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path: root/core/src/fxcodec/codec/fx_codec_flate.cpp
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Diffstat (limited to 'core/src/fxcodec/codec/fx_codec_flate.cpp')
-rw-r--r--core/src/fxcodec/codec/fx_codec_flate.cpp152
1 files changed, 73 insertions, 79 deletions
diff --git a/core/src/fxcodec/codec/fx_codec_flate.cpp b/core/src/fxcodec/codec/fx_codec_flate.cpp
index 76514bae2b..bbee167f3d 100644
--- a/core/src/fxcodec/codec/fx_codec_flate.cpp
+++ b/core/src/fxcodec/codec/fx_codec_flate.cpp
@@ -742,6 +742,7 @@ FX_DWORD CCodec_FlateScanlineDecoder::GetSrcOffset()
static void FlateUncompress(FX_LPCBYTE src_buf, FX_DWORD src_size, FX_DWORD orig_size,
FX_LPBYTE& dest_buf, FX_DWORD& dest_size, FX_DWORD& offset)
{
+ const FX_BOOL useOldImpl = src_size < 10240;
FX_DWORD guess_size = orig_size ? orig_size : src_size * 2;
FX_DWORD alloc_step = orig_size ? 10240 : (src_size < 10240 ? 10240 : src_size);
static const FX_DWORD kMaxInitialAllocSize = 10000000;
@@ -749,87 +750,88 @@ static void FlateUncompress(FX_LPCBYTE src_buf, FX_DWORD src_size, FX_DWORD orig
guess_size = kMaxInitialAllocSize;
alloc_step = kMaxInitialAllocSize;
}
+ FX_DWORD buf_size = guess_size;
+ FX_DWORD last_buf_size = buf_size;
+ void* context = nullptr;
+
FX_LPBYTE guess_buf = FX_Alloc(FX_BYTE, guess_size + 1);
- if (!guess_buf) {
- dest_buf = NULL;
- dest_size = 0;
- return;
- }
+ FX_LPBYTE cur_buf = guess_buf;
+ if (!guess_buf)
+ goto fail;
guess_buf[guess_size] = '\0';
- FX_BOOL useOldImpl = src_size < 10240;
- void* context = FPDFAPI_FlateInit(my_alloc_func, my_free_func);
- if (context == NULL) {
- dest_buf = NULL;
- dest_size = 0;
- return ;
- }
+ context = FPDFAPI_FlateInit(my_alloc_func, my_free_func);
+ if (!context)
+ goto fail;
FPDFAPI_FlateInput(context, src_buf, src_size);
- CFX_ArrayTemplate<FX_LPBYTE> result_tmp_bufs;
- FX_LPBYTE buf = guess_buf;
- FX_DWORD buf_size = guess_size;
- FX_DWORD last_buf_size = buf_size;
- while (1) {
- FX_INT32 ret = FPDFAPI_FlateOutput(context, buf, buf_size);
- FX_INT32 avail_buf_size = FPDFAPI_FlateGetAvailOut(context);
- if (!useOldImpl) {
+ if (useOldImpl) {
+ while (1) {
+ FX_INT32 ret = FPDFAPI_FlateOutput(context, cur_buf, buf_size);
+ if (ret != Z_OK)
+ break;
+ FX_INT32 avail_buf_size = FPDFAPI_FlateGetAvailOut(context);
+ if (avail_buf_size != 0)
+ break;
+
+ // |avail_buf_size| == 0 case.
+ FX_DWORD old_size = guess_size;
+ guess_size += alloc_step;
+ if (guess_size < old_size || guess_size + 1 < guess_size)
+ goto fail;
+ guess_buf = FX_Realloc(FX_BYTE, guess_buf, guess_size + 1);
+ if (!guess_buf)
+ goto fail;
+ guess_buf[guess_size] = '\0';
+ cur_buf = guess_buf + old_size;
+ buf_size = guess_size - old_size;
+ }
+ dest_size = FPDFAPI_FlateGetTotalOut(context);
+ offset = FPDFAPI_FlateGetTotalIn(context);
+ if (guess_size / 2 > dest_size) {
+ guess_buf = FX_Realloc(FX_BYTE, guess_buf, dest_size + 1);
+ if (!guess_buf)
+ goto fail;
+ guess_size = dest_size;
+ guess_buf[guess_size] = '\0';
+ }
+ dest_buf = guess_buf;
+ } else {
+ CFX_ArrayTemplate<FX_LPBYTE> result_tmp_bufs;
+ while (1) {
+ FX_INT32 ret = FPDFAPI_FlateOutput(context, cur_buf, buf_size);
+ FX_INT32 avail_buf_size = FPDFAPI_FlateGetAvailOut(context);
if (ret != Z_OK) {
last_buf_size = buf_size - avail_buf_size;
- result_tmp_bufs.Add(buf);
+ result_tmp_bufs.Add(cur_buf);
break;
}
- if (avail_buf_size == 0) {
- result_tmp_bufs.Add(buf);
- buf = NULL;
- buf = FX_Alloc(FX_BYTE, buf_size + 1);
- if (!buf) {
- dest_buf = NULL;
- dest_size = 0;
- return;
- }
- buf[buf_size] = '\0';
- } else {
+ if (avail_buf_size != 0) {
last_buf_size = buf_size - avail_buf_size;
- result_tmp_bufs.Add(buf);
- buf = NULL;
- break;
- }
- } else {
- if (ret != Z_OK) {
+ result_tmp_bufs.Add(cur_buf);
break;
}
- if (avail_buf_size == 0) {
- FX_DWORD old_size = guess_size;
- guess_size += alloc_step;
- if (guess_size < old_size || guess_size + 1 < guess_size) {
- dest_buf = NULL;
- dest_size = 0;
- return;
- }
- guess_buf = FX_Realloc(FX_BYTE, guess_buf, guess_size + 1);
- if (!guess_buf) {
- dest_buf = NULL;
- dest_size = 0;
- return;
+
+ // |avail_buf_size| == 0 case.
+ result_tmp_bufs.Add(cur_buf);
+ cur_buf = FX_Alloc(FX_BYTE, buf_size + 1);
+ if (!cur_buf) {
+ for (FX_INT32 i = 0; i < result_tmp_bufs.GetSize(); i++) {
+ FX_Free(result_tmp_bufs[i]);
}
- guess_buf[guess_size] = '\0';
- buf = guess_buf + old_size;
- buf_size = guess_size - old_size;
- } else {
- break;
+ goto fail;
}
+ cur_buf[buf_size] = '\0';
}
- }
- dest_size = FPDFAPI_FlateGetTotalOut(context);
- offset = FPDFAPI_FlateGetTotalIn(context);
- if (!useOldImpl) {
+ dest_size = FPDFAPI_FlateGetTotalOut(context);
+ offset = FPDFAPI_FlateGetTotalIn(context);
if (result_tmp_bufs.GetSize() == 1) {
dest_buf = result_tmp_bufs[0];
} else {
FX_LPBYTE result_buf = FX_Alloc(FX_BYTE, dest_size);
if (!result_buf) {
- dest_buf = NULL;
- dest_size = 0;
- return;
+ for (FX_INT32 i = 0; i < result_tmp_bufs.GetSize(); i++) {
+ FX_Free(result_tmp_bufs[i]);
+ }
+ goto fail;
}
FX_DWORD result_pos = 0;
for (FX_INT32 i = 0; i < result_tmp_bufs.GetSize(); i++) {
@@ -840,27 +842,19 @@ static void FlateUncompress(FX_LPCBYTE src_buf, FX_DWORD src_size, FX_DWORD orig
}
FXSYS_memcpy32(result_buf + result_pos, tmp_buf, tmp_buf_size);
result_pos += tmp_buf_size;
- FX_Free(tmp_buf);
- tmp_buf = NULL;
- result_tmp_bufs[i] = NULL;
+ FX_Free(result_tmp_bufs[i]);
}
dest_buf = result_buf;
}
- } else {
- if (guess_size / 2 > dest_size) {
- guess_buf = FX_Realloc(FX_BYTE, guess_buf, dest_size + 1);
- if (!guess_buf) {
- dest_buf = NULL;
- dest_size = 0;
- return;
- }
- guess_size = dest_size;
- guess_buf[guess_size] = '\0';
- }
- dest_buf = guess_buf;
}
FPDFAPI_FlateEnd(context);
- context = NULL;
+ return;
+
+fail:
+ FX_Free(guess_buf);
+ dest_buf = nullptr;
+ dest_size = 0;
+ return;
}
ICodec_ScanlineDecoder* CCodec_FlateModule::CreateDecoder(FX_LPCBYTE src_buf, FX_DWORD src_size, int width, int height,
int nComps, int bpc, int predictor, int Colors, int BitsPerComponent, int Columns)
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-02 13:28:25 +0000