420 lines
7.8 KiB
C++
420 lines
7.8 KiB
C++
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/*
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* REminiscence - Flashback interpreter
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* Copyright (C) 2005-2019 Gregory Montoir (cyx@users.sourceforge.net)
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*/
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#include <sys/param.h>
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#include "file.h"
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#include "fs.h"
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#include "util.h"
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#ifdef USE_ZLIB
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#include "zlib.h"
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#endif
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#ifdef USE_RWOPS
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#include <SDL_filesystem.h>
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#include <SDL_rwops.h>
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#endif
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struct File_impl {
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bool _ioErr;
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File_impl() : _ioErr(false) {}
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virtual ~File_impl() {}
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virtual bool open(const char *path, const char *mode) = 0;
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virtual void close() = 0;
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virtual uint32_t size() = 0;
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virtual void seek(int32_t off) = 0;
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virtual uint32_t read(void *ptr, uint32_t len) = 0;
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virtual uint32_t write(const void *ptr, uint32_t len) = 0;
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};
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struct StdioFile : File_impl {
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FILE *_fp;
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StdioFile() : _fp(0) {}
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bool open(const char *path, const char *mode) {
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_ioErr = false;
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_fp = fopen(path, mode);
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return (_fp != 0);
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}
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void close() {
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if (_fp) {
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fclose(_fp);
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_fp = 0;
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}
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}
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uint32_t size() {
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uint32_t sz = 0;
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if (_fp) {
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int pos = ftell(_fp);
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fseek(_fp, 0, SEEK_END);
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sz = ftell(_fp);
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fseek(_fp, pos, SEEK_SET);
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}
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return sz;
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}
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void seek(int32_t off) {
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if (_fp) {
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fseek(_fp, off, SEEK_SET);
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}
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}
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uint32_t read(void *ptr, uint32_t len) {
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if (_fp) {
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uint32_t r = fread(ptr, 1, len, _fp);
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if (r != len) {
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_ioErr = true;
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}
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return r;
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}
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return 0;
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}
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uint32_t write(const void *ptr, uint32_t len) {
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if (_fp) {
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uint32_t r = fwrite(ptr, 1, len, _fp);
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if (r != len) {
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_ioErr = true;
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}
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return r;
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}
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return 0;
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}
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};
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#ifdef USE_ZLIB
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struct GzipFile : File_impl {
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gzFile _fp;
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GzipFile() : _fp(0) {}
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bool open(const char *path, const char *mode) {
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_ioErr = false;
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_fp = gzopen(path, mode);
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return (_fp != 0);
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}
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void close() {
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if (_fp) {
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gzclose(_fp);
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_fp = 0;
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}
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}
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uint32_t size() {
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uint32_t sz = 0;
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if (_fp) {
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int pos = gztell(_fp);
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gzseek(_fp, 0, SEEK_END);
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sz = gztell(_fp);
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gzseek(_fp, pos, SEEK_SET);
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}
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return sz;
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}
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void seek(int32_t off) {
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if (_fp) {
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gzseek(_fp, off, SEEK_SET);
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}
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}
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uint32_t read(void *ptr, uint32_t len) {
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if (_fp) {
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uint32_t r = gzread(_fp, ptr, len);
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if (r != len) {
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_ioErr = true;
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}
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return r;
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}
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return 0;
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}
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uint32_t write(const void *ptr, uint32_t len) {
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if (_fp) {
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uint32_t r = gzwrite(_fp, ptr, len);
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if (r != len) {
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_ioErr = true;
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}
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return r;
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}
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return 0;
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}
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};
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#endif
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#ifdef USE_RWOPS
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struct AssetFile: File_impl {
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SDL_RWops *_rw;
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AssetFile() : _rw(0) {}
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bool prefixedOpen(const char *prefix, const char *name) {
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char path[MAXPATHLEN];
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snprintf(path, sizeof(path), "%s%s", prefix, name);
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_rw = SDL_RWFromFile(path, "rb");
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if (!_rw) {
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// try uppercase
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char fixedPath[MAXPATHLEN];
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{
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int i = 0;
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for (; path[i] && i < MAXPATHLEN - 1; ++i) {
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fixedPath[i] = path[i];
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if (i < strlen(prefix)) {
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continue;
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}
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if (fixedPath[i] >= 'a' && fixedPath[i] <= 'z') {
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fixedPath[i] += 'A' - 'a';
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}
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}
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fixedPath[i] = 0;
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}
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_rw = SDL_RWFromFile(fixedPath, "rb");
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}
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return _rw != 0;
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}
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bool open(const char *path, const char *mode) {
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_ioErr = false;
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return prefixedOpen("", path) || prefixedOpen("/sdcard/flashback/", path);
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}
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void close() {
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if (_rw) {
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SDL_RWclose(_rw);
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_rw = 0;
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}
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}
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uint32_t size() {
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if (_rw) {
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return SDL_RWsize(_rw);
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}
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return 0;
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}
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void seek(int32_t off) {
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if (_rw) {
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SDL_RWseek(_rw, off, RW_SEEK_SET);
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}
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}
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uint32_t read(void *ptr, uint32_t len) {
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if (_rw) {
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const int count = SDL_RWread(_rw, ptr, 1, len);
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if (count != len) {
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_ioErr = true;
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}
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}
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return 0;
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}
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uint32_t write(const void *ptr, uint32_t len) {
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_ioErr = true;
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return 0;
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}
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};
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#endif
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struct MemoryBufferFile: File_impl {
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uint8_t *_ptr;
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uint32_t _capacity, _offset, _len;
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MemoryBufferFile(int initialCapacity) {
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_capacity = initialCapacity;
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_ptr = (uint8_t *)malloc(_capacity);
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_offset = _len = 0;
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}
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~MemoryBufferFile() {
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free(_ptr);
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}
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bool open(const char *path, const char *mode) {
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return false;
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}
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void close() {
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}
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uint32_t size() {
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return _len;
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}
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uint32_t tell() {
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return _offset;
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}
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void seek(int offs) {
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_offset = offs;
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}
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uint32_t read(void *ptr, uint32_t len) {
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int count = len;
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if (_offset + count > _len) {
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count = _len - _offset;
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_ioErr = true;
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}
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if (count != 0) {
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memcpy(ptr, _ptr + _offset, count);
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_offset += count;
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}
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return count;
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}
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uint32_t write(const void *ptr, uint32_t len) {
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int count = len;
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while (_offset + count > _capacity) {
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_capacity *= 2;
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_ptr = (uint8_t *)realloc(_ptr, _capacity);
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}
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if (count != 0) {
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memcpy(_ptr + _offset, ptr, count);
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_offset += count;
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}
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_len = _offset;
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return count;
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}
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};
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File::File()
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: _impl(0) {
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}
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File::~File() {
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if (_impl) {
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_impl->close();
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delete _impl;
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}
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}
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bool File::open(const char *filename, const char *mode, FileSystem *fs) {
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if (_impl) {
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_impl->close();
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delete _impl;
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_impl = 0;
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}
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assert(mode[0] != 'z');
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_impl = new StdioFile;
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char *path = fs->findPath(filename);
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if (path) {
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debug(DBG_FILE, "Open file name '%s' mode '%s' path '%s'", filename, mode, path);
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bool ret = _impl->open(path, mode);
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free(path);
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return ret;
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}
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#ifdef USE_RWOPS
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if (mode[0] == 'r') {
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_impl = new AssetFile;
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return _impl->open(filename, mode);
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} else if (mode[0] == 'w') {
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bool ret = false;
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char *prefPath = SDL_GetPrefPath("org.cyxdown", "fb");
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if (prefPath) {
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char path[MAXPATHLEN];
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snprintf(path, sizeof(path), "%s/%s", prefPath, filename);
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_impl = new StdioFile;
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ret = _impl->open(path, mode);
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SDL_free(prefPath);
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}
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return ret;
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}
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#endif
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return false;
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}
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bool File::open(const char *filename, const char *mode, const char *directory) {
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if (_impl) {
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_impl->close();
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delete _impl;
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_impl = 0;
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}
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#ifdef USE_ZLIB
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if (mode[0] == 'z') {
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_impl = new GzipFile;
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++mode;
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}
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#endif
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if (!_impl) {
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_impl = new StdioFile;
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}
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char path[MAXPATHLEN];
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snprintf(path, sizeof(path), "%s/%s", directory, filename);
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debug(DBG_FILE, "Open file name '%s' mode '%s' path '%s'", filename, mode, path);
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return _impl->open(path, mode);
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}
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void File::openMemoryBuffer(int initialCapacity) {
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if (_impl) {
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_impl->close();
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delete _impl;
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_impl = 0;
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}
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_impl = new MemoryBufferFile(initialCapacity);
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}
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void File::close() {
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if (_impl) {
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_impl->close();
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}
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}
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bool File::ioErr() const {
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return _impl->_ioErr;
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}
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uint32_t File::size() {
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return _impl->size();
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}
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void File::seek(int32_t off) {
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_impl->seek(off);
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}
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uint32_t File::read(void *ptr, uint32_t len) {
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return _impl->read(ptr, len);
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}
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uint8_t File::readByte() {
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uint8_t b;
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read(&b, 1);
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return b;
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}
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uint16_t File::readUint16LE() {
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uint8_t lo = readByte();
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uint8_t hi = readByte();
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return (hi << 8) | lo;
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}
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uint32_t File::readUint32LE() {
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uint16_t lo = readUint16LE();
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uint16_t hi = readUint16LE();
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return (hi << 16) | lo;
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}
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uint16_t File::readUint16BE() {
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uint8_t hi = readByte();
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uint8_t lo = readByte();
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return (hi << 8) | lo;
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}
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uint32_t File::readUint32BE() {
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uint16_t hi = readUint16BE();
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uint16_t lo = readUint16BE();
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return (hi << 16) | lo;
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}
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uint32_t File::write(const void *ptr, uint32_t len) {
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return _impl->write(ptr, len);
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}
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void File::writeByte(uint8_t b) {
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write(&b, 1);
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}
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void File::writeUint16LE(uint16_t n) {
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writeByte(n & 0xFF);
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writeByte(n >> 8);
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}
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void File::writeUint32LE(uint32_t n) {
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writeUint16LE(n & 0xFFFF);
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writeUint16LE(n >> 16);
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}
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void File::writeUint16BE(uint16_t n) {
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writeByte(n >> 8);
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writeByte(n & 0xFF);
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}
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void File::writeUint32BE(uint32_t n) {
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writeUint16BE(n >> 16);
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writeUint16BE(n & 0xFFFF);
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}
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void dumpFile(const char *filename, const uint8_t *p, int size) {
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char path[MAXPATHLEN];
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snprintf(path, sizeof(path), "DUMP/%s", filename);
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FILE *fp = fopen(filename, "wb");
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if (fp) {
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const int count = fwrite(p, 1, size, fp);
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if (count != size) {
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warning("Failed to write %d bytes (expected %d)", count, size);
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}
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fclose(fp);
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}
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}
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