#if HAVE_CONFIG_H #include #endif #include #include /* 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; }