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COMMON: Add caching to ZipArchive. Patch #3048388

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Based on patch #3048388: "Hash map for ZipArchive class", though
I made the hashing by default and removed the old code.

It is a really good thing and will speed up any archive operations.

svn-id: r52204
This commit is contained in:
Eugene Sandulenko 2010-08-19 10:15:12 +00:00
parent d8d8857276
commit 2bd5077d2e
1 changed files with 47 additions and 25 deletions
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70
common/unzip.cpp
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@ -107,6 +107,9 @@ typedef struct {
#include "common/unzip.h"
#include "common/file.h"
#include "common/hashmap.h"
#include "common/hash-str.h"
#if defined(STRICTUNZIP) || defined(STRICTZIPUNZIP)
/* like the STRICT of WIN32, we define a pointer that cannot be converted
from (void*) without cast */
@ -362,6 +365,16 @@ typedef struct {
uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/
} file_in_zip_read_info_s;
typedef struct {
uLong num_file; /* number of the current file in the zipfile*/
uLong pos_in_central_dir; /* pos of the current file in the central dir*/
uLong current_file_ok; /* flag about the usability of the current file*/
unz_file_info cur_file_info; /* public info about the current file in zip*/
unz_file_info_internal cur_file_info_internal; /* private info about it*/
} cached_file_in_zip;
typedef Common::HashMap<Common::String, cached_file_in_zip, Common::IgnoreCase_Hash,
Common::IgnoreCase_EqualTo> ZipHash;
/* unz_s contain internal information about the zipfile
*/
@ -382,6 +395,7 @@ typedef struct {
unz_file_info_internal cur_file_info_internal; /* private info about it*/
file_in_zip_read_info_s* pfile_in_zip_read; /* structure about the current
file if we are decompressing it */
ZipHash _hash;
} unz_s;
/* ===========================================================================
@ -589,7 +603,27 @@ unzFile unzOpen(Common::SeekableReadStream *stream) {
us->central_pos = central_pos;
us->pfile_in_zip_read = NULL;
unzGoToFirstFile((unzFile)us);
err = unzGoToFirstFile((unzFile)us);
while (err == UNZ_OK) {
// Get the file details
char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
unzGetCurrentFileInfo(us, NULL, szCurrentFileName, sizeof(szCurrentFileName) - 1,
NULL, 0, NULL, 0);
// Save details into the hash
cached_file_in_zip fe;
fe.num_file = us->num_file;
fe.pos_in_central_dir = us->pos_in_central_dir;
fe.current_file_ok = us->current_file_ok;
fe.cur_file_info = us->cur_file_info;
fe.cur_file_info_internal = us->cur_file_info_internal;
us->_hash[Common::String(szCurrentFileName)] = fe;
// Move to the next file
err = unzGoToNextFile((unzFile)us);
}
return (unzFile)us;
}
@ -870,7 +904,6 @@ int unzGoToNextFile(unzFile file) {
return err;
}
/*
Try locate the file szFileName in the zipfile.
For the iCaseSensitivity signification, see unzipStringFileNameCompare
@ -881,12 +914,6 @@ int unzGoToNextFile(unzFile file) {
*/
int unzLocateFile(unzFile file, const char *szFileName, int iCaseSensitivity) {
unz_s* s;
int err;
uLong num_fileSaved;
uLong pos_in_central_dirSaved;
if (file==NULL)
return UNZ_PARAMERROR;
@ -898,25 +925,20 @@ int unzLocateFile(unzFile file, const char *szFileName, int iCaseSensitivity) {
if (!s->current_file_ok)
return UNZ_END_OF_LIST_OF_FILE;
num_fileSaved = s->num_file;
pos_in_central_dirSaved = s->pos_in_central_dir;
// Check to see if the entry exists
ZipHash::iterator i = s->_hash.find(Common::String(szFileName));
if (i == s->_hash.end())
return UNZ_END_OF_LIST_OF_FILE;
err = unzGoToFirstFile(file);
// Found it, so reset the details in the main structure
cached_file_in_zip &fe = i->_value;
s->num_file = fe.num_file;
s->pos_in_central_dir = fe.pos_in_central_dir;
s->current_file_ok = fe.current_file_ok;
s->cur_file_info = fe.cur_file_info;
s->cur_file_info_internal = fe.cur_file_info_internal;
while (err == UNZ_OK) {
char szCurrentFileName[UNZ_MAXFILENAMEINZIP+1];
unzGetCurrentFileInfo(file,NULL,
szCurrentFileName,sizeof(szCurrentFileName)-1,
NULL,0,NULL,0);
if (unzStringFileNameCompare(szCurrentFileName,
szFileName,iCaseSensitivity)==0)
return UNZ_OK;
err = unzGoToNextFile(file);
}
s->num_file = num_fileSaved ;
s->pos_in_central_dir = pos_in_central_dirSaved ;
return err;
}