From 85e36aab1258d8d9ec7b61ce013f167ef8e03ae0 Mon Sep 17 00:00:00 2001 From: David Oberhollenzer Date: Thu, 5 Mar 2020 22:38:15 +0100 Subject: Change the signature of sqfs_compressor_create to return an error code Make sure the function has a way of telling the caller *why* it failed. This way, the function can convey whether it had an internal error, an allocation failure, whether the arguments are totaly nonsensical, or simply that the compressor *or specific configuration* is not supported. Signed-off-by: David Oberhollenzer --- lib/sqfs/comp/compressor.c | 23 +++++++++++++++-------- lib/sqfs/comp/gzip.c | 16 +++++++++------- lib/sqfs/comp/internal.h | 15 ++++++++++----- lib/sqfs/comp/lz4.c | 11 +++++++---- lib/sqfs/comp/lzma.c | 11 +++++++---- lib/sqfs/comp/xz.c | 13 ++++++++----- lib/sqfs/comp/zstd.c | 15 +++++++++------ 7 files changed, 65 insertions(+), 39 deletions(-) (limited to 'lib/sqfs/comp') diff --git a/lib/sqfs/comp/compressor.c b/lib/sqfs/comp/compressor.c index 28de2c5..3b48030 100644 --- a/lib/sqfs/comp/compressor.c +++ b/lib/sqfs/comp/compressor.c @@ -12,8 +12,8 @@ #include "internal.h" -typedef sqfs_compressor_t *(*compressor_fun_t) - (const sqfs_compressor_config_t *cfg); +typedef int (*compressor_fun_t)(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out); static compressor_fun_t compressors[SQFS_COMP_MAX + 1] = { #ifdef WITH_GZIP @@ -81,17 +81,24 @@ bool sqfs_compressor_exists(SQFS_COMPRESSOR id) return (compressors[id] != NULL); } -sqfs_compressor_t *sqfs_compressor_create(const sqfs_compressor_config_t *cfg) +int sqfs_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out) { sqfs_u8 padd0[sizeof(cfg->opt)]; int ret; - if (cfg == NULL || cfg->id < SQFS_COMP_MIN || cfg->id > SQFS_COMP_MAX) - return NULL; + /* check compressor ID */ + if (cfg == NULL) + return SQFS_ERROR_ARG_INVALID; + + if (cfg->id < SQFS_COMP_MIN || cfg->id > SQFS_COMP_MAX) + return SQFS_ERROR_UNSUPPORTED; if (compressors[cfg->id] == NULL) - return NULL; + return SQFS_ERROR_UNSUPPORTED; + /* make sure the padding bytes are cleared, so we could theoretically + turn them into option fields in the future and remain compatible */ memset(padd0, 0, sizeof(padd0)); switch (cfg->id) { @@ -117,9 +124,9 @@ sqfs_compressor_t *sqfs_compressor_create(const sqfs_compressor_config_t *cfg) } if (ret != 0) - return NULL; + return SQFS_ERROR_ARG_INVALID; - return compressors[cfg->id](cfg); + return compressors[cfg->id](cfg, out); } const char *sqfs_compressor_name_from_id(SQFS_COMPRESSOR id) diff --git a/lib/sqfs/comp/gzip.c b/lib/sqfs/comp/gzip.c index 351d733..d702da1 100644 --- a/lib/sqfs/comp/gzip.c +++ b/lib/sqfs/comp/gzip.c @@ -247,7 +247,8 @@ static sqfs_object_t *gzip_create_copy(const sqfs_object_t *cmp) return (sqfs_object_t *)gzip; } -sqfs_compressor_t *gzip_compressor_create(const sqfs_compressor_config_t *cfg) +int gzip_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out) { gzip_compressor_t *gzip; sqfs_compressor_t *base; @@ -255,24 +256,24 @@ sqfs_compressor_t *gzip_compressor_create(const sqfs_compressor_config_t *cfg) if (cfg->flags & ~(SQFS_COMP_FLAG_GZIP_ALL | SQFS_COMP_FLAG_GENERIC_ALL)) { - return NULL; + return SQFS_ERROR_UNSUPPORTED; } if (cfg->opt.gzip.level < SQFS_GZIP_MIN_LEVEL || cfg->opt.gzip.level > SQFS_GZIP_MAX_LEVEL) { - return NULL; + return SQFS_ERROR_UNSUPPORTED; } if (cfg->opt.gzip.window_size < SQFS_GZIP_MIN_WINDOW || cfg->opt.gzip.window_size > SQFS_GZIP_MAX_WINDOW) { - return NULL; + return SQFS_ERROR_UNSUPPORTED; } gzip = calloc(1, sizeof(*gzip)); base = (sqfs_compressor_t *)gzip; if (gzip == NULL) - return NULL; + return SQFS_ERROR_ALLOC; gzip->opt.level = cfg->opt.gzip.level; gzip->opt.window = cfg->opt.gzip.window_size; @@ -296,8 +297,9 @@ sqfs_compressor_t *gzip_compressor_create(const sqfs_compressor_config_t *cfg) if (ret != Z_OK) { free(gzip); - return NULL; + return SQFS_ERROR_COMPRESSOR; } - return base; + *out = base; + return 0; } diff --git a/lib/sqfs/comp/internal.h b/lib/sqfs/comp/internal.h index 7518f56..0566683 100644 --- a/lib/sqfs/comp/internal.h +++ b/lib/sqfs/comp/internal.h @@ -24,18 +24,23 @@ SQFS_INTERNAL int sqfs_generic_read_options(sqfs_file_t *file, void *data, size_t size); SQFS_INTERNAL -sqfs_compressor_t *xz_compressor_create(const sqfs_compressor_config_t *cfg); +int xz_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out); SQFS_INTERNAL -sqfs_compressor_t *gzip_compressor_create(const sqfs_compressor_config_t *cfg); +int gzip_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out); SQFS_INTERNAL -sqfs_compressor_t *lz4_compressor_create(const sqfs_compressor_config_t *cfg); +int lz4_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out); SQFS_INTERNAL -sqfs_compressor_t *zstd_compressor_create(const sqfs_compressor_config_t *cfg); +int zstd_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out); SQFS_INTERNAL -sqfs_compressor_t *lzma_compressor_create(const sqfs_compressor_config_t *cfg); +int lzma_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out); #endif /* INTERNAL_H */ diff --git a/lib/sqfs/comp/lz4.c b/lib/sqfs/comp/lz4.c index 460ac44..4791746 100644 --- a/lib/sqfs/comp/lz4.c +++ b/lib/sqfs/comp/lz4.c @@ -132,20 +132,21 @@ static void lz4_destroy(sqfs_object_t *base) free(base); } -sqfs_compressor_t *lz4_compressor_create(const sqfs_compressor_config_t *cfg) +int lz4_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out) { sqfs_compressor_t *base; lz4_compressor_t *lz4; if (cfg->flags & ~(SQFS_COMP_FLAG_LZ4_ALL | SQFS_COMP_FLAG_GENERIC_ALL)) { - return NULL; + return SQFS_ERROR_UNSUPPORTED; } lz4 = calloc(1, sizeof(*lz4)); base = (sqfs_compressor_t *)lz4; if (lz4 == NULL) - return NULL; + return SQFS_ERROR_ALLOC; lz4->high_compression = (cfg->flags & SQFS_COMP_FLAG_LZ4_HC) != 0; lz4->block_size = cfg->block_size; @@ -157,5 +158,7 @@ sqfs_compressor_t *lz4_compressor_create(const sqfs_compressor_config_t *cfg) base->read_options = lz4_read_options; ((sqfs_object_t *)base)->copy = lz4_create_copy; ((sqfs_object_t *)base)->destroy = lz4_destroy; - return base; + + *out = base; + return 0; } diff --git a/lib/sqfs/comp/lzma.c b/lib/sqfs/comp/lzma.c index 51afe65..2a6cd1f 100644 --- a/lib/sqfs/comp/lzma.c +++ b/lib/sqfs/comp/lzma.c @@ -171,18 +171,19 @@ static void lzma_destroy(sqfs_object_t *base) free(base); } -sqfs_compressor_t *lzma_compressor_create(const sqfs_compressor_config_t *cfg) +int lzma_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out) { sqfs_compressor_t *base; lzma_compressor_t *lzma; if (cfg->flags & ~SQFS_COMP_FLAG_GENERIC_ALL) - return NULL; + return SQFS_ERROR_UNSUPPORTED; lzma = calloc(1, sizeof(*lzma)); base = (sqfs_compressor_t *)lzma; if (lzma == NULL) - return NULL; + return SQFS_ERROR_ALLOC; lzma->block_size = cfg->block_size; @@ -196,5 +197,7 @@ sqfs_compressor_t *lzma_compressor_create(const sqfs_compressor_config_t *cfg) base->read_options = lzma_read_options; ((sqfs_object_t *)base)->copy = lzma_create_copy; ((sqfs_object_t *)base)->destroy = lzma_destroy; - return base; + + *out = base; + return 0; } diff --git a/lib/sqfs/comp/xz.c b/lib/sqfs/comp/xz.c index 423604b..32fb032 100644 --- a/lib/sqfs/comp/xz.c +++ b/lib/sqfs/comp/xz.c @@ -227,23 +227,24 @@ static void xz_destroy(sqfs_object_t *base) free(base); } -sqfs_compressor_t *xz_compressor_create(const sqfs_compressor_config_t *cfg) +int xz_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out) { sqfs_compressor_t *base; xz_compressor_t *xz; if (cfg->flags & ~(SQFS_COMP_FLAG_GENERIC_ALL | SQFS_COMP_FLAG_XZ_ALL)) { - return NULL; + return SQFS_ERROR_UNSUPPORTED; } if (!is_dict_size_valid(cfg->opt.xz.dict_size)) - return NULL; + return SQFS_ERROR_UNSUPPORTED; xz = calloc(1, sizeof(*xz)); base = (sqfs_compressor_t *)xz; if (xz == NULL) - return NULL; + return SQFS_ERROR_ALLOC; xz->flags = cfg->flags; xz->dict_size = cfg->opt.xz.dict_size; @@ -255,5 +256,7 @@ sqfs_compressor_t *xz_compressor_create(const sqfs_compressor_config_t *cfg) base->read_options = xz_read_options; ((sqfs_object_t *)base)->copy = xz_create_copy; ((sqfs_object_t *)base)->destroy = xz_destroy; - return base; + + *out = base; + return 0; } diff --git a/lib/sqfs/comp/zstd.c b/lib/sqfs/comp/zstd.c index 12ddfdb..986c669 100644 --- a/lib/sqfs/comp/zstd.c +++ b/lib/sqfs/comp/zstd.c @@ -134,29 +134,30 @@ static void zstd_destroy(sqfs_object_t *base) free(zstd); } -sqfs_compressor_t *zstd_compressor_create(const sqfs_compressor_config_t *cfg) +int zstd_compressor_create(const sqfs_compressor_config_t *cfg, + sqfs_compressor_t **out) { zstd_compressor_t *zstd; sqfs_compressor_t *base; if (cfg->flags & ~SQFS_COMP_FLAG_GENERIC_ALL) - return NULL; + return SQFS_ERROR_UNSUPPORTED; if (cfg->opt.zstd.level < 1 || cfg->opt.zstd.level > ZSTD_maxCLevel()) { - return NULL; + return SQFS_ERROR_UNSUPPORTED; } zstd = calloc(1, sizeof(*zstd)); base = (sqfs_compressor_t *)zstd; if (zstd == NULL) - return NULL; + return SQFS_ERROR_ALLOC; zstd->block_size = cfg->block_size; zstd->zctx = ZSTD_createCCtx(); if (zstd->zctx == NULL) { free(zstd); - return NULL; + return SQFS_ERROR_COMPRESSOR; } base->get_configuration = zstd_get_configuration; @@ -166,5 +167,7 @@ sqfs_compressor_t *zstd_compressor_create(const sqfs_compressor_config_t *cfg) base->read_options = zstd_read_options; ((sqfs_object_t *)base)->copy = zstd_create_copy; ((sqfs_object_t *)base)->destroy = zstd_destroy; - return base; + + *out = base; + return 0; } -- cgit v1.2.3