpDisposeARRAYofARRAY8(array)
+ * regardless of the return value below.
+ * Note that XdmcpDisposeARRAY*(array) will call free(array->data),
+ * so we must guarantee that array->data is NULL or a malloced pointer.
+ */
+ if (!XdmcpReadCARD8 (buffer, &array->length)) {
+ array->data = NULL;
+ return FALSE;
+ }
+ if (!array->length)
+ {
+ array->data = NULL;
+ return TRUE;
+ }
+ array->data = (ARRAY8 *) malloc(array->length * sizeof (ARRAY8));
+ if (!array->data)
+ return FALSE;
+ for (i = 0; i < array->length; i++)
+ {
+ if (!XdmcpReadARRAY8 (buffer, &array->data[i]))
+ {
+ /*
+ * We must free all of the arrays allocated thus far in the loop
+ * and free array->data and finally set array->data = 0;
+ * The easiest way to do this is to reset the length and call
+ * XdmcpDisposeARRAYofARRAY8(array).
+ */
+ array->length = i;
+ XdmcpDisposeARRAYofARRAY8(array);
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
+
+int
+XdmcpReadCARD8 (XdmcpBufferPtr buffer, CARD8Ptr valuep)
+{
+ if (buffer->pointer >= buffer->count)
+ return FALSE;
+ *valuep = (CARD8) buffer->data[buffer->pointer++];
+ return TRUE;
+}
+
+int
+XdmcpReadCARD16 (XdmcpBufferPtr buffer, CARD16Ptr valuep)
+{
+ CARD8 high, low;
+
+ if (XdmcpReadCARD8 (buffer, &high) &&
+ XdmcpReadCARD8 (buffer, &low))
+ {
+ *valuep = (((CARD16) high) << 8) | ((CARD16) low);
+ return TRUE;
+ }
+ return FALSE;
+}
+
+int
+XdmcpReadCARD32 (XdmcpBufferPtr buffer, CARD32Ptr valuep)
+{
+ CARD8 byte0, byte1, byte2, byte3;
+ if (XdmcpReadCARD8 (buffer, &byte0) &&
+ XdmcpReadCARD8 (buffer, &byte1) &&
+ XdmcpReadCARD8 (buffer, &byte2) &&
+ XdmcpReadCARD8 (buffer, &byte3))
+ {
+ *valuep = (((CARD32) byte0) << 24) |
+ (((CARD32) byte1) << 16) |
+ (((CARD32) byte2) << 8) |
+ (((CARD32) byte3));
+ return TRUE;
+ }
+ return FALSE;
+}
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