Add a test for the HexDecode method.

core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include <limits.h>
 #include "../../../include/fpdfapi/fpdf_parser.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fxcodec/fx_codec.h"
@@ skipping 24 matching lines @@
     0x00b4, 0x00b5, 0x00b6, 0x00b7, 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc,
     0x00bd, 0x00be, 0x00bf, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5,
     0x00c6, 0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
     0x00cf, 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
     0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df, 0x00e0,
     0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7, 0x00e8, 0x00e9,
     0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef, 0x00f0, 0x00f1, 0x00f2,
     0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7, 0x00f8, 0x00f9, 0x00fa, 0x00fb,
     0x00fc, 0x00fd, 0x00fe, 0x00ff};
 
-FX_DWORD _A85Decode(const uint8_t* src_buf,
-                    FX_DWORD src_size,
-                    uint8_t*& dest_buf,
-                    FX_DWORD& dest_size) {
+FX_DWORD A85Decode(const uint8_t* src_buf,
+                   FX_DWORD src_size,
+                   uint8_t*& dest_buf,
+                   FX_DWORD& dest_size) {
   dest_size = 0;
   dest_buf = NULL;
   if (src_size == 0) {
     return 0;
   }
   FX_DWORD zcount = 0;
   FX_DWORD pos = 0;
   while (pos < src_size) {
     uint8_t ch = src_buf[pos];
     if (ch < '!' && ch != '\n' && ch != '\r' && ch != ' ' && ch != '\t') {
@@ skipping 51 matching lines @@
     }
     for (i = 0; i < state - 1; i++) {
       dest_buf[dest_size++] = (uint8_t)(res >> (3 - i) * 8);
     }
   }
   if (pos < src_size && src_buf[pos] == '>') {
     pos++;
   }
   return pos;
 }
-FX_DWORD _HexDecode(const uint8_t* src_buf,
-                    FX_DWORD src_size,
-                    uint8_t*& dest_buf,
-                    FX_DWORD& dest_size) {
+FX_DWORD HexDecode(const uint8_t* src_buf,
+                   FX_DWORD src_size,
+                   uint8_t*& dest_buf,
+                   FX_DWORD& dest_size) {
   FX_DWORD i;
   for (i = 0; i < src_size; i++)
     if (src_buf[i] == '>') {
       break;
     }
   dest_buf = FX_Alloc(uint8_t, i / 2 + 1);
   dest_size = 0;
   FX_BOOL bFirstDigit = TRUE;
   for (i = 0; i < src_size; i++) {
     uint8_t ch = src_buf[i];
@@ skipping 239 matching lines @@
         pImageParms = pParam;
         return TRUE;
       }
       offset = FPDFAPI_FlateOrLZWDecode(FALSE, last_buf, last_size, pParam,
                                         estimated_size, new_buf, new_size);
     } else if (decoder == FX_BSTRC("LZWDecode") || decoder == FX_BSTRC("LZW")) {
       offset = FPDFAPI_FlateOrLZWDecode(TRUE, last_buf, last_size, pParam,
                                         estimated_size, new_buf, new_size);
     } else if (decoder == FX_BSTRC("ASCII85Decode") ||
                decoder == FX_BSTRC("A85")) {
-      offset = _A85Decode(last_buf, last_size, new_buf, new_size);
+      offset = A85Decode(last_buf, last_size, new_buf, new_size);
     } else if (decoder == FX_BSTRC("ASCIIHexDecode") ||
                decoder == FX_BSTRC("AHx")) {
-      offset = _HexDecode(last_buf, last_size, new_buf, new_size);
+      offset = HexDecode(last_buf, last_size, new_buf, new_size);
     } else if (decoder == FX_BSTRC("RunLengthDecode") ||
                decoder == FX_BSTRC("RL")) {
       if (bImageAcc && i == DecoderList.GetSize() - 1) {
         ImageEncoding = FX_BSTRC("RunLengthDecode");
         dest_buf = (uint8_t*)last_buf;
         dest_size = last_size;
         pImageParms = pParam;
         return TRUE;
       }
       offset = RunLengthDecode(last_buf, last_size, new_buf, new_size);
@@ skipping 176 matching lines @@
                      FX_DWORD src_size,
                      uint8_t*& dest_buf,
                      FX_DWORD& dest_size) {
   CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
   if (pEncoders) {
     return pEncoders->GetFlateModule()->FlateOrLZWDecode(
         FALSE, src_buf, src_size, FALSE, 0, 0, 0, 0, 0, dest_buf, dest_size);
   }
   return 0;
 }