mirror of https://github.com/bsnes-emu/bsnes.git
127 lines
2.9 KiB
C++
127 lines
2.9 KiB
C++
#ifndef NALL_DECODE_ZIP_HPP
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#define NALL_DECODE_ZIP_HPP
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#include <nall/filemap.hpp>
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#include <nall/string.hpp>
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#include <nall/vector.hpp>
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#include <nall/decode/inflate.hpp>
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namespace nall { namespace Decode {
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struct ZIP {
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struct File {
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string name;
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const uint8_t* data;
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unsigned size;
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unsigned csize;
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unsigned cmode; //0 = uncompressed, 8 = deflate
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unsigned crc32;
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};
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inline bool open(const string& filename) {
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close();
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if(fm.open(filename, filemap::mode::read) == false) return false;
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if(open(fm.data(), fm.size()) == false) {
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fm.close();
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return false;
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}
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return true;
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}
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inline bool open(const uint8_t* data, unsigned size) {
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if(size < 22) return false;
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filedata = data;
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filesize = size;
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file.reset();
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const uint8_t* footer = data + size - 22;
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while(true) {
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if(footer <= data + 22) return false;
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if(read(footer, 4) == 0x06054b50) {
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unsigned commentlength = read(footer + 20, 2);
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if(footer + 22 + commentlength == data + size) break;
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}
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footer--;
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}
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const uint8_t* directory = data + read(footer + 16, 4);
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while(true) {
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unsigned signature = read(directory + 0, 4);
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if(signature != 0x02014b50) break;
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File file;
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file.cmode = read(directory + 10, 2);
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file.crc32 = read(directory + 16, 4);
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file.csize = read(directory + 20, 4);
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file.size = read(directory + 24, 4);
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unsigned namelength = read(directory + 28, 2);
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unsigned extralength = read(directory + 30, 2);
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unsigned commentlength = read(directory + 32, 2);
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char* filename = new char[namelength + 1];
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memcpy(filename, directory + 46, namelength);
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filename[namelength] = 0;
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file.name = filename;
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delete[] filename;
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unsigned offset = read(directory + 42, 4);
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unsigned offsetNL = read(data + offset + 26, 2);
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unsigned offsetEL = read(data + offset + 28, 2);
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file.data = data + offset + 30 + offsetNL + offsetEL;
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directory += 46 + namelength + extralength + commentlength;
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this->file.append(file);
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}
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return true;
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}
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inline vector<uint8_t> extract(File& file) {
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vector<uint8_t> buffer;
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if(file.cmode == 0) {
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buffer.resize(file.size);
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memcpy(buffer.data(), file.data, file.size);
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}
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if(file.cmode == 8) {
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buffer.resize(file.size);
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if(inflate(buffer.data(), buffer.size(), file.data, file.csize) == false) {
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buffer.reset();
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}
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}
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return buffer;
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}
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inline void close() {
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if(fm.open()) fm.close();
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}
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~ZIP() {
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close();
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}
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protected:
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filemap fm;
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const uint8_t* filedata;
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unsigned filesize;
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unsigned read(const uint8_t* data, unsigned size) {
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unsigned result = 0, shift = 0;
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while(size--) { result |= *data++ << shift; shift += 8; }
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return result;
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}
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public:
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vector<File> file;
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};
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}}
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#endif
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