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Beginning of refactoring

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This commit is contained in:
TriantaTV
2022-11-10 18:30:35 -06:00
parent 62a18af402
commit 4e20f39ecd
4 changed files with 158 additions and 71 deletions
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src/stuffy.c
+116 -55
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@@ -6,22 +6,61 @@
#include <sys/types.h>
#include "stuffy.h"
// Put a module header into a HeaderStruct and read (skip) module data
// Returns size of data read when reading a module header
int ReadSingleModule(int fd, ModuleStruct* module)
{
int readSize;
long long int moduleSize;
readSize = read(fd, &(module->moduleHeader), sizeof(HeaderStruct));
moduleSize = (long long) module->moduleHeader.moduleInfo.st_size;
module->moduleData = malloc(moduleSize);
read(fd, &module->moduleData, moduleSize);
return readSize;
}
// Checks if operation went ok, if not then prints message and exits
void SafetyCheck(int status, char* message)
{
if (status)
{
fprintf(stderr, "%s\n", message);
exit(1);
}
return;
}
// Strip path from filename for adding to archive
char* StripFilename(char* filename)
{
int nameStartPosition = -1;
for (int i = 0; i < strlen(filename); i++)
if (filename[i] == '/')
nameStartPosition = i+1;
if (nameStartPosition == -1)
nameStartPosition = 0;
int copySize = strlen(filename) - nameStartPosition;
char* newFilename = malloc(copySize + 1);
strncpy(newFilename, &filename[nameStartPosition], copySize);
strcat(newFilename, "\0");
return newFilename;
}
// Overhead function for archive operations
void Stuffy(int argc, char* argv[])
{
// Check for argument
int archiveAction = StuffyArgument(argc, argv);
if (archiveAction < 0)
{
fprintf(stderr, "Usage: stuffy.out [OPTION] [ARCHIVE] [FILE]");
exit(1);
}
// Perform action based on argument
StuffyAction(argv, archiveAction);
// Check for redirection
// If redirection, then perform redirection
return;
}
// Checks for argument, if argument is found then returns argument number.
// Returns -1 if not found
int StuffyArgument(int argc, char* argv[])
{
for (int i = 1; i < argc; i++)
@@ -38,6 +77,7 @@ int StuffyArgument(int argc, char* argv[])
return -1;
}
// Redirects program to necessary action function
void StuffyAction(char* argv[], int archiveAction)
{
if (archiveAction == 0)
@@ -50,83 +90,102 @@ void StuffyAction(char* argv[], int archiveAction)
ExtractArchive(argv);
}
int IsFileArchived(int archiveFile, char* fileName)
// Checks if filename is found in a header of archive
int IsFileArchived(char* archiveName, char* filename)
{
ssize_t readSize;
ModuleStruct module;
long long int moduleSize;
HeaderStruct moduleHeader;
readSize = read(archiveFile, &moduleHeader, sizeof(HeaderStruct));
if (!strcmp(moduleHeader.moduleName, fileName))
return 1;
while (readSize > 0)
ssize_t readSize;
char* newFilename = StripFilename(filename);
int archiveFile = open(archiveName, O_RDONLY | O_CREAT, 0644);
SafetyCheck((archiveFile < 0), "Archive failed to open.");
do
{
moduleSize = (long long) moduleHeader.moduleInfo.st_size;
char moduleData[moduleSize];
readSize = read(archiveFile, &moduleData, moduleSize);
readSize = read(archiveFile, &moduleHeader, sizeof(HeaderStruct));
if (!strcmp(moduleHeader.moduleName, fileName))
readSize = ReadSingleModule(archiveFile, &(module));
printf("Size of data: %ld", sizeof(module.moduleData));
free(module.moduleData);
printf("%s\n", newFilename);
if (!strcmp(module.moduleHeader.moduleName, filename))
{
free(newFilename);
close(archiveFile);
return 1;
}
}
} while (readSize > 0);
free(newFilename);
close(archiveFile);
return 0;
}
void AddToArchive(char* archiveName, char* fileName)
// Check through archive for file, if in archive then inform user
// Adds file to archive and can be repeatedly used to add more to the archive
// If file is already in archive, then exit, let user know, and suggest removing
// file already inside the archive
void AddToArchive(char* archiveName, char* filename)
{
SafetyCheck(IsFileArchived(archiveName, filename),
"File already exists in archive, try removing file first.");
int archiveFile = open(archiveName, O_RDWR | O_CREAT, 0644);
if (archiveFile < 0)
{
fprintf(stderr, "%s failed to open.\n", archiveName);
exit(1);
}
if (IsFileArchived(archiveFile, fileName))
{
fprintf(stderr, "File already exists\n");
exit(1);
}
HeaderStruct newModuleHeader;
strcpy(newModuleHeader.moduleName, fileName);
stat(fileName, &(newModuleHeader.moduleInfo));
write(archiveFile, &newModuleHeader, sizeof(newModuleHeader));
long long int newModuleSize = (long long) newModuleHeader.moduleInfo.st_size;
char newModuleData[newModuleSize];
write(archiveFile, newModuleData, newModuleSize);
SafetyCheck((archiveFile < 0), "Archive failed to open.");
ssize_t readSize;
long long int moduleSize;
ModuleStruct module;
readSize = read(archiveFile, &module.moduleHeader, sizeof(module.moduleHeader));
do
readSize = ReadSingleModule(archiveFile, &(module));
while (readSize > 0);
char* newFilename = StripFilename(filename);
strcpy(module.moduleHeader.moduleName, newFilename);
stat(filename, &(module.moduleHeader.moduleInfo));
write(archiveFile, &module.moduleHeader, sizeof(module.moduleHeader));
moduleSize = (long long) module.moduleHeader.moduleInfo.st_size;
char moduleData[moduleSize];
write(archiveFile, moduleData, moduleSize);
close(archiveFile);
free(newFilename);
free(module.moduleData);
return;
}
void RemoveFromArchive(char* archiveName, char* fileName)
// Check through archive for file, if file exists with name, remove it
// If file not in archive, print "somefile was not found."
void RemoveFromArchive(char* archiveName, char* filename)
{
ssize_t readSize;
long long int moduleSize;
char* newFileName;
strcpy(newFileName, filename);
strcat(newFileName, ".tmp");
int archiveFile = open(archiveName, O_RDWR | O_CREAT, 0644);
if (archiveFile < 0)
SafetyCheck((archiveFile < 0), "Archive failed to open.");
SafetyCheck(IsFileArchived(archiveName, filename),
strcat("Failed to find ", newFileName));
ModuleStruct module;
int newArchiveFile = open(newFileName, O_WRONLY | O_CREAT, 0644);
SafetyCheck((newArchiveFile < 0), "New archive failed to open.");
do
{
fprintf(stderr, "%s failed to open.\n", archiveName);
exit(1);
}
if (!IsFileArchived(archiveFile, fileName))
{
fprintf(stderr, "File not found.\n");
exit(1);
}
HeaderStruct moduleHeader;
readSize = read(archiveFile, &moduleHeader, sizeof(moduleHeader));
while (readSize > 0)
{
;
readSize = ReadSingleModule(archiveFile, &(module));
write(newArchiveFile, &module.moduleHeader, sizeof(module.moduleHeader));
write(newArchiveFile, &module.moduleData, moduleSize);
}
while (readSize > 0);
close(archiveFile);
close(newArchiveFile);
SafetyCheck(remove(archiveName), "Old archive failed removal.");
SafetyCheck(rename(newFileName, archiveName),
"New archive failed name change.");
return;
}
// List names and sizes of files stored in archive
// Last line prints total size of all files in archive
void ListArchive(char* archiveName)
{
int archiveFile = open(archiveName, O_RDONLY);
ssize_t readSize;
long long int moduleSize;
if (archiveFile < 0)
{
fprintf(stderr, "%s does not exist.\n", archiveName);
exit(1);
}
SafetyCheck((archiveFile < 0), "Archive failed to open.");
HeaderStruct moduleHeader;
readSize = read(archiveFile, &moduleHeader, sizeof(moduleHeader));
while (readSize > 0)
@@ -140,6 +199,8 @@ void ListArchive(char* archiveName)
return;
}
// Extract data of name file from archive to stdout, which is then redirected
// Extracted data remains in archive
void ExtractArchive(char* argv[])
{
;