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-rw-r--r--src/pugixml.cpp91
1 files changed, 82 insertions, 9 deletions
diff --git a/src/pugixml.cpp b/src/pugixml.cpp
index fc48701..c92e66e 100644
--- a/src/pugixml.cpp
+++ b/src/pugixml.cpp
@@ -1895,8 +1895,67 @@ PUGI__NS_BEGIN
return is_little_endian() ? encoding_utf32_le : encoding_utf32_be;
}
- PUGI__FN xml_encoding guess_buffer_encoding(uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
+ PUGI__FN bool parse_declaration_encoding(const uint8_t* data, size_t size, const uint8_t** out_encoding, size_t* out_length)
{
+ #define PUGI__SCANCHAR(ch) { if (offset >= size || data[offset] != ch) return false; offset++; }
+ #define PUGI__SCANCHARTYPE(ct) { while (offset < size && PUGI__IS_CHARTYPE(data[offset], ct)) offset++; }
+
+ // check if we have a non-empty XML declaration
+ if (size < 6 || !((data[0] == '<') & (data[1] == '?') & (data[2] == 'x') & (data[3] == 'm') & (data[4] == 'l') && PUGI__IS_CHARTYPE(data[5], ct_space)))
+ return false;
+
+ // scan XML declaration until the encoding field
+ for (size_t i = 6; i + 1 < size; ++i)
+ {
+ // declaration can not contain ? in quoted values
+ if (data[i] == '?')
+ return false;
+
+ if (data[i] == 'e' && data[i + 1] == 'n')
+ {
+ size_t offset = i;
+
+ // encoding follows the version field which can't contain 'en' so this has to be the encoding if XML is well formed
+ PUGI__SCANCHAR('e'); PUGI__SCANCHAR('n'); PUGI__SCANCHAR('c'); PUGI__SCANCHAR('o');
+ PUGI__SCANCHAR('d'); PUGI__SCANCHAR('i'); PUGI__SCANCHAR('n'); PUGI__SCANCHAR('g');
+
+ // S? = S?
+ PUGI__SCANCHARTYPE(ct_space);
+ PUGI__SCANCHAR('=');
+ PUGI__SCANCHARTYPE(ct_space);
+
+ // the only two valid delimiters are ' and "
+ uint8_t delimiter = (offset < size && data[offset] == '"') ? '"' : '\'';
+
+ PUGI__SCANCHAR(delimiter);
+
+ size_t start = offset;
+
+ *out_encoding = data + offset;
+
+ PUGI__SCANCHARTYPE(ct_symbol);
+
+ *out_length = offset - start;
+
+ PUGI__SCANCHAR(delimiter);
+
+ return true;
+ }
+ }
+
+ return false;
+
+ #undef PUGI__SCANCHAR
+ #undef PUGI__SCANCHARTYPE
+ }
+
+ PUGI__FN xml_encoding guess_buffer_encoding(const uint8_t* data, size_t size)
+ {
+ // skip encoding autodetection if input buffer is too small
+ if (size < 4) return encoding_utf8;
+
+ uint8_t d0 = data[0], d1 = data[1], d2 = data[2], d3 = data[3];
+
// look for BOM in first few bytes
if (d0 == 0 && d1 == 0 && d2 == 0xfe && d3 == 0xff) return encoding_utf32_be;
if (d0 == 0xff && d1 == 0xfe && d2 == 0 && d3 == 0) return encoding_utf32_le;
@@ -1909,13 +1968,32 @@ PUGI__NS_BEGIN
if (d0 == 0x3c && d1 == 0 && d2 == 0 && d3 == 0) return encoding_utf32_le;
if (d0 == 0 && d1 == 0x3c && d2 == 0 && d3 == 0x3f) return encoding_utf16_be;
if (d0 == 0x3c && d1 == 0 && d2 == 0x3f && d3 == 0) return encoding_utf16_le;
- if (d0 == 0x3c && d1 == 0x3f && d2 == 0x78 && d3 == 0x6d) return encoding_utf8;
// look for utf16 < followed by node name (this may fail, but is better than utf8 since it's zero terminated so early)
if (d0 == 0 && d1 == 0x3c) return encoding_utf16_be;
if (d0 == 0x3c && d1 == 0) return encoding_utf16_le;
- // no known BOM detected, assume utf8
+ // no known BOM detected; parse declaration
+ const uint8_t* enc = 0;
+ size_t enc_length = 0;
+
+ if (d0 == 0x3c && d1 == 0x3f && d2 == 0x78 && d3 == 0x6d && parse_declaration_encoding(data, size, &enc, &enc_length))
+ {
+ // iso-8859-1 (case-insensitive)
+ if (enc_length == 10
+ && (enc[0] | ' ') == 'i' && (enc[1] | ' ') == 's' && (enc[2] | ' ') == 'o'
+ && enc[3] == '-' && enc[4] == '8' && enc[5] == '8' && enc[6] == '5' && enc[7] == '9'
+ && enc[8] == '-' && enc[9] == '1')
+ return encoding_latin1;
+
+ // latin1 (case-insensitive)
+ if (enc_length == 6
+ && (enc[0] | ' ') == 'l' && (enc[1] | ' ') == 'a' && (enc[2] | ' ') == 't'
+ && (enc[3] | ' ') == 'i' && (enc[4] | ' ') == 'n'
+ && enc[5] == '1')
+ return encoding_latin1;
+ }
+
return encoding_utf8;
}
@@ -1933,15 +2011,10 @@ PUGI__NS_BEGIN
// only do autodetection if no explicit encoding is requested
if (encoding != encoding_auto) return encoding;
- // skip encoding autodetection if input buffer is too small
- if (size < 4) return encoding_utf8;
-
// try to guess encoding (based on XML specification, Appendix F.1)
const uint8_t* data = static_cast<const uint8_t*>(contents);
- PUGI__DMC_VOLATILE uint8_t d0 = data[0], d1 = data[1], d2 = data[2], d3 = data[3];
-
- return guess_buffer_encoding(d0, d1, d2, d3);
+ return guess_buffer_encoding(data, size);
}
PUGI__FN bool get_mutable_buffer(char_t*& out_buffer, size_t& out_length, const void* contents, size_t size, bool is_mutable)