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-rw-r--r--xml.c454
1 files changed, 454 insertions, 0 deletions
diff --git a/xml.c b/xml.c
new file mode 100644
index 0000000..f7e000b
--- /dev/null
+++ b/xml.c
@@ -0,0 +1,454 @@
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "xml.h"
+
+static void
+xml_parseattrs(XMLParser *x)
+{
+ size_t namelen = 0, valuelen;
+ int c, endsep, endname = 0, valuestart = 0;
+
+ while ((c = GETNEXT()) != EOF) {
+ if (isspace(c)) {
+ if (namelen)
+ endname = 1;
+ continue;
+ } else if (c == '?')
+ ; /* ignore */
+ else if (c == '=') {
+ x->name[namelen] = '\0';
+ valuestart = 1;
+ endname = 1;
+ } else if (namelen && ((endname && !valuestart && isalpha(c)) || (c == '>' || c == '/'))) {
+ /* attribute without value */
+ x->name[namelen] = '\0';
+ if (x->xmlattrstart)
+ x->xmlattrstart(x, x->tag, x->taglen, x->name, namelen);
+ if (x->xmlattr)
+ x->xmlattr(x, x->tag, x->taglen, x->name, namelen, "", 0);
+ if (x->xmlattrend)
+ x->xmlattrend(x, x->tag, x->taglen, x->name, namelen);
+ endname = 0;
+ x->name[0] = c;
+ namelen = 1;
+ } else if (namelen && valuestart) {
+ /* attribute with value */
+ if (x->xmlattrstart)
+ x->xmlattrstart(x, x->tag, x->taglen, x->name, namelen);
+
+ valuelen = 0;
+ if (c == '\'' || c == '"') {
+ endsep = c;
+ } else {
+ endsep = ' '; /* isspace() */
+ goto startvalue;
+ }
+
+ while ((c = GETNEXT()) != EOF) {
+startvalue:
+ if (c == '&') { /* entities */
+ x->data[valuelen] = '\0';
+ /* call data function with data before entity if there is data */
+ if (valuelen && x->xmlattr)
+ x->xmlattr(x, x->tag, x->taglen, x->name, namelen, x->data, valuelen);
+ x->data[0] = c;
+ valuelen = 1;
+ while ((c = GETNEXT()) != EOF) {
+ if (c == endsep || (endsep == ' ' && (c == '>' || isspace(c))))
+ break;
+ if (valuelen < sizeof(x->data) - 1)
+ x->data[valuelen++] = c;
+ else {
+ /* entity too long for buffer, handle as normal data */
+ x->data[valuelen] = '\0';
+ if (x->xmlattr)
+ x->xmlattr(x, x->tag, x->taglen, x->name, namelen, x->data, valuelen);
+ x->data[0] = c;
+ valuelen = 1;
+ break;
+ }
+ if (c == ';') {
+ x->data[valuelen] = '\0';
+ if (x->xmlattrentity)
+ x->xmlattrentity(x, x->tag, x->taglen, x->name, namelen, x->data, valuelen);
+ valuelen = 0;
+ break;
+ }
+ }
+ } else if (c != endsep && !(endsep == ' ' && (c == '>' || isspace(c)))) {
+ if (valuelen < sizeof(x->data) - 1) {
+ x->data[valuelen++] = c;
+ } else {
+ x->data[valuelen] = '\0';
+ if (x->xmlattr)
+ x->xmlattr(x, x->tag, x->taglen, x->name, namelen, x->data, valuelen);
+ x->data[0] = c;
+ valuelen = 1;
+ }
+ }
+ if (c == endsep || (endsep == ' ' && (c == '>' || isspace(c)))) {
+ x->data[valuelen] = '\0';
+ if (x->xmlattr)
+ x->xmlattr(x, x->tag, x->taglen, x->name, namelen, x->data, valuelen);
+ if (x->xmlattrend)
+ x->xmlattrend(x, x->tag, x->taglen, x->name, namelen);
+ break;
+ }
+ }
+ namelen = endname = valuestart = 0;
+ } else if (namelen < sizeof(x->name) - 1) {
+ x->name[namelen++] = c;
+ }
+ if (c == '>') {
+ break;
+ } else if (c == '/') {
+ x->isshorttag = 1;
+ x->name[0] = '\0';
+ namelen = 0;
+ }
+ }
+}
+
+static void
+xml_parsecomment(XMLParser *x)
+{
+ size_t datalen = 0, i = 0;
+ int c;
+
+ if (x->xmlcommentstart)
+ x->xmlcommentstart(x);
+ while ((c = GETNEXT()) != EOF) {
+ if (c == '-' || c == '>') {
+ if (x->xmlcomment && datalen) {
+ x->data[datalen] = '\0';
+ x->xmlcomment(x, x->data, datalen);
+ datalen = 0;
+ }
+ }
+
+ if (c == '-') {
+ if (++i > 2) {
+ if (x->xmlcomment)
+ for (; i > 2; i--)
+ x->xmlcomment(x, "-", 1);
+ i = 2;
+ }
+ continue;
+ } else if (c == '>' && i == 2) {
+ if (x->xmlcommentend)
+ x->xmlcommentend(x);
+ return;
+ } else if (i) {
+ if (x->xmlcomment) {
+ for (; i > 0; i--)
+ x->xmlcomment(x, "-", 1);
+ }
+ i = 0;
+ }
+
+ if (datalen < sizeof(x->data) - 1) {
+ x->data[datalen++] = c;
+ } else {
+ x->data[datalen] = '\0';
+ if (x->xmlcomment)
+ x->xmlcomment(x, x->data, datalen);
+ x->data[0] = c;
+ datalen = 1;
+ }
+ }
+}
+
+static void
+xml_parsecdata(XMLParser *x)
+{
+ size_t datalen = 0, i = 0;
+ int c;
+
+ if (x->xmlcdatastart)
+ x->xmlcdatastart(x);
+ while ((c = GETNEXT()) != EOF) {
+ if (c == ']' || c == '>') {
+ if (x->xmlcdata && datalen) {
+ x->data[datalen] = '\0';
+ x->xmlcdata(x, x->data, datalen);
+ datalen = 0;
+ }
+ }
+
+ if (c == ']') {
+ if (++i > 2) {
+ if (x->xmlcdata)
+ for (; i > 2; i--)
+ x->xmlcdata(x, "]", 1);
+ i = 2;
+ }
+ continue;
+ } else if (c == '>' && i == 2) {
+ if (x->xmlcdataend)
+ x->xmlcdataend(x);
+ return;
+ } else if (i) {
+ if (x->xmlcdata)
+ for (; i > 0; i--)
+ x->xmlcdata(x, "]", 1);
+ i = 0;
+ }
+
+ if (datalen < sizeof(x->data) - 1) {
+ x->data[datalen++] = c;
+ } else {
+ x->data[datalen] = '\0';
+ if (x->xmlcdata)
+ x->xmlcdata(x, x->data, datalen);
+ x->data[0] = c;
+ datalen = 1;
+ }
+ }
+}
+
+static int
+codepointtoutf8(long r, char *s)
+{
+ if (r == 0) {
+ return 0; /* NUL byte */
+ } else if (r <= 0x7F) {
+ /* 1 byte: 0aaaaaaa */
+ s[0] = r;
+ return 1;
+ } else if (r <= 0x07FF) {
+ /* 2 bytes: 00000aaa aabbbbbb */
+ s[0] = 0xC0 | ((r & 0x0007C0) >> 6); /* 110aaaaa */
+ s[1] = 0x80 | (r & 0x00003F); /* 10bbbbbb */
+ return 2;
+ } else if (r <= 0xFFFF) {
+ /* 3 bytes: aaaabbbb bbcccccc */
+ s[0] = 0xE0 | ((r & 0x00F000) >> 12); /* 1110aaaa */
+ s[1] = 0x80 | ((r & 0x000FC0) >> 6); /* 10bbbbbb */
+ s[2] = 0x80 | (r & 0x00003F); /* 10cccccc */
+ return 3;
+ } else {
+ /* 4 bytes: 000aaabb bbbbcccc ccdddddd */
+ s[0] = 0xF0 | ((r & 0x1C0000) >> 18); /* 11110aaa */
+ s[1] = 0x80 | ((r & 0x03F000) >> 12); /* 10bbbbbb */
+ s[2] = 0x80 | ((r & 0x000FC0) >> 6); /* 10cccccc */
+ s[3] = 0x80 | (r & 0x00003F); /* 10dddddd */
+ return 4;
+ }
+}
+
+static int
+namedentitytostr(const char *e, char *buf, size_t bufsiz)
+{
+ static const struct {
+ const char *entity;
+ int c;
+ } entities[] = {
+ { "amp;", '&' },
+ { "lt;", '<' },
+ { "gt;", '>' },
+ { "apos;", '\'' },
+ { "quot;", '"' },
+ };
+ size_t i;
+
+ /* buffer is too small */
+ if (bufsiz < 2)
+ return -1;
+
+ for (i = 0; i < sizeof(entities) / sizeof(*entities); i++) {
+ if (!strcmp(e, entities[i].entity)) {
+ buf[0] = entities[i].c;
+ buf[1] = '\0';
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int
+numericentitytostr(const char *e, char *buf, size_t bufsiz)
+{
+ long l;
+ int len;
+ char *end;
+
+ /* buffer is too small */
+ if (bufsiz < 5)
+ return -1;
+
+ errno = 0;
+ /* hex (16) or decimal (10) */
+ if (*e == 'x')
+ l = strtoul(e + 1, &end, 16);
+ else
+ l = strtoul(e, &end, 10);
+ /* invalid value or not a well-formed entity or too high codepoint */
+ if (errno || *end != ';' || l > 0x10FFFF)
+ return 0;
+ len = codepointtoutf8(l, buf);
+ buf[len] = '\0';
+
+ return len;
+}
+
+/* convert named- or numeric entity string to buffer string
+ * returns byte-length of string. */
+int
+xml_entitytostr(const char *e, char *buf, size_t bufsiz)
+{
+ /* doesn't start with & */
+ if (e[0] != '&')
+ return 0;
+ /* numeric entity */
+ if (e[1] == '#')
+ return numericentitytostr(e + 2, buf, bufsiz);
+ else /* named entity */
+ return namedentitytostr(e + 1, buf, bufsiz);
+}
+
+void
+xml_parse(XMLParser *x)
+{
+ size_t datalen, tagdatalen;
+ int c, isend;
+
+ while ((c = GETNEXT()) != EOF && c != '<')
+ ; /* skip until < */
+
+ while (c != EOF) {
+ if (c == '<') { /* parse tag */
+ if ((c = GETNEXT()) == EOF)
+ return;
+
+ if (c == '!') { /* cdata and comments */
+ for (tagdatalen = 0; (c = GETNEXT()) != EOF;) {
+ /* NOTE: sizeof(x->data) must be atleast sizeof("[CDATA[") */
+ if (tagdatalen <= sizeof("[CDATA[") - 1)
+ x->data[tagdatalen++] = c;
+ if (c == '>')
+ break;
+ else if (c == '-' && tagdatalen == sizeof("--") - 1 &&
+ (x->data[0] == '-')) {
+ xml_parsecomment(x);
+ break;
+ } else if (c == '[') {
+ if (tagdatalen == sizeof("[CDATA[") - 1 &&
+ !strncmp(x->data, "[CDATA[", tagdatalen)) {
+ xml_parsecdata(x);
+ break;
+ }
+ }
+ }
+ } else {
+ /* normal tag (open, short open, close), processing instruction. */
+ x->tag[0] = c;
+ x->taglen = 1;
+ x->isshorttag = isend = 0;
+
+ /* treat processing instruction as shorttag, don't strip "?" prefix. */
+ if (c == '?') {
+ x->isshorttag = 1;
+ } else if (c == '/') {
+ if ((c = GETNEXT()) == EOF)
+ return;
+ x->tag[0] = c;
+ isend = 1;
+ }
+
+ while ((c = GETNEXT()) != EOF) {
+ if (c == '/')
+ x->isshorttag = 1; /* short tag */
+ else if (c == '>' || isspace(c)) {
+ x->tag[x->taglen] = '\0';
+ if (isend) { /* end tag, starts with </ */
+ if (x->xmltagend)
+ x->xmltagend(x, x->tag, x->taglen, x->isshorttag);
+ x->tag[0] = '\0';
+ x->taglen = 0;
+ } else {
+ /* start tag */
+ if (x->xmltagstart)
+ x->xmltagstart(x, x->tag, x->taglen);
+ if (isspace(c))
+ xml_parseattrs(x);
+ if (x->xmltagstartparsed)
+ x->xmltagstartparsed(x, x->tag, x->taglen, x->isshorttag);
+ }
+ /* call tagend for shortform or processing instruction */
+ if (x->isshorttag) {
+ if (x->xmltagend)
+ x->xmltagend(x, x->tag, x->taglen, x->isshorttag);
+ x->tag[0] = '\0';
+ x->taglen = 0;
+ }
+ break;
+ } else if (x->taglen < sizeof(x->tag) - 1)
+ x->tag[x->taglen++] = c; /* NOTE: tag name truncation */
+ }
+ }
+ } else {
+ /* parse tag data */
+ datalen = 0;
+ if (x->xmldatastart)
+ x->xmldatastart(x);
+ while ((c = GETNEXT()) != EOF) {
+ if (c == '&') {
+ if (datalen) {
+ x->data[datalen] = '\0';
+ if (x->xmldata)
+ x->xmldata(x, x->data, datalen);
+ }
+ x->data[0] = c;
+ datalen = 1;
+ while ((c = GETNEXT()) != EOF) {
+ if (c == '<')
+ break;
+ if (datalen < sizeof(x->data) - 1)
+ x->data[datalen++] = c;
+ else {
+ /* entity too long for buffer, handle as normal data */
+ x->data[datalen] = '\0';
+ if (x->xmldata)
+ x->xmldata(x, x->data, datalen);
+ x->data[0] = c;
+ datalen = 1;
+ break;
+ }
+ if (c == ';') {
+ x->data[datalen] = '\0';
+ if (x->xmldataentity)
+ x->xmldataentity(x, x->data, datalen);
+ datalen = 0;
+ break;
+ }
+ }
+ } else if (c != '<') {
+ if (datalen < sizeof(x->data) - 1) {
+ x->data[datalen++] = c;
+ } else {
+ x->data[datalen] = '\0';
+ if (x->xmldata)
+ x->xmldata(x, x->data, datalen);
+ x->data[0] = c;
+ datalen = 1;
+ }
+ }
+ if (c == '<') {
+ x->data[datalen] = '\0';
+ if (x->xmldata && datalen)
+ x->xmldata(x, x->data, datalen);
+ if (x->xmldataend)
+ x->xmldataend(x);
+ break;
+ }
+ }
+ }
+ }
+}
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