#if HAVE_CONFIG_H #include #endif #include #include /* * Set the reader error and return 0. */ int yaml_parser_set_reader_error(yaml_parser_t *parser, const char *problem, size_t offset, int value) { parser->error = YAML_READER_ERROR; parser->problem = problem; parser->problem_offset = offset; parser->problem_value = value; return 0; } /* * 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 and the raw buffer is empty, do nothing. */ if (parser->eof && !parser->raw_unread) 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 value, value2; int incomplete = 0; unsigned char octet; unsigned int width; int k, low, high; /* Decode the next character. */ switch (parser->encoding) { case YAML_UTF8_ENCODING: /* * Decode a UTF-8 character. Check RFC 3629 * (http://www.ietf.org/rfc/rfc3629.txt) for more details. * * The following table (taken from the RFC) is used for * decoding. * * 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 * * Additionally, the characters in the range 0xD800-0xDFFF * are prohibited as they are reserved for use with UTF-16 * surrogate pairs. */ /* Determine the length of the UTF-8 sequence. */ octet = parser->raw_pointer[0]; width = (octet & 0x80) == 0x00 ? 1 : (octet & 0xE0) == 0xC0 ? 2 : (octet & 0xF0) == 0xE0 ? 3 : (octet & 0xF8) == 0xF0 ? 4 : 0; /* Check if the leading octet is valid. */ if (!width) return yaml_parser_set_reader_error(parser, "Invalid leading UTF-8 octet", parser->offset, octet); /* Check if the raw buffer contains an incomplete character. */ if (width > parser->raw_unread) { if (parser->eof) { return yaml_parser_set_reader_error(parser, "Incomplete UTF-8 octet sequence", parser->offset, -1); } incomplete = 1; break; } /* Decode the leading octet. */ value = (octet & 0x80) == 0x00 ? octet & 0x7F : (octet & 0xE0) == 0xC0 ? octet & 0x1F : (octet & 0xF0) == 0xE0 ? octet & 0x0F : (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0; /* Check and decode the trailing octets. */ for (k = 1; k < width; k ++) { octet = parser->raw_pointer[k]; /* Check if the octet is valid. */ if ((octet & 0xC0) != 0x80) return yaml_parser_set_reader_error(parser, "Invalid trailing UTF-8 octet", parser->offset+k, octet); /* Decode the octet. */ value = (value << 6) + (octet & 0x3F); } /* Check the length of the sequence against the value. */ if (!((width == 1) || (width == 2 && value >= 0x80) || (width == 3 && value >= 0x800) || (width == 4 && value >= 0x10000))) return yaml_parser_set_reader_error(parser, "Invalid length of a UTF-8 sequence", parser->offset, -1); /* Check the range of the value. */ if ((value >= 0xD800 && value <= 0xDFFF) || value > 0x10FFFF) return yaml_parser_set_reader_error(parser, "Invalid Unicode character", parser->offset, value); break; case YAML_UTF16LE_ENCODING: case YAML_UTF16BE_ENCODING: low = (parser->encoding == YAML_UTF16LE_ENCODING ? 0 : 1); high = (parser->encoding == YAML_UTF16LE_ENCODING ? 1 : 0); /* * The UTF-16 encoding is not as simple as one might * naively think. Check RFC 2781 * (http://www.ietf.org/rfc/rfc2781.txt). * * Normally, two subsequent bytes describe a Unicode * character. However a special technique (called a * surrogate pair) is used for specifying character * values larger than 0xFFFF. * * A surrogate pair consists of two pseudo-characters: * high surrogate area (0xD800-0xDBFF) * low surrogate area (0xDC00-0xDFFF) * * The following formulas are used for decoding * and encoding characters using surrogate pairs: * * U = U' + 0x10000 (0x01 00 00 <= U <= 0x10 FF FF) * U' = yyyyyyyyyyxxxxxxxxxx (0 <= U' <= 0x0F FF FF) * W1 = 110110yyyyyyyyyy * W2 = 110111xxxxxxxxxx * * where U is the character value, W1 is the high surrogate * area, W2 is the low surrogate area. */ /* Check for incomplete UTF-16 character. */ if (parser->raw_unread < 2) { if (parser->eof) { return yaml_parser_set_reader_error(parser, "Incomplete UTF-16 character", parser->offset, -1); } incomplete = 1; break; } /* Get the character. */ value = parser->raw_pointer[low] + (parser->raw_pointer[high] << 8); /* Check for unexpected low surrogate area. */ if ((value & 0xFC00) == 0xDC00) return yaml_parser_set_reader_error(parser, "Unexpected low surrogate area", parser->offset, value); /* Check for a high surrogate area. */ if ((value & 0xFC00) == 0xD800) { width = 4; /* Check for incomplete surrogate pair. */ if (parser->raw_unread < 4) { if (parser->eof) { return yaml_parser_set_reader_error(parser, "Incomplete UTF-16 surrogate pair", parser->offset, -1); } incomplete = 1; break; } /* Get the next character. */ unsigned int value2 = parser->raw_pointer[low+2] + (parser->raw_pointer[high+2] << 8); /* Check for a low surrogate area. */ if ((value2 & 0xFC00) != 0xDC00) return yaml_parser_set_reader_error(parser, "Expected low surrogate area", parser->offset+2, value2); /* Generate the value of the surrogate pair. */ value = 0x10000 + ((value & 0x3FF) << 10) + (value2 & 0x3FF); } else { width = 2; } break; } /* Check if the raw buffer contains enough bytes to form a character. */ if (incomplete) 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 (! (value == 0x09 || value == 0x0A || value == 0x0D || (value >= 0x20 && value <= 0x7E) || (value == 0x85) || (value >= 0xA0 && value <= 0xD7FF) || (value >= 0xE000 && value <= 0xFFFD) || (value >= 0x10000 && value <= 0x10FFFF))) return yaml_parser_set_reader_error(parser, "Control characters are not allowed", parser->offset, value); /* Move the raw pointers. */ parser->raw_pointer += width; parser->raw_unread -= width; parser->offset += width; /* Finally put the character into the buffer. */ /* 0000 0000-0000 007F -> 0xxxxxxx */ if (value <= 0x7F) { *(parser->buffer_end++) = value; } /* 0000 0080-0000 07FF -> 110xxxxx 10xxxxxx */ else if (value <= 0x7FF) { *(parser->buffer_end++) = 0xC0 + (value >> 6); *(parser->buffer_end++) = 0x80 + (value & 0x3F); } /* 0000 0800-0000 FFFF -> 1110xxxx 10xxxxxx 10xxxxxx */ else if (value <= 0xFFFF) { *(parser->buffer_end++) = 0xE0 + (value >> 12); *(parser->buffer_end++) = 0x80 + ((value >> 6) & 0x3F); *(parser->buffer_end++) = 0x80 + (value & 0x3F); } /* 0001 0000-0010 FFFF -> 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */ else { *(parser->buffer_end++) = 0xF0 + (value >> 18); *(parser->buffer_end++) = 0x80 + ((value >> 12) & 0x3F); *(parser->buffer_end++) = 0x80 + ((value >> 6) & 0x3F); *(parser->buffer_end++) = 0x80 + (value & 0x3F); } parser->unread ++; } /* On EOF, put NUL into the buffer and return. */ if (parser->eof) { *(parser->buffer_end++) = '\0'; parser->unread ++; return 1; } } return 1; } /* * 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. */ #define BOM_UTF8 "\xef\xbb\xbf" #define BOM_UTF16LE "\xff\xfe" #define BOM_UTF16BE "\xfe\xff" 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 < 3) { if (!yaml_parser_update_raw_buffer(parser)) { return 0; } } /* Determine the encoding. */ if (parser->raw_unread >= 2 && !memcmp(parser->raw_pointer, BOM_UTF16LE, 2)) { parser->encoding = YAML_UTF16LE_ENCODING; parser->raw_pointer += 2; parser->raw_unread -= 2; parser->offset += 2; } else if (parser->raw_unread >= 2 && !memcmp(parser->raw_pointer, BOM_UTF16BE, 2)) { parser->encoding = YAML_UTF16BE_ENCODING; parser->raw_pointer += 2; parser->raw_unread -= 2; parser->offset += 2; } else if (parser->raw_unread >= 3 && !memcmp(parser->raw_pointer, BOM_UTF8, 3)) { parser->encoding = YAML_UTF8_ENCODING; parser->raw_pointer += 3; parser->raw_unread -= 3; parser->offset += 3; } else { parser->encoding = YAML_UTF8_ENCODING; } return 1; } /* * 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)) { return yaml_parser_set_reader_error(parser, "Input error", parser->offset, -1); } parser->raw_unread += size_read; if (!size_read) { parser->eof = 1; } return 1; }