| //===--------------- J3Reader.cpp - Open and read files ---------------------===// |
| // |
| // The VMKit project |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include <cstdio> |
| #include <cstring> |
| #include <assert.h> |
| |
| #include "j3/j3reader.h" |
| #include "j3/j3zip.h" |
| |
| using namespace j3; |
| |
| const int J3Reader::SeekSet = SEEK_SET; |
| const int J3Reader::SeekCur = SEEK_CUR; |
| const int J3Reader::SeekEnd = SEEK_END; |
| |
| J3ClassBytes* J3Reader::openFile(vmkit::BumpAllocator* a, const char* path) { |
| J3ClassBytes* res = NULL; |
| FILE* fp = fopen(path, "r"); |
| if (fp != 0) { |
| fseek(fp, 0, SeekEnd); |
| long nbb = ftell(fp); |
| fseek(fp, 0, SeekSet); |
| res = new (a, nbb) J3ClassBytes(nbb); |
| if (fread(res->elements, nbb, 1, fp) == 0) { |
| fprintf(stderr, "fread error\n"); |
| abort(); |
| } |
| fclose(fp); |
| } |
| return res; |
| } |
| |
| J3ClassBytes* J3Reader::openZip(vmkit::BumpAllocator* allocator, J3ZipArchive* archive, |
| const char* filename) { |
| J3ClassBytes* res = 0; |
| J3ZipFile* file = archive->getFile(filename); |
| if (file != 0) { |
| res = new (allocator, file->ucsize) J3ClassBytes(file->ucsize); |
| if (archive->readFile(res, file) != 0) { |
| return res; |
| } |
| } |
| return NULL; |
| } |
| |
| void J3Reader::seek(uint32_t pos, int from) { |
| uint32_t n = 0; |
| uint32_t start = min; |
| uint32_t end = max; |
| |
| if (from == SeekCur) n = cursor + pos; |
| else if (from == SeekSet) n = start + pos; |
| else if (from == SeekEnd) n = end + pos; |
| |
| |
| assert(n >= start && n <= end && "out of range"); |
| |
| cursor = n; |
| } |
| |
| bool J3Reader::adjustSize(uint32_t length) { |
| if(cursor + length >= max) |
| return 0; |
| |
| max = cursor + length; |
| |
| return 1; |
| } |