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#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <yaml/yaml.h>
#include <assert.h>
/* Check for the UTF-16-BE BOM. */
#define IS_UTF16BE_BOM(pointer) ((pointer)[0] == 0xFE && (pointer)[1] == 0xFF)
/* Check for the UTF-16-LE BOM. */
#define IS_UTF16LE_BOM(pointer) ((pointer)[0] == 0xFF && (pointer)[1] == 0xFE)
/* Get a UTF-16-BE character. */
#define UTF16BE_CHAR(pointer) ((pointer)[0] << 8 + (pointer)[1])
/* Get a UTF-16-LE character. */
#define UTF16LE_CHAR(pointer) ((pointer)[0] + (pointer)[1] << 8)
/*
* From http://www.ietf.org/rfc/rfc3629.txt:
*
* Char. number range | UTF-8 octet sequence
* (hexadecimal) | (binary)
* --------------------+---------------------------------------------
* 0000 0000-0000 007F | 0xxxxxxx
* 0000 0080-0000 07FF | 110xxxxx 10xxxxxx
* 0000 0800-0000 FFFF | 1110xxxx 10xxxxxx 10xxxxxx
* 0001 0000-0010 FFFF | 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
*/
/* Get the length of a UTF-8 character (0 on error). */
#define UTF8_LENGTH(pointer) \
((pointer)[0] < 0x80 ? 1 : \
(pointer)[0] < 0xC0 ? 0 : \
(pointer)[0] < 0xE0 ? 2 : \
(pointer)[0] < 0xF0 ? 3 : \
(pointer)[0] < 0xF8 ? 4 : 0)
/* Get the value of the first byte of a UTF-8 sequence (0xFF on error). */
#define UTF8_FIRST_CHUNK(pointer) \
((pointer)[0] < 0x80 ? (pointer)[0] & 0x7F : \
(pointer)[0] < 0xC0 ? 0xFF : \
(pointer)[0] < 0xE0 ? (pointer)[0] & 0x1F : \
(pointer)[0] < 0xF0 ? (pointer)[0] & 0x0F : \
(pointer)[0] < 0xF8 ? (pointer)[0] & 0x07 : 0xFF)
/* Get the value of a non-first byte of a UTF-8 sequence (0xFF on error). */
#define UTF8_NEXT_CHUNK(pointer) \
((pointer)[0] >= 0x80 && (pointer)[0] < 0xC0 ? (pointer)[0] & 0x3F : 0xFF)
/* Determine the length of a UTF-8 character. */
/*
* Ensure that the buffer contains at least length characters.
* Return 1 on success, 0 on failure.
*
* The length is supposed to be significantly less that the buffer size.
*/
int
yaml_parser_update_buffer(yaml_parser_t *parser, size_t length)
{
/* If the EOF flag is set, do nothing. */
if (parser->eof)
return 1;
/* Return if the buffer contains enough characters. */
if (parser->unread >= length)
return 1;
/* Determine the input encoding if it is not known yet. */
if (!parser->encoding) {
if (!yaml_parser_determine_encoding(parser))
return 0;
}
/* Move the unread characters to the beginning of the buffer. */
if (parser->buffer < parser->pointer
&& parser->pointer < parser->buffer_end) {
size_t size = parser->buffer_end - parser->pointer;
memmove(parser->buffer, parser->pointer, size);
parser->pointer = parser->buffer;
parser->buffer_end -= size;
}
else if (parser->pointer == parser->buffer_end) {
parser->pointer = parser->buffer;
parser->buffer_end = parser->buffer;
}
/* Fill the buffer until it has enough characters. */
while (parser->unread < length)
{
/* Fill the raw buffer. */
if (!yaml_parser_update_raw_buffer(parser)) return 0;
/* Decode the raw buffer. */
while (parser->raw_unread)
{
unsigned int ch;
int incomplete = 0;
/* Decode the next character. */
switch (parser->encoding)
{
case YAML_UTF8_ENCODING:
unsigned int utf8_length = UTF8_LENGTH(parser->raw_pointer);
unsigned int utf8_chunk;
/* Check if the raw buffer contains an incomplete character. */
if (utf8_length > parser->raw_unread) {
if (parser->eof) {
parser->error = YAML_READER_ERROR;
return 0;
}
incomplete = 1;
}
/* Get the character checking it for validity. */
utf8_chunk = UTF8_FIRST_CHUNK(parser->raw_pointer ++);
if (utf8_chunk == 0xFF) {
parser->error = YAML_READER_ERROR;
return 0;
}
ch = utf8_chunk;
parser->raw_unread --;
while (-- utf8_length) {
utf8_chunk = UTF8_NEXT_CHUNK(parser->raw_pointer ++);
if (utf8_chunk == 0xFF) {
parser->error = YAML_READER_ERROR;
return 0;
}
ch = ch << 6 + utf8_chunk;
parser->raw_unread --;
}
break;
case YAML_UTF16LE_ENCODING:
/* Check if the raw buffer contains an incomplete character. */
if (parser->raw_unread < 2) {
if (parser->eof) {
parser->error = YAML_READER_ERROR;
return 0;
}
incomplete = 1;
}
/* Get the current character. */
ch = UTF16LE_CHAR(parser->raw_pointer);
parser->raw_pointer += 2;
parser->raw_unread -= 2;
break;
case YAML_UTF16BE_ENCODING:
/* Check if the raw buffer contains an incomplete character. */
if (parser->raw_unread < 2) {
if (parser->eof) {
parser->error = YAML_READER_ERROR;
return 0;
}
incomplete = 1;
}
/* Get the current character. */
ch = UTF16BE_CHAR(parser->raw_pointer);
parser->raw_pointer += 2;
parser->raw_unread -= 2;
break;
}
/*
* Check if the character is in the allowed range:
* #x9 | #xA | #xD | [#x20-#x7E] (8 bit)
* | #x85 | [#xA0-#xD7FF] | [#xE000-#xFFFD] (16 bit)
* | [#x10000-#x10FFFF] (32 bit)
*/
if (! (ch == 0x09 || ch == 0x0A || ch == 0x0D
|| (ch >= 0x20 && ch <= 0x7E)
|| (ch == 0x85) || (ch >= 0xA0 && ch <= 0xD7FF)
|| (ch >= 0xE000 && ch <= 0xFFFD)
|| (ch >= 0x10000 && ch <= 0x10FFFF))) {
parser->error = YAML_READER_ERROR;
return 0;
}
/* Finally put the character into the buffer. */
/* 0000 0000-0000 007F -> 0xxxxxxx */
if (ch <= 0x7F) {
*(parser->buffer_end++) = ch;
}
/* 0000 0080-0000 07FF -> 110xxxxx 10xxxxxx */
else if (ch <= 0x7FF) {
*(parser->buffer_end++) = 0xC0 + (ch >> 6) & 0x1F;
*(parser->buffer_end++) = 0x80 + ch & 0x3F;
}
/* 0000 0800-0000 FFFF -> 1110xxxx 10xxxxxx 10xxxxxx */
else if (ch <= 0xFFFF) {
*(parser->buffer_end++) = 0x80 + ch & 0x3F;
*(parser->buffer_end++) = 0xC0 + (ch >> 6) & 0x1F;
}
/* 0001 0000-0010 FFFF -> 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
else {
}
}
}
}
/*
* Determine the input stream encoding by checking the BOM symbol. If no BOM is
* found, the UTF-8 encoding is assumed. Return 1 on success, 0 on failure.
*/
int
yaml_parser_determine_encoding(yaml_parser_t *parser)
{
/* Ensure that we had enough bytes in the raw buffer. */
while (!parser->eof && parser->raw_unread < 2) {
if (!yaml_parser_update_raw_buffer(parser)) {
return 0;
}
}
/* Determine the encoding. */
if (parser->raw_unread >= 2 && IS_UTF16BE_BOM(parser->raw_pointer)) {
parser->encoding = YAML_UTF16BE_ENCODING;
}
else if (parser->raw_unread >= 2 && IS_UTF16LE_BOM(parser->raw_pointer)) {
parser->encoding = YAML_UTF16LE_ENCODING;
}
else {
parser->encoding = YAML_UTF8_ENCODING;
}
}
/*
* Update the raw buffer.
*/
int
yaml_parser_update_raw_buffer(yaml_parser_t *parser)
{
size_t size_read = 0;
/* Return if the raw buffer is full. */
if (parser->raw_unread == YAML_RAW_BUFFER_SIZE) return 1;
/* Return on EOF. */
if (parser->eof) return 1;
/* Move the remaining bytes in the raw buffer to the beginning. */
if (parser->raw_unread && parser->raw_buffer < parser->raw_pointer) {
memmove(parser->raw_buffer, parser->raw_pointer, parser->raw_unread);
}
parser->raw_pointer = parser->raw_buffer;
/* Call the read handler to fill the buffer. */
if (!parser->read_handler(parser->read_handler_data,
parser->raw_buffer + parser->raw_unread,
YAML_RAW_BUFFER_SIZE - parser->raw_unread,
&size_read)) {
parser->error = YAML_READER_ERROR;
return 0;
}
parser->raw_unread += size_read;
if (!size_read) {
parser->eof = 1;
}
return 1;
}
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