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#include "ps_filebuffer.hxx"
using namespace std;
void PS_FileBuffer::put(const void *_data, int _length) {
if (is_readonly) {
fprintf(stderr, "sorry, i can't write to files opened readonly\n");
CRASH();
}
if (_length > BUFFER_SIZE) {
fprintf(stderr, "sorry, i can't write %i bytes at once, only %i\n", _length, BUFFER_SIZE);
CRASH();
}
if (_length == 0) return;
if (size + _length < BUFFER_SIZE) {
memcpy(&buffer[size], _data, _length);
size += _length;
}
else {
flush();
memcpy(buffer, _data, _length);
size = _length;
}
}
void PS_FileBuffer::get(void *_data, int _length) {
if (_length > BUFFER_SIZE) {
fprintf(stderr, "sorry, i can't read %i bytes at once, only %i\n", _length, BUFFER_SIZE);
CRASH();
}
if (_length == 0) return;
if (position + _length <= size) {
memcpy(_data, &buffer[position], _length);
position += _length;
}
else {
refill();
memcpy(_data, buffer, _length);
position = _length;
}
}
void PS_FileBuffer::put_ulong(unsigned long int _ul) {
if (_ul <= 0x7F) { // bit7 == 0 -> 1 byte integer
put_char(_ul);
}
else if (_ul <= 0x3FFF) {
put_char((_ul>>8) | 0x80); // bit7==1 && bit6==0 -> 2 byte integer
put_char(_ul & 0xFF);
}
else if (_ul <= 0x1FFFFF) {
put_char((_ul>>16) | 0xC0); // bit7==1 && bit6==1 && bit5==0 -> 3 byte integer
put_char((_ul>>8) & 0xFF);
put_char(_ul & 0xFF);
}
else if (_ul <= 0x0FFFFFFF) {
put_char((_ul>>24) | 0xE0); // bit7==1 && bit6==1 && bit5==1 && bit4==0 -> 4 byte integer
put_char((_ul>>16) & 0xFF);
put_char((_ul>>8) & 0xFF);
put_char(_ul & 0xFF);
}
else { // else -> 5 byte integer
put_char(0xF0);
put_char((_ul>>24) & 0xFF);
put_char((_ul>>16) & 0xFF);
put_char((_ul>>8) & 0xFF);
put_char(_ul & 0xFF);
}
}
void PS_FileBuffer::get_ulong(unsigned long int &_ul) {
unsigned char c;
get_char(c);
if ((c & 0x80) == 0) { // 1-byte
_ul = c;
}
else {
if ((c & 0xC0) == 0x80) { // 2-byte
_ul = (unsigned long)(c & 0x3F) << 8;
}
else {
if ((c & 0xE0) == 0xC0) { // 3-byte
_ul = (unsigned long)(c & 0x1F) << 16;
}
else {
if ((c & 0xF0) == 0xE0) { // 4-byte
_ul = (unsigned long)(c & 0x0F) << 24;
}
else {
get_char(c);
_ul = (unsigned long)c << 24;
}
get_char(c);
_ul = (unsigned long)c << 16;
}
get_char(c);
_ul |= (unsigned long)c << 8;
}
get_char(c);
_ul |= c;
}
}
void PS_FileBuffer::peek(void *_data, int _length) {
if (_length > BUFFER_SIZE) {
fprintf(stderr, "sorry, i can't read %i bytes at once, only %i\n", _length, BUFFER_SIZE);
CRASH();
}
if (position + _length <= size) {
memcpy(_data, &buffer[position], _length);
}
else {
refill();
memcpy(_data, buffer, _length);
}
}
void PS_FileBuffer::flush() {
ssize_t written = write(file_handle, buffer, size);
if (written != size) {
fprintf(stderr, "failed to write %i bytes to file %s (total_write = %lu)\n", size, file_name, total_write);
CRASH();
}
total_write += written;
size = 0;
position = 0;
}
void PS_FileBuffer::refill() {
// move unread data to start of buffer
int unread = size-position;
memcpy(buffer, &buffer[position], unread);
// read data from file
ssize_t readen = read(file_handle, &buffer[size-position], BUFFER_SIZE-unread);
if (readen < 1) {
fprintf(stderr, "failed to refill buffer from file %s (total_read = %lu)\n", file_name, total_read);
CRASH();
}
total_read += readen;
size = unread+readen;
position = 0;
}
void PS_FileBuffer::reinit(const char *_name, bool _readonly) {
// finish old file
if (!is_readonly) flush();
if (file_name) free(file_name);
if (file_handle != -1) close(file_handle);
// init. file
file_name = strdup(_name);
is_readonly = _readonly;
if (is_readonly) {
file_flags = O_RDONLY;
file_mode = 0;
}
else {
file_flags = O_WRONLY | O_CREAT | O_EXCL;
file_mode = S_IRUSR | S_IWUSR;
}
file_handle = open(file_name, file_flags, file_mode);
if (file_handle == -1) {
if (_readonly) {
fprintf(stderr, "failed to open file '%s' for reading\n", file_name);
}
else {
fprintf(stderr, "failed to create file '%s' for writing\nmaybe it already exists ?\n", file_name);
}
CRASH();
}
// init. buffer
clear();
// debug
total_read = 0;
total_write = 0;
}
PS_FileBuffer::PS_FileBuffer(const char *_name, bool _readonly)
:
file_name(strdup(_name)),
is_readonly(_readonly),
file_pos(-1)
{
// init. file
if (is_readonly) {
file_flags = O_RDONLY;
file_mode = 0;
}
else {
file_flags = O_WRONLY | O_CREAT | O_EXCL;
file_mode = S_IRUSR | S_IWUSR;
}
file_handle = open(file_name, file_flags, file_mode);
if (file_handle == -1) {
if (_readonly) {
fprintf(stderr, "failed to open file '%s' for reading\n", file_name);
}
else {
fprintf(stderr, "failed to create file '%s' for writing\nmaybe it already exists ?\n", file_name);
}
CRASH();
}
// init. buffer
size = 0;
position = 0;
buffer = (unsigned char *)malloc(BUFFER_SIZE);
if (!buffer) {
fprintf(stderr, "failed to allocate memory for buffer for file %s\n", file_name);
CRASH();
}
// debug
total_read = 0;
total_write = 0;
}
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