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// Copyright 2016 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.
#include <stdint.h>
#include <limits>
#include <memory>
#include "core/fxcodec/codec/ccodec_basicmodule.h"
#include "core/fxcodec/fx_codec.h"
#include "testing/gtest/include/gtest/gtest.h"
TEST(fxcodec, A85TestBadInputs) {
const uint8_t src_buf[] = {1, 2, 3, 4};
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
// Error codes, not segvs, should callers pass us a nullptr pointer.
EXPECT_FALSE(pEncoders->A85Encode(src_buf, &dest_buf, nullptr));
EXPECT_FALSE(pEncoders->A85Encode(src_buf, nullptr, &dest_size));
EXPECT_FALSE(pEncoders->A85Encode({}, &dest_buf, &dest_size));
}
// No leftover bytes, just translate 2 sets of symbols.
TEST(fxcodec, A85TestBasic) {
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
// Make sure really big values don't break.
const uint8_t src_buf[] = {1, 2, 3, 4, 255, 255, 255, 255};
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
EXPECT_TRUE(pEncoders->A85Encode(src_buf, &dest_buf, &dest_size));
// Should have 5 chars for each set of 4 and 2 terminators.
const uint8_t expected_out[] = {33, 60, 78, 63, 43, 115,
56, 87, 45, 33, 126, 62};
ASSERT_EQ(FX_ArraySize(expected_out), dest_size);
// Check the output
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
for (uint32_t i = 0; i < dest_size; i++)
EXPECT_EQ(expected_out[i], dest_buf_span[i]) << " at " << i;
}
// Leftover bytes.
TEST(fxcodec, A85TestLeftoverBytes) {
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
{
// 1 Leftover Byte:
const uint8_t src_buf_1leftover[] = {1, 2, 3, 4, 255};
EXPECT_TRUE(pEncoders->A85Encode(src_buf_1leftover, &dest_buf, &dest_size));
// 5 chars for first symbol + 2 + 2 terminators.
uint8_t expected_out_1leftover[] = {33, 60, 78, 63, 43, 114, 114, 126, 62};
ASSERT_EQ(FX_ArraySize(expected_out_1leftover), dest_size);
// Check the output
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
for (uint32_t i = 0; i < dest_size; i++)
EXPECT_EQ(expected_out_1leftover[i], dest_buf_span[i]) << " at " << i;
}
{
// 2 Leftover bytes:
const uint8_t src_buf_2leftover[] = {1, 2, 3, 4, 255, 254};
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->A85Encode(src_buf_2leftover, &dest_buf, &dest_size));
// 5 chars for first symbol + 3 + 2 terminators.
const uint8_t expected_out_2leftover[] = {33, 60, 78, 63, 43,
115, 56, 68, 126, 62};
ASSERT_EQ(FX_ArraySize(expected_out_2leftover), dest_size);
// Check the output
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
for (uint32_t i = 0; i < dest_size; i++)
EXPECT_EQ(expected_out_2leftover[i], dest_buf_span[i]) << " at " << i;
}
{
// 3 Leftover bytes:
const uint8_t src_buf_3leftover[] = {1, 2, 3, 4, 255, 254, 253};
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->A85Encode(src_buf_3leftover, &dest_buf, &dest_size));
// 5 chars for first symbol + 4 + 2 terminators.
const uint8_t expected_out_3leftover[] = {33, 60, 78, 63, 43, 115,
56, 77, 114, 126, 62};
ASSERT_EQ(FX_ArraySize(expected_out_3leftover), dest_size);
// Check the output
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
for (uint32_t i = 0; i < dest_size; i++)
EXPECT_EQ(expected_out_3leftover[i], dest_buf_span[i]) << " at " << i;
}
}
// Test all zeros comes through as "z".
TEST(fxcodec, A85TestZeros) {
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
{
// Make sure really big values don't break.
const uint8_t src_buf[] = {1, 2, 3, 4, 0, 0, 0, 0};
EXPECT_TRUE(pEncoders->A85Encode(src_buf, &dest_buf, &dest_size));
// Should have 5 chars for first set of 4 + 1 for z + 2 terminators.
const uint8_t expected_out[] = {33, 60, 78, 63, 43, 122, 126, 62};
ASSERT_EQ(FX_ArraySize(expected_out), dest_size);
// Check the output
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
for (uint32_t i = 0; i < dest_size; i++)
EXPECT_EQ(expected_out[i], dest_buf_span[i]) << " at " << i;
}
{
// Should also work if it is at the start:
const uint8_t src_buf_2[] = {0, 0, 0, 0, 1, 2, 3, 4};
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->A85Encode(src_buf_2, &dest_buf, &dest_size));
// Should have 5 chars for set of 4 + 1 for z + 2 terminators.
const uint8_t expected_out_2[] = {122, 33, 60, 78, 63, 43, 126, 62};
ASSERT_EQ(FX_ArraySize(expected_out_2), dest_size);
// Check the output
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
for (uint32_t i = 0; i < dest_size; i++)
EXPECT_EQ(expected_out_2[i], dest_buf_span[i]) << " at " << i;
}
{
// Try with 2 leftover zero bytes. Make sure we don't get a "z".
const uint8_t src_buf_3[] = {1, 2, 3, 4, 0, 0};
dest_buf.reset();
dest_size = 0;
EXPECT_TRUE(pEncoders->A85Encode(src_buf_3, &dest_buf, &dest_size));
// Should have 5 chars for set of 4 + 3 for last 2 + 2 terminators.
const uint8_t expected_out_leftover[] = {33, 60, 78, 63, 43,
33, 33, 33, 126, 62};
ASSERT_EQ(FX_ArraySize(expected_out_leftover), dest_size);
// Check the output
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
for (uint32_t i = 0; i < dest_size; i++)
EXPECT_EQ(expected_out_leftover[i], dest_buf_span[i]) << " at " << i;
}
}
// Make sure we get returns in the expected locations.
TEST(fxcodec, A85TestLineBreaks) {
// Make sure really big values don't break.
uint8_t src_buf[131] = {0};
// 1 full line + most of a line of normal symbols.
for (int k = 0; k < 116; k += 4) {
src_buf[k] = 1;
src_buf[k + 1] = 2;
src_buf[k + 2] = 3;
src_buf[k + 3] = 4;
}
// Fill in the end, leaving an all zero gap + 3 extra zeros at the end.
for (int k = 120; k < 128; k++) {
src_buf[k] = 1;
src_buf[k + 1] = 2;
src_buf[k + 2] = 3;
src_buf[k + 3] = 4;
}
std::unique_ptr<uint8_t, FxFreeDeleter> dest_buf;
uint32_t dest_size = 0;
CCodec_BasicModule* pEncoders = CCodec_ModuleMgr().GetBasicModule();
EXPECT_TRUE(pEncoders);
// Should succeed.
EXPECT_TRUE(pEncoders->A85Encode(src_buf, &dest_buf, &dest_size));
// Should have 75 chars in the first row plus 2 char return,
// 76 chars in the second row plus 2 char return,
// and 9 chars in the last row with 2 terminators.
ASSERT_EQ(166u, dest_size);
// Check for the returns.
auto dest_buf_span = pdfium::make_span(dest_buf.get(), dest_size);
EXPECT_EQ(13, dest_buf_span[75]);
EXPECT_EQ(10, dest_buf_span[76]);
EXPECT_EQ(13, dest_buf_span[153]);
EXPECT_EQ(10, dest_buf_span[154]);
}
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