Remove xcl and CVSROOT.

18 files changed, 1620 insertions, 0 deletions

diff --git a/COPYING.LIB b/COPYING.LIB
new file mode 100644
index 0000000..b124cf5
--- /dev/null
+++ b/COPYING.LIB
@@ -0,0 +1,510 @@
+
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diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..743c0bd
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,7 @@
+lib_LTLIBRARIES = libXamine.la
+
+libXamine_la_SOURCES = src/xamine.c src/strsplit.c
+include_HEADERS = src/xamine.h
+
+libXamine_la_CFLAGS = $(LIBXML_CFLAGS)
+libXamine_la_LIBADD = $(LIBXML_LIBS)
diff --git a/README b/README
new file mode 100644
index 0000000..95706d1
--- /dev/null
+++ b/README
@@ -0,0 +1,21 @@
+Xamine is a protocol analysis library for the X Window System protocol, based
+on XML-XCB protocol descriptions.  Given a binary X protocol stream, Xamine
+can reconstruct the structured tree of requests, replies, events, and errors.
+
+Xamine is under heavy development; the functionality and interface are subject
+to change.
+
+Currently, Xamine only handles X events.  All the code to parse an arbitrary
+description is available (though the appropriate hooks are needed to handle
+some additional top-level XML tags such as request and error and pass the
+contents to the structure-field-handling functions); the main task required to
+handle requests and replies is the code which follows those requests and
+replies in the stream, finds the appropriate XamineDescription based on the
+major/minor number and a reply hash (much like XCB's mechanism), and uses that
+for parsing.
+
+The biggest limitation right now is that the caller must determine the size of
+the data to pass to Xamine's parsing functions; this should definitely be
+fixed, and users of the Xamine library should be able to pass arbitrary
+amounts of data to Xamine until enough is available to provide parsed
+structures.
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..c344e92
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,14 @@
+AC_INIT([libXamine], 0.1, [josh@freedesktop.org])
+AC_CONFIG_SRCDIR([libXamine.pc.in])
+AM_INIT_AUTOMAKE([foreign dist-bzip2 subdir-objects])
+
+AC_PROG_LIBTOOL
+AC_PROG_CC
+AM_PROG_CC_C_O
+AC_HEADER_STDC
+
+PKG_CHECK_MODULES(LIBXML, libxml-2.0)
+AC_SUBST(LIBXML_CFLAGS)
+AC_SUBST(LIBXML_LIBS)
+
+AC_OUTPUT([Makefile libXamine.pc])
diff --git a/debian/changelog b/debian/changelog
new file mode 100644
index 0000000..3410731
--- /dev/null
+++ b/debian/changelog
@@ -0,0 +1,5 @@
+xamine (0.1-1) unstable; urgency=low
+
+  * Initial Release.
+
+ -- Josh Triplett <josh@freedesktop.org>  Fri,  4 Mar 2005 22:10:19 -0800
diff --git a/debian/compat b/debian/compat
new file mode 100644
index 0000000..b8626c4
--- /dev/null
+++ b/debian/compat
@@ -0,0 +1 @@
+4
diff --git a/debian/control b/debian/control
new file mode 100644
index 0000000..0aa4834
--- /dev/null
+++ b/debian/control
@@ -0,0 +1,36 @@
+Source: xamine
+Priority: optional
+Maintainer: Josh Triplett <josh@freedesktop.org>
+Build-Depends: cdbs, debhelper (>= 4.0.0), libxml2-dev
+Standards-Version: 3.6.1
+
+Package: libxamine-dev
+Section: libdevel
+Architecture: any
+Depends: libxamine0 (= ${Source-Version})
+Description: X Window System protocol analysis library, development files
+ Xamine is a protocol analysis library for the X Window System protocol, based
+ on XML-XCB protocol descriptions.  Given a binary X protocol stream, Xamine
+ can reconstruct the structured tree of requests, replies, events, and errors.
+ .
+ Xamine is under heavy development; the functionality and interface are
+ subject to change.
+ .
+ This package contains the header and library files needed to build software
+ using libXamine.
+
+Package: libxamine0
+Section: libs
+Architecture: any
+Depends: ${shlibs:Depends}, ${misc:Depends}
+Recommends: fd.o-xcb-proto
+Description: X Window System protocol analysis library
+ Xamine is a protocol analysis library for the X Window System protocol, based
+ on XML-XCB protocol descriptions.  Given a binary X protocol stream, Xamine
+ can reconstruct the structured tree of requests, replies, events, and errors.
+ .
+ Xamine is under heavy development; the functionality and interface are
+ subject to change.
+ .
+ This package contains the library files needed to run software using
+ libXamine.
diff --git a/debian/copyright b/debian/copyright
new file mode 100644
index 0000000..551916e
--- /dev/null
+++ b/debian/copyright
@@ -0,0 +1,26 @@
+This package was debianized by Josh Triplett <josh@freedesktop.org> on
+Fri,  4 Mar 2005 22:10:19 -0800.
+
+It was downloaded from FIXME.
+
+Upstream Author: Josh Triplett <josh@freedesktop.org>
+
+License:
+
+/* Xamine - X Protocol Analyzer
+ * Copyright (C) 2004-2005 Josh Triplett
+ * 
+ * This package is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ * 
+ * This package is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ */
+
+On Debian systems, the complete text of the GNU Lesser General Public License
+can be found in `/usr/share/common-licenses/LGPL'.
+
diff --git a/debian/libxamine-dev.dirs b/debian/libxamine-dev.dirs
new file mode 100644
index 0000000..4418816
--- /dev/null
+++ b/debian/libxamine-dev.dirs
@@ -0,0 +1,2 @@
+usr/lib
+usr/include
diff --git a/debian/libxamine-dev.install b/debian/libxamine-dev.install
new file mode 100644
index 0000000..68a175d
--- /dev/null
+++ b/debian/libxamine-dev.install
@@ -0,0 +1,5 @@
+usr/include/*
+usr/lib/lib*.a
+usr/lib/lib*.so
+usr/lib/pkgconfig/*
+usr/lib/*.la
diff --git a/debian/libxamine0.dirs b/debian/libxamine0.dirs
new file mode 100644
index 0000000..6845771
--- /dev/null
+++ b/debian/libxamine0.dirs
@@ -0,0 +1 @@
+usr/lib
diff --git a/debian/libxamine0.install b/debian/libxamine0.install
new file mode 100644
index 0000000..d0dbfd1
--- /dev/null
+++ b/debian/libxamine0.install
@@ -0,0 +1 @@
+usr/lib/lib*.so.*
diff --git a/debian/rules b/debian/rules
new file mode 100755
index 0000000..f1e8443
--- /dev/null
+++ b/debian/rules
@@ -0,0 +1,4 @@
+#!/usr/bin/make -f
+DEB_DH_INSTALL_SOURCEDIR=debian/tmp
+include /usr/share/cdbs/1/rules/debhelper.mk
+include /usr/share/cdbs/1/class/autotools.mk
diff --git a/libXamine.pc.in b/libXamine.pc.in
new file mode 100644
index 0000000..02b97b4
--- /dev/null
+++ b/libXamine.pc.in
@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libXamine
+Description: Library to dissect binary X Window System protocol streams
+Version: @PACKAGE_VERSION@
+Libs: -L${libdir} @LIBS@
+Cflags: -I${includedir}
diff --git a/src/strsplit.c b/src/strsplit.c
new file mode 100644
index 0000000..c5ea36c
--- /dev/null
+++ b/src/strsplit.c
@@ -0,0 +1,96 @@
+/* strsplit.c - Split a string into an array of tokens
+ * Copyright (C) 2004-2005 Josh Triplett
+ * 
+ * This package is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ * 
+ * This package is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+
+/* strsplit splits the string input into tokens based on the delimiters in
+ * delim.  It returns an array of char*s containing the tokens, ending with a
+ * NULL char*.  If malloc fails, or either input string is NULL, strsplit
+ * returns NULL.  */
+char ** strsplit(const char *input, const char *delim)
+{
+    /* Rather than allocating a string for each token, strsplit duplicates the
+     * input string, replaces the delimiters with '\0', and creates an array
+     * of pointers into this string. */
+    
+    char *str;                   /* Copy of the input string */
+    int len;                     /* Length of the input string */
+    int token_count;             /* Number of tokens in the input string */
+    int token;                   /* Current token */
+    enum { TOKEN, DELIM } state; /* Type of the previous character */
+    char **tokens;               /* Array of tokens */
+    int i;                       /* Loop index */
+    
+    if(input == NULL || delim == NULL)
+        return NULL;
+
+    len = strlen(input);
+    
+    /* Duplicate the input string. */
+    str = malloc(len + 1);
+    if(str == NULL)
+        return NULL;
+    strcpy(str, input);
+    
+    /* Count the number of tokens, and replace the delimiters with '\0'. */
+    token_count = 0;
+    state = DELIM;
+    for(i = 0; i < len; i++)
+    {
+        if(strchr(delim, str[i]) != NULL)
+        {
+            str[i] = '\0';
+            state = DELIM;
+        }
+        else if(state == DELIM)
+        {
+            state = TOKEN;
+            token_count++;
+        }
+    }
+
+    /* Allocate the array of tokens. */
+    tokens = malloc((token_count+1)*sizeof(char*));
+    if(tokens == NULL)
+    {
+        free(str);
+        return NULL;
+    }
+
+    /* Set each element in tokens to point to the beginning of the
+     * corresponding token in str. */
+    token = 0;
+    state = DELIM;
+    for(i = 0; i < len; i++)
+    {
+        if(str[i] == '\0')
+            state = DELIM;
+        else if(state == DELIM)
+        {
+            state = TOKEN;
+            tokens[token++] = &(str[i]);
+        }
+    }
+    tokens[token_count] = NULL;
+    
+    return tokens;
+}
+
+/* strsplit_free frees the array returned by strsplit. */
+void strsplit_free(char **tokens)
+{
+    free(*tokens);
+    free(tokens);
+}
diff --git a/src/strsplit.h b/src/strsplit.h
new file mode 100644
index 0000000..673778f
--- /dev/null
+++ b/src/strsplit.h
@@ -0,0 +1,27 @@
+/* strsplit.c - Split a string into an array of tokens
+ * Copyright (C) 2004-2005 Josh Triplett
+ * 
+ * This package is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ * 
+ * This package is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ */
+
+#if !defined(STRSPLIT_H)
+#define STRSPLIT_H
+
+/* strsplit splits the string str into tokens based on the delimiters in
+ * delim.  It returns an array of char*s containing the tokens, ending with a
+ * NULL char*.  If malloc fails, or either input string is NULL, strsplit
+ * returns NULL.  */
+char ** strsplit(const char *str, const char *delim);
+
+/* strsplit_free frees the array returned by strsplit. */
+void strsplit_free(char **tokens);
+
+#endif /* !defined(STRSPLIT_H) */
diff --git a/src/xamine.c b/src/xamine.c
new file mode 100644
index 0000000..806fade
--- /dev/null
+++ b/src/xamine.c
@@ -0,0 +1,728 @@
+/* Xamine - X Protocol Analyzer
+ * Copyright (C) 2004-2005 Josh Triplett
+ * 
+ * This package is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ * 
+ * This package is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ */
+#include <glob.h>
+#include <libxml/parser.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include "strsplit.h"
+#include "xamine.h"
+
+const char *XAMINE_PATH_DEFAULT = "/usr/include/X11/XCB:"
+                                  "/usr/include/X11/XCB/extensions";
+const char *XAMINE_PATH_DELIM = ":";
+const char *XAMINE_PATH_GLOB = "/*.xml";
+
+/* Concrete definitions for opaque and private structure types. */
+typedef struct XamineEvent
+{
+    unsigned char number;
+    XamineDefinition *definition;
+    struct XamineEvent *next;
+} XamineEvent;
+
+typedef struct XamineError
+{
+    unsigned char number;
+    XamineDefinition *definition;
+    struct XamineError *next;
+} XamineError;
+
+typedef struct XamineExtension
+{
+    char *name;
+    char *xname;
+    XamineEvent *events;
+    XamineError *errors;
+    struct XamineExtension *next;
+} XamineExtension;
+
+struct XamineState
+{
+    unsigned char host_is_le;
+    XamineDefinition *definitions;
+    XamineDefinition *core_events[64];  /* Core events 2-63 (0-1 unused) */
+    XamineDefinition *core_errors[128]; /* Core errors 0-127             */
+    XamineExtension  *extensions;
+};
+
+struct XamineConversation
+{
+    XamineState *state;
+    unsigned char is_le;
+    XamineDefinition *extension_events[64];  /* Extension events 64-127  */
+    XamineDefinition *extension_errors[128]; /* Extension errors 128-255 */
+    XamineExtension *extensions[128];        /* Extensions 128-255       */
+};
+
+static const XamineDefinition core_type_definitions[] =
+{
+    { "char",   XAMINE_CHAR,     1 },
+    { "BOOL",   XAMINE_BOOLEAN,  1 },
+    { "BYTE",   XAMINE_UNSIGNED, 1 },
+    { "CARD8",  XAMINE_UNSIGNED, 1 },
+    { "CARD16", XAMINE_UNSIGNED, 2 },
+    { "CARD32", XAMINE_UNSIGNED, 4 },
+    { "INT8",   XAMINE_SIGNED,   1 },
+    { "INT16",  XAMINE_SIGNED,   2 },
+    { "INT32",  XAMINE_SIGNED,   4 }
+};
+
+static void xamine_parse_xmlxcb_file(XamineState *state, char *filename);
+static char* xamine_make_name(XamineExtension *extension, char *name);
+static XamineDefinition *xamine_find_type(XamineState *state, char *name);
+static xmlNode *xamine_xml_next_elem(xmlNode *elem);
+static XamineFieldDefinition *xamine_parse_fields(XamineState *state,
+                                                  xmlNode *elem);
+static XamineExpression *xamine_parse_expression(XamineState *state,
+                                                 xmlNode *elem);
+static XaminedItem *xamine_definition(XamineConversation *conversation,
+                                      void **data, unsigned int *size,
+                                      unsigned int *offset,
+                                      XamineDefinition *definition,
+                                      XaminedItem *parent);
+static XaminedItem *xamine_field_definition(XamineConversation *conversation,
+                                            void **data, unsigned int *size,
+                                            unsigned int *offset,
+                                            XamineFieldDefinition *definition,
+                                            XaminedItem *parent);
+
+/* Initialization and cleanup */
+XamineState *xamine_init()
+{
+    int i;
+    const char *xamine_path_env;
+    char **xamine_path;
+    char **iter;
+    glob_t xml_files;
+    XamineState *state = calloc(1, sizeof(XamineState));
+
+    if(!state)
+        return NULL;
+
+    {
+        unsigned long l = 1;
+        state->host_is_le = *(unsigned char*)&l;
+    }
+
+    /* Add definitions of core types. */
+    for(i = 0; i < sizeof(core_type_definitions)/sizeof(XamineDefinition); i++)
+    {
+        XamineDefinition *temp = calloc(1, sizeof(XamineDefinition));
+        if(!temp)
+        {
+            xamine_cleanup(state);
+            return NULL;
+        }
+
+        *temp = core_type_definitions[i];
+        
+        temp->next = state->definitions;
+        state->definitions = temp;
+        
+        temp->name = strdup(core_type_definitions[i].name);
+        if(!temp->name)
+        {
+            xamine_cleanup(state);
+            return NULL;
+        }
+    }
+
+    /* Set up the search path for XML-XCB descriptions. */
+    xamine_path_env = getenv("XAMINE_PATH");
+    if(!xamine_path_env)
+        xamine_path_env = XAMINE_PATH_DEFAULT;
+    xamine_path = strsplit(xamine_path_env, XAMINE_PATH_DELIM);
+    if(!xamine_path)
+    {
+        xamine_cleanup(state);
+        return NULL;
+    }
+
+    /* Find all the XML files on the search path. */
+    xml_files.gl_pathv = NULL;
+    for(iter = xamine_path; *iter; iter++)
+    {
+        char *pattern = malloc(1+strlen(*iter)+strlen(XAMINE_PATH_GLOB));
+        if(!pattern)
+        {
+            if(xml_files.gl_pathv)
+                globfree(&xml_files);
+            strsplit_free(xamine_path);
+            xamine_cleanup(state);
+            return NULL;
+        }
+
+        strcpy(pattern, *iter);
+        strcat(pattern, XAMINE_PATH_GLOB);
+        
+        glob(pattern, (xml_files.gl_pathv ? GLOB_APPEND : 0), NULL,
+             &xml_files);
+    }
+
+    strsplit_free(xamine_path);
+
+    /* Parse the XML files. */
+    if(xml_files.gl_pathv)
+    {
+        for(iter = xml_files.gl_pathv; *iter; iter++)
+            xamine_parse_xmlxcb_file(state, *iter);
+    }
+
+    globfree(&xml_files);
+
+    return state;
+}
+
+void xamine_cleanup(XamineState *state)
+{
+    XamineDefinition *temp;
+    while(state->definitions)
+    {
+        temp = state->definitions;
+        state->definitions = state->definitions->next;
+        free(temp);
+    }
+    /* FIXME: incomplete */
+}
+
+/* Retrieval of the type definitions. */
+XamineDefinition *xamine_get_definitions(XamineState *state)
+{
+    if(state == NULL)
+        return NULL;
+
+    return state->definitions;
+}
+
+/* Creation and destruction of conversations. */
+XamineConversation *xamine_create_conversation(XamineState *state)
+{
+    XamineConversation *conversation = calloc(1, sizeof(XamineConversation));
+    if(conversation == NULL)
+        return NULL;
+    conversation->state = state;
+    /* FIXME */
+    conversation->is_le = state->host_is_le;
+    return conversation;
+}
+
+void xamine_free_conversation(XamineConversation *conversation)
+{
+    free(conversation);
+}
+
+/* Analysis */
+XaminedItem *xamine(XamineConversation *conversation, XamineDirection dir,
+                     void *data, unsigned int size)
+{
+    XamineDefinition *definition = NULL;
+    
+    if(dir == XAMINE_REQUEST)
+    {
+        /* Request layout:
+         * 1-byte major opcode
+         * 1 byte of request-specific data
+         * 2-byte length (0 if big request)
+         * If 2-byte length is zero, 4-byte length.
+         * Rest of request-specific data
+         */
+        return NULL; /* Not yet implemented. */
+    }
+    else if(dir == XAMINE_RESPONSE)
+    {
+        unsigned char response_type;
+        
+        if(size < 32)
+            return NULL;
+
+        response_type = *(unsigned char *)data;
+        if(response_type == 0)      /* Error */
+        {
+            unsigned char error_code = *(unsigned char*)(data+1);
+            if(error_code < 128)
+                definition = conversation->state->core_errors[error_code];
+            else
+                definition = conversation->extension_errors[error_code-128];
+        }
+        else if(response_type == 1) /* Reply */
+            return NULL;            /* Not yet implemented. */
+        else                        /* Event */
+        {
+            /* Turn off SendEvent flag before looking up by event number. */
+            unsigned char event_code = response_type & ~0x80;
+            if(event_code < 64)
+                definition = conversation->state->core_events[event_code];
+            else
+                definition = conversation->extension_events[event_code-64];
+        }
+    }
+
+    if(definition == NULL)
+        return NULL;
+
+    /* Dissect the data based on the definition. */
+    int offset = 0;
+    return xamine_definition(conversation, &data, &size, &offset,
+                             definition, NULL);
+}
+
+void xamine_free(XaminedItem *item)
+{
+    if(item)
+    {
+        xamine_free(item->child);
+        xamine_free(item->next);
+        free(item);
+    }
+}
+
+/********** Private functions **********/
+
+static void xamine_parse_xmlxcb_file(XamineState *state, char *filename)
+{
+    xmlDoc  *doc;
+    xmlNode *root, *elem;
+    char *extension_xname;
+    XamineExtension *extension = NULL;
+    
+    /* FIXME: Remove this. */
+    printf("DEBUG: Parsing file \"%s\"\n", filename);
+    
+    /* Ignore text nodes consisting entirely of whitespace. */
+    xmlKeepBlanksDefault(0); 
+    
+    doc = xmlParseFile(filename);
+    if(!doc)
+        return;
+
+    root = xmlDocGetRootElement(doc);
+    if(!root)
+        return;
+
+    extension_xname = xmlGetProp(root, "extension-xname");
+
+    if(extension_xname)
+    {
+        /* FIXME: Remove this. */
+        printf("Extension: %s\n", extension_xname);
+
+        for(extension = state->extensions;
+            extension != NULL;
+            extension = extension->next)
+        {
+            if(strcmp(extension->xname, extension_xname) == 0)
+                break;
+        }
+        
+        if(extension == NULL)
+        {
+            extension = calloc(1, sizeof(XamineExtension));
+            extension->name = strdup(xmlGetProp(root, "extension-name"));
+            extension->xname = strdup(extension_xname);
+            extension->next = state->extensions;
+            state->extensions = extension;
+        }
+    }
+    else                           /* FIXME: Remove this. */
+        printf("Core Protocol\n");
+    
+    for(elem = root->children; elem != NULL;
+        elem = xamine_xml_next_elem(elem->next))
+    {
+        /* FIXME: Remove this */
+        {
+            char *name = xmlGetProp(elem, "name");
+            printf("DEBUG:    Parsing element \"%s\", name=\"%s\"\n",
+                   elem->name, name ? name : "<not present>");
+        }
+        
+        if(strcmp(elem->name, "request") == 0)
+        {
+            /* Not yet implemented. */
+        }
+        else if(strcmp(elem->name, "event") == 0)
+        {
+            char *no_sequence_number;
+            XamineDefinition *def;
+            XamineFieldDefinition *fields;
+            int number = atoi(xmlGetProp(elem, "number"));
+            if(number > 64)
+                continue;
+            def = calloc(1, sizeof(XamineDefinition));
+            def->name = xamine_make_name(extension, xmlGetProp(elem, "name"));
+            def->type = XAMINE_STRUCT;
+            
+            fields = xamine_parse_fields(state, elem);
+            if(fields == NULL)
+            {
+                fields = calloc(1, sizeof(XamineFieldDefinition));
+                fields->name = strdup("pad");
+                fields->definition = xamine_find_type(state, "CARD8");
+            }
+            def->fields = calloc(1, sizeof(XamineFieldDefinition));
+            def->fields->name = strdup("response_type");
+            def->fields->definition = xamine_find_type(state, "BYTE");
+            def->fields->next = fields;
+            fields = fields->next;
+            no_sequence_number = xmlGetProp(elem, "no-sequence-number");
+            if(no_sequence_number && strcmp(no_sequence_number, "true") == 0)
+            {
+                def->fields->next->next = fields;
+            }
+            else
+            {
+                def->fields->next->next =
+                    calloc(1, sizeof(XamineFieldDefinition));
+                def->fields->next->next->name = strdup("sequence");
+                def->fields->next->next->definition =
+                    xamine_find_type(state, "CARD16");
+                def->fields->next->next->next = fields;
+            }
+            def->next = state->definitions;
+            state->definitions = def;
+            
+            if(extension)
+            {
+                XamineEvent *event = calloc(1, sizeof(XamineEvent));
+                event->number = number;
+                event->definition = def;
+                event->next = extension->events;
+            }
+            else
+                state->core_events[number] = def;
+        }
+        else if(strcmp(elem->name, "eventcopy") == 0)
+        {
+            XamineDefinition *def;
+            int number = atoi(xmlGetProp(elem, "number"));
+            if(number > 64)
+                continue;
+            def = calloc(1, sizeof(XamineDefinition));
+            def->name = strdup(xmlGetProp(elem, "name"));
+            def->type = XAMINE_TYPEDEF;
+            def->ref = xamine_find_type(state, xmlGetProp(elem, "ref"));
+            
+            if(extension)
+            {
+                XamineEvent *event = calloc(1, sizeof(XamineEvent));
+                event->number = number;
+                event->definition = def;
+                event->next = extension->events;
+            }
+            else
+                state->core_events[number] = def;
+        }
+        else if(strcmp(elem->name, "error") == 0)
+        {
+        }
+        else if(strcmp(elem->name, "errorcopy") == 0)
+        {
+        }
+        else if(strcmp(elem->name, "struct") == 0)
+        {
+            XamineDefinition *def = calloc(1, sizeof(XamineDefinition));
+            def->name = xamine_make_name(extension, xmlGetProp(elem, "name"));
+            def->type = XAMINE_STRUCT;
+            def->fields = xamine_parse_fields(state, elem);
+            def->next = state->definitions;
+            state->definitions = def;
+        }
+        else if(strcmp(elem->name, "union") == 0)
+        {
+        }
+        else if(strcmp(elem->name, "xidtype") == 0)
+        {
+            XamineDefinition *def = calloc(1, sizeof(XamineDefinition));
+            def->name = xamine_make_name(extension, xmlGetProp(elem, "name"));
+            def->type = XAMINE_UNSIGNED;
+            def->size = 4;
+            def->next = state->definitions;
+            state->definitions = def;
+        }
+        else if(strcmp(elem->name, "enum") == 0)
+        {
+        }
+        else if(strcmp(elem->name, "typedef") == 0)
+        {
+            XamineDefinition *def = calloc(1, sizeof(XamineDefinition));
+            def->name = xamine_make_name(extension,
+                                         xmlGetProp(elem, "newname"));
+            def->type = XAMINE_TYPEDEF;
+            def->ref = xamine_find_type(state, xmlGetProp(elem, "oldname"));
+            def->next = state->definitions;
+            state->definitions = def;
+        }
+        else if(strcmp(elem->name, "import") == 0)
+        {
+        }
+    }
+}
+
+static char* xamine_make_name(XamineExtension *extension, char *name)
+{
+    if(extension)
+    {
+        char *temp = malloc(strlen(extension->name) + strlen(name) + 1);
+        if(temp == NULL)
+            return NULL;
+        strcpy(temp, extension->name);
+        strcat(temp, name);
+        return temp;
+    }
+    else
+        return strdup(name);
+}
+
+static XamineDefinition *xamine_find_type(XamineState *state, char *name)
+{
+    XamineDefinition *def;
+    for(def = state->definitions; def != NULL; def = def->next)
+    {
+        /* FIXME: does not work for extension types. */
+        if(strcmp(def->name, name) == 0)
+            return def;
+    }
+    return NULL;
+}
+
+static xmlNode *xamine_xml_next_elem(xmlNode *elem)
+{
+    while(elem && elem->type != XML_ELEMENT_NODE)
+        elem = elem->next;
+    return elem;
+}
+
+static XamineFieldDefinition *xamine_parse_fields(XamineState *state,
+                                                  xmlNode *elem)
+{
+    xmlNode *cur;
+    XamineFieldDefinition *head;
+    XamineFieldDefinition **tail = &head;
+    for(cur = elem->children; cur!=NULL; cur = xamine_xml_next_elem(cur->next))
+    {
+        /* FIXME: handle elements other than "field", "pad", and "list". */
+        *tail = calloc(1, sizeof(XamineFieldDefinition));
+        if(strcmp(cur->name, "pad") == 0)
+        {
+            (*tail)->name = "pad";
+            (*tail)->definition = xamine_find_type(state, "CARD8");
+            (*tail)->length = calloc(1, sizeof(XamineExpression));
+            (*tail)->length->type = XAMINE_VALUE;
+            (*tail)->length->value = atoi(xmlGetProp(cur, "bytes"));
+        }
+        else
+        {
+            (*tail)->name = strdup(xmlGetProp(cur, "name"));
+            (*tail)->definition = xamine_find_type(state,
+                                               xmlGetProp(cur, "type"));
+            /* FIXME: handle missing length expressions. */
+            if(strcmp(cur->name, "list") == 0)
+                (*tail)->length = xamine_parse_expression(state,
+                                                          cur->children);
+        }
+        tail = &((*tail)->next);
+    }
+    
+    *tail = NULL;
+    return head;
+}
+
+static XamineExpression *xamine_parse_expression(XamineState *state,
+                                                 xmlNode *elem)
+{
+    XamineExpression *e = calloc(1, sizeof(XamineExpression));
+    elem = xamine_xml_next_elem(elem);
+    if(strcmp(elem->name, "op") == 0)
+    {
+        char *temp = xmlGetProp(elem, "op");
+        e->type = XAMINE_OP;
+        if(strcmp(temp, "+") == 0)
+            e->op = XAMINE_ADD;
+        else if(strcmp(temp, "-") == 0)
+            e->op = XAMINE_SUBTRACT;
+        else if(strcmp(temp, "*") == 0)
+            e->op = XAMINE_MULTIPLY;
+        else if(strcmp(temp, "/") == 0)
+            e->op = XAMINE_DIVIDE;
+        else if(strcmp(temp, "<<") == 0)
+            e->op = XAMINE_LEFT_SHIFT;
+        else if(strcmp(temp, "&") == 0)
+            e->op = XAMINE_BITWISE_AND;
+        elem = xamine_xml_next_elem(elem->children);
+        e->left = xamine_parse_expression(state, elem);
+        elem = xamine_xml_next_elem(elem->next);
+        e->right = xamine_parse_expression(state, elem);
+    }
+    else if(strcmp(elem->name, "value") == 0)
+    {
+        e->type = XAMINE_VALUE;
+        e->value = strtol(elem->children->content, NULL, 0);
+    }
+    else if(strcmp(elem->name, "fieldref") == 0)
+    {
+        e->type = XAMINE_FIELDREF;
+        e->field = strdup(elem->children->content);
+    }
+    return e;
+}
+
+static long xamine_evaluate_expression(XamineExpression *expression,
+                                       XaminedItem *parent)
+{
+    switch(expression->type)
+    {
+    case XAMINE_VALUE:
+        return expression->value;
+        
+    case XAMINE_FIELDREF:
+    {
+        XaminedItem *cur;
+        for(cur = parent->child; cur != NULL; cur = cur->next)
+            if(strcmp(cur->name, expression->field) == 0)
+                switch(cur->definition->type)
+                {
+                case XAMINE_BOOLEAN: return cur->bool_value;
+                case XAMINE_CHAR: return cur->char_value;
+                case XAMINE_SIGNED: return cur->signed_value;
+                case XAMINE_UNSIGNED: return cur->unsigned_value;
+                }
+        /* FIXME: handle not found or wrong type */
+    }
+
+    case XAMINE_OP:
+    {
+        long left  = xamine_evaluate_expression(expression->left, parent);
+        long right = xamine_evaluate_expression(expression->right, parent);
+        switch(expression->op)
+        {
+        case XAMINE_ADD:         return left+right;
+        case XAMINE_SUBTRACT:    return left-right;
+        case XAMINE_MULTIPLY:    return left*right;
+        case XAMINE_DIVIDE:      return left/right; /* FIXME: divide by zero */
+        case XAMINE_LEFT_SHIFT:  return left<<right;
+        case XAMINE_BITWISE_AND: return left&right;
+        }
+    }
+    }
+}
+
+static XaminedItem *xamine_definition(XamineConversation *conversation,
+                                      void **data, unsigned int *size,
+                                      unsigned int *offset,
+                                      XamineDefinition *definition,
+                                      XaminedItem *parent)
+{
+    XaminedItem *xamined;
+
+    if(definition->type == XAMINE_TYPEDEF)
+    {
+        xamined = xamine_definition(conversation, data, size, offset,
+                                    definition->ref, parent);
+        xamined->definition = definition;
+        return xamined;
+    }
+
+    xamined = calloc(1, sizeof(XaminedItem));
+    xamined->definition = definition;
+    if(definition->type == XAMINE_STRUCT)
+    {
+        XaminedItem **end = &(xamined->child);
+        XamineFieldDefinition *child;
+        for(child = definition->fields; child != NULL; child = child->next)
+        {
+            *end = xamine_field_definition(conversation, data, size, offset,
+                                           child, xamined);
+            end = &((*end)->next);
+        }
+        *end = NULL;
+    }
+    else
+    {
+        switch(definition->type)
+        {
+        case XAMINE_BOOLEAN:
+            /* FIXME: field->definition->size must be 1 */
+            xamined->bool_value = *(unsigned char*)(*data) ? 1 : 0;
+            break;
+        
+        case XAMINE_CHAR:
+            /* FIXME: field->definition->size must be 1 */
+            xamined->char_value = *(char *)(*data);
+            break;
+            
+        case XAMINE_SIGNED:
+        case XAMINE_UNSIGNED:
+        {
+            unsigned char *dest = definition->type == XAMINE_SIGNED
+                                ? (unsigned char *)&(xamined->signed_value)
+                                : (unsigned char *)&(xamined->unsigned_value);
+            unsigned char *src = (unsigned char*)(*data);
+            if(definition->size == 1
+              || conversation->is_le == conversation->state->host_is_le)
+                memcpy(dest, src, definition->size);
+            else
+            {
+                int i;
+                dest += definition->size-1;
+                for(i = 0; i < definition->size; i++)
+                    *dest-- = *src++;
+            }
+        }
+        }
+        *data   += definition->size;
+        *size   -= definition->size;
+        *offset += definition->size;
+    }
+
+    return xamined;
+}
+
+static XaminedItem *xamine_field_definition(XamineConversation *conversation,
+                                            void **data, unsigned int *size,
+                                            unsigned int *offset,
+                                            XamineFieldDefinition *field,
+                                            XaminedItem *parent)
+{
+    XaminedItem *xamined;
+    
+    if(field->length)
+    {
+        xamined = calloc(1, sizeof(XaminedItem));
+        xamined->name = field->name;
+        xamined->definition = field->definition;
+        xamined->offset = *offset;
+        XaminedItem **end = &(xamined->child);
+        unsigned long length = xamine_evaluate_expression(field->length,
+                                                          parent);
+        unsigned long i;
+        for(i = 0; i < length; i++)
+        {
+            *end = xamine_definition(conversation, data, size, offset,
+                                     field->definition, parent);
+            (*end)->name = malloc(23); /* '[', length of 2**64, ']', '\0' */
+            sprintf((*end)->name, "[%lu]", i);
+            end = &((*end)->next);
+        }
+        *end = NULL;
+    }
+    else
+    {
+        xamined = xamine_definition(conversation, data, size, offset,
+                                    field->definition, parent);
+        xamined->name = field->name;
+    }
+    
+    return xamined;
+}
diff --git a/src/xamine.h b/src/xamine.h
new file mode 100644
index 0000000..8dea739
--- /dev/null
+++ b/src/xamine.h
@@ -0,0 +1,126 @@
+/* Xamine - X Protocol Analyzer
+ * Copyright (C) 2004-2005 Josh Triplett
+ * 
+ * This package is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ * 
+ * This package is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+ * License for more details.
+ */
+#ifndef XAMINE_H
+#define XAMINE_H
+
+typedef enum
+{
+    XAMINE_BOOLEAN,
+    XAMINE_CHAR,
+    XAMINE_SIGNED,
+    XAMINE_UNSIGNED,
+    XAMINE_STRUCT,
+    XAMINE_UNION,
+    XAMINE_TYPEDEF
+} XamineType;
+
+typedef enum
+{
+    XAMINE_REQUEST,
+    XAMINE_RESPONSE
+} XamineDirection;
+
+typedef struct XamineDefinition
+{
+    char *name;
+    XamineType type;
+    union
+    {
+        unsigned int size;                    /* base types */
+        struct XamineFieldDefinition *fields; /* struct, union */
+        struct XamineDefinition *ref;         /* typedef */
+    };
+    struct XamineDefinition *next;
+} XamineDefinition;
+
+typedef enum XamineExpressionType
+{
+    XAMINE_FIELDREF,
+    XAMINE_VALUE,
+    XAMINE_OP
+} XamineExpressionType;
+
+typedef enum XamineOp
+{
+    XAMINE_ADD,
+    XAMINE_SUBTRACT,
+    XAMINE_MULTIPLY,
+    XAMINE_DIVIDE,
+    XAMINE_LEFT_SHIFT,
+    XAMINE_BITWISE_AND
+} XamineOp;
+
+typedef struct XamineExpression
+{
+    XamineExpressionType type;
+    union
+    {
+        char *field;         /* Field name for XAMINE_FIELDREF */
+        unsigned long value; /* Value for XAMINE_VALUE */
+        struct               /* Operator and operands for XAMINE_OP */
+        {
+            XamineOp op;
+            struct XamineExpression *left;
+            struct XamineExpression *right;
+        };
+    };
+} XamineExpression;
+
+typedef struct XamineFieldDefinition
+{
+    char *name;
+    XamineDefinition *definition;
+    XamineExpression *length;           /* List length; NULL for non-list */
+    struct XamineFieldDefinition *next;
+} XamineFieldDefinition;
+
+typedef struct XaminedItem
+{
+    char *name;
+    XamineDefinition *definition;
+    unsigned int offset;
+    union
+    {
+        unsigned char bool_value;
+        char          char_value;
+        signed long   signed_value;
+        unsigned long unsigned_value;
+    };
+    struct XaminedItem *child;
+    struct XaminedItem *next;
+} XaminedItem;
+
+/* Opaque types for an Xamine library state and a conversation-specific
+ * state. */
+typedef struct XamineState XamineState;
+typedef struct XamineConversation XamineConversation;
+
+/* Initialization and cleanup */
+extern XamineState * xamine_init();
+extern void xamine_cleanup(XamineState *state);
+
+/* Retrieval of the type definitions. */
+extern XamineDefinition * xamine_get_definitions(XamineState *state);
+
+/* Creation and destruction of conversations. */
+extern XamineConversation * xamine_create_conversation(XamineState *state);
+extern void xamine_free_conversation(XamineConversation *conversation);
+
+/* Analysis */
+extern XaminedItem * xamine(XamineConversation *conversation,
+                            XamineDirection dir,
+                            void *data, unsigned int size);
+extern void xamine_free(XaminedItem *item);
+
+#endif /* XAMINE_H */