pak_pack.c

#include "pak_pack.h"
bool pakUnpack(uint8_t *buffer, char *outputPath) {
    MyPakHeader myHeader;
    if (!pakParseHeader(buffer, &myHeader)) {
        return false;
    }
    PakFile *files = pakGetFiles(buffer);
    if (files == NULL) {
        return false;
    }

    char fileNameBuf[FILENAME_MAX];
    memset(fileNameBuf, 0, FILENAME_MAX);
    char pathBuf[PATH_MAX + 2];
    memset(pathBuf, 0, PATH_MAX);

#ifdef _WIN32
    CreateDirectory(outputPath, NULL);
#else
    mkdir(outputPath, 0777);
#endif
    char *pakIndexStr = calloc(PAK_BUFFER_BLOCK_SIZE, sizeof(char));
    if (pakIndexStr == NULL) {
        free(files);
        return false;
    }
    uint32_t offset = 0;
    uint32_t length = PAK_BUFFER_BLOCK_SIZE;
    offset +=
        sprintf(pakIndexStr + offset, PAK_INDEX_GLOBAL_TAG "\r\nversion=%u\r\n",
                myHeader.version);
    offset += sprintf(pakIndexStr + offset,
                      "encoding=%u\r\n\r\n" PAK_INDEX_RES_TAG "\r\n",
                      myHeader.encoding);
    for (uint32_t i = 0; i < myHeader.resource_count; i++) {
        sprintf(fileNameBuf, "%u%s", files[i].id, pakGetFileType(files[i]));
        offset += sprintf(pakIndexStr + offset, "%u=%s\r\n", files[i].id,
                          fileNameBuf);
        if (length - offset < PAK_BUFFER_MIN_FREE_SIZE) {
            pakIndexStr = realloc(pakIndexStr, length + PAK_BUFFER_BLOCK_SIZE);
            length += PAK_BUFFER_BLOCK_SIZE;
        }
        sprintf(pathBuf, "%s/%s", outputPath, fileNameBuf);
        writeFile(pathBuf, files[i]);
    }
    PakAlias *aliasBuf = NULL;
    if (myHeader.alias_count > 0) {
        offset +=
            sprintf(pakIndexStr + offset, "\r\n" PAK_INDEX_ALIAS_TAG "\r\n");
        aliasBuf = (PakAlias *)(buffer + myHeader.size +
                                (myHeader.resource_count + 1) * PAK_ENTRY_SIZE);
    }
    for (unsigned int i = 0; i < myHeader.alias_count; i++) {
        offset += sprintf(pakIndexStr + offset, "%u=%u\r\n",
                          aliasBuf->resource_id, aliasBuf->entry_index);
        aliasBuf++;
        if (length - offset < PAK_BUFFER_MIN_FREE_SIZE) {
            pakIndexStr = realloc(pakIndexStr, length + PAK_BUFFER_BLOCK_SIZE);
            length += PAK_BUFFER_BLOCK_SIZE;
        }
    }
    PakFile pakIndexBuf;
    // puts(pakIndexStr);
    pakIndexBuf.buffer = pakIndexStr;
    pakIndexBuf.size = offset;
    sprintf(pathBuf, "%s/pak_index.ini", outputPath);
    writeFile(pathBuf, pakIndexBuf);
    freeFile(pakIndexBuf);
    free(files);
    return true;
}

uint32_t countChar(const char *string, uint32_t length, char toCount) {
    uint32_t count = 0;
    for (uint32_t i = 0; i < length; i++) {
        if (string[i] == toCount)
            count++;
    }
    return count;
}

PakFile pakPack(PakFile pakIndex, char *path) { // TODO
    MyPakHeader myHeader;
    memset(&myHeader, 0, sizeof(myHeader));
    char *pakIndexBuf = pakIndex.buffer;

    PakFile pakFile = NULL_File;
    PakFile *resFiles = NULL;
    PakAlias *pakAlias = NULL;

    uint32_t count = 0;
    uint32_t offset = sizeof(PAK_INDEX_GLOBAL_TAG) - 1;
    sscanf(pakIndexBuf + offset, " version=%u%n", &myHeader.version, &count);
    if (count == 0) {
        goto PAK_PACK_END;
    }
    offset += count;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wformat"
#pragma GCC diagnostic ignored "-Wformat-extra-args"
    sscanf(pakIndexBuf + offset, " encoding=%hhu%n", &myHeader.encoding,
           &count);
#pragma GCC diagnostic pop
    //	printf("version=%u\nencoding=%u\n", myHeader.version,
    // myHeader.encoding);
    if (myHeader.version == 5) {
        myHeader.size = PAK_HEADER_SIZE_V5;
    } else if (myHeader.version == 4) {
        myHeader.size = PAK_HEADER_SIZE_V4;
    } else {
        puts(PAK_ERROR_UNKNOWN_VER);
        goto PAK_PACK_END;
    }
    char *pakIndexEnd = pakIndexBuf + pakIndex.size - 1;
    char *pakEntryIndex =
        strstr(pakIndexBuf, PAK_INDEX_RES_TAG) + sizeof(PAK_INDEX_RES_TAG) - 1;
    char *pakAliasIndex = strstr(pakIndexBuf, PAK_INDEX_ALIAS_TAG);
    if (myHeader.version == 4 || pakAliasIndex == NULL) {
        myHeader.alias_count = 0;
        pakAliasIndex = pakIndexEnd;
    } else {
        pakAliasIndex += sizeof(PAK_INDEX_ALIAS_TAG) - 1;
        myHeader.alias_count =
                (uint16_t) countChar(pakAliasIndex, pakIndexEnd - pakAliasIndex, '=');
    }
    myHeader.resource_count =
        countChar(pakEntryIndex, pakAliasIndex - pakEntryIndex, '=');

    // printf("resource_count=%u\nalias_count=%u\n", myHeader.resource_count,
    // myHeader.alias_count);

    char fileNameBuf[FILENAME_MAX];
    memset(fileNameBuf, 0, FILENAME_MAX);
    char pathBuf[PATH_MAX];
    memset(pathBuf, 0, PATH_MAX);
    resFiles = calloc(myHeader.resource_count, sizeof(PakFile));
    if (resFiles == NULL) {
        goto PAK_PACK_END;
    }

    offset = 0;
    for (uint32_t i = 0; i < myHeader.resource_count; i++) {
        uint32_t id = 0;
        sscanf(pakEntryIndex + offset, " %u=%s%n ", &id, fileNameBuf, &count);
        if (count == 0 || sprintf(pathBuf, "%s%s", path, fileNameBuf) == 0) {
            puts(PAK_ERROR_BROKEN_INDEX);
            myHeader.resource_count = i;
            goto PAK_PACK_END;
        }
        offset += count;
        resFiles[i] = readFile(pathBuf);
        if (resFiles[i].buffer == NULL) {
            puts(PAK_ERROR_BROKEN_INDEX);
            myHeader.resource_count = i;
            goto PAK_PACK_END;
        }
        resFiles[i].id = (uint16_t) id;
        //	printf("id=%u\tfile_name=%s\tpath=%s\tsize=%u\n",id,
        // fileNameBuf, pathBuf, resFiles[i].size);
    }
    if (myHeader.alias_count > 0) {
        offset = 0;
        pakAlias = calloc(myHeader.alias_count, sizeof(PakAlias));
        if (pakAlias == NULL) {
            goto PAK_PACK_END;
        }
        for (uint32_t i = 0; i < myHeader.alias_count; i++) {
            sscanf(pakAliasIndex + offset, " %hu=%hu%n ",
                   &pakAlias[i].resource_id, &pakAlias[i].entry_index, &count);
            if (count == 0) {
                puts(PAK_ERROR_BROKEN_INDEX);
                goto PAK_PACK_END;
            }
            offset += count;
            //	printf("resource_id=%hu\tentry_index=%hu\n",pakAlias[i].resource_id,
            // pakAlias[i].entry_index);
        }
    }
    pakFile = pakPackFiles(&myHeader, resFiles, pakAlias);
    printf("\nresource_count=%u\nalias_count=%u\n", myHeader.resource_count,
           myHeader.alias_count);
    printf("version=%u\nencoding=%u\n", myHeader.version, myHeader.encoding);
    printf("\npak size: %u\n", pakFile.size);
PAK_PACK_END:
    if (resFiles != NULL) {
        for (uint32_t i = 0; i < myHeader.resource_count; i++) {
            if (resFiles[i].buffer != NULL)
                free(resFiles[i].buffer);
        }
        free(resFiles);
    }
    if (pakAlias != NULL)
        free(pakAlias);
    return pakFile;
}