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@@ -294,6 +294,28 @@ bool UpdateNewGRFConfigPalette(int32 p1)
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}
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/**
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* Get the data section size of a GRF.
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* @param f GRF.
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* @return Size of the data section or SIZE_MAX if the file has no separate data section.
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*/
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size_t GRFGetSizeOfDataSection(FILE *f)
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{
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extern const byte _grf_cont_v2_sig[];
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static const uint header_len = 14;
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byte data[header_len];
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if (fread(data, 1, header_len, f) == header_len) {
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if (data[0] == 0 && data[1] == 0 && MemCmpT(data + 2, _grf_cont_v2_sig, 8) == 0) {
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/* Valid container version 2, get data section size. */
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size_t offset = (data[13] << 24) | (data[12] << 16) | (data[11] << 8) | data[10];
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return header_len + offset;
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}
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}
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return SIZE_MAX;
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}
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/**
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* Calculate the MD5 sum for a GRF, and store it in the config.
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* @param config GRF to compute.
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* @param subdir The subdirectory to look in.
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@@ -310,6 +332,10 @@ static bool CalcGRFMD5Sum(GRFConfig *con
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f = FioFOpenFile(config->filename, "rb", subdir, &size);
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if (f == NULL) return false;
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size_t start = ftell(f);
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size = min(size, GRFGetSizeOfDataSection(f));
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fseek(f, start, SEEK_SET);
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/* calculate md5sum */
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while ((len = fread(buffer, 1, (size > sizeof(buffer)) ? sizeof(buffer) : size, f)) != 0 && size != 0) {
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size -= len;
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