mirror of https://github.com/bsnes-emu/bsnes.git
86 lines
1.7 KiB
C++
86 lines
1.7 KiB
C++
#ifndef NALL_DECODE_GZIP_HPP
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#define NALL_DECODE_GZIP_HPP
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#include <nall/file.hpp>
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#include <nall/decode/inflate.hpp>
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namespace nall { namespace Decode {
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struct GZIP {
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string filename;
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uint8_t* data = nullptr;
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unsigned size = 0;
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inline bool decompress(const string& filename);
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inline bool decompress(const uint8_t* data, unsigned size);
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inline GZIP();
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inline ~GZIP();
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};
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bool GZIP::decompress(const string& filename) {
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if(auto memory = file::read(filename)) {
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return decompress(memory.data(), memory.size());
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}
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return false;
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}
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bool GZIP::decompress(const uint8_t* data, unsigned size) {
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if(size < 18) return false;
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if(data[0] != 0x1f) return false;
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if(data[1] != 0x8b) return false;
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unsigned cm = data[2];
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unsigned flg = data[3];
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unsigned mtime = data[4];
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mtime |= data[5] << 8;
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mtime |= data[6] << 16;
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mtime |= data[7] << 24;
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unsigned xfl = data[8];
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unsigned os = data[9];
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unsigned p = 10;
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unsigned isize = data[size - 4];
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isize |= data[size - 3] << 8;
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isize |= data[size - 2] << 16;
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isize |= data[size - 1] << 24;
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filename = "";
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if(flg & 0x04) { //FEXTRA
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unsigned xlen = data[p + 0];
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xlen |= data[p + 1] << 8;
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p += 2 + xlen;
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}
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if(flg & 0x08) { //FNAME
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char buffer[PATH_MAX];
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for(unsigned n = 0; n < PATH_MAX; n++, p++) {
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buffer[n] = data[p];
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if(data[p] == 0) break;
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}
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if(data[p++]) return false;
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filename = buffer;
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}
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if(flg & 0x10) { //FCOMMENT
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while(data[p++]);
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}
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if(flg & 0x02) { //FHCRC
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p += 2;
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}
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this->size = isize;
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this->data = new uint8_t[this->size];
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return inflate(this->data, this->size, data + p, size - p - 8);
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}
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GZIP::GZIP() {
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}
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GZIP::~GZIP() {
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if(data) delete[] data;
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}
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}}
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#endif
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