kolibrios/contrib/media/updf/xps/xps_xml.c

388 lines
7.4 KiB
C
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#include "fitz.h"
#include "muxps.h"
struct attribute
{
char name[40];
char *value;
struct attribute *next;
};
struct element
{
char name[40];
struct attribute *atts;
struct element *up, *down, *next;
};
struct parser
{
struct element *head;
};
static inline void indent(int n)
{
while (n--) putchar(' ');
}
void xml_print_element(struct element *item, int level)
{
while (item) {
struct attribute *att;
indent(level);
printf("<%s", item->name);
for (att = item->atts; att; att = att->next)
printf(" %s=\"%s\"", att->name, att->value);
if (item->down) {
printf(">\n");
xml_print_element(item->down, level + 1);
indent(level);
printf("</%s>\n", item->name);
}
else {
printf("/>\n");
}
item = item->next;
}
}
struct element *xml_next(struct element *item)
{
return item->next;
}
struct element *xml_down(struct element *item)
{
return item->down;
}
char *xml_tag(struct element *item)
{
return item->name;
}
char *xml_att(struct element *item, const char *name)
{
struct attribute *att;
for (att = item->atts; att; att = att->next)
if (!strcmp(att->name, name))
return att->value;
return NULL;
}
static void xml_free_attribute(struct attribute *att)
{
while (att) {
struct attribute *next = att->next;
if (att->value)
fz_free(att->value);
fz_free(att);
att = next;
}
}
void xml_free_element(struct element *item)
{
while (item) {
struct element *next = item->next;
if (item->atts)
xml_free_attribute(item->atts);
if (item->down)
xml_free_element(item->down);
fz_free(item);
item = next;
}
}
static int xml_parse_entity(int *c, char *a)
{
char *b;
if (a[1] == '#') {
if (a[2] == 'x')
*c = strtol(a + 3, &b, 16);
else
*c = strtol(a + 2, &b, 10);
if (*b == ';')
return b - a + 1;
}
else if (a[1] == 'l' && a[2] == 't' && a[3] == ';') {
*c = '<';
return 4;
}
else if (a[1] == 'g' && a[2] == 't' && a[3] == ';') {
*c = '>';
return 4;
}
else if (a[1] == 'a' && a[2] == 'm' && a[3] == 'p' && a[4] == ';') {
*c = '&';
return 5;
}
else if (a[1] == 'a' && a[2] == 'p' && a[3] == 'o' && a[4] == 's' && a[5] == ';') {
*c = '\'';
return 6;
}
else if (a[1] == 'q' && a[2] == 'u' && a[3] == 'o' && a[4] == 't' && a[5] == ';') {
*c = '"';
return 6;
}
*c = *a++;
return 1;
}
static void xml_emit_open_tag(struct parser *parser, char *a, char *b)
{
struct element *head, *tail;
head = fz_malloc(sizeof(struct element));
if (b - a > sizeof(head->name))
b = a + sizeof(head->name);
memcpy(head->name, a, b - a);
head->name[b - a] = 0;
head->atts = NULL;
head->up = parser->head;
head->down = NULL;
head->next = NULL;
if (!parser->head->down) {
parser->head->down = head;
}
else {
tail = parser->head->down;
while (tail->next)
tail = tail->next;
tail->next = head;
}
parser->head = head;
}
static void xml_emit_att_name(struct parser *parser, char *a, char *b)
{
struct element *head = parser->head;
struct attribute *att;
att = fz_malloc(sizeof(struct attribute));
if (b - a > sizeof(att->name))
b = a + sizeof(att->name);
memcpy(att->name, a, b - a);
att->name[b - a] = 0;
att->value = NULL;
att->next = head->atts;
head->atts = att;
}
static void xml_emit_att_value(struct parser *parser, char *a, char *b)
{
struct element *head = parser->head;
struct attribute *att = head->atts;
char *s;
int c;
/* entities are all longer than UTFmax so runetochar is safe */
s = att->value = fz_malloc(b - a + 1);
while (a < b) {
if (*a == '&') {
a += xml_parse_entity(&c, a);
s += runetochar(s, &c);
}
else {
*s++ = *a++;
}
}
*s = 0;
}
static void xml_emit_close_tag(struct parser *parser)
{
if (parser->head->up)
parser->head = parser->head->up;
}
static inline int isname(int c)
{
return c == '.' || c == '-' || c == '_' || c == ':' ||
(c >= '0' && c <= '9') ||
(c >= 'A' && c <= 'Z') ||
(c >= 'a' && c <= 'z');
}
static inline int iswhite(int c)
{
return c == ' ' || c == '\r' || c == '\n' || c == '\t';
}
static char *xml_parse_document_imp(struct parser *x, char *p)
{
char *mark;
int quote;
parse_text:
mark = p;
while (*p && *p != '<') ++p;
if (*p == '<') { ++p; goto parse_element; }
return NULL;
parse_element:
if (*p == '/') { ++p; goto parse_closing_element; }
if (*p == '!') { ++p; goto parse_comment; }
if (*p == '?') { ++p; goto parse_processing_instruction; }
while (iswhite(*p)) ++p;
if (isname(*p))
goto parse_element_name;
return "syntax error in element";
parse_comment:
if (*p == '[') goto parse_cdata;
if (*p++ != '-') return "syntax error in comment (<! not followed by --)";
if (*p++ != '-') return "syntax error in comment (<!- not followed by -)";
mark = p;
while (*p) {
if (p[0] == '-' && p[1] == '-' && p[2] == '>') {
p += 3;
goto parse_text;
}
++p;
}
return "end of data in comment";
parse_cdata:
if (p[1] != 'C' || p[2] != 'D' || p[3] != 'A' || p[4] != 'T' || p[5] != 'A' || p[6] != '[')
return "syntax error in CDATA section";
p += 7;
mark = p;
while (*p) {
if (p[0] == ']' && p[1] == ']' && p[2] == '>') {
p += 3;
goto parse_text;
}
++p;
}
return "end of data in CDATA section";
parse_processing_instruction:
while (*p) {
if (p[0] == '?' && p[1] == '>') {
p += 2;
goto parse_text;
}
++p;
}
return "end of data in processing instruction";
parse_closing_element:
while (iswhite(*p)) ++p;
mark = p;
while (isname(*p)) ++p;
while (iswhite(*p)) ++p;
if (*p != '>')
return "syntax error in closing element";
xml_emit_close_tag(x);
++p;
goto parse_text;
parse_element_name:
mark = p;
while (isname(*p)) ++p;
xml_emit_open_tag(x, mark, p);
if (*p == '>') { ++p; goto parse_text; }
if (p[0] == '/' && p[1] == '>') {
xml_emit_close_tag(x);
p += 2;
goto parse_text;
}
if (iswhite(*p))
goto parse_attributes;
return "syntax error after element name";
parse_attributes:
while (iswhite(*p)) ++p;
if (isname(*p))
goto parse_attribute_name;
if (*p == '>') { ++p; goto parse_text; }
if (p[0] == '/' && p[1] == '>') {
xml_emit_close_tag(x);
p += 2;
goto parse_text;
}
return "syntax error in attributes";
parse_attribute_name:
mark = p;
while (isname(*p)) ++p;
xml_emit_att_name(x, mark, p);
while (iswhite(*p)) ++p;
if (*p == '=') { ++p; goto parse_attribute_value; }
return "syntax error after attribute name";
parse_attribute_value:
while (iswhite(*p)) ++p;
quote = *p++;
if (quote != '"' && quote != '\'')
return "missing quote character";
mark = p;
while (*p && *p != quote) ++p;
if (*p == quote) {
xml_emit_att_value(x, mark, p++);
goto parse_attributes;
}
return "end of data in attribute value";
}
static char *convert_to_utf8(unsigned char *s, int n)
{
unsigned char *e = s + n;
char *dst, *d;
int c;
if (s[0] == 0xFE && s[1] == 0xFF) {
dst = d = fz_malloc(n * 2);
while (s + 1 < e) {
c = s[0] << 8 | s[1];
d += runetochar(d, &c);
s += 2;
}
*d = 0;
return dst;
}
if (s[0] == 0xFF && s[1] == 0xFE) {
dst = d = fz_malloc(n * 2);
while (s + 1 < e) {
c = s[0] | s[1] << 8;
d += runetochar(d, &c);
s += 2;
}
*d = 0;
return dst;
}
return (char*)s;
}
struct element *
xml_parse_document(unsigned char *s, int n)
{
struct parser parser;
struct element root;
char *p, *error;
/* s is already null-terminated (see xps_new_part) */
memset(&root, 0, sizeof(root));
parser.head = &root;
p = convert_to_utf8(s, n);
error = xml_parse_document_imp(&parser, p);
if (error) {
fz_throw(error);
return NULL;
}
if (p != (char*)s)
fz_free(p);
return root.down;
}