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Structpack: require endianness indicator in format string

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This commit is contained in:
Iliyas Jorio 2022-09-02 20:07:29 +02:00
parent 1ac775071b
commit 98142aa132
1 changed files with 23 additions and 5 deletions
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28
src/Utilities/structpack.cpp
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@ -2,21 +2,39 @@
#include <algorithm>
#include <stdexcept>
#if __BIG_ENDIAN__
#define kNativeEndiannessIndicator '>'
#else
#define kNativeEndiannessIndicator '<'
#endif
static int Unpack(const char* format, char* buffer)
{
int totalBytes = 0;
int repeat = 0;
for (const char* c2 = format; *c2; c2++)
if (!format)
{
throw std::invalid_argument("can't unpack without a format");
}
char endiannessIndicator = format[0];
if (endiannessIndicator != '<' && endiannessIndicator != '>')
{
throw std::invalid_argument("first format char must be endianness indicator");
}
// If the struct's endianness matches our native endianness,
// we won't do the byteswapping, but we'll still check the format string for consistency
bool isNative = endiannessIndicator == kNativeEndiannessIndicator;
for (const char* c2 = format+1; *c2; c2++)
{
char c = *c2;
int fieldLength = -1;
switch (c)
{
case '>': // big endian indicator (for compat with python's struct) - OK just ignore
continue;
case ' ':
case '\r':
case '\n':
@ -68,7 +86,7 @@ static int Unpack(const char* format, char* buffer)
if (!repeat)
repeat = 1;
bool doSwap = fieldLength > 1;
bool doSwap = !isNative && fieldLength > 1;
if (buffer)
{