160 lines
3.4 KiB
C
160 lines
3.4 KiB
C
#include <zipfile/zipfile.h>
|
|
|
|
#include "private.h"
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <zlib.h>
|
|
#define DEF_MEM_LEVEL 8 // normally in zutil.h?
|
|
|
|
zipfile_t
|
|
init_zipfile(const void* data, size_t size)
|
|
{
|
|
int err;
|
|
|
|
Zipfile *file = malloc(sizeof(Zipfile));
|
|
if (file == NULL) return NULL;
|
|
memset(file, 0, sizeof(Zipfile));
|
|
file->buf = data;
|
|
file->bufsize = size;
|
|
|
|
err = read_central_dir(file);
|
|
if (err != 0) goto fail;
|
|
|
|
return file;
|
|
fail:
|
|
free(file);
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
release_zipfile(zipfile_t f)
|
|
{
|
|
Zipfile* file = (Zipfile*)f;
|
|
Zipentry* entry = file->entries;
|
|
while (entry) {
|
|
Zipentry* next = entry->next;
|
|
free(entry);
|
|
entry = next;
|
|
}
|
|
free(file);
|
|
}
|
|
|
|
zipentry_t
|
|
lookup_zipentry(zipfile_t f, const char* entryName)
|
|
{
|
|
Zipfile* file = (Zipfile*)f;
|
|
Zipentry* entry = file->entries;
|
|
while (entry) {
|
|
if (0 == memcmp(entryName, entry->fileName, entry->fileNameLength)) {
|
|
return entry;
|
|
}
|
|
entry = entry->next;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
size_t
|
|
get_zipentry_size(zipentry_t entry)
|
|
{
|
|
return ((Zipentry*)entry)->uncompressedSize;
|
|
}
|
|
|
|
char*
|
|
get_zipentry_name(zipentry_t entry)
|
|
{
|
|
Zipentry* e = (Zipentry*)entry;
|
|
int l = e->fileNameLength;
|
|
char* s = malloc(l+1);
|
|
memcpy(s, e->fileName, l);
|
|
s[l] = '\0';
|
|
return s;
|
|
}
|
|
|
|
enum {
|
|
STORED = 0,
|
|
DEFLATED = 8
|
|
};
|
|
|
|
static int
|
|
uninflate(unsigned char* out, int unlen, const unsigned char* in, int clen)
|
|
{
|
|
z_stream zstream;
|
|
int err = 0;
|
|
int zerr;
|
|
|
|
memset(&zstream, 0, sizeof(zstream));
|
|
zstream.zalloc = Z_NULL;
|
|
zstream.zfree = Z_NULL;
|
|
zstream.opaque = Z_NULL;
|
|
zstream.next_in = (void*)in;
|
|
zstream.avail_in = clen;
|
|
zstream.next_out = (Bytef*) out;
|
|
zstream.avail_out = unlen;
|
|
zstream.data_type = Z_UNKNOWN;
|
|
|
|
// Use the undocumented "negative window bits" feature to tell zlib
|
|
// that there's no zlib header waiting for it.
|
|
zerr = inflateInit2(&zstream, -MAX_WBITS);
|
|
if (zerr != Z_OK) {
|
|
return -1;
|
|
}
|
|
|
|
// uncompress the data
|
|
zerr = inflate(&zstream, Z_FINISH);
|
|
if (zerr != Z_STREAM_END) {
|
|
fprintf(stderr, "zerr=%d Z_STREAM_END=%d total_out=%lu\n", zerr, Z_STREAM_END,
|
|
zstream.total_out);
|
|
err = -1;
|
|
}
|
|
|
|
inflateEnd(&zstream);
|
|
return err;
|
|
}
|
|
|
|
int
|
|
decompress_zipentry(zipentry_t e, void* buf, int bufsize)
|
|
{
|
|
Zipentry* entry = (Zipentry*)e;
|
|
switch (entry->compressionMethod)
|
|
{
|
|
case STORED:
|
|
memcpy(buf, entry->data, entry->uncompressedSize);
|
|
return 0;
|
|
case DEFLATED:
|
|
return uninflate(buf, bufsize, entry->data, entry->compressedSize);
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
void
|
|
dump_zipfile(FILE* to, zipfile_t file)
|
|
{
|
|
Zipfile* zip = (Zipfile*)file;
|
|
Zipentry* entry = zip->entries;
|
|
int i;
|
|
|
|
fprintf(to, "entryCount=%d\n", zip->entryCount);
|
|
for (i=0; i<zip->entryCount; i++) {
|
|
fprintf(to, " file \"");
|
|
fwrite(entry->fileName, entry->fileNameLength, 1, to);
|
|
fprintf(to, "\"\n");
|
|
entry = entry->next;
|
|
}
|
|
}
|
|
|
|
zipentry_t
|
|
iterate_zipfile(zipfile_t file, void** cookie)
|
|
{
|
|
Zipentry* entry = (Zipentry*)*cookie;
|
|
if (entry == NULL) {
|
|
Zipfile* zip = (Zipfile*)file;
|
|
*cookie = zip->entries;
|
|
return *cookie;
|
|
} else {
|
|
entry = entry->next;
|
|
*cookie = entry;
|
|
return entry;
|
|
}
|
|
}
|