23 lines
947 B
C++
23 lines
947 B
C++
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#include "base85.h"
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using std::vector;
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// Functions modified from Dear ImGui and renamed to avoid collisions.
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static unsigned int DecodeBase85Byte(char c) {
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return c >= '\\' ? c-36 : c-35;
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}
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vector<unsigned char> DecodeBase85(const char *src) {
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vector<unsigned char> dst_vec;
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dst_vec.reserve((strlen(src) / 5) * 4);
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unsigned char *dst = dst_vec.data();
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size_t dst_size = 0;
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while (*src)
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{
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dst_vec.resize(dst_size);
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unsigned int tmp = DecodeBase85Byte(src[0]) + 85 * (DecodeBase85Byte(src[1]) + 85 * (DecodeBase85Byte(src[2]) + 85 * (DecodeBase85Byte(src[3]) + 85 * DecodeBase85Byte(src[4]))));
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dst[0] = ((tmp >> 0) & 0xFF); dst[1] = ((tmp >> 8) & 0xFF); dst[2] = ((tmp >> 16) & 0xFF); dst[3] = ((tmp >> 24) & 0xFF); // We can't assume little-endianness.
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src += 5;
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dst = dst_vec.data() + dst_size;
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dst_size += 4;
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}
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dst_vec.resize(dst_size);
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return dst_vec;
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}
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