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#include <magic.h>
#include <lzma.h>
#include <zlib.h>
#define kBufferSize (1 << 15)
typedef struct lzma_file {
uint8_t buf[kBufferSize];
lzma_stream strm;
FILE *fp;
lzma_bool eof;
} lzma_FILE;
typedef enum xFile_e {
XF_ASCII,
XF_GZIP,
XF_LZMA,
XF_XZ,
XF_FAIL
} xFile_t;
typedef struct xFile_s {
xFile_t type;
lzma_bool eof;
union {
gzFile gz;
lzma_FILE *xz;
} f;
FILE *fp;
} xFile;
static lzma_FILE *lzma_open(lzma_ret *lzma_error, FILE *fp, uint64_t memlimit)
{
lzma_ret *ret = lzma_error;
lzma_FILE *lzma_file;
lzma_stream tmp = LZMA_STREAM_INIT;
lzma_file = calloc(1, sizeof(*lzma_file));
lzma_file->fp = fp;
lzma_file->eof = 0;
lzma_file->strm = tmp;
*ret = lzma_auto_decoder(&lzma_file->strm, memlimit, 0);
if (*ret != LZMA_OK) {
(void) fclose(lzma_file->fp);
free(lzma_file);
return NULL;
}
return lzma_file;
}
static ssize_t lzma_read(lzma_ret *lzma_error, lzma_FILE *lzma_file, void *buf, size_t len)
{
lzma_ret *ret = lzma_error;
lzma_bool eof = 0;
if (!lzma_file)
return -1;
if (lzma_file->eof)
return 0;
lzma_file->strm.next_out = buf;
lzma_file->strm.avail_out = len;
for (;;) {
if (!lzma_file->strm.avail_in) {
lzma_file->strm.next_in = (uint8_t *)lzma_file->buf;
lzma_file->strm.avail_in = fread(lzma_file->buf, 1, kBufferSize, lzma_file->fp);
if (!lzma_file->strm.avail_in)
eof = 1;
}
*ret = lzma_code(&lzma_file->strm, LZMA_RUN);
if (*ret == LZMA_STREAM_END) {
lzma_file->eof = 1;
return len - lzma_file->strm.avail_out;
}
if (*ret != LZMA_OK)
return -1;
if (!lzma_file->strm.avail_out)
return len;
if (eof)
return -1;
}
}
static xFile xOpen(const char *path) {
xFile xF = {XF_FAIL, 0, {NULL}, NULL};
lzma_ret ret = LZMA_OK;
const char *message, *tmp;
magic_t cookie;
if ((cookie = magic_open(MAGIC_NONE)) && !magic_load(cookie, NULL)) {
message = magic_file(cookie, path);
if(message == NULL)
xF.type = XF_FAIL;
else if(strstr(message, "gzip compressed"))
xF.type = XF_GZIP;
else if(strstr(message, "xz compressed"))
xF.type = XF_XZ;
else if(strstr(message, "LZMA compressed"))
xF.type = XF_LZMA;
else if(strstr(message, "ASCII"))
xF.type = XF_ASCII;
magic_close(cookie);
}
if(xF.type == XF_FAIL && (tmp = rindex(path, '.'))) {
if(!strcmp(tmp, ".cz") || !strcmp(tmp, ".cz"))
xF.type = XF_GZIP;
else if(!strcmp(tmp, ".xz"))
xF.type = XF_XZ;
else if(!strcmp(tmp, ".lzma"))
xF.type = XF_LZMA;
}
switch(xF.type) {
case XF_GZIP:
xF.f.gz = gzopen(path, "rb");
if(xF.f.gz == NULL)
xF.type = XF_FAIL;
break;
case XF_ASCII:
case XF_LZMA:
case XF_XZ:
xF.fp = fopen(path, "rb");
if(xF.fp == NULL)
xF.type = XF_FAIL;
if(xF.type == XF_ASCII || xF.type == XF_FAIL) break;
xF.f.xz = lzma_open(&ret, xF.fp, -1);
if(ret != LZMA_OK)
xF.type = XF_FAIL;
break;
default:
break;
}
return xF;
}
static int xClose(xFile *xF) {
int ret = -1;
switch(xF->type) {
case XF_GZIP:
ret = gzclose(xF->f.gz);
break;
case XF_LZMA:
case XF_XZ:
lzma_end(&xF->f.xz->strm);
free(xF->f.xz);
case XF_ASCII:
ret = fclose(xF->fp);
break;
default:
break;
}
return ret;
}
static ssize_t xRead(xFile *xF, lzma_ret *ret, void *buf, size_t len) {
ssize_t sz;
switch(xF->type) {
case XF_GZIP:
sz = gzread(xF->f.gz, buf, len);
xF->eof = gzeof(xF->f.gz);
break;
case XF_LZMA:
case XF_XZ:
sz = lzma_read(ret, xF->f.xz, buf, len);
xF->eof = xF->f.xz->eof;
break;
case XF_ASCII:
sz = fread(buf, 1, len, xF->fp);
xF->eof = feof(xF->fp);
break;
default:
break;
}
return sz;
}
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