303 lines
8.7 KiB
C
303 lines
8.7 KiB
C
/*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#ifndef ZIP_H
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#define ZIP_H
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#include <string.h>
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#include <sys/types.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(_SSIZE_T_DEFINED) && !defined(_SSIZE_T_DEFINED_) && \
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!defined(_SSIZE_T) && !defined(_SSIZE_T_) && !defined(__ssize_t_defined)
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#define _SSIZE_T
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// 64-bit Windows is the only mainstream platform
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// where sizeof(long) != sizeof(void*)
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#ifdef _WIN64
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typedef long long ssize_t; /* byte count or error */
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#else
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typedef long ssize_t; /* byte count or error */
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#endif
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#endif
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#ifndef MAX_PATH
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#define MAX_PATH 32767 /* # chars in a path name including NULL */
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#endif
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/**
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* @mainpage
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*
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* Documenation for @ref zip.
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*/
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/**
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* @addtogroup zip
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* @{
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*/
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/**
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* Default zip compression level.
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*/
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#define ZIP_DEFAULT_COMPRESSION_LEVEL 6
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/**
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* @struct zip_t
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*
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* This data structure is used throughout the library to represent zip archive -
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* forward declaration.
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*/
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struct zip_t;
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/**
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* Opens zip archive with compression level using the given mode.
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*
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* @param zipname zip archive file name.
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* @param level compression level (0-9 are the standard zlib-style levels).
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* @param mode file access mode.
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* - 'r': opens a file for reading/extracting (the file must exists).
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* - 'w': creates an empty file for writing.
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* - 'a': appends to an existing archive.
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*
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* @return the zip archive handler or NULL on error
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*/
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extern struct zip_t *zip_open(const char *zipname, int level, char mode);
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/**
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* Closes the zip archive, releases resources - always finalize.
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*
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* @param zip zip archive handler.
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*/
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extern void zip_close(struct zip_t *zip);
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/**
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* Opens an entry by name in the zip archive.
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*
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* For zip archive opened in 'w' or 'a' mode the function will append
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* a new entry. In readonly mode the function tries to locate the entry
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* in global dictionary.
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*
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* @param zip zip archive handler.
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* @param entryname an entry name in local dictionary.
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int zip_entry_open(struct zip_t *zip, const char *entryname);
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/**
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* Opens a new entry by index in the zip archive.
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*
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* This function is only valid if zip archive was opened in 'r' (readonly) mode.
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*
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* @param zip zip archive handler.
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* @param index index in local dictionary.
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int zip_entry_openbyindex(struct zip_t *zip, int index);
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/**
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* Closes a zip entry, flushes buffer and releases resources.
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*
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* @param zip zip archive handler.
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int zip_entry_close(struct zip_t *zip);
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/**
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* Returns a local name of the current zip entry.
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*
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* The main difference between user's entry name and local entry name
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* is optional relative path.
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* Following .ZIP File Format Specification - the path stored MUST not contain
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* a drive or device letter, or a leading slash.
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* All slashes MUST be forward slashes '/' as opposed to backwards slashes '\'
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* for compatibility with Amiga and UNIX file systems etc.
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*
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* @param zip: zip archive handler.
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*
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* @return the pointer to the current zip entry name, or NULL on error.
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*/
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extern const char *zip_entry_name(struct zip_t *zip);
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/**
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* Returns an index of the current zip entry.
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*
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* @param zip zip archive handler.
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*
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* @return the index on success, negative number (< 0) on error.
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*/
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extern int zip_entry_index(struct zip_t *zip);
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/**
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* Determines if the current zip entry is a directory entry.
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*
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* @param zip zip archive handler.
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*
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* @return the return code - 1 (true), 0 (false), negative number (< 0) on
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* error.
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*/
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extern int zip_entry_isdir(struct zip_t *zip);
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/**
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* Returns an uncompressed size of the current zip entry.
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*
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* @param zip zip archive handler.
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*
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* @return the uncompressed size in bytes.
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*/
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extern unsigned long long zip_entry_size(struct zip_t *zip);
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/**
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* Returns CRC-32 checksum of the current zip entry.
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*
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* @param zip zip archive handler.
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*
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* @return the CRC-32 checksum.
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*/
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extern unsigned int zip_entry_crc32(struct zip_t *zip);
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/**
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* Compresses an input buffer for the current zip entry.
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*
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* @param zip zip archive handler.
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* @param buf input buffer.
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* @param bufsize input buffer size (in bytes).
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int zip_entry_write(struct zip_t *zip, const void *buf, size_t bufsize);
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/**
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* Compresses a file for the current zip entry.
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*
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* @param zip zip archive handler.
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* @param filename input file.
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int zip_entry_fwrite(struct zip_t *zip, const char *filename);
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/**
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* Extracts the current zip entry into output buffer.
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*
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* The function allocates sufficient memory for a output buffer.
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*
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* @param zip zip archive handler.
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* @param buf output buffer.
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* @param bufsize output buffer size (in bytes).
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*
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* @note remember to release memory allocated for a output buffer.
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* for large entries, please take a look at zip_entry_extract function.
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*
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* @return the return code - the number of bytes actually read on success.
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* Otherwise a -1 on error.
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*/
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extern ssize_t zip_entry_read(struct zip_t *zip, void **buf, size_t *bufsize);
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/**
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* Extracts the current zip entry into a memory buffer using no memory
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* allocation.
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*
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* @param zip zip archive handler.
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* @param buf preallocated output buffer.
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* @param bufsize output buffer size (in bytes).
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*
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* @note ensure supplied output buffer is large enough.
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* zip_entry_size function (returns uncompressed size for the current
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* entry) can be handy to estimate how big buffer is needed. for large
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* entries, please take a look at zip_entry_extract function.
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*
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* @return the return code - the number of bytes actually read on success.
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* Otherwise a -1 on error (e.g. bufsize is not large enough).
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*/
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extern ssize_t zip_entry_noallocread(struct zip_t *zip, void *buf,
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size_t bufsize);
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/**
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* Extracts the current zip entry into output file.
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*
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* @param zip zip archive handler.
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* @param filename output file.
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int zip_entry_fread(struct zip_t *zip, const char *filename);
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/**
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* Extracts the current zip entry using a callback function (on_extract).
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*
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* @param zip zip archive handler.
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* @param on_extract callback function.
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* @param arg opaque pointer (optional argument, which you can pass to the
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* on_extract callback)
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int
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zip_entry_extract(struct zip_t *zip,
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size_t (*on_extract)(void *arg, unsigned long long offset,
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const void *data, size_t size),
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void *arg);
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/**
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* Returns the number of all entries (files and directories) in the zip archive.
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*
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* @param zip zip archive handler.
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*
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* @return the return code - the number of entries on success, negative number
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* (< 0) on error.
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*/
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extern int zip_total_entries(struct zip_t *zip);
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/**
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* Creates a new archive and puts files into a single zip archive.
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*
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* @param zipname zip archive file.
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* @param filenames input files.
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* @param len: number of input files.
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int zip_create(const char *zipname, const char *filenames[], size_t len);
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/**
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* Extracts a zip archive file into directory.
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*
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* If on_extract_entry is not NULL, the callback will be called after
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* successfully extracted each zip entry.
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* Returning a negative value from the callback will cause abort and return an
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* error. The last argument (void *arg) is optional, which you can use to pass
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* data to the on_extract_entry callback.
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*
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* @param zipname zip archive file.
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* @param dir output directory.
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* @param on_extract_entry on extract callback.
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* @param arg opaque pointer.
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*
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* @return the return code - 0 on success, negative number (< 0) on error.
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*/
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extern int zip_extract(const char *zipname, const char *dir,
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int (*on_extract_entry)(const char *filename, void *arg),
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void *arg);
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif
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