bool binary_to_compressed_c(const char* filename, const char* symbol, bool use_base85_encoding, bool use_compression)
{
// Read file
FILE* f = fopen(filename, "rb");
if (!f) return false;
int data_sz;
if (fseek(f, 0, SEEK_END) || (data_sz = (int)ftell(f)) == -1 || fseek(f, 0, SEEK_SET)) { fclose(f); return false; }
char* data = new char[data_sz+4];
if (fread(data, 1, data_sz, f) != (size_t)data_sz) { fclose(f); delete[] data; return false; }
memset((void *)(((char*)data) + data_sz), 0, 4);
fclose(f);
// Compress
int maxlen = data_sz + 512 + (data_sz >> 2) + sizeof(int); // total guess
char* compressed = use_compression ? new char[maxlen] : data;
int compressed_sz = use_compression ? stb_compress((stb_uchar*)compressed, (stb_uchar*)data, data_sz) : data_sz;
if (use_compression)
memset(compressed + compressed_sz, 0, maxlen - compressed_sz);
// Output as Base85 encoded
FILE* out = stdout;
fprintf(out, "// File: '%s' (%d bytes)\n", filename, (int)data_sz);
fprintf(out, "// Exported using binary_to_compressed_c.cpp\n");
const char* compressed_str = use_compression ? "compressed_" : "";
if (use_base85_encoding)
{
fprintf(out, "static const char %s_%sdata_base85[%d+1] =\n \"", symbol, compressed_str, (int)((compressed_sz+3)/4)*5);
int column = 0;
for (int i = 0; i < compressed_sz; i += 4)
{
unsigned int d = *(unsigned int*)(compressed + i);
fprintf(out, "%c%c%c%c%c", Encode85Byte(d), Encode85Byte(d/85), Encode85Byte(d/7225), Encode85Byte(d/614125), Encode85Byte(d/52200625));
if ((i % 112) == 112-4)
fprintf(out, "\"\n \"");
}
fprintf(out, "\";\n\n");
}
else
{
fprintf(out, "static const unsigned int %s_%ssize = %d;\n", symbol, compressed_str, (int)compressed_sz);
fprintf(out, "static const unsigned int %s_%sdata[%d/4] =\n{", symbol, compressed_str, (int)((compressed_sz+3)/4)*4);
int column = 0;
for (int i = 0; i < compressed_sz; i += 4)
{
unsigned int d = *(unsigned int*)(compressed + i);
if ((column++ % 12) == 0)
fprintf(out, "\n 0x%08x, ", d);
else
fprintf(out, "0x%08x, ", d);
}
fprintf(out, "\n};\n\n");
}
// Cleanup
delete[] data;
if (use_compression)
delete[] compressed;
return true;
}
bool binary_to_compressed_c(const char* filename, const char* symbol, bool use_base85_encoding, bool use_compression)
{
// Read file
FILE* f = fopen(filename, "rb");
if (!f) return false;
int data_sz;
if (fseek(f, 0, SEEK_END) || (data_sz = (int)ftell(f)) == -1 || fseek(f, 0, SEEK_SET)) { fclose(f); return false; }
char* data = new char[data_sz+4];
if (fread(data, 1, data_sz, f) != (size_t)data_sz) { fclose(f); delete[] data; return false; }
memset((void *)(((char*)data) + data_sz), 0, 4);
fclose(f);
// Compress
int maxlen = data_sz + 512 + (data_sz >> 2) + sizeof(int); // total guess
char* compressed = use_compression ? new char[maxlen] : data;
int compressed_sz = use_compression ? stb_compress((stb_uchar*)compressed, (stb_uchar*)data, data_sz) : data_sz;
if (use_compression)
memset(compressed + compressed_sz, 0, maxlen - compressed_sz);
// Output as Base85 encoded
FILE* out = stdout;
fprintf(out, "// File: '%s' (%d bytes)\n", filename, (int)data_sz);
fprintf(out, "// Exported using binary_to_compressed_c.cpp\n");
const char* compressed_str = use_compression ? "compressed_" : "";
if (use_base85_encoding)
{
fprintf(out, "static const char %s_%sdata_base85[%d+1] =\n \"", symbol, compressed_str, (int)((compressed_sz+3)/4)*5);
char prev_c = 0;
for (int src_i = 0; src_i < compressed_sz; src_i += 4)
{
// This is made a little more complicated by the fact that ??X sequences are interpreted as trigraphs by old C/C++ compilers. So we need to escape pairs of ??.
unsigned int d = *(unsigned int*)(compressed + src_i);
for (unsigned int n5 = 0; n5 < 5; n5++, d /= 85)
{
char c = Encode85Byte(d);
fprintf(out, (c == '?' && prev_c == '?') ? "\\%c" : "%c", c);
prev_c = c;
}
if ((src_i % 112) == 112-4)
fprintf(out, "\"\n \"");
}
fprintf(out, "\";\n\n");
}
else
{
fprintf(out, "static const unsigned int %s_%ssize = %d;\n", symbol, compressed_str, (int)compressed_sz);
fprintf(out, "static const unsigned int %s_%sdata[%d/4] =\n{", symbol, compressed_str, (int)((compressed_sz+3)/4)*4);
int column = 0;
for (int i = 0; i < compressed_sz; i += 4)
{
unsigned int d = *(unsigned int*)(compressed + i);
if ((column++ % 12) == 0)
fprintf(out, "\n 0x%08x, ", d);
else
fprintf(out, "0x%08x, ", d);
}
fprintf(out, "\n};\n\n");
}
// Cleanup
delete[] data;
if (use_compression)
delete[] compressed;
return true;
}
