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-rw-r--r--core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp85
1 files changed, 41 insertions, 44 deletions
diff --git a/core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp b/core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
index 1b5bd024f8..eaf1e04193 100644
--- a/core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
+++ b/core/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
@@ -7,6 +7,8 @@
#include "core/fpdfapi/fpdf_parser/include/fpdf_parser_decode.h"
#include <limits.h>
+
+#include <algorithm>
#include <utility>
#include <vector>
@@ -18,7 +20,26 @@
#include "core/fxcrt/include/fx_ext.h"
#include "third_party/base/stl_util.h"
-#define _STREAM_MAX_SIZE_ 20 * 1024 * 1024
+namespace {
+
+const uint32_t kMaxStreamSize = 20 * 1024 * 1024;
+
+bool CheckFlateDecodeParams(int Colors, int BitsPerComponent, int Columns) {
+ if (Colors < 0 || BitsPerComponent < 0 || Columns < 0)
+ return false;
+
+ int check = Columns;
+ if (check > 0 && Colors > INT_MAX / check)
+ return false;
+
+ check *= Colors;
+ if (check > 0 && BitsPerComponent > INT_MAX / check)
+ return false;
+
+ return check * BitsPerComponent <= INT_MAX - 7;
+}
+
+} // namespace
const uint16_t PDFDocEncoding[256] = {
0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008,
@@ -171,31 +192,34 @@ uint32_t RunLengthDecode(const uint8_t* src_buf,
uint8_t*& dest_buf,
uint32_t& dest_size) {
uint32_t i = 0;
- uint32_t old;
dest_size = 0;
while (i < src_size) {
+ if (src_buf[i] == 128)
+ break;
+
+ uint32_t old = dest_size;
if (src_buf[i] < 128) {
- old = dest_size;
dest_size += src_buf[i] + 1;
if (dest_size < old)
return FX_INVALID_OFFSET;
i += src_buf[i] + 2;
- } else if (src_buf[i] > 128) {
- old = dest_size;
+ } else {
dest_size += 257 - src_buf[i];
if (dest_size < old)
return FX_INVALID_OFFSET;
i += 2;
- } else {
- break;
}
}
- if (dest_size >= _STREAM_MAX_SIZE_)
+ if (dest_size >= kMaxStreamSize)
return FX_INVALID_OFFSET;
+
dest_buf = FX_Alloc(uint8_t, dest_size);
i = 0;
int dest_count = 0;
while (i < src_size) {
+ if (src_buf[i] == 128)
+ break;
+
if (src_buf[i] < 128) {
uint32_t copy_len = src_buf[i] + 1;
uint32_t buf_left = src_size - i - 1;
@@ -207,7 +231,7 @@ uint32_t RunLengthDecode(const uint8_t* src_buf,
FXSYS_memcpy(dest_buf + dest_count, src_buf + i + 1, copy_len);
dest_count += src_buf[i] + 1;
i += src_buf[i] + 2;
- } else if (src_buf[i] > 128) {
+ } else {
int fill = 0;
if (i < src_size - 1) {
fill = src_buf[i + 1];
@@ -215,15 +239,10 @@ uint32_t RunLengthDecode(const uint8_t* src_buf,
FXSYS_memset(dest_buf + dest_count, fill, 257 - src_buf[i]);
dest_count += 257 - src_buf[i];
i += 2;
- } else {
- break;
}
}
- uint32_t ret = i + 1;
- if (ret > src_size) {
- ret = src_size;
- }
- return ret;
+
+ return std::min(i + 1, src_size);
}
CCodec_ScanlineDecoder* FPDFAPI_CreateFaxDecoder(
@@ -233,16 +252,16 @@ CCodec_ScanlineDecoder* FPDFAPI_CreateFaxDecoder(
int height,
const CPDF_Dictionary* pParams) {
int K = 0;
- FX_BOOL EndOfLine = FALSE;
- FX_BOOL ByteAlign = FALSE;
- FX_BOOL BlackIs1 = FALSE;
+ bool EndOfLine = false;
+ bool ByteAlign = false;
+ bool BlackIs1 = false;
int Columns = 1728;
int Rows = 0;
if (pParams) {
K = pParams->GetIntegerFor("K");
- EndOfLine = pParams->GetIntegerFor("EndOfLine");
- ByteAlign = pParams->GetIntegerFor("EncodedByteAlign");
- BlackIs1 = pParams->GetIntegerFor("BlackIs1");
+ EndOfLine = !!pParams->GetIntegerFor("EndOfLine");
+ ByteAlign = !!pParams->GetIntegerFor("EncodedByteAlign");
+ BlackIs1 = !!pParams->GetIntegerFor("BlackIs1");
Columns = pParams->GetIntegerFor("Columns", 1728);
Rows = pParams->GetIntegerFor("Rows");
if (Rows > USHRT_MAX) {
@@ -254,28 +273,6 @@ CCodec_ScanlineDecoder* FPDFAPI_CreateFaxDecoder(
Columns, Rows);
}
-static FX_BOOL CheckFlateDecodeParams(int Colors,
- int BitsPerComponent,
- int Columns) {
- if (Columns < 0) {
- return FALSE;
- }
- int check = Columns;
- if (Colors < 0 || (check > 0 && Colors > INT_MAX / check)) {
- return FALSE;
- }
- check *= Colors;
- if (BitsPerComponent < 0 ||
- (check > 0 && BitsPerComponent > INT_MAX / check)) {
- return FALSE;
- }
- check *= BitsPerComponent;
- if (check > INT_MAX - 7) {
- return FALSE;
- }
- return TRUE;
-}
-
CCodec_ScanlineDecoder* FPDFAPI_CreateFlateDecoder(
const uint8_t* src_buf,
uint32_t src_size,