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io: Make sure not to pass partial UTF-8 to write callback

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We cannot split UTF-8 at arbitrary boundaries.
This commit is contained in:
Nick Wellnhofer 2024-09-14 00:03:56 +02:00
parent c46b89e243
commit 55ddccb645
1 changed files with 66 additions and 78 deletions
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22
xmlIO.c
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@ -2233,23 +2233,16 @@ xmlParserInputBufferRead(xmlParserInputBufferPtr in, int len) {
*/
int
xmlOutputBufferWrite(xmlOutputBufferPtr out, int len, const char *data) {
xmlBufPtr buf = NULL;
size_t written = 0;
int ret;
if ((out == NULL) || (out->error))
return(-1);
if (len < 0)
return(0);
while (len > 0) {
xmlBufPtr buf = NULL;
int chunk;
int ret;
chunk = len;
if (chunk > 256 * 1024)
chunk = 256 * 1024;
ret = xmlBufAdd(out->buffer, (const xmlChar *) data, chunk);
ret = xmlBufAdd(out->buffer, (const xmlChar *) data, len);
if (ret != 0) {
out->error = XML_ERR_NO_MEMORY;
return(-1);
@ -2284,15 +2277,13 @@ xmlOutputBufferWrite(xmlOutputBufferPtr out, int len, const char *data) {
if (out->writecallback)
buf = out->conv;
else
written += ret;
written = ret;
} else {
if (out->writecallback)
buf = out->buffer;
else
written += chunk;
written = len;
}
data += chunk;
len -= chunk;
if ((buf != NULL) && (out->writecallback)) {
/*
@ -2303,8 +2294,6 @@ xmlOutputBufferWrite(xmlOutputBufferPtr out, int len, const char *data) {
if (nbchars < MINLEN)
break;
if (nbchars > 256 * 1024)
nbchars = 256 * 1024;
ret = out->writecallback(out->context,
(const char *)xmlBufContent(buf), nbchars);
@ -2325,7 +2314,6 @@ xmlOutputBufferWrite(xmlOutputBufferPtr out, int len, const char *data) {
out->written += ret;
}
}
}
return(written <= INT_MAX ? written : INT_MAX);
}