zip_source_file_common.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "zipint.h"
#include "zip_source_file.h"

Go to the source code of this file.

Functions
static zip_int64_t	read_file (void *state, void *data, zip_uint64_t len, zip_source_cmd_t cmd)
static void	zip_source_file_stat_init (zip_source_file_stat_t *st)
zip_source_t *	zip_source_file_common_new (const char *fname, void *file, zip_uint64_t start, zip_int64_t len, const zip_stat_t *st, zip_source_file_operations_t *ops, void *ops_userdata, zip_error_t *error)

Function Documentation

read_file()

static zip_int64_t read_file ( void *  state, void *  data, zip_uint64_t  len, zip_source_cmd_t  cmd  )

static

Definition at line 204 of file zip_source_file_common.c.

                                                                           {
    zip_source_file_context_t *ctx;
    char *buf;
 
    ctx = (zip_source_file_context_t *)state;
    buf = (char *)data;
 
    switch (cmd) {
    case ZIP_SOURCE_ACCEPT_EMPTY:
        return 0;
 
    case ZIP_SOURCE_BEGIN_WRITE:
        /* write support should not be set if fname is NULL */
        if (ctx->fname == NULL) {
            zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
            return -1;
        }
        return ctx->ops->create_temp_output(ctx);
 
    case ZIP_SOURCE_BEGIN_WRITE_CLONING:
        /* write support should not be set if fname is NULL */
        if (ctx->fname == NULL) {
            zip_error_set(&ctx->error, ZIP_ER_INTERNAL, 0);
            return -1;
        }
        return ctx->ops->create_temp_output_cloning(ctx, len);
 
    case ZIP_SOURCE_CLOSE:
        if (ctx->fname) {
            ctx->ops->close(ctx);
            ctx->f = NULL;
        }
        return 0;
 
    case ZIP_SOURCE_COMMIT_WRITE: {
        zip_int64_t ret = ctx->ops->commit_write(ctx);
        ctx->fout = NULL;
        if (ret == 0) {
            free(ctx->tmpname);
            ctx->tmpname = NULL;
        }
        return ret;
    }
 
    case ZIP_SOURCE_ERROR:
        return zip_error_to_data(&ctx->error, data, len);
 
    case ZIP_SOURCE_FREE:
        free(ctx->fname);
        free(ctx->tmpname);
        if (ctx->f) {
            ctx->ops->close(ctx);
        }
        free(ctx);
        return 0;
 
    case ZIP_SOURCE_GET_FILE_ATTRIBUTES:
        if (len < sizeof(ctx->attributes)) {
            zip_error_set(&ctx->error, ZIP_ER_INVAL, 0);
            return -1;
        }
        memcpy(data, &ctx->attributes, sizeof(ctx->attributes));
        return sizeof(ctx->attributes);
 
    case ZIP_SOURCE_OPEN:
        if (ctx->fname) {
            if (ctx->ops->open(ctx) == false) {
                return -1;
            }
        }
 
        if (ctx->start > 0) { // TODO: rewind on re-open
            if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)ctx->start, SEEK_SET) == false) {
                /* TODO: skip by reading */
                return -1;
            }
        }
        ctx->offset = 0;
        return 0;
 
    case ZIP_SOURCE_READ: {
        zip_int64_t i;
        zip_uint64_t n;
 
        if (ctx->len > 0) {
            n = ZIP_MIN(ctx->len - ctx->offset, len);
        }
        else {
            n = len;
        }
 
        if ((i = ctx->ops->read(ctx, buf, n)) < 0) {
            zip_error_set(&ctx->error, ZIP_ER_READ, errno);
            return -1;
        }
        ctx->offset += (zip_uint64_t)i;
 
        return i;
    }
 
    case ZIP_SOURCE_REMOVE:
        return ctx->ops->remove(ctx);
 
    case ZIP_SOURCE_ROLLBACK_WRITE:
        ctx->ops->rollback_write(ctx);
        ctx->fout = NULL;
        free(ctx->tmpname);
        ctx->tmpname = NULL;
        return 0;
 
    case ZIP_SOURCE_SEEK: {
        zip_int64_t new_offset = zip_source_seek_compute_offset(ctx->offset, ctx->len, data, len, &ctx->error);
 
        if (new_offset < 0) {
            return -1;
        }
 
        /* The actual offset inside the file must be representable as zip_int64_t. */
        if (new_offset > ZIP_INT64_MAX - (zip_int64_t)ctx->start) {
            zip_error_set(&ctx->error, ZIP_ER_SEEK, EOVERFLOW);
            return -1;
        }
 
        ctx->offset = (zip_uint64_t)new_offset;
 
        if (ctx->ops->seek(ctx, ctx->f, (zip_int64_t)(ctx->offset + ctx->start), SEEK_SET) == false) {
            return -1;
        }
        return 0;
    }
 
    case ZIP_SOURCE_SEEK_WRITE: {
        zip_source_args_seek_t *args;
 
        args = ZIP_SOURCE_GET_ARGS(zip_source_args_seek_t, data, len, &ctx->error);
        if (args == NULL) {
            return -1;
        }
 
        if (ctx->ops->seek(ctx, ctx->fout, args->offset, args->whence) == false) {
            return -1;
        }
        return 0;
    }
 
    case ZIP_SOURCE_STAT: {
        if (len < sizeof(ctx->st))
            return -1;
 
        if (zip_error_code_zip(&ctx->stat_error) != 0) {
            zip_error_set(&ctx->error, zip_error_code_zip(&ctx->stat_error), zip_error_code_system(&ctx->stat_error));
            return -1;
        }
 
        memcpy(data, &ctx->st, sizeof(ctx->st));
        return sizeof(ctx->st);
    }
 
    case ZIP_SOURCE_SUPPORTS:
        return ctx->supports;
 
    case ZIP_SOURCE_TELL:
        return (zip_int64_t)ctx->offset;
 
    case ZIP_SOURCE_TELL_WRITE:
        return ctx->ops->tell(ctx, ctx->fout);
 
    case ZIP_SOURCE_WRITE:
        return ctx->ops->write(ctx, data, len);
 
    default:
        zip_error_set(&ctx->error, ZIP_ER_OPNOTSUPP, 0);
        return -1;
    }
}

References args, cmd, EOVERFLOW, ctx::error, free(), i, len, memcpy(), n, NULL, SEEK_SET, ZIP_ER_INTERNAL, ZIP_ER_INVAL, ZIP_ER_OPNOTSUPP, ZIP_ER_READ, ZIP_ER_SEEK, zip_error_code_system(), zip_error_code_zip(), zip_error_set(), zip_error_to_data(), ZIP_INT64_MAX, ZIP_MIN, ZIP_SOURCE_ACCEPT_EMPTY, ZIP_SOURCE_BEGIN_WRITE, ZIP_SOURCE_BEGIN_WRITE_CLONING, ZIP_SOURCE_CLOSE, ZIP_SOURCE_COMMIT_WRITE, ZIP_SOURCE_ERROR, ZIP_SOURCE_FREE, ZIP_SOURCE_GET_ARGS, ZIP_SOURCE_GET_FILE_ATTRIBUTES, ZIP_SOURCE_OPEN, ZIP_SOURCE_READ, ZIP_SOURCE_REMOVE, ZIP_SOURCE_ROLLBACK_WRITE, ZIP_SOURCE_SEEK, zip_source_seek_compute_offset(), ZIP_SOURCE_SEEK_WRITE, ZIP_SOURCE_STAT, ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, ZIP_SOURCE_TELL_WRITE, and ZIP_SOURCE_WRITE.

Referenced by zip_source_file_common_new().

zip_source_file_common_new()

zip_source_t* zip_source_file_common_new	(	const char *	fname,
		void *	file,
		zip_uint64_t	start,
		zip_int64_t	len,
		const zip_stat_t *	st,
		zip_source_file_operations_t *	ops,
		void *	ops_userdata,
		zip_error_t *	error
	)

Definition at line 53 of file zip_source_file_common.c.

                                                                                                                                                                                                {
    zip_source_file_context_t *ctx;
    zip_source_t *zs;
    zip_source_file_stat_t sb;
 
    if (ops == NULL) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }
 
    if (ops->close == NULL || ops->read == NULL || ops->seek == NULL || ops->stat == NULL) {
        zip_error_set(error, ZIP_ER_INTERNAL, 0);
        return NULL;
    }
 
    if (ops->write != NULL && (ops->commit_write == NULL || ops->create_temp_output == NULL || ops->remove == NULL || ops->rollback_write == NULL || ops->tell == NULL)) {
        zip_error_set(error, ZIP_ER_INTERNAL, 0);
        return NULL;
    }
 
    if (fname != NULL) {
        if (ops->open == NULL || ops->string_duplicate == NULL) {
            zip_error_set(error, ZIP_ER_INTERNAL, 0);
            return NULL;
        }
    }
    else if (file == NULL) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }
 
    if (len < 0) {
        len = 0;
    }
 
    if (start > ZIP_INT64_MAX || start + (zip_uint64_t)len < start) {
        zip_error_set(error, ZIP_ER_INVAL, 0);
        return NULL;
    }
 
    if ((ctx = (zip_source_file_context_t *)malloc(sizeof(zip_source_file_context_t))) == NULL) {
        zip_error_set(error, ZIP_ER_MEMORY, 0);
        return NULL;
    }
 
    ctx->ops = ops;
    ctx->ops_userdata = ops_userdata;
    ctx->fname = NULL;
    if (fname) {
        if ((ctx->fname = ops->string_duplicate(ctx, fname)) == NULL) {
            zip_error_set(error, ZIP_ER_MEMORY, 0);
            free(ctx);
            return NULL;
        }
    }
    ctx->f = file;
    ctx->start = start;
    ctx->len = (zip_uint64_t)len;
    if (st) {
        memcpy(&ctx->st, st, sizeof(ctx->st));
        ctx->st.name = NULL;
        ctx->st.valid &= ~ZIP_STAT_NAME;
    }
    else {
        zip_stat_init(&ctx->st);
    }
 
    if (ctx->len > 0) {
        ctx->st.size = ctx->len;
        ctx->st.valid |= ZIP_STAT_SIZE;
    }
 
    zip_error_init(&ctx->stat_error);
 
    ctx->tmpname = NULL;
    ctx->fout = NULL;
 
    zip_error_init(&ctx->error);
    zip_file_attributes_init(&ctx->attributes);
 
    ctx->supports = ZIP_SOURCE_SUPPORTS_READABLE | zip_source_make_command_bitmap(ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_TELL, -1);
 
    zip_source_file_stat_init(&sb);
    if (!ops->stat(ctx, &sb)) {
        _zip_error_copy(error, &ctx->error);
        free(ctx->fname);
        free(ctx);
        return NULL;
    }
 
    if (!sb.exists) {
        if (ctx->fname && ctx->start == 0 && ctx->len == 0 && ops->write != NULL) {
            ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
            /* zip_open_from_source checks for this to detect non-existing files */
            zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
        }
        else {
            zip_error_set(&ctx->stat_error, ZIP_ER_READ, ENOENT);
            free(ctx->fname);
            free(ctx);
            return NULL;
        }
    }
    else {
        if ((ctx->st.valid & ZIP_STAT_MTIME) == 0) {
            ctx->st.mtime = sb.mtime;
            ctx->st.valid |= ZIP_STAT_MTIME;
        }
        if (sb.regular_file) {
            ctx->supports = ZIP_SOURCE_SUPPORTS_SEEKABLE;
 
            if (ctx->start + ctx->len > sb.size) {
                zip_error_set(error, ZIP_ER_INVAL, 0);
                free(ctx->fname);
                free(ctx);
                return NULL;
            }
 
            if (ctx->len == 0) {
                ctx->len = sb.size - ctx->start;
                ctx->st.size = ctx->len;
                ctx->st.valid |= ZIP_STAT_SIZE;
 
                /* when using a partial file, don't allow writing */
                if (ctx->fname && start == 0 && ops->write != NULL) {
                    ctx->supports = ZIP_SOURCE_SUPPORTS_WRITABLE;
                }
            }
        }
 
        ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_GET_FILE_ATTRIBUTES);
    }
 
    ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_ACCEPT_EMPTY);
    if (ops->create_temp_output_cloning != NULL) {
        if (ctx->supports & ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE)) {
            ctx->supports |= ZIP_SOURCE_MAKE_COMMAND_BITMASK(ZIP_SOURCE_BEGIN_WRITE_CLONING);
        }
    }
 
    if ((zs = zip_source_function_create(read_file, ctx, error)) == NULL) {
        free(ctx->fname);
        free(ctx);
        return NULL;
    }
 
    return zs;
}

References _zip_error_copy(), ENOENT, ctx::error, error(), file, create_tags_rz::fname, free(), len, malloc(), memcpy(), NULL, ops, read_file(), sb, start, ZIP_ER_INTERNAL, ZIP_ER_INVAL, ZIP_ER_MEMORY, ZIP_ER_READ, zip_error_init(), zip_error_set(), zip_file_attributes_init(), ZIP_INT64_MAX, ZIP_SOURCE_ACCEPT_EMPTY, ZIP_SOURCE_BEGIN_WRITE, ZIP_SOURCE_BEGIN_WRITE_CLONING, zip_source_file_stat_init(), zip_source_function_create(), ZIP_SOURCE_GET_FILE_ATTRIBUTES, zip_source_make_command_bitmap(), ZIP_SOURCE_MAKE_COMMAND_BITMASK, ZIP_SOURCE_SUPPORTS, ZIP_SOURCE_SUPPORTS_READABLE, ZIP_SOURCE_SUPPORTS_SEEKABLE, ZIP_SOURCE_SUPPORTS_WRITABLE, ZIP_SOURCE_TELL, zip_stat_init(), ZIP_STAT_MTIME, ZIP_STAT_NAME, and ZIP_STAT_SIZE.

Referenced by zip_source_file_create(), zip_source_filep_create(), zip_source_win32a_create(), zip_source_win32handle_create(), and zip_source_win32w_create().

zip_source_file_stat_init()

static void zip_source_file_stat_init ( zip_source_file_stat_t *  st )

static

Definition at line 45 of file zip_source_file_common.c.

                                                      {
    st->size = 0;
    st->mtime = time(NULL);
    st->exists = false;
    st->regular_file = false;
}

References zip_source_file_stat::exists, zip_source_file_stat::mtime, NULL, zip_source_file_stat::regular_file, zip_source_file_stat::size, and time.

Referenced by zip_source_file_common_new().