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gbfile.cc
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/*
Common GPSBabel file I/O API
Copyright (C) 2006,2007,2008 Olaf Klein, [email protected]
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <QByteArray> // for QByteArray
#include <QChar> // for QChar, operator==, operator!=
#include <QDebug> // for QDebug
#include <QString> // for QString
#include <Qt> // for CaseInsensitive
#include <QtGlobal> // for qPrintable
#include <cassert> // for assert
#include <cctype> // for tolower
#include <cstdarg> // for va_list, va_end, va_copy, va_start
#include <cstdio> // for EOF, ferror, ftell, SEEK_SET, SEEK_CUR, SEEK_END, clearerr, fclose, feof, fflush, fileno, fread, fseek, fwrite, ungetc, vsnprintf, FILE, stdin, stdout
#include <cstring> // for memcpy, strlen, strchr, strcpy, strncat
#include "defs.h"
#include "gbfile.h"
#include "src/core/logging.h"
#if __WIN32__
/* taken from minigzip.c (part of the zlib project) */
# include <fcntl.h>
# include <io.h>
# define SET_BINARY_MODE(file) _setmode(fileno(file), O_BINARY)
#else
# define SET_BINARY_MODE(file)
#endif
#define MYNAME "gbfile"
#define NO_ZLIB MYNAME ": No zlib support.\n"
/* About the ZLIB_INHIBITED stuff:
*
* If a user goes out of his way to build with ZLIB_INHIBITED set,
* we jettison our use of zlib entirely within this file, replacing
* all calls out to zlib with calls to abort() as that's an internal
* consistency error.
*
*/
/*******************************************************************************/
/* %%% file api wrappers %%% */
/*******************************************************************************/
#if !ZLIB_INHIBITED
/*******************************************************************************/
/* %%% Zlib file api %%% */
/*******************************************************************************/
static gbfile*
gzapi_open(gbfile* self, const char* mode)
{
char openmode[32];
self->gzapi = 1;
/* under non-posix systems files MUST be opened in binary mode */
strcpy(openmode, mode);
if (strchr(mode, 'b') == nullptr) {
strncat(openmode, "b", sizeof(openmode) - strlen(openmode) - 1);
}
if (self->is_pipe) {
FILE* fd;
if (self->mode == 'r') {
fd = stdin;
} else {
fd = stdout;
}
SET_BINARY_MODE(fd);
self->handle.gz = gzdopen(fileno(fd), openmode);
} else {
#if __WIN32__
// On Windows, convert to wchar_t[] and use gzopen_w().
self->handle.gz = gzopen_w((const wchar_t*) self->name.utf16(), openmode);
#else
// On other platforms, convert to native locale (UTF-8 or other 8-bit).
self->handle.gz = gzopen(qPrintable(self->name), openmode);
#endif
}
if (self->handle.gz == nullptr) {
fatal("%s: Cannot %s file '%s'!\n",
qPrintable(self->module),
(self->mode == 'r') ? "open" : "create",
qPrintable(self->name));
}
return self;
}
static int
gzapi_close(gbfile* self)
{
return gzclose(self->handle.gz);
}
static int
gzapi_seek(gbfile* self, int32_t offset, int whence)
{
assert(whence != SEEK_END);
if ((whence == SEEK_CUR) && (self->back != -1)) {
offset--;
}
int result = gzseek(self->handle.gz, offset, whence);
self->back = -1;
if (result < 0) {
if (self->is_pipe) {
fatal("%s: This format cannot be used in piped commands!\n", qPrintable(self->module));
}
fatal("%s: online compression not yet supported for this format!", qPrintable(self->module));
}
return 0;
}
static gbsize_t
gzapi_read(void* buf, const gbsize_t size, const gbsize_t members, gbfile* self)
{
int result = 0;
char* target = (char*) buf;
int count = size * members;
if (self->back != -1) {
*target++ = self->back;
count--;
result++;
self->back = -1;
}
result += gzread(self->handle.gz, target, count);
/* Check for an incomplete READ */
if ((members == 1) && (size > 1) && (result > 0) && (result < (int)size)) {
fatal("%s: Unexpected end of file (EOF)!\n", qPrintable(self->module));
}
result /= size;
if ((result < 0) || ((gbsize_t)result < members)) {
int errnum;
const char* errtxt = gzerror(self->handle.gz, &errnum);
/* Workaround for zlib bug: buffer error on empty files */
if ((errnum == Z_BUF_ERROR) && (gztell(self->handle.gz) == 0)) {
return (gbsize_t) 0;
}
if ((errnum != Z_STREAM_END) && (errnum != 0))
fatal("%s: zlib returned error %d ('%s')!\n",
qPrintable(self->module), errnum, errtxt);
}
return (gbsize_t) result;
}
static gbsize_t
gzapi_write(const void* buf, const gbsize_t size, const gbsize_t members, gbfile* self)
{
return gzwrite(self->handle.gz, buf, size * members) / size;
}
static int
gzapi_flush(gbfile* self)
{
return gzflush(self->handle.gz, Z_SYNC_FLUSH);
}
static gbsize_t
gzapi_tell(gbfile* self)
{
gbsize_t result = gztell(self->handle.gz);
if (self->back != -1) {
result--;
}
return result;
}
static int
gzapi_eof(gbfile* self)
{
int res = 0;
if (self->back != -1) {
return res;
}
res = gzeof(self->handle.gz);
if (!res) {
unsigned char test;
int len = gzread(self->handle.gz, &test, 1);
if (len == 1) {
/* No EOF, put the single byte back into stream */
self->back = test;
} else {
/* we are at the end of the file */
if (global_opts.debug_level > 0) {
/* now gzeof() should return 1 */
if (!gzeof(self->handle.gz)) {
fatal("zlib gzeof error!\n");
}
}
res = 1;
}
}
return res;
}
static int
gzapi_ungetc(const int c, gbfile* self)
{
if (self->back == -1) {
self->back = c;
} else {
fatal(MYNAME ": Cannot store more than one byte back!\n");
}
return c;
}
static void
gzapi_clearerr(gbfile* self)
{
gzclearerr(self->handle.gz);
}
static int
gzapi_error(gbfile* self)
{
int errnum;
(void)gzerror(self->handle.gz, &errnum);
return errnum;
}
#endif // #if !ZLIB_INHIBITED
/*******************************************************************************/
/* %%% Standard C file api %%% */
/*******************************************************************************/
static gbfile*
stdapi_open(gbfile* self, const char* mode)
{
self->handle.std = xfopen(self->name, mode, self->module);
return self;
}
static int
stdapi_close(gbfile* self)
{
return fclose(self->handle.std);
}
static int
stdapi_seek(gbfile* self, int32_t offset, int whence)
{
gbsize_t pos = 0;
if (whence != SEEK_SET) {
pos = ftell(self->handle.std);
}
int result = fseek(self->handle.std, offset, whence);
if (result != 0) {
switch (whence) {
case SEEK_CUR:
case SEEK_END:
pos = pos + offset;
break;
case SEEK_SET:
pos = offset;
break;
default:
fatal("%s: Unknown seek operation (%d) for file %s!\n",
qPrintable(self->module), whence, qPrintable(self->name));
}
fatal("%s: Unable to set file (%s) to position (%llu)!\n",
qPrintable(self->module), qPrintable(self->name), (long long unsigned) pos);
}
return 0;
}
static gbsize_t
stdapi_read(void* buf, const gbsize_t size, const gbsize_t members, gbfile* self)
{
int error_number;
gbsize_t result = fread(buf, size, members, self->handle.std);
if ((result < members) && (error_number = ferror(self->handle.std))) {
fatal("%s: Error %d occurred during read of file '%s'!\n",
qPrintable(self->module), error_number, qPrintable(self->name));
}
return result;
}
static gbsize_t
stdapi_write(const void* buf, const gbsize_t size, const gbsize_t members, gbfile* self)
{
return fwrite(buf, size, members, self->handle.std);
}
static int
stdapi_flush(gbfile* self)
{
return fflush(self->handle.std);
}
static gbsize_t
stdapi_tell(gbfile* self)
{
return ftell(self->handle.std);
}
static int
stdapi_eof(gbfile* self)
{
return feof(self->handle.std);
}
static int
stdapi_ungetc(const int c, gbfile* self)
{
return ungetc(c, self->handle.std);
}
static void
stdapi_clearerr(gbfile* self)
{
clearerr(self->handle.std);
}
static int
stdapi_error(gbfile* self)
{
return ferror(self->handle.std);
}
/*******************************************************************************/
/* %%% Memory stream (memapi) %%% */
/*******************************************************************************/
static gbfile*
memapi_open(gbfile* self, const char* mode)
{
(void)mode;
self->mempos = 0;
self->memsz = 0;
self->handle.mem = nullptr;
return self;
}
static int
memapi_close(gbfile* self)
{
if (self->handle.mem) {
xfree(self->handle.mem);
}
return 0;
}
static int
memapi_seek(gbfile* self, int32_t offset, int whence)
{
long long pos = (int)self->mempos;
switch (whence) {
case SEEK_CUR:
case SEEK_END:
pos = pos + offset;
break;
case SEEK_SET:
pos = offset;
break;
}
if ((pos < 0) || (pos > self->memlen)) {
return -1;
}
self->mempos = pos;
return 0;
}
static gbsize_t
memapi_read(void* buf, const gbsize_t size, const gbsize_t members, gbfile* self)
{
gbsize_t result = (self->memlen - self->mempos) / size;
if (result > members) {
result = members;
}
gbsize_t count = result * size;
if (count) {
memcpy(buf, self->handle.mem + self->mempos, count);
self->mempos += count;
}
return result;
}
static gbsize_t
memapi_write(const void* buf, const gbsize_t size, const gbsize_t members, gbfile* self)
{
if ((size == 0) && (members == 0)) { /* truncate stream */
self->memlen = self->mempos;
return 0;
}
gbsize_t count = size * members;
if (self->mempos + count > self->memsz) {
self->memsz = ((self->mempos + count + 4095) / 4096) * 4096;
self->handle.mem = (unsigned char*) xrealloc(self->handle.mem, self->memsz);
}
memcpy(self->handle.mem + self->mempos, buf, count);
self->mempos += count;
if (self->mempos > self->memlen) {
self->memlen = self->mempos;
}
return members;
}
static int
memapi_flush(gbfile* self)
{
(void)self;
return 0;
}
static gbsize_t
memapi_tell(gbfile* self)
{
return self->mempos;
}
static int
memapi_eof(gbfile* self)
{
return (self->mempos == self->memlen);
}
static int
memapi_ungetc(const int c, gbfile* self)
{
if (self->mempos == 0) {
return EOF;
} else {
self->mempos--;
self->handle.mem[self->mempos] = (unsigned char) c;
return c;
}
}
static void
memapi_clearerr(gbfile* self)
{
(void)self;
}
static int
memapi_error(gbfile* self)
{
(void)self;
return 0;
}
/* GPSBabel 'file' standard calls */
/*
* gbfopen: (as xfopen) plus the name of the calling GPSBabel module (MYNAME)
*/
gbfile*
gbfopen(const QString& filename, const char* mode, const QString& module)
{
auto* file = new gbfile;
file->module = module;
file->mode = 'r'; // default
file->binary = (strchr(mode, 'b') != nullptr);
file->back = -1;
file->memapi = filename.isNull();
for (const char* m = mode; *m; m++) {
switch (tolower(*m)) {
case 'r':
file->mode = 'r';
#if !ZLIB_INHIBITED
file->gzapi = 1; /* native or transparent */
#endif
break;
case 'w':
file->mode = 'w';
break;
}
}
if (file->memapi) {
file->gzapi = 0;
file->name = "(Memory stream)";
file->fileclearerr = memapi_clearerr;
file->fileclose = memapi_close;
file->fileeof = memapi_eof;
file->fileerror = memapi_error;
file->fileflush = memapi_flush;
file->fileopen = memapi_open;
file->fileread = memapi_read;
file->fileseek = memapi_seek;
file->filetell = memapi_tell;
file->fileungetc = memapi_ungetc;
file->filewrite = memapi_write;
} else {
file->name = filename;
file->is_pipe = (filename == '-');
/* Do we have a '.gz' extension in the filename ? */
if ((file->name.size() > 3) && (file->name.endsWith(".gz", Qt::CaseInsensitive))) {
#if !ZLIB_INHIBITED
/* force gzipped files on output */
file->gzapi = 1;
#else
fatal(NO_ZLIB);
#endif
}
if (file->gzapi) {
#if !ZLIB_INHIBITED
file->fileclearerr = gzapi_clearerr;
file->fileclose = gzapi_close;
file->fileeof = gzapi_eof;
file->fileerror = gzapi_error;
file->fileflush = gzapi_flush;
file->fileopen = gzapi_open;
file->fileread = gzapi_read;
file->fileseek = gzapi_seek;
file->filetell = gzapi_tell;
file->fileungetc = gzapi_ungetc;
file->filewrite = gzapi_write;
#else
/* This is the only runtime test we make */
fatal("%s: Zlib was not included in this build.\n", qPrintable(file->module));
#endif
} else {
file->fileclearerr = stdapi_clearerr;
file->fileclose = stdapi_close;
file->fileeof = stdapi_eof;
file->fileerror = stdapi_error;
file->fileflush = stdapi_flush;
file->fileopen = stdapi_open;
file->fileread = stdapi_read;
file->fileseek = stdapi_seek;
file->filetell = stdapi_tell;
file->fileungetc = stdapi_ungetc;
file->filewrite = stdapi_write;
}
}
file->fileopen(file, mode);
file->buffsz = 256;
file->buff = (char*) xmalloc(file->buffsz);
return file;
}
/*
* gbfopen_be: as gbfopen, but set the BIG-ENDIAN flag
*/
gbfile*
gbfopen_be(const QString& filename, const char* mode, const QString& module)
{
gbfile* result = gbfopen(filename, mode, module);
result->big_endian = 1;
return result;
}
/*
* gbfclose: (as fclose)
*/
void
gbfclose(gbfile* file)
{
if (!file) {
return;
}
file->fileclose(file);
xfree(file->buff);
delete file;
}
/*
* gbfgetc: (as fgetc)
*/
int
gbfgetc(gbfile* file)
{
unsigned char c;
/* errors are caught in gbfread */
if (gbfread(&c, 1, 1, file) == 0) {
return EOF;
} else {
return (unsigned int)c;
}
}
/*
* gbfgets: (as fgets)
*/
QString
gbfgets(char* buf, int len, gbfile* file)
{
char* result = buf;
while (--len > 0) {
int c = gbfgetc(file);
if (c == EOF) {
break;
}
*(unsigned char*)buf = (unsigned char)c;
buf++;
if (c == '\r') {
c = gbfgetc(file);
if ((c != '\n') && (c != EOF)) {
gbfungetc(c, file);
}
break;
} else if (c == '\n') {
break;
}
}
*buf = '\0';
QString rv(result);
return rv;
}
/*
* gbfread: (as fread)
*/
gbsize_t
gbfread(void* buf, const gbsize_t size, const gbsize_t members, gbfile* file)
{
if ((size == 0) || (members == 0)) {
return 0;
}
return file->fileread(buf, size, members, file);
}
// This probably makes an unnecessary alloc/copy, but keeps the above (kinda
// goofy) calling signature.
gbsize_t
gbfread(QString& buf, const gbsize_t size,
const gbsize_t members, gbfile* file)
{
QByteArray tmp;
tmp.resize(members * size);
gbsize_t retval = gbfread(tmp.data(), size, members, file);
buf = QString(tmp);
return retval;
}
QByteArray gbfreadbuf(gbsize_t size, gbfile* file) {
QByteArray tmp;
tmp.resize(size);
gbsize_t nbytes = gbfread(tmp.data(), 1, size, file);
if (nbytes != size) {
fatal(FatalMsg() << file->module << "Attempted to read " << size <<
"bytes, but only " << nbytes << "were available.");
}
return tmp;
}
/*
* gbvfprintf: (as vfprintf)
*/
int gbvfprintf(gbfile* file, const char* format, va_list ap)
{
int len;
for (;;) {
va_list args;
va_copy(args, ap);
len = vsnprintf(file->buff, file->buffsz, format, args);
va_end(args);
/* Unambiguous Success */
if ((len > -1) && (len < file->buffsz)) {
break;
}
/* First case: C99 behaviour. Len is correctly sized.
* add space for null terminator. Next time through the
* loop we're guaranteed success.
*
* Second case: SUS (and Windows) behaviour. We know it
* doesn't fit, but we don't know how big it has to be.
` * double it and try again. We'll loop until we succeed.
*
* Since we keep the I/O buffer in the file handle, we
* quickly reach a steady state on the size of these buffers.
*/
if (len > -1) {
file->buffsz = len + 1;
} else {
file->buffsz *= 2;
}
file->buff = (char*) xrealloc(file->buff, file->buffsz);
}
return gbfwrite(file->buff, 1, len, file);
}
/*
* gbfprintf: (as fprintf)
*/
int
gbfprintf(gbfile* file, const char* format, ...)
{
va_list args;
va_start(args, format);
int result = gbvfprintf(file, format, args);
va_end(args);
return result;
}
/*
* gbfputc: (as fputc)
*/
int
gbfputc(int c, gbfile* file)
{
unsigned char temp = (unsigned int) c;
gbfwrite(&temp, 1, 1, file);
return c;
}
/*
* gbfputs: (as fputs)
*/
// This is a depressing hack, meant to ease the pain from C strings
// to QStrings, which are consistently encoded.
int
gbfputs(const QString& s, gbfile* file)
{
QByteArray qs = s.toUtf8();
int rv = gbfwrite(qs.constData(), 1, qs.size(), file);
return rv;
}
/*
* gbfwrite: (as fwrite)
*/
int
gbfwrite(const void* buf, const gbsize_t size, const gbsize_t members, gbfile* file)
{
unsigned int result = file->filewrite(buf, size, members, file);
if (result != members) {
fatal("%s: Could not write %lld bytes to %s (result %d)!\n",
qPrintable(file->module),
(long long int)(members - result) * size,
qPrintable(file->name),
result);
}
return result;
}
/*
* gbfflush: (as fflush)
*/
int
gbfflush(gbfile* file)
{
return file->fileflush(file);
}
/*
* gbfclearerr: (as clearerr)
*/
void
gbfclearerr(gbfile* file)
{
file->fileclearerr(file);
}
/*
* gbferror: (as ferror)
*/
int
gbferror(gbfile* file)
{
return file->fileerror(file);
}
/*
* gbfrewind: (as frewind)
*/
void
gbfrewind(gbfile* file)
{
(void) gbfseek(file, 0, SEEK_SET);
gbfclearerr(file);
}
/*
* gbfseek: (as fseek)
*/
int
gbfseek(gbfile* file, int32_t offset, int whence)
{
return file->fileseek(file, offset, whence);
}
/*
* gbftell: (as ftell)
*/
gbsize_t
gbftell(gbfile* file)
{
gbsize_t result = file->filetell(file);
if ((signed) result == -1)
fatal("%s: Could not determine position of file '%s'!\n",
qPrintable(file->module), qPrintable(file->name));
return result;
}
/*
* gbfeof: (as feof)
*/
int
gbfeof(gbfile* file)
{
return file->fileeof(file);
}
/*
* gbfungetc: (as fungetc)
*/
int
gbfungetc(const int c, gbfile* file)
{
return file->fileungetc(c, file);
}
/* GPSBabel 'file' enhancements */
/*
* gbfgetint32: read a signed 32-bit integer from input stream
*/
int32_t
gbfgetint32(gbfile* file)
{
char buf[4];
if (gbfread(&buf, 1, sizeof(buf), file) != sizeof(buf)) {
fatal("%s: Unexpected end of file (%s)!\n", qPrintable(file->module), qPrintable(file->name));
}
if (file->big_endian) {
return be_read32(buf);
} else {
return le_read32(buf);
}
}
/*
* gbfgetint16: read a signed 16-bit integer from input stream
*/
int16_t
gbfgetint16(gbfile* file)
{
char buf[2];
if (gbfread(&buf, 1, sizeof(buf), file) != sizeof(buf)) {
fatal("%s: Unexpected end of file (%s)!\n", qPrintable(file->module), qPrintable(file->name));
}
if (file->big_endian) {
return be_read16(buf);
} else {
return le_read16(buf);
}
}
/*
* gbfgetdbl: read a double value (8 byte, double precision) from input stream
*/
double
gbfgetdbl(gbfile* file)
{
char buf[8];
if (gbfread(&buf, 1, sizeof(buf), file) != sizeof(buf)) {
fatal("%s: Unexpected end of file (%s)!\n", qPrintable(file->module), qPrintable(file->name));
}
return endian_read_double(buf, ! file->big_endian);
}
/*
* gbfgetflt: read a float value (4 byte, single precision) from input stream
*/
float
gbfgetflt(gbfile* file)
{
char buf[4];
if (gbfread(&buf, 1, sizeof(buf), file) != sizeof(buf)) {
fatal("%s: Unexpected end of file (%s)!\n", qPrintable(file->module), qPrintable(file->name));
}
return endian_read_float(buf, ! file->big_endian);
}
/*
* gbfgetcstr: Reads a string from file until either a '\0' or eof.
* The result is a temporary allocated entity: use it or free it!
*/
char*
gbfgetcstr_old(gbfile* file)
{
int len = 0;
char* str = file->buff;
for (;;) {
int c = gbfgetc(file);
if (c == 0) {
break;
}