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First checkin of zip file iterator and extractor

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This commit is contained in:
Timo Strunk 2014-09-10 00:22:51 +02:00
parent 674a8b5f33
commit 936705ca42
1 changed files with 185 additions and 1 deletions
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186
decompress/zip_support.c
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@ -24,14 +24,198 @@
#include "../file_path.h"
#include "zip_support.h"
//ZLIB minizip implementation
#include "../deps/rzlib/unzip.h"
// Extract the relative path relative_path from a zip archive archive_path and allocate a buf for it to write it in.
/* Extract the relative path relative_path from a zip archive archive_path and allocate a buf for it to write it in. */
/* This code is inspired by:
* http://stackoverflow.com/questions/10440113/simple-way-to-unzip-a-zip-file-using-zlib
*/
int read_zip_file(const char * archive_path, const char *relative_path, void **buf)
{
size_t bytes_read = -1;
bool finished_reading = false;
unzFile *zipfile = unzOpen( archive_path );
if ( ! zipfile )
{
RARCH_ERR("Could not open zipfile %s.\n",archive_path);
return -1;
}
// Get info about the zip file
unz_global_info global_info;
if ( unzGetGlobalInfo( zipfile, &global_info ) != UNZ_OK )
{
RARCH_ERR("Could not get global zipfile info of %s."
"Could be only a gzip file without the zip part.\n",archive_path);
unzClose( zipfile );
return -1;
}
// Loop to extract all files
uLong i;
for ( i = 0; i < global_info.number_entry; ++i )
{
// Get info about current file.
unz_file_info file_info;
char filename[ PATH_MAX ];
if ( unzGetCurrentFileInfo(
zipfile,
&file_info,
filename,
PATH_MAX,
NULL, 0, NULL, 0 ) != UNZ_OK )
{
RARCH_ERR("Could not read file info in zip %s.\n",archive_path);
unzClose( zipfile );
return -1;
}
// Check if this entry is a directory or file.
char last_char = ' ';
last_char = filename[strlen(filename)-1];
if ( last_char == '/' || last_char == '\\' )
{
//We skip directories
}
else if (strcmp(filename,relative_path) == 0)
{
/* We found the correct file in the zip, now extract it to *buf */
if ( unzOpenCurrentFile( zipfile ) != UNZ_OK )
{
RARCH_ERR("The file %s in %s could not be read.\n",relative_path,archive_path);
unzClose( zipfile );
return -1;
}
/* Allocate outbuffer */
*buf = malloc(file_info.uncompressed_size + 1 );
bytes_read = unzReadCurrentFile( zipfile, *buf, file_info.uncompressed_size );
if (bytes_read != file_info.uncompressed_size)
{
RARCH_ERR("We tried to read %d bytes, but only got %d of file %s in zip %s.\n",
(unsigned int) file_info.uncompressed_size,(int)bytes_read,relative_path,archive_path);
free(*buf);
unzCloseCurrentFile( zipfile );
unzClose( zipfile );
return -1;
}
((char*)(*buf))[file_info.uncompressed_size] = '\0';
finished_reading = true;
}
unzCloseCurrentFile( zipfile );
if (finished_reading)
break;
if ( ( i+1 ) < global_info.number_entry )
{
if ( unzGoToNextFile( zipfile ) != UNZ_OK )
{
RARCH_ERR( "Could not iterate to next file in %s. Zipfile might be corrupt.\n",archive_path );
unzClose( zipfile );
return -1;
}
}
}
unzClose( zipfile );
return bytes_read;
}
struct string_list *compressed_zip_file_list_new(const char *path,
const char* ext)
{
struct string_list *ext_list = NULL;
struct string_list *list = (struct string_list*)string_list_new();
if (!list)
{
RARCH_ERR("Could not allocate list memory in compressed_7zip_file_list_new\n.");
return NULL;
}
if (ext)
ext_list = string_split(ext, "|");
size_t bytes_read = -1;
bool finished_reading = false;
unzFile *zipfile = unzOpen( path );
if ( ! zipfile )
{
RARCH_ERR("Could not open zipfile %s.\n",path);
return NULL;
}
// Get info about the zip file
unz_global_info global_info;
if ( unzGetGlobalInfo( zipfile, &global_info ) != UNZ_OK )
{
RARCH_ERR("Could not get global zipfile info of %s."
"Could be only a gzip file without the zip part.\n",path);
unzClose( zipfile );
return NULL;
}
// Loop to extract all files
uLong i;
for ( i = 0; i < global_info.number_entry; ++i )
{
// Get info about current file.
unz_file_info file_info;
char filename[ PATH_MAX ];
if ( unzGetCurrentFileInfo(
zipfile,
&file_info,
filename,
PATH_MAX,
NULL, 0, NULL, 0 ) != UNZ_OK )
{
RARCH_ERR("Could not read file info in zip %s.\n",path);
unzClose( zipfile );
return NULL;
}
// Check if this entry is a directory or file.
char last_char = ' ';
last_char = filename[strlen(filename)-1];
if ( last_char == '/' || last_char == '\\' )
{
//We skip directories
}
else
{
const char *file_ext = path_get_extension(filename);
bool supported_by_core = false;
union string_list_elem_attr attr;
if (string_list_find_elem_prefix(ext_list, ".", file_ext))
supported_by_core = true;
if (supported_by_core)
{
attr.i = RARCH_COMPRESSED_FILE_IN_ARCHIVE;
if (!string_list_append(list, filename, attr))
{
RARCH_ERR("Could not append item to stringlist in zip_support.\n");
unzCloseCurrentFile( zipfile );
break;
}
}
}
unzCloseCurrentFile( zipfile );
if ( ( i+1 ) < global_info.number_entry )
{
if ( unzGoToNextFile( zipfile ) != UNZ_OK )
{
RARCH_ERR( "Could not iterate to next file in %s. Zipfile might be corrupt.\n",path );
unzClose( zipfile );
return NULL;
}
}
}
unzClose( zipfile );
return list;
}