diff options
Diffstat (limited to 'core/src/fxcodec/codec')
| -rw-r--r-- | core/src/fxcodec/codec/codec_int.h | 25 | ||||
| -rw-r--r-- | core/src/fxcodec/codec/fx_codec_jpx_opj.cpp | 90 | ||||
| -rw-r--r-- | core/src/fxcodec/codec/fx_codec_jpx_unittest.cpp | 470 |
3 files changed, 554 insertions, 31 deletions
diff --git a/core/src/fxcodec/codec/codec_int.h b/core/src/fxcodec/codec/codec_int.h index b95871b4e1..d79f7ceaf1 100644 --- a/core/src/fxcodec/codec/codec_int.h +++ b/core/src/fxcodec/codec/codec_int.h @@ -4,9 +4,16 @@ // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com +#ifndef CORE_SRC_FXCODEC_CODEC_CODEC_INT_H_ +#define CORE_SRC_FXCODEC_CODEC_CODEC_INT_H_ + #include <limits.h> #include <list> + +#include "../../../include/fxcodec/fx_codec.h" #include "../jbig2/JBig2_Context.h" +#include "../fx_libopenjpeg/libopenjpeg20/openjpeg.h" // For OPJ_SIZE_T. + class CCodec_BasicModule : public ICodec_BasicModule { public: @@ -272,3 +279,21 @@ public: std::list<CJBig2_CachePair> m_SymbolDictCache; private: }; + +struct DecodeData { +public: + DecodeData(unsigned char* src_data, OPJ_SIZE_T src_size) : + src_data(src_data), src_size(src_size), offset(0) { + } + unsigned char* src_data; + OPJ_SIZE_T src_size; + OPJ_SIZE_T offset; +}; + +/* Wrappers for C-style callbacks. */ +OPJ_SIZE_T opj_read_from_memory (void* p_buffer, OPJ_SIZE_T nb_bytes, void* p_user_data); +OPJ_SIZE_T opj_write_from_memory (void* p_buffer, OPJ_SIZE_T nb_bytes, void* p_user_data); +OPJ_OFF_T opj_skip_from_memory (OPJ_OFF_T nb_bytes, void* p_user_data); +OPJ_BOOL opj_seek_from_memory (OPJ_OFF_T nb_bytes, void* p_user_data); + +#endif // CORE_SRC_FXCODEC_CODEC_CODEC_INT_H_ diff --git a/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp b/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp index 164fd3e715..0ba6830944 100644 --- a/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp +++ b/core/src/fxcodec/codec/fx_codec_jpx_opj.cpp @@ -4,10 +4,13 @@ // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com +#include <limits> + #include "../../../include/fxcodec/fx_codec.h" #include "codec_int.h" #include "../fx_libopenjpeg/libopenjpeg20/openjpeg.h" #include "../lcms2/include/fx_lcms2.h" + static void fx_error_callback(const char *msg, void *client_data) { (void)client_data; @@ -20,63 +23,91 @@ static void fx_info_callback(const char *msg, void *client_data) { (void)client_data; } -struct DecodeData { - unsigned char* src_data; - OPJ_SIZE_T src_size; - OPJ_SIZE_T offset; -}; -static OPJ_SIZE_T opj_read_from_memory (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void* p_user_data) +OPJ_SIZE_T opj_read_from_memory(void* p_buffer, OPJ_SIZE_T nb_bytes, void* p_user_data) { DecodeData* srcData = static_cast<DecodeData*>(p_user_data); - if (srcData == NULL || srcData->src_size == 0 || srcData->src_data == NULL || srcData->offset >= srcData->src_size) { + if (!srcData || !srcData->src_data || srcData->src_size == 0) { + return -1; + } + // Reads at EOF return an error code. + if (srcData->offset >= srcData->src_size) { return -1; } OPJ_SIZE_T bufferLength = srcData->src_size - srcData->offset; - OPJ_SIZE_T readlength = p_nb_bytes < bufferLength ? p_nb_bytes : bufferLength; + OPJ_SIZE_T readlength = nb_bytes < bufferLength ? nb_bytes : bufferLength; memcpy(p_buffer, &srcData->src_data[srcData->offset], readlength); srcData->offset += readlength; return readlength; } -static OPJ_SIZE_T opj_write_from_memory (void * p_buffer, OPJ_SIZE_T p_nb_bytes, void* p_user_data) +OPJ_SIZE_T opj_write_from_memory(void* p_buffer, OPJ_SIZE_T nb_bytes, void* p_user_data) { DecodeData* srcData = static_cast<DecodeData*>(p_user_data); - if (srcData == NULL || srcData->src_size == 0 || srcData->src_data == NULL || srcData->offset >= srcData->src_size) { + if (!srcData || !srcData->src_data || srcData->src_size == 0) { + return -1; + } + // Writes at EOF return an error code. + if (srcData->offset >= srcData->src_size) { return -1; } OPJ_SIZE_T bufferLength = srcData->src_size - srcData->offset; - OPJ_SIZE_T writeLength = p_nb_bytes < bufferLength ? p_nb_bytes : bufferLength; + OPJ_SIZE_T writeLength = nb_bytes < bufferLength ? nb_bytes : bufferLength; memcpy(&srcData->src_data[srcData->offset], p_buffer, writeLength); srcData->offset += writeLength; return writeLength; } -static OPJ_OFF_T opj_skip_from_memory (OPJ_OFF_T p_nb_bytes, void* p_user_data) +OPJ_OFF_T opj_skip_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data) { DecodeData* srcData = static_cast<DecodeData*>(p_user_data); - if (srcData == NULL || srcData->src_size == 0 || srcData->src_data == NULL) { + if (!srcData || !srcData->src_data || srcData->src_size == 0) { return -1; } - if (srcData->offset >= srcData->src_size) { - srcData->offset = srcData->src_size; - return p_nb_bytes; + // Offsets are signed and may indicate a negative skip. Do not support this + // because of the strange return convention where either bytes skipped or + // -1 is returned. Following that convention, a successful relative seek of + // -1 bytes would be required to to give the same result as the error case. + if (nb_bytes < 0) { + return -1; } - OPJ_SIZE_T bufferLength = srcData->src_size - srcData->offset; - OPJ_SIZE_T skipLength = p_nb_bytes < bufferLength ? p_nb_bytes : bufferLength; - srcData->offset += skipLength; - return skipLength; + // FIXME: use std::make_unsigned<OPJ_OFF_T>::type once c++11 lib is OK'd. + uint64_t unsignedNbBytes = static_cast<uint64_t>(nb_bytes); + // Additionally, the offset may take us beyond the range of a size_t (e.g. + // 32-bit platforms). If so, just clamp at EOF. + if (unsignedNbBytes > std::numeric_limits<OPJ_SIZE_T>::max() - srcData->offset) { + srcData->offset = srcData->src_size; + } else { + OPJ_SIZE_T checkedNbBytes = static_cast<OPJ_SIZE_T>(unsignedNbBytes); + // Otherwise, mimic fseek() semantics to always succeed, even past EOF, + // clamping at EOF. We can get away with this since we don't actually + // provide negative relative skips from beyond EOF back to inside the + // data, which would be the only reason to need to know exactly how far + // beyond EOF we are. + srcData->offset = std::min(srcData->offset + checkedNbBytes, srcData->src_size); + } + return nb_bytes; } -static OPJ_BOOL opj_seek_from_memory (OPJ_OFF_T p_nb_bytes, void* p_user_data) +OPJ_BOOL opj_seek_from_memory(OPJ_OFF_T nb_bytes, void* p_user_data) { DecodeData* srcData = static_cast<DecodeData*>(p_user_data); - if (srcData == NULL || srcData->src_size == 0 || srcData->src_data == NULL) { + if (!srcData || !srcData->src_data || srcData->src_size == 0) { return OPJ_FALSE; } - if (srcData->offset >= srcData->src_size) { - return OPJ_TRUE; - } - if (p_nb_bytes >= srcData->src_size) { + // Offsets are signed and may indicate a negative position, which would + // be before the start of the file. Do not support this. + if (nb_bytes < 0) { return OPJ_FALSE; } - srcData->offset = p_nb_bytes; + // FIXME: use std::make_unsigned<OPJ_OFF_T>::type once c++11 lib is OK'd. + uint64_t unsignedNbBytes = static_cast<uint64_t>(nb_bytes); + // Additionally, the offset may take us beyond the range of a size_t (e.g. + // 32-bit platforms). If so, just clamp at EOF. + if (unsignedNbBytes > std::numeric_limits<OPJ_SIZE_T>::max()) { + srcData->offset = srcData->src_size; + } else { + OPJ_SIZE_T checkedNbBytes = static_cast<OPJ_SIZE_T>(nb_bytes); + // Otherwise, mimic fseek() semantics to always succeed, even past EOF, + // again clamping at EOF. + srcData->offset = std::min(checkedNbBytes, srcData->src_size); + } return OPJ_TRUE; } opj_stream_t* fx_opj_stream_create_memory_stream (DecodeData* data, OPJ_SIZE_T p_size, OPJ_BOOL p_is_read_stream) @@ -591,10 +622,7 @@ FX_BOOL CJPX_Decoder::Init(const unsigned char* src_data, int src_size) image = NULL; m_SrcData = src_data; m_SrcSize = src_size; - DecodeData srcData; - srcData.offset = 0; - srcData.src_size = src_size; - srcData.src_data = const_cast<unsigned char*>(src_data); + DecodeData srcData(const_cast<unsigned char*>(src_data), src_size); l_stream = fx_opj_stream_create_memory_stream(&srcData, OPJ_J2K_STREAM_CHUNK_SIZE, 1); if (l_stream == NULL) { return FALSE; diff --git a/core/src/fxcodec/codec/fx_codec_jpx_unittest.cpp b/core/src/fxcodec/codec/fx_codec_jpx_unittest.cpp new file mode 100644 index 0000000000..f867788759 --- /dev/null +++ b/core/src/fxcodec/codec/fx_codec_jpx_unittest.cpp @@ -0,0 +1,470 @@ +// 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. + +#include <stdint.h> + +#include <limits> + +#include "codec_int.h" +#include "testing/gtest/include/gtest/gtest.h" +#include "../../../testing/fx_string_testhelpers.h" + +static const OPJ_OFF_T kSkipError = static_cast<OPJ_OFF_T>(-1); +static const OPJ_SIZE_T kReadError = static_cast<OPJ_SIZE_T>(-1); +static const OPJ_SIZE_T kWriteError = static_cast<OPJ_SIZE_T>(-1); + +static unsigned char stream_data[] = { + 0x00, 0x01, 0x02, 0x03, + 0x84, 0x85, 0x86, 0x87, // Include some hi-bytes, too. +}; + +TEST(fxcodec, DecodeDataNullDecodeData) { + unsigned char buffer[16]; + DecodeData* ptr = nullptr; + + // Error codes, not segvs, should callers pass us a NULL pointer. + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, sizeof(buffer), ptr)); + EXPECT_EQ(kWriteError, opj_write_from_memory(buffer, sizeof(buffer), ptr)); + EXPECT_EQ(kSkipError, opj_skip_from_memory(1, ptr)); + EXPECT_FALSE(opj_seek_from_memory(1, ptr)); +} + +TEST(fxcodec, DecodeDataNullStream) { + DecodeData dd(nullptr, 0); + unsigned char buffer[16]; + + // Reads of size 0 do nothing but return an error code. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 0, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + + // Reads of nonzero size do nothing but return an error code. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, sizeof(buffer), &dd)); + EXPECT_EQ(0xbd, buffer[0]); + + // writes of size 0 do nothing but return an error code. + EXPECT_EQ(kReadError, opj_write_from_memory(buffer, 0, &dd)); + + // writes of nonzero size do nothing but return an error code. + EXPECT_EQ(kReadError, opj_write_from_memory(buffer, sizeof(buffer), &dd)); + + // Skips of size 0 always return an error code. + EXPECT_EQ(kReadError, opj_skip_from_memory(0, &dd)); + + // Skips of nonzero size always return an error code. + EXPECT_EQ(kReadError, opj_skip_from_memory(1, &dd)); + + // Seeks to 0 offset return in error. + EXPECT_FALSE(opj_seek_from_memory(0, &dd)); + + // Seeks to non-zero offsets return in error. + EXPECT_FALSE(opj_seek_from_memory(1, &dd)); +} + +TEST(fxcodec, DecodeDataZeroSize) { + DecodeData dd(stream_data, 0); + unsigned char buffer[16]; + + // Reads of size 0 do nothing but return an error code. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 0, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + + // Reads of nonzero size do nothing but return an error code. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, sizeof(buffer), &dd)); + EXPECT_EQ(0xbd, buffer[0]); + + // writes of size 0 do nothing but return an error code. + EXPECT_EQ(kReadError, opj_write_from_memory(buffer, 0, &dd)); + + // writes of nonzero size do nothing but return an error code. + EXPECT_EQ(kReadError, opj_write_from_memory(buffer, sizeof(buffer), &dd)); + + // Skips of size 0 always return an error code. + EXPECT_EQ(kReadError, opj_skip_from_memory(0, &dd)); + + // Skips of nonzero size always return an error code. + EXPECT_EQ(kReadError, opj_skip_from_memory(1, &dd)); + + // Seeks to 0 offset return in error. + EXPECT_FALSE(opj_seek_from_memory(0, &dd)); + + // Seeks to non-zero offsets return in error. + EXPECT_FALSE(opj_seek_from_memory(1, &dd)); +} + +TEST(fxcodec, DecodeDataReadInBounds) { + unsigned char buffer[16]; + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Exact sized read in a single call. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(8u, opj_read_from_memory(buffer, sizeof(buffer), &dd)); + EXPECT_EQ(0x00, buffer[0]); + EXPECT_EQ(0x01, buffer[1]); + EXPECT_EQ(0x02, buffer[2]); + EXPECT_EQ(0x03, buffer[3]); + EXPECT_EQ(0x84, buffer[4]); + EXPECT_EQ(0x85, buffer[5]); + EXPECT_EQ(0x86, buffer[6]); + EXPECT_EQ(0x87, buffer[7]); + EXPECT_EQ(0xbd, buffer[8]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Simple read. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(2u, opj_read_from_memory(buffer, 2, &dd)); + EXPECT_EQ(0x00, buffer[0]); + EXPECT_EQ(0x01, buffer[1]); + EXPECT_EQ(0xbd, buffer[2]); + + // Read of size 0 doesn't affect things. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(0u, opj_read_from_memory(buffer, 0, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + + // Read exactly up to end of data. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(6u, opj_read_from_memory(buffer, 6, &dd)); + EXPECT_EQ(0x02, buffer[0]); + EXPECT_EQ(0x03, buffer[1]); + EXPECT_EQ(0x84, buffer[2]); + EXPECT_EQ(0x85, buffer[3]); + EXPECT_EQ(0x86, buffer[4]); + EXPECT_EQ(0x87, buffer[5]); + EXPECT_EQ(0xbd, buffer[6]); + + // Read of size 0 at EOF is still an error. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 0, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + } +} + +TEST(fxcodec, DecodeDataReadBeyondBounds) { + unsigned char buffer[16]; + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Read beyond bounds in a single step. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(8u, opj_read_from_memory(buffer, sizeof(buffer) + 1, &dd)); + EXPECT_EQ(0x00, buffer[0]); + EXPECT_EQ(0x01, buffer[1]); + EXPECT_EQ(0x02, buffer[2]); + EXPECT_EQ(0x03, buffer[3]); + EXPECT_EQ(0x84, buffer[4]); + EXPECT_EQ(0x85, buffer[5]); + EXPECT_EQ(0x86, buffer[6]); + EXPECT_EQ(0x87, buffer[7]); + EXPECT_EQ(0xbd, buffer[8]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Read well beyond bounds in a single step. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(8u, opj_read_from_memory( + buffer, std::numeric_limits<OPJ_SIZE_T>::max(), &dd)); + EXPECT_EQ(0x00, buffer[0]); + EXPECT_EQ(0x01, buffer[1]); + EXPECT_EQ(0x02, buffer[2]); + EXPECT_EQ(0x03, buffer[3]); + EXPECT_EQ(0x84, buffer[4]); + EXPECT_EQ(0x85, buffer[5]); + EXPECT_EQ(0x86, buffer[6]); + EXPECT_EQ(0x87, buffer[7]); + EXPECT_EQ(0xbd, buffer[8]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Read of size 6 gets first 6 bytes. + // rest of buffer intact. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(6u, opj_read_from_memory(buffer, 6, &dd)); + EXPECT_EQ(0x00, buffer[0]); + EXPECT_EQ(0x01, buffer[1]); + EXPECT_EQ(0x02, buffer[2]); + EXPECT_EQ(0x03, buffer[3]); + EXPECT_EQ(0x84, buffer[4]); + EXPECT_EQ(0x85, buffer[5]); + EXPECT_EQ(0xbd, buffer[6]); + + // Read of size 6 gets remaining two bytes. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(2u, opj_read_from_memory(buffer, 6, &dd)); + EXPECT_EQ(0x86, buffer[0]); + EXPECT_EQ(0x87, buffer[1]); + EXPECT_EQ(0xbd, buffer[2]); + + // Read of 6 more gets nothing and leaves rest of buffer intact. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 6, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + } +} + +TEST(fxcodec, DecodeDataWriteInBounds) { + unsigned char stream[16]; + static unsigned char buffer_data[] = { + 0x00, 0x01, 0x02, 0x03, 0x80, + 0x80, 0x81, 0x82, 0x83, 0x84, + }; + { + // Pretend the stream can only hold 4 bytes. + DecodeData dd(stream, 4); + + memset(stream, 0xbd, sizeof(stream)); + EXPECT_EQ(4u, opj_write_from_memory(buffer_data, 4, &dd)); + EXPECT_EQ(0x00, stream[0]); + EXPECT_EQ(0x01, stream[1]); + EXPECT_EQ(0x02, stream[2]); + EXPECT_EQ(0x03, stream[3]); + EXPECT_EQ(0xbd, stream[4]); + } + { + // Pretend the stream can only hold 4 bytes. + DecodeData dd(stream, 4); + + memset(stream, 0xbd, sizeof(stream)); + EXPECT_EQ(2u, opj_write_from_memory(buffer_data, 2, &dd)); + EXPECT_EQ(2u, opj_write_from_memory(buffer_data, 2, &dd)); + EXPECT_EQ(0x00, stream[0]); + EXPECT_EQ(0x01, stream[1]); + EXPECT_EQ(0x00, stream[2]); + EXPECT_EQ(0x01, stream[3]); + EXPECT_EQ(0xbd, stream[4]); + } +} + +TEST(fxcodec, DecodeDataWriteBeyondBounds) { + unsigned char stream[16]; + static unsigned char buffer_data[] = { + 0x10, 0x11, 0x12, 0x13, + 0x94, 0x95, 0x96, 0x97, + }; + { + // Pretend the stream can only hold 4 bytes. + DecodeData dd(stream, 4); + + // Write ending past EOF transfers up til EOF. + memset(stream, 0xbd, sizeof(stream)); + EXPECT_EQ(4u, opj_write_from_memory(buffer_data, 5, &dd)); + EXPECT_EQ(0x10, stream[0]); + EXPECT_EQ(0x11, stream[1]); + EXPECT_EQ(0x12, stream[2]); + EXPECT_EQ(0x13, stream[3]); + EXPECT_EQ(0xbd, stream[4]); + + // Subsequent writes fail. + memset(stream, 0xbd, sizeof(stream)); + EXPECT_EQ(kWriteError, opj_write_from_memory(buffer_data, 5, &dd)); + EXPECT_EQ(0xbd, stream[0]); + } + { + // Pretend the stream can only hold 4 bytes. + DecodeData dd(stream, 4); + + // Write ending past EOF (two steps) transfers up til EOF. + memset(stream, 0xbd, sizeof(stream)); + EXPECT_EQ(2u, opj_write_from_memory(buffer_data, 2, &dd)); + EXPECT_EQ(2u, opj_write_from_memory(buffer_data, 4, &dd)); + EXPECT_EQ(0x10, stream[0]); + EXPECT_EQ(0x11, stream[1]); + EXPECT_EQ(0x10, stream[2]); + EXPECT_EQ(0x11, stream[3]); + EXPECT_EQ(0xbd, stream[4]); + + // Subsequent writes fail. + memset(stream, 0xbd, sizeof(stream)); + EXPECT_EQ(kWriteError, opj_write_from_memory(buffer_data, 5, &dd)); + EXPECT_EQ(0xbd, stream[0]); + } +} + +// Note: Some care needs to be taken here because the skip/seek functions +// take OPJ_OFF_T's as arguments, which are typically a signed type. +TEST(fxcodec, DecodeDataSkip) { + unsigned char buffer[16]; + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Skiping within buffer is allowed. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(1, opj_skip_from_memory(1, &dd)); + EXPECT_EQ(1u, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x01, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Skiping 0 bytes changes nothing. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(0, opj_skip_from_memory(0, &dd)); + EXPECT_EQ(1u, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x02, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Skiping to EOS-1 is possible. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(4, opj_skip_from_memory(4, &dd)); + EXPECT_EQ(1u, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x87, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Next read fails. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Skiping directly to EOS is allowed. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(8, opj_skip_from_memory(8, &dd)); + + // Next read fails. + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Skipping beyond end of stream is allowed and returns full distance. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(9, opj_skip_from_memory(9, &dd)); + + // Next read fails. + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Skipping way beyond EOS is allowd, doesn't wrap, and returns + // full distance. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(4, opj_skip_from_memory(4, &dd)); + EXPECT_EQ(std::numeric_limits<OPJ_OFF_T>::max(), opj_skip_from_memory( + std::numeric_limits<OPJ_OFF_T>::max(), &dd)); + + // Next read fails. If it succeeds, it may mean we wrapped. + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Negative skip within buffer not is allowed, position unchanged. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(4, opj_skip_from_memory(4, &dd)); + EXPECT_EQ(kSkipError, opj_skip_from_memory(-2, &dd)); + + // Next read succeeds as if nothing has happenned. + EXPECT_EQ(1u, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x84, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Negative skip before buffer is not allowed, position unchanged. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(kSkipError, opj_skip_from_memory(-4, &dd)); + + // Next read succeeds as if nothing has happenned. + EXPECT_EQ(1u, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x85, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Negative skip way before buffer is not allowed, doesn't wrap + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(4, opj_skip_from_memory(4, &dd)); + EXPECT_EQ(kSkipError, opj_skip_from_memory( + std::numeric_limits<OPJ_OFF_T>::min(), &dd)); + + // Next read succeeds. If it fails, it may mean we wrapped. + EXPECT_EQ(1, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x84, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + } + { + DecodeData dd(stream_data, sizeof(stream_data)); + + // Negative skip after EOS isn't alowed, still EOS. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_EQ(8, opj_skip_from_memory(8, &dd)); + EXPECT_EQ(kSkipError, opj_skip_from_memory(-4, &dd)); + + // Next read fails. + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + } + +} + +TEST(fxcodec, DecodeDataSeek) { + unsigned char buffer[16]; + DecodeData dd(stream_data, sizeof(stream_data)); + + // Seeking within buffer is allowed and read succeeds + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_TRUE(opj_seek_from_memory(1, &dd)); + EXPECT_EQ(1u, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x01, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Seeking before start returns error leaving position unchanged. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_FALSE(opj_seek_from_memory(-1, &dd)); + EXPECT_EQ(1, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x02, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Seeking way before start returns error leaving position unchanged. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_FALSE(opj_seek_from_memory( + std::numeric_limits<OPJ_OFF_T>::min(), &dd)); + EXPECT_EQ(1, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x03, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Seeking exactly to EOS is allowed but read fails. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_TRUE(opj_seek_from_memory(8, &dd)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + + // Seeking back to zero offset is allowed and read succeeds. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_TRUE(opj_seek_from_memory(0, &dd)); + EXPECT_EQ(1u, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x00, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Seeking beyond end of stream is allowed but read fails. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_TRUE(opj_seek_from_memory(16, &dd)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0xbd, buffer[0]); + + // Seeking within buffer after seek past EOF restores good state. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_TRUE(opj_seek_from_memory(4, &dd)); + EXPECT_EQ(1u, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0x84, buffer[0]); + EXPECT_EQ(0xbd, buffer[1]); + + // Seeking way beyond EOS is allowed, doesn't wrap, and read fails. + memset(buffer, 0xbd, sizeof(buffer)); + EXPECT_TRUE(opj_seek_from_memory( + std::numeric_limits<OPJ_OFF_T>::max(), &dd)); + EXPECT_EQ(kReadError, opj_read_from_memory(buffer, 1, &dd)); + EXPECT_EQ(0xbd, buffer[0]); +} |