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authorTom Sepez <tsepez@chromium.org>2018-04-12 18:33:55 +0000
committerChromium commit bot <commit-bot@chromium.org>2018-04-12 18:33:55 +0000
commit154e18f9a862975abecebe77b8f5fb418418d14c (patch)
tree18e9381c1a4324abcd98296e1e1714c2f926e006 /core/fpdfapi
parent7f821c11081fe90346823333622253ec7949b583 (diff)
downloadpdfium-154e18f9a862975abecebe77b8f5fb418418d14c.tar.xz
Return pdfium::span<wchar_t> from WideString::GetBuffer().
Adds bounds checking "for free", but beware of span outliving a ReleaseBuffer() call. Scoping as such avoids the possibility of using an invalid span (and it is flagged as a lifetime issue). Change-Id: Ica63f4b1429823d0254ec6951aeaeb08160cb93c Reviewed-on: https://pdfium-review.googlesource.com/30310 Reviewed-by: dsinclair <dsinclair@chromium.org> Commit-Queue: Tom Sepez <tsepez@chromium.org>
Diffstat (limited to 'core/fpdfapi')
-rw-r--r--core/fpdfapi/parser/fpdf_parser_decode.cpp11
1 files changed, 5 insertions, 6 deletions
diff --git a/core/fpdfapi/parser/fpdf_parser_decode.cpp b/core/fpdfapi/parser/fpdf_parser_decode.cpp
index d7114b66c5..90dca2edcb 100644
--- a/core/fpdfapi/parser/fpdf_parser_decode.cpp
+++ b/core/fpdfapi/parser/fpdf_parser_decode.cpp
@@ -425,6 +425,7 @@ bool PDF_DataDecode(const uint8_t* src_buf,
}
WideString PDF_DecodeText(const uint8_t* src_data, uint32_t src_len) {
+ int dest_pos = 0;
WideString result;
if (src_len >= 2 && ((src_data[0] == 0xfe && src_data[1] == 0xff) ||
(src_data[0] == 0xff && src_data[1] == 0xfe))) {
@@ -432,17 +433,15 @@ WideString PDF_DecodeText(const uint8_t* src_data, uint32_t src_len) {
if (!max_chars)
return result;
+ pdfium::span<wchar_t> dest_buf = result.GetBuffer(max_chars);
bool bBE = src_data[0] == 0xfe || (src_data[0] == 0xff && !src_data[2]);
- wchar_t* dest_buf = result.GetBuffer(max_chars);
const uint8_t* uni_str = src_data + 2;
- int dest_pos = 0;
for (uint32_t i = 0; i < max_chars * 2; i += 2) {
uint16_t unicode = GetUnicodeFromBytes(uni_str + i, bBE);
if (unicode != 0x1b) {
dest_buf[dest_pos++] = unicode;
continue;
}
-
i += 2;
while (i < max_chars * 2) {
uint16_t unicode2 = GetUnicodeFromBytes(uni_str + i, bBE);
@@ -451,13 +450,13 @@ WideString PDF_DecodeText(const uint8_t* src_data, uint32_t src_len) {
break;
}
}
- result.ReleaseBuffer(dest_pos);
} else {
- wchar_t* dest_buf = result.GetBuffer(src_len);
+ pdfium::span<wchar_t> dest_buf = result.GetBuffer(src_len);
for (uint32_t i = 0; i < src_len; ++i)
dest_buf[i] = PDFDocEncoding[src_data[i]];
- result.ReleaseBuffer(src_len);
+ dest_pos = src_len;
}
+ result.ReleaseBuffer(dest_pos);
return result;
}