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#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;
unsigned long crc;
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;
}
}
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