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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmHexFileConverter.h"
#include <cctype>
#include <cstdio>
#include <cstring>
#include "cmSystemTools.h"
#define INTEL_HEX_MIN_LINE_LENGTH (1 + 8 + 2)
#define INTEL_HEX_MAX_LINE_LENGTH (1 + 8 + (256 * 2) + 2)
#define MOTOROLA_SREC_MIN_LINE_LENGTH (2 + 2 + 4 + 2)
#define MOTOROLA_SREC_MAX_LINE_LENGTH (2 + 2 + 8 + (256 * 2) + 2)
static unsigned int ChompStrlen(const char* line)
{
if (line == nullptr) {
return 0;
}
unsigned int length = static_cast<unsigned int>(strlen(line));
if ((line[length - 1] == '\n') || (line[length - 1] == '\r')) {
length--;
}
if ((line[length - 1] == '\n') || (line[length - 1] == '\r')) {
length--;
}
return length;
}
static bool OutputBin(FILE* file, const char* buf, unsigned int startIndex,
unsigned int stopIndex)
{
bool success = true;
char hexNumber[3];
hexNumber[2] = '\0';
char outBuf[256];
unsigned int outBufCount = 0;
for (unsigned int i = startIndex; i < stopIndex; i += 2) {
hexNumber[0] = buf[i];
hexNumber[1] = buf[i + 1];
unsigned int convertedByte = 0;
if (sscanf(hexNumber, "%x", &convertedByte) != 1) {
success = false;
break;
}
outBuf[outBufCount] = static_cast<char>(convertedByte & 0xff);
outBufCount++;
}
if (success) {
success = (fwrite(outBuf, 1, outBufCount, file) == outBufCount);
}
return success;
}
// see http://www.die.net/doc/linux/man/man5/srec.5.html
static bool ConvertMotorolaSrecLine(const char* buf, FILE* outFile)
{
unsigned int slen = ChompStrlen(buf);
if ((slen < MOTOROLA_SREC_MIN_LINE_LENGTH) ||
(slen > MOTOROLA_SREC_MAX_LINE_LENGTH)) {
return false;
}
// line length must be even
if (slen % 2 == 1) {
return false;
}
if (buf[0] != 'S') {
return false;
}
unsigned int dataStart = 0;
// ignore extra address records
if ((buf[1] == '5') || (buf[1] == '7') || (buf[1] == '8') ||
(buf[1] == '9')) {
return true;
}
if (buf[1] == '1') {
dataStart = 8;
} else if (buf[1] == '2') {
dataStart = 10;
} else if (buf[1] == '3') {
dataStart = 12;
} else // unknown record type
{
return false;
}
// ignore the last two bytes (checksum)
return OutputBin(outFile, buf, dataStart, slen - 2);
}
// see http://en.wikipedia.org/wiki/Intel_hex
static bool ConvertIntelHexLine(const char* buf, FILE* outFile)
{
unsigned int slen = ChompStrlen(buf);
if ((slen < INTEL_HEX_MIN_LINE_LENGTH) ||
(slen > INTEL_HEX_MAX_LINE_LENGTH)) {
return false;
}
// line length must be odd
if (slen % 2 == 0) {
return false;
}
if ((buf[0] != ':') || (buf[7] != '0')) {
return false;
}
unsigned int dataStart = 0;
if ((buf[8] == '0') || (buf[8] == '1')) {
dataStart = 9;
}
// ignore extra address records
else if ((buf[8] == '2') || (buf[8] == '3') || (buf[8] == '4') ||
(buf[8] == '5')) {
return true;
} else // unknown record type
{
return false;
}
// ignore the last two bytes (checksum)
return OutputBin(outFile, buf, dataStart, slen - 2);
}
cmHexFileConverter::FileType cmHexFileConverter::DetermineFileType(
const std::string& inFileName)
{
char buf[1024];
FILE* inFile = cmsys::SystemTools::Fopen(inFileName, "rb");
if (inFile == nullptr) {
return Binary;
}
if (!fgets(buf, 1024, inFile)) {
buf[0] = 0;
}
fclose(inFile);
FileType type = Binary;
unsigned int minLineLength = 0;
unsigned int maxLineLength = 0;
if (buf[0] == ':') // might be an intel hex file
{
type = IntelHex;
minLineLength = INTEL_HEX_MIN_LINE_LENGTH;
maxLineLength = INTEL_HEX_MAX_LINE_LENGTH;
} else if (buf[0] == 'S') // might be a motorola srec file
{
type = MotorolaSrec;
minLineLength = MOTOROLA_SREC_MIN_LINE_LENGTH;
maxLineLength = MOTOROLA_SREC_MAX_LINE_LENGTH;
} else {
return Binary;
}
unsigned int slen = ChompStrlen(buf);
if ((slen < minLineLength) || (slen > maxLineLength)) {
return Binary;
}
for (unsigned int i = 1; i < slen; i++) {
if (!isxdigit(buf[i])) {
return Binary;
}
}
return type;
}
bool cmHexFileConverter::TryConvert(const std::string& inFileName,
const std::string& outFileName)
{
FileType type = DetermineFileType(inFileName);
if (type == Binary) {
return false;
}
// try to open the file
FILE* inFile = cmsys::SystemTools::Fopen(inFileName, "rb");
FILE* outFile = cmsys::SystemTools::Fopen(outFileName, "wb");
if ((inFile == nullptr) || (outFile == nullptr)) {
if (inFile != nullptr) {
fclose(inFile);
}
if (outFile != nullptr) {
fclose(outFile);
}
return false;
}
// convert them line by line
bool success = false;
char buf[1024];
while (fgets(buf, 1024, inFile) != nullptr) {
if (type == MotorolaSrec) {
success = ConvertMotorolaSrecLine(buf, outFile);
} else if (type == IntelHex) {
success = ConvertIntelHexLine(buf, outFile);
}
if (!success) {
break;
}
}
// close them again
fclose(inFile);
fclose(outFile);
return success;
}
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