REminiscence/file.cpp

420 lines
7.8 KiB
C++

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